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Direct Pointwise Comparison of FE Predictions to StereoDIC Measurements:Developments and Validation Using Double Edge-Notched Tensile Specimen
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作者 Troy Myers Michael A.Sutton +2 位作者 Hubert Schreier Alistair Tofts Sreehari Rajan Kattil 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第8期1263-1298,共36页
To compare finite element analysis(FEA)predictions and stereovision digital image correlation(StereoDIC)strain measurements at the same spatial positions throughout a region of interest,a field comparison procedure is... To compare finite element analysis(FEA)predictions and stereovision digital image correlation(StereoDIC)strain measurements at the same spatial positions throughout a region of interest,a field comparison procedure is developed.The procedure includes(a)conversion of the finite element data into a triangular mesh,(b)selection of a common coordinate system,(c)determination of the rigid body transformation to place both measurements and FEA data in the same system and(d)interpolation of the FEA nodal information to the same spatial locations as the StereoDIC measurements using barycentric coordinates.For an aluminum Al-6061 double edge notched tensile specimen,FEA results are obtained using both the von Mises isotropic yield criterion and Hill’s quadratic anisotropic yield criterion,with the unknown Hill model parameters determined using full-field specimen strain measurements for the nominally plane stress specimen.Using Hill’s quadratic anisotropic yield criterion,the point-by-point comparison of experimentally based full-field strains and stresses to finite element predictions are shown to be in excellent agreement,confirming the effectiveness of the field comparison process. 展开更多
关键词 stereoDIC spatial co-registration data transformation finite element simulations point-wise comparison of measurements and FEA predictions double edge notch specimen model validation
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Finite Element Analysis of the Base
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作者 YANG Shulong 《International Journal of Plant Engineering and Management》 2023年第2期123-128,共6页
This paper describes the structure of the base,on which two working arms are installed simultaneously.To ensure structura safety,the fatigue failure analysis and statics analysis are finished using the finite element ... This paper describes the structure of the base,on which two working arms are installed simultaneously.To ensure structura safety,the fatigue failure analysis and statics analysis are finished using the finite element method.The calculation can make sure that the structure of the base meets the design standard,and the material can be reduced one grade. 展开更多
关键词 finite element method s⁃N curve von⁃mises stress fatigue failure
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Analysis of the geometrical dependence of auxetic behavior in reentrant structures by finite elements 被引量:5
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作者 V.H.Carneiro H.Puga J.Meireles 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第2期295-300,共6页
Materials with a negative Poisson's ratio(PR)are called auxetics;they are characterized by expansion/contraction when tensioned/compressed.Given this counterintuitive behavior,they present very particular character... Materials with a negative Poisson's ratio(PR)are called auxetics;they are characterized by expansion/contraction when tensioned/compressed.Given this counterintuitive behavior,they present very particular characteristics and mechanical behavior.Geometrical models have been developed to justify and artificiall reproduce such materials' auxetic behavior.The focus of this study is the exploration of a reentrant model by analyzing the variation in the PR of reentrant structures as a function of geometrical and base material parameters.It is shown that,even in the presence of protruding ribs,there may not be auxetic behavior,and this depends on the geometry of each reentrant structure.Values determined for these parameters can be helpful as approximate reference data in the design and fabrication of auxetic lattices using reentrant geometries. 展开更多
关键词 Auxetic Poisson’s ratio Reentrant finite element analysis Elasticity
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ESD保护电路在HDMI板级信号完整性中的影响分析及其布局优化研究 被引量:2
