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A novel finite element formulation for static bending analysis of functionally graded porous sandwich plates 被引量:1
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作者 Van Chinh NGUYEN Trung Thanh TRAN +1 位作者 Trung NGUYEN-THOI Quoc-Hoa PHAM 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2022年第12期1599-1620,共22页
This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich plates.The FGP sandwich plates consist of three layers incl... This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich plates.The FGP sandwich plates consist of three layers including the bottom skin of homogeneous metal,the top skin of fully ceramic and the FGP core layer with uneven porosity distribution.A quadrilateral(Q4)element with nine degrees of freedom(DOFs)per node is derived and employed in analyzing the static bending response of the plate under uniform and/or sinusoidally distributed loads.The accuracy of the present finite element formulation is verified by comparing the obtained numerical results with the published results in the literature.Then,some numerical examples are performed to examine the effects of the parameters including power-law index k and porosity coefficient on the static bending response of rectangular FGP sandwich plates.In addition,a problem with a complicated L-shape model is conducted to illustrate the superiority of the proposed finite element method. 展开更多
关键词 sandwich plates functionally graded porous static bending Quasi-3D theory Q4 element
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Static and free vibration analyses of functionally graded porous variable-thickness plates using an edge-based smoothed finite element method 被引量:3
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作者 Trung Thanh Tran Quoc-Hoa Pham Trung Nguyen-Thoi 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期971-986,共16页
The main purpose of this paper is to present numerical results of static bending and free vibration of functionally graded porous(FGP) variable-thickness plates by using an edge-based smoothed finite element method(ES... The main purpose of this paper is to present numerical results of static bending and free vibration of functionally graded porous(FGP) variable-thickness plates by using an edge-based smoothed finite element method(ES-FEM) associate with the mixed interpolation of tensorial components technique for the three-node triangular element(MITC3), so-called ES-MITC3. This ES-MITC3 element is performed to eliminate the shear locking problem and to enhance the accuracy of the existing MITC3 element. In the ES-MITC3 element, the stiffness matrices are obtained by using the strain smoothing technique over the smoothing domains formed by two adjacent MITC3 triangular elements sharing an edge. Materials of the plate are FGP with a power-law index(k) and maximum porosity distributions(U) in the forms of cosine functions. The influences of some geometric parameters, material properties on static bending, and natural frequency of the FGP variable-thickness plates are examined in detail. 展开更多
关键词 Functionally graded porous(FGP)plates Edge-based smoothed finite element method(ES-FEM) Mixed interpolation of tensorial components(MITC) static bending Free vibration
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A Multiscale Model of Mass-Functionally Graded Beam-Fluid System Under Bending and Vibration Responses
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作者 Lei Zhang Jianping Lin +1 位作者 Jiaqing Jiang Guannan Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2024年第2期327-340,共14页
In this paper,a multiscale model is developed for the mass functionally graded(FG)beam-fluid system to investigate its static and dynamic responses based on 3D printed porous beam free vibration tests,which are determ... In this paper,a multiscale model is developed for the mass functionally graded(FG)beam-fluid system to investigate its static and dynamic responses based on 3D printed porous beam free vibration tests,which are determined by two aspects.At the microstructural level,the gradient variation is realized by arbitrary distribution of matrix pores,and the effective moduli under specific distribution are obtained using the micromechanics homogenization theory.In the meantime,at the structural level,the mechanical responses of FG porous beams subjected to mass loading are considered in a static fluid environment.Then,the explicit expressions of local finite-element(FE)expressions corresponding to the static and dynamic responses are given in the appendices.The present results are validated against numerical and experimental results from the literature and mechanical tests of 3D printed structures,with good agreement generally obtained,giving credence to the present model.On this basis,a comprehensive parametric study is carried out,with a particular focus on the effects of boundary conditions,fluid density,and slenderness ratio on the bending and vibration of FG beams with several different gradations. 展开更多
关键词 3D printed test Mass functionally graded beam-fluid system Multiscale model Local finite-element expressions static bending Free vibration
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Decay threshold of acetylated rattan (Calamus manan) against soft rot
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作者 Norul Hisham Hamid Mike Hale 《Journal of Forestry Research》 SCIE CAS CSCD 2013年第2期375-380,共6页