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作者 王淼 李嘉豪 +1 位作者 汤浩 郭亚 《现代电子技术》 北大核心 2024年第8期68-74,共7页
为了解决HDMI接入ESD保护电路后信号完整性受破坏等问题,从器件的空间布局对HDMI信号完整性影响进行研究分析,同时考虑了瞬态电压抑制(TVS)高频寄生参数的影响,搭建了ESD放电模型和TVS高频等效电路模型,并对其可靠性进行了验证。从差分... 为了解决HDMI接入ESD保护电路后信号完整性受破坏等问题,从器件的空间布局对HDMI信号完整性影响进行研究分析,同时考虑了瞬态电压抑制(TVS)高频寄生参数的影响,搭建了ESD放电模型和TVS高频等效电路模型,并对其可靠性进行了验证。从差分器件接入信号线旋转角度和彼此间错开距离研究其对信号完整性的影响,设计了25套不同夹角和4套不同错开距离的板级模型,在不同特性的传输频率下进行S参数仿真,并从中选取出垂直型、水平型、错开型三种具有代表性的空间布局模型,利用有限元仿真得到差分信号线的S参数和眼图。仿真结果表明,垂直型排布相比于其他两种典型空间布局,回波损耗平均降低了248.1%,插入损耗平均降低了20.6%,眼图的眼宽和眼高在三种空间布局中最大。研究成果为PCB静电放电保护电路分析与设计提供了布局优化指导。 展开更多
关键词 静电放电(EsD) HDMI 信号完整性 空间布局优化 瞬态电压抑制(TVs) s参数 有限元仿真
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Spline Fictitious Boundary Element Alternating Method for Edge Crack Problems with Mixed Boundary Conditions 被引量:1
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作者 Z.Xu M.Chen X.M.Fan 《Computer Modeling in Engineering & Sciences》 SCIE EI 2018年第9期407-431,共25页
The alternating method based on the fundamental solutions of the infinite domain containing a crack,namely Muskhelishvili’s solutions,divides the complex structure with a crack into a simple model without crack which... The alternating method based on the fundamental solutions of the infinite domain containing a crack,namely Muskhelishvili’s solutions,divides the complex structure with a crack into a simple model without crack which can be solved by traditional numerical methods and an infinite domain with a crack which can be solved by Muskhelishvili’s solutions.However,this alternating method cannot be directly applied to the edge crack problems since partial crack surface of Muskhelishvili’s solutions is located outside the computational domain.In this paper,an improved alternating method,the spline fictitious boundary element alternating method(SFBEAM),based on infinite domain with the combination of spline fictitious boundary element method(SFBEM)and Muskhelishvili’s solutions is proposed to solve the edge crack problems.Since the SFBEM and Muskhelishvili’s solutions are obtained in the framework of infinite domain,no special treatment is needed for solving the problem of edge cracks.Different mixed boundary conditions edge crack problems with varies of computational parameters are given to certify the high precision,efficiency and applicability of the proposed method compared with other alternating methods and extend finite element method. 展开更多
关键词 sPLINE fictitious BOUNDARY element ALTERNATING METHOD mixed BOUNDARY conditions edge CRACK problem Muskhelishvili’s solutions stress INTENsITY factor
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Finite element analysis of slope stability by expanding the mobilized principal stress Mohr's circles-Development, encoding and validation 被引量:2
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作者 Djillali Amar Bouzid 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第4期1165-1179,共15页
In recent years,finite element analysis is increasingly being proposed in slope stability problems as a competitive method to traditional limit equilibrium methods(LEMs)which are known for their inherent deficiencies.... In recent years,finite element analysis is increasingly being proposed in slope stability problems as a competitive method to traditional limit equilibrium methods(LEMs)which are known for their inherent deficiencies.However,the application of finite element method(FEM)to slope stability as a strength reduction method(SRM)or as finite element limit analysis(FELA)is not always a success for the drawbacks that characterize both methods.To increase the performance of finite element analysis in this problem,a new approach is proposed in this paper.It consists in gradually expanding the mobilized stress Mohr’s circles until the soil failure occurs according to a prescribed non-convergence criterion.The present approach called stress deviator increasing method(SDIM)is considered rigorous for three main reasons.Firstly,it preserves the definition of the factor of safety(FOS)as the ratio of soil shear strength to the mobilized shear stress.Secondly,it maintains the progressive development of shear stress resulting from the increase in the principal stress deviator on the same plane,on which the shear strength takes place.Thirdly,by introducing the concept of equivalent stress loading,the resulting trial stresses are checked against the violation of the actual yield criterion formed with the real strength parameters rather than those reduced by a trial factor.The new numerical procedure was encoded in a Fortran computer code called S^(4)DINA and verified by several examples.Comparisons with other numerical methods such as the SRM,gravity increasing method(GIM)or even FELA by assessing both the FOS and contours of equivalent plastic strains showed promising results. 展开更多
关键词 slope stability finite element analysis strength reduction method(sRM) stress point-based factor of safety(FOs) Limit equilibrium method(LEM) stress deviator Mohr’s circle Plastic strain
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Finite Element Analysis of Elastic-Plastic Contact Mechanic Considering the Effect of Contact Geometry and Material Properties 被引量:1
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作者 Abodol Rasoul Sohouli Ali Maozemi Goudarzi Reza Akbari Alashti 《Journal of Surface Engineered Materials and Advanced Technology》 2011年第3期125-129,共5页
Each surface of roughness has different shape of asperity which is modeled with various shapes of analytical models. In this paper, the differences among various models of shape of asperity investigate using the Finit... Each surface of roughness has different shape of asperity which is modeled with various shapes of analytical models. In this paper, the differences among various models of shape of asperity investigate using the Finite Element Method (FEM) and various analytical models. The contact stresses in rough surfaces are calculated analytically using various asperity shape models. Finite element analysis is also carried out assuming three types of material properties namely, the linear, the elastic-perfect plastic and the elastic-nonlinear hardening. The analytical results are compared with the results obtained by the finite element method. The results illustrate for using a deterministic approach which the numerical models are suitable. In hertz model, the result of force is very big in interface of causing deformation plastic, while Model Zhao has almost same result with FEM nonlinear property model. It is observed that the results obtained from Zhao’s model are generally in a better agreement with the results obtained from various finite element models especially in elastic-plastic and plastic zones, hence it may be concluded that Zhao’s model can be used for analyzing the rough surfaces in contact mechanics. 展开更多
关键词 CONTACT MECHANICs Micro-Contact finite element Method (FEM) Zhao’s MODEL Chang’s MODEL
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Finite Element Analysis of Diamond Saw Blades to Prevent Steel Base Wear
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作者 HU Ying-ning 1,WANG Cheng-yong 2,WEI Xin 2,LI Zhi-guo 1 (1.Department of Mechanical Engineering,Guangxi University,Nanning 530 004,China 2.Department of Mechanical Engineering,Guangdong University of Technol ogy, Guangzhou 510090,China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期299-,共1页
The FEM analysis of stress and deformation of steel base of the special diamond saw blades are carried out.The small carbide round segments are welded on the side of blades in order to increase the side wear re sistan... The FEM analysis of stress and deformation of steel base of the special diamond saw blades are carried out.The small carbide round segments are welded on the side of blades in order to increase the side wear re sistance of blade.Comparing with conventional saw blade,the maximum stress val ues of reasonable special saw blade are reduced respectively about 17%20% 33%,and the maximum deformation values are reduced respectively about 26%22 %44.7%in thetangential(X),radial(Y)and axial(Z)direction.The stress conce ntration zone is decreased for the special structure diamond saw blade.The stru ctures of diamond saw blade with different number of hard material pellet are an alyzed and optimized. 展开更多
关键词 diamond saw blades side wear finite element analysi s
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一类非线性Poisson-Nernst-Planck方程的边平均有限元计算
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作者 卢晓婷 阳莺 《桂林电子科技大学学报》 2024年第1期81-86,共6页
针对一类非线性Poisson-Nernst-Planck数学模型,为提高数值求解效率并保证数值求解稳定性,推导了边平均有限元离散格式,并给出了数值求解的耦合迭代算法。在对网格进行一些适当假设的情况下,边平均有限元离散格式的刚度矩阵是一个M-阵,... 针对一类非线性Poisson-Nernst-Planck数学模型,为提高数值求解效率并保证数值求解稳定性,推导了边平均有限元离散格式,并给出了数值求解的耦合迭代算法。在对网格进行一些适当假设的情况下,边平均有限元离散格式的刚度矩阵是一个M-阵,数值求解比标准有限元方法更稳定。数值结果表明,边平均有限元方法的L^(2)模误差收敛阶达到最优阶,且在自由度相同情况下,边平均有限元方法所用CPU时间大约是标准有限元方法的1/3。 展开更多
关键词 非线性Poisson-Nernst-Planck方程 边平均有限元方法 标准有限元方法