We investigated the resistance of acetylated rattan against soft rot and other soil inhabiting micro-organisms in comparison with wood of beech and Scots pine. Calamus manan of 10 and 13 years old under rubber tree ca... We investigated the resistance of acetylated rattan against soft rot and other soil inhabiting micro-organisms in comparison with wood of beech and Scots pine. Calamus manan of 10 and 13 years old under rubber tree canopy was acetylated to different levels by reaction times (0.25 to 30 hours) and was tested for soft rot decay for 32 weeks. Acetylated rattan at decay protection thresholds of 15.4% and 16.2% weight gain (WG) were fully protected, as shown by both weight loss and strength loss criteria. The static bending properties of untreated rattan decayed by soft rot were significantly lower than for acetylated rattan. 展开更多
关键词 ACETYLATION cultivated rattan soft rot static bending properties
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Static and dynamic analysis of functionally graded fluidinfiltrated porous skew and elliptical nanoplates using an isogeometric approach
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作者 Tran Thi Thu THUY 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第3期477-502,共26页
The analysis of static bending and free and forced vibration responses of functionally graded fluidinfiltrated porous(FGFP)skew and elliptical nanoplates placed on Pasternak’s two-parameter elastic foundation is perf... The analysis of static bending and free and forced vibration responses of functionally graded fluidinfiltrated porous(FGFP)skew and elliptical nanoplates placed on Pasternak’s two-parameter elastic foundation is performed for the first time using isogeometric analysis(IGA)based on the non-uniform rational B-splines(NURBSs)basis function.Three types of porosity distributions affect the mechanical characteristics of materials:symmetric distribution,upper asymmetric distribution,and lower asymmetric distribution.The stress–strain relationship for Biot porous materials was determined using the elastic theory.The general equations of motion of the nanoplates were established using the four-unknown shear deformation plate theory in conjunction with the nonlocal elastic theory and Hamilton’s principle.A computer program that uses IGA to determine the static bending and free and forced vibration of a nanoplate was developed on MATLAB software platform.The accuracy of the computational program was validated via numerical comparison with confidence assertions.This set of programs presents the influence of the following parameters on the static bending and free and forced vibrations of nanoplates:porosity distribution law,porosity coefficient and geometrical parameters,elastic foundation,deviation angle,nonlocal coefficient,different boundary conditions,and Skempton coefficients.The numerical findings demonstrated the uniqueness of the FGFP plate’s behavior when the porosities are saturated with liquid compared with the case without liquid.The findings of this study have significant implications for engineers involved in the design and fabrication of the aforementioned type of structures.Furthermore,this can form the basis for future research on the mechanical responses of the structures. 展开更多
关键词 static bending free and forced vibrations nonlocal theory isogeometric analysis fluid-infiltrated porous nanoplates
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Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiberreinforced concrete railway sleepers
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作者 Sayed AHMED Hossam ATEF Mohamed HUSAIN 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第3期411-428,共18页
In this study,ultrahigh-performance fiber-reinforced concrete(UHPFRC)used in a type B70 concrete sleeper is investigated experimentally and parametrically.The main parameters investigated are the steel fiber volume fr... In this study,ultrahigh-performance fiber-reinforced concrete(UHPFRC)used in a type B70 concrete sleeper is investigated experimentally and parametrically.The main parameters investigated are the steel fiber volume fractions(0%,0.5%,1%,and 1.5%).Under European standards,35 UHPFRC sleepers are subjected to static bending tests at the center and rail seat sections,and the screw on the fastening system is pulled out.The first cracking load,failure load,failure mode,crack propagation,load–deflection curve,load–crack width,and failure load from these tests are measured and compared with those of a control sleeper manufactured using normal concrete C50.The accuracy of the parametric study is verified experimentally.Subsequently,the results of the study are applied to UHPFRC sleepers with different concrete volumes to investigate the effects of the properties of UHPFRC on their performance.Experimental and parametric study results show that the behavior of UHPFRC sleepers improves significantly when the amount of steel fiber in the mix is increased.Sleepers manufactured using UHPFRC with a steel fiber volume fraction of 1%and a concrete volume less than 25%that of standard sleeper B70 can be used under the same loads and requirements,which contributes positively to the cost and surrounding environment. 展开更多
关键词 pre-stressed concrete sleeper ultrahigh performance fiber-reinforced concrete pull-out test static bending test steel fiber aspect ratio volume fraction
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A Transversely Isotropic Magne to -Elec tro-Elastic Circular Kirchhoff Plate Model Incorporating Microstructure Effect 被引量:2
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作者 Wei Shen Gongye Zhang +1 位作者 Shuitao Gu Yu Cong 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2022年第2期185-197,共13页