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A Finite Element Procedure for Analysis of Chemo-Mechanical Coupling Behavior of Hydrogels
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作者 Wei Wei Qingsheng Yang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2016年第7期33-58,共26页
Chemo-mechanical coupling behavior of materials is a transformation process between mechanical and chemical energy.In this paper,based on the coupled chemo-mechanical constitutive equations and governing equations dur... Chemo-mechanical coupling behavior of materials is a transformation process between mechanical and chemical energy.In this paper,based on the coupled chemo-mechanical constitutive equations and governing equations during isothermal process,the equivalent integral forms of chemo-mechanical coupling governing equations and corresponding finite element procedure are obtained by using Hamilton’s principle.An isoparametric plane element for chemo-mechanical coupling is associated into ABAQUS finite element package through user element subroutine UEL.The numerical examples exhibit that the ionic concentration variation can cause mechanical deformation and mechanical action can produce redistribution of ionic concentration for hydrogels.It is proved that the present developed chemo-mechanical coupling finite element procedure can be utilized to model the coupling behavior of hydrogels effectively. 展开更多
关键词 HYDROGEL Chemo-mechanical coupling Hamilton’s PRINCIPLE Coupled finite element method
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Least Square Finite Element Method for Viscous Splitting of Unsteady Incompressible Navier–Stokes Equations
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作者 SHUI Qing-xiang WANG Da-guo +1 位作者 HE Zhi-liang HUANG Jin 《China Ocean Engineering》 SCIE EI CSCD 2018年第4期490-500,共11页
In order to solve unsteady incompressible Navier–Stokes(N–S) equations, a new stabilized finite element method,called the viscous-splitting least square FEM, is proposed. In the model, the N–S equations are split i... In order to solve unsteady incompressible Navier–Stokes(N–S) equations, a new stabilized finite element method,called the viscous-splitting least square FEM, is proposed. In the model, the N–S equations are split into diffusive and convective parts in each time step. The diffusive part is discretized by the backward difference method in time and discretized by the standard Galerkin method in space. The convective part is a first-order nonlinear equation.After the linearization of the nonlinear part by Newton’s method, the convective part is also discretized by the backward difference method in time and discretized by least square scheme in space. C0-type element can be used for interpolation of the velocity and pressure in the present model. Driven cavity flow and flow past a circular cylinder are conducted to validate the present model. Numerical results agree with previous numerical results, and the model has high accuracy and can be used to simulate problems with complex geometry. 展开更多
关键词 unsteady incompressible N–s equations viscous splitting Newton's method least square finite element method driven cavity flow flow past a circular cylinder
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Three-Dimensional Finite Element Superconvergent Gradient Recovery on Par6 Patterns
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作者 Jie Chen Desheng Wang 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2010年第2期178-194,共17页
In this paper, we present a theoretical analysis for linear finite element superconvergent gradient recovery on Par6 mesh, the dual of which is centroidal Voronoi tessellations with the lowest energy per unit volume a... In this paper, we present a theoretical analysis for linear finite element superconvergent gradient recovery on Par6 mesh, the dual of which is centroidal Voronoi tessellations with the lowest energy per unit volume and is the congruent cell predicted by the three-dimensional Gersho's conjecture. We show that the linear finite element solution uh and the linear interpolation uI have superclose gradient on Par6 meshes. Consequently, the gradient recovered from the finite element solution by using the superconvergence patch recovery method is superconvergent to Vu. A numerical example is presented to verify the theoretical result. 展开更多
关键词 sUPERCONVERGENCE Par6 finite element method centroidal Voronoi tessellations Gersho's conjecture.