A non-classical model for transversely isotropic magneto-electro-elastic circular Kirchhoff plates is established based on the extended modified couple stress theory.The Gibbs-type variational principle is used to obt... A non-classical model for transversely isotropic magneto-electro-elastic circular Kirchhoff plates is established based on the extended modified couple stress theory.The Gibbs-type variational principle is used to obtain the governing equations and boundary cond计ions.To illustrate the newly derived model,the static bending problem of a clamped circular plate subjected to a uniformly distributed constant load is solved numerically by Fourier-Bessel series.The numerical results show that the values of transverse displacement,electric and magnetic potentials predicted by the current model are always smaller than those of the classical model,and the differences are diminishing as the plate thickness increases.In addition,it is shown that the magneto-electro-elastic coupling effect plays an important role in the transverse displace-ment,elec trie pot ential and magnetic pot ential of the magne to-elec tr o-elastic circular Kirchhoff plates.Furthermore,several reduced specific models are provided for simpler cases. 展开更多
关键词 Circular Kirchhoff plate Magneto-electro-elastic plate Microstructure effect Couple stress theory static bending
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Application of finite element analysis in properties test of finger-jointed lumber 被引量:1
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作者 Sheng He Lanying Lin +1 位作者 Zaixing Wu Zhangmin Chen 《Journal of Bioresources and Bioproducts》 EI 2020年第2期124-133,共10页
Finger-jointed lumber production has now become the most extensively used method for spliced lumbers jointing together endwise.The properties of finger-jointed lumber are affected by many different factors such as the... Finger-jointed lumber production has now become the most extensively used method for spliced lumbers jointing together endwise.The properties of finger-jointed lumber are affected by many different factors such as the end-pressure.The main mechanical properties to be tested for struc-tural use finger-jointed lumber include the modulus of elasticity in static bending and the bending strength.The most commonly used method for testing these properties at present is the experi-mental test.In this study,we used finite element method to investigate the end-pressure range,the modulus of elasticity in static bending and the bending strength for Pinus sylvistriv var.finger-jointed lumber under three different fitness ratios(0 mm,0.1 mm,0.3 mm).With finite element analysis(FEA)modelling results compared with the experimental test results,it is possible to find the relationship between these two kinds of results and use the FEA to predict the properties of finger-jointed lumber.The FEA applied in the end pressure tests showed a narrower range com-pared with the modelling results.It indicated that the FEA could be used in the prediction of the end pressure for finger-jointed lumber.The modelling results for modulus of elasticity(MOE)test and bending strength(MOR)test showed about 20%discrepancies compared with the experimen-tal results.Moreover,the MOE modelling results showed the same trend as experimental results under three different fitness levels while the MOR modelling results showed the different trend.It can be concluded that the FEA is a feasible way in analysing the properties of finger-jointed lumber if the errors could be eliminated properly.Some modifications should be made in order to realize the prediction of the properties of finger-jointed lumber more accurately. 展开更多
关键词 Finite element analysis Finger jointed lumber End-pressure Modulus of elasticity in static bending bending strength
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Magnetically induced electric potential in first-order composite beams incorporating couple stress and its flexoelectric effects
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作者 Gongye Zhang Yilin Qu +1 位作者 Ziwen Guo Feng Jin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2021年第10期1509-1519,I0002,共12页
A new model of a first-order composite beam with flexoelectric and piezomagnetic layers is developed.The new model is under a transverse magnetic field and can capture the couple stress and its flexoelectric effects.T... A new model of a first-order composite beam with flexoelectric and piezomagnetic layers is developed.The new model is under a transverse magnetic field and can capture the couple stress and its flexoelectric effects.The governing equations are obtained through a variational approach.To illustrate the new model,the static bending problem is analytically solved based on a Navier’s technique.The numerical results reveal that the extension,deflection,and shear deformation of the current or couple stress relevant flexoelectric model are always smaller than those of classical models at very small scale.It is also found that the electric potentials only appear with the presence of the flexoelectric effect for this non-piezoelectric composite beam model.Furthermore,various electric potential distributions can be manipulated by the particular magnetic fields,and remote/non-contact control at micro-and nano-scales can be realized by current functional composite beams. 展开更多
关键词 Flexoelectric effect Couple stress theory Microstructure effect First-order beam Piezomagnetic layer static bending
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