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A FINITE ELEMENT ADAPTIVE METHOD FOR SOLVING GENERALIZED STOKES PROSLEM
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作者 D. A.Fokin Yang Zuosheng(Department of Aerodynamics ,NUAA 29 Yudao Street.Nanjing 21001 P.China) 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1994年第1期1-6,共6页
A stabilized and convergent finite element formulation for the generalized Stokes problem is proposed and a posteriori analysis is performed to produce an error indicator. On this basis adaptive numerical method for s... A stabilized and convergent finite element formulation for the generalized Stokes problem is proposed and a posteriori analysis is performed to produce an error indicator. On this basis adaptive numerical method for solying the problem is developed . Numerical calculations are performed to confirm the reliability and effectiveness of the method. 展开更多
关键词 finite element method error EsTIMATE N-s e-quation generalized sTOKEs problems adaptive finite element methods
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Finite Element Analysis of Osteotomy Treatment for Kienbock’s Disease
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作者 Guang Yang Kimberly A. Partridge +2 位作者 Ahmed Abdel-Mohti Alex J. McMullen Hui Shen 《Journal of Biomedical Science and Engineering》 2016年第10期161-170,共10页
Lateral closing wedge osteotomy is a treatment for Kienbock’s disease. It is one of the most frequently used treatment options, which has been reported with relatively good long-term results. However, the results abo... Lateral closing wedge osteotomy is a treatment for Kienbock’s disease. It is one of the most frequently used treatment options, which has been reported with relatively good long-term results. However, the results about the treatment are still controversial in some literatures and some key mechanisms are still not clear. The objective of the cur-rent study was to study the biomedical mechanism of the treatment. A finite element model was developed based on the geometry of carpal bones. Various situations in-cluding inclination angle changes by cutting the radial with 0?, 5?, 10? and 15? osteot-omy angles were studied. The effectiveness of the treatment was also studied for the carpal structure with abnormal positions of the lunate bone. The results show that the effectiveness of the stress reduction with the angle depends on many situations such as the initial morphology of the carpal structure. 展开更多
关键词 Lateral Closing Wedge Osteotomy Kienbock’s Disease finite element BIOMEDICAL TREATMENT
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S形钢丝初辊压工艺的数值分析
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作者 赵远 贾力 +5 位作者 胡丞杨 周能作 王飞 朱晓雄 薛花娟 赵军 《现代交通与冶金材料》 CAS 2024年第5期17-23,共7页
根据主缆S形钢丝的技术指标要求,利用有限元分析和试验测试等手段,在保持总变形不变的条件下,对10#钢分别进行4道、6道、8道初辊压测试试验。试验结果表明S形钢丝应力的集中区域存在于变形过渡区和辊缝中心线的主要变形区,随着辊压道次... 根据主缆S形钢丝的技术指标要求,利用有限元分析和试验测试等手段,在保持总变形不变的条件下,对10#钢分别进行4道、6道、8道初辊压测试试验。试验结果表明S形钢丝应力的集中区域存在于变形过渡区和辊缝中心线的主要变形区,随着辊压道次的增加,拉长的晶粒也更多。数值分析的预测结果与实验表征的结果具有良好的一致性。 展开更多
关键词 初辊压 s形钢丝 有限元分析 应力-应变
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基于S-A模型的覆冰输电线绕流数值分析 被引量:1
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作者 廖绍凯 张研 陈达 《河海大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第1期110-117,共8页
基于Spalart-Allmaras湍流模型(S-A模型)封闭的雷诺平均N-S方程,采用沿均匀流线的三阶Runge-Kutta法和Galerkin法分别进行时间和空间离散,得到了湍流方程的有限元格式。采用自编Matlab程序,数值模拟了不同风攻角下覆冰输电线绕流问题,... 基于Spalart-Allmaras湍流模型(S-A模型)封闭的雷诺平均N-S方程,采用沿均匀流线的三阶Runge-Kutta法和Galerkin法分别进行时间和空间离散,得到了湍流方程的有限元格式。采用自编Matlab程序,数值模拟了不同风攻角下覆冰输电线绕流问题,得到了覆冰输电线绕流瞬态和时均流场、气动力系数时程曲线和平均气动力系数随风攻角的变化关系,并与试验结果进行对比,验证了该算法的有效性。基于流场演化和平均压力分布,分析表明风攻角变化引起的边界层分离点转移是产生升力系数尖峰突跳现象的主要原因。 展开更多
关键词 spalart-Allmaras模型 雷诺平均N-s方程 RUNGE-KUTTA法 有限元格式 覆冰输电线 流场演化 气动力系数
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波纹管参数对TRB管胀形S型波纹管壁厚分布的影响
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作者 何滔 顾栩 《机械设计与制造工程》 2023年第4期130-134,共5页
为研究TRB管无轴向补料胀形S型波纹管壁厚分布影响因素,通过理论设计构建了TRB管坯参数与S型波纹管参数的几何关系,并建立了胀形有限元模型。研究了S型波纹管参数波纹圆心角、波纹曲率半径、波纹管内半径对壁厚分布的影响。圆心角增大时... 为研究TRB管无轴向补料胀形S型波纹管壁厚分布影响因素,通过理论设计构建了TRB管坯参数与S型波纹管参数的几何关系,并建立了胀形有限元模型。研究了S型波纹管参数波纹圆心角、波纹曲率半径、波纹管内半径对壁厚分布的影响。圆心角增大时,设计壁厚与最大壁厚的差(正差)、与最小壁厚的差(负差)以及最大壁厚与最小壁厚的差(总差)快速增大,圆心角对壁厚分布影响显著。当圆心角为42°时,负差为设计壁厚的11.4%,总差为19.3%,壁厚分布不均匀。曲率半径和波纹管内半径对壁厚分布影响不显著,合理的参数范围内,TRB管胀形S型波纹管壁厚分布均匀。 展开更多
关键词 s型波纹管 TRB管 液压胀形 有限元 壁厚均匀
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EXPLICIT ERROR ESTIMATE FOR THE NONCONFORMING WILSON'S ELEMENT 被引量:3
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作者 赵纪坤 陈绍春 《Acta Mathematica Scientia》 SCIE CSCD 2013年第3期839-846,共8页
In this article, we study the explicit expressions of the constants in the error estimate of the nonconforming finite element method. We explicitly obtain the approximation error estimate and the consistency error est... In this article, we study the explicit expressions of the constants in the error estimate of the nonconforming finite element method. We explicitly obtain the approximation error estimate and the consistency error estimate for the Wilson's element without the regular assumption, respectively, which implies the final finite element error estimate. Such explicit a priori error estimates can be used as computable error bounds. 展开更多
关键词 Nonconforming finite element explicit error estimate Wilson's element
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Tip-Edge Plus双丝技术扭转力学性能三维有限元分析 被引量:4
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作者 吴定丹 杨钦佩 +2 位作者 周容 白蕊 黄跃 《安徽医科大学学报》 CAS 北大核心 2019年第2期312-316,共5页
运用有限元法探究Tip-Edge Plus托槽应用双丝技术时的扭转力学性能。建立Tip-Edge Plus托槽及不同尺寸材质弓丝的有限元模型,按实验分组分别进行力学加载,收集各组实验数据。实验显示:(1)当弓丝材质相同时,双丝组扭转力矩值均大于单丝组... 运用有限元法探究Tip-Edge Plus托槽应用双丝技术时的扭转力学性能。建立Tip-Edge Plus托槽及不同尺寸材质弓丝的有限元模型,按实验分组分别进行力学加载,收集各组实验数据。实验显示:(1)当弓丝材质相同时,双丝组扭转力矩值均大于单丝组;(2)当弓丝材质不同时,扭转力矩值0. 014镍钛弓丝(Ni Ti)+0. 016 Ni Ti> 0. 020澳大利亚弓丝(Aus)> 0. 018 Aus> 0. 014 Ni Ti+0. 014 Ni Ti> 0. 012 Ni Ti+0. 016 Ni Ti> 0. 016 Aus> 0. 012 Ni Ti+0. 014 Ni Ti> 0. 014Aus。扭转力矩值与扭转角度、弓丝尺寸成正相关,双丝较单丝趋势明显,辅弓丝尺寸的影响较主弓丝大;临床上可根据牙齿的扭转情况选用适合的双丝组合。 展开更多
关键词 TIP-edge Plus托槽 双丝技术 扭转 三维有限元法
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基于Solid Edge NX-Nastran软件的力学试验台改进设计
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作者 杨泽林 张杰竣 +2 位作者 陈建兴 曾洪涛 郭俊标 《数字技术与应用》 2017年第7期153-154,共2页
本文主要介绍使用Solid Edge软件对材料力学多功能实验台进行结构优化的方法。具体方案是使用Solid Edge NX-Nastran对原设备进行有限元分析,根据分析结果优化设备结构,改善受力情况,提高其使用精度与寿命。
关键词 结构优化 有限元分析 sOLID edge NXNastran
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