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Effect of surface stress and surface-induced stress on behavior of piezoelectric nanobeam 被引量:5
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作者 Yanmei YUE Kaiyu XU +1 位作者 Xudong ZHANG Wenjing WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2018年第7期953-966,共14页
A new continuum model is developed to study the influence of surface stress on the behaviors of piezoelectric nanobeams. Different from existing piezoelectric surface models which only consider the surface properties,... A new continuum model is developed to study the influence of surface stress on the behaviors of piezoelectric nanobeams. Different from existing piezoelectric surface models which only consider the surface properties, the proposed model takes surfaceinduced initial fields into consideration. Due to the fact that the surface-induced initial fields are totally different under various boundary conditions, two kinds of beams, the doubly-clamped beam and the cantilever beam, are analyzed. Furthermore, boundary conditions can affect not only the initial state of the piezoelectric nanobeam but also the forms of the governing equations. Based on the Euler-Bernoulli beam theory, the nonlin- ear Green-Lagrangian strain-displacement relationship is applied. In addition, the surface area change is also considered in the proposed model. The governing equations of the doubly-clamped and cantilever beams are derived by the energy variation principle. Com- pared with existing Young-Laplace models, the proposed model for the doubly-clamped beam is similar to the Young-Laplace models. However~ the governing equation of the cantilever beam derived by the proposed model is very different from that derived by the Young-Laplace models. The behaviors of piezoelectric nanobeams predicted by these two models Mso have significant discrepancies, which is owing to the surface-induced initial fields in the bulk beam. 展开更多
关键词 surface effect nonlinear strain surface residual stress piezoelectric nanobeam
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Optimization of Rolling Parameters for Enhancing Surface Integrity of Aluminum Alloy
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作者 Emad Ali Hussein Jabbar Gattmah +1 位作者 Ayad Naseef Jaseem Suha K Shihab 《Journal of Harbin Institute of Technology(New Series)》 CAS 2023年第6期70-82,共13页
In this current work,aluminum alloy grade 2024 is adopted as a plate material that is used in the rolling process with three different parameters including thickness reduction,forming temperature,and density of lubric... In this current work,aluminum alloy grade 2024 is adopted as a plate material that is used in the rolling process with three different parameters including thickness reduction,forming temperature,and density of lubrication type.The experimental procedure of the rolling process is performed using the design of the experiment based on the Taguchi technique(L27),then surface roughness,surface hardness,and surface residual stresses are measured.The results showed that the lubrication density has a significant impact on the surface roughness which depends on the lubrication properties(mineral oil type,natural fat,and kinematic viscosity)while surface hardness and surface residual stresses were strongly affected by thickness reduction.On the other side,the augment in forming temperature can decrease the quality of the final surface finish and the surface hardness but reduce the induced residual stresses.The best surface finish is obtained based on the optimum condition of the rolling factors are(R%_(3),T_(1),andρ_(3))while the optimum condition of rolling parameters that generate higher hardness and compressive residual stresses are(R%_(3)T_(1)ρ_(1)). 展开更多
关键词 Rolling operation Taguchi technique Al2024 surface roughness surface hardness surface residual stresses
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Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load 被引量:1
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作者 Xia-Hui Pan 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2024年第3期371-384,共14页
Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface load.Both the effects of resi... Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface load.Both the effects of residual surface stress and surface elasticity are included.Airy stress function method and Fourier integral transform technique are used.The solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at all.Numerical results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the half-plane.Surface elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally loaded.In the remaining situations,combined effects of surface elasticity and residual surface stress should be considered.The results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface effects.The solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale. 展开更多
关键词 surface effects residual surface stress surface elasticity HALF-PLANE Analytical solutions
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Influence of residual surface stress on the fracture of nanoscale piezoelectric materials with conducting cracks
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作者 NAN HaiShun WANG BaoLin 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第2期280-285,共6页
In this paper,we analyze the stress and electric field intensity factors affected by residual surface stress for conducting cracks in piezoelectric nanomaterials.The problem is reduced to a system of non-linear singul... In this paper,we analyze the stress and electric field intensity factors affected by residual surface stress for conducting cracks in piezoelectric nanomaterials.The problem is reduced to a system of non-linear singular integral equations,whose solution is determined by iteration technique.Numerical results indicate that the residual surface stress can significantly alter the crack tip fields at nanometer length scales.Due to the residual surface stress,281he electric field can produce stress around crack tip.This suggests a strong electromechanical coupling crack tip field for nanoscale piezoelectric materials.Such a finding is considerably different from the classical fracture mechanics results.A transit electric field to stress load ratio is identified,for which influences of residual surface stresses vanish.The research is useful for the applications of nanoscale piezoelectric devices. 展开更多
关键词 fracture mechanics residual surface stress piezoelectric materials nanomechanics conducting cracks
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Three-dimensional modeling and reconstructive change of residual stress during machining process of milling, polishing, heat treatment, vibratory finishing, and shot peening of fan blade 被引量:2
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作者 Ji-Yin Zhang Chang-Feng Yao +2 位作者 Min-Chao Cui Liang Tan Yun-Qi Sun 《Advances in Manufacturing》 SCIE EI CAS CSCD 2021年第3期430-445,共16页
Residual stress during the machining process has always been a research hotspot,especially for aero-engine blades.The three-dimensional modeling and reconstructive laws of residual stress among various processes in th... Residual stress during the machining process has always been a research hotspot,especially for aero-engine blades.The three-dimensional modeling and reconstructive laws of residual stress among various processes in the machining process of the fan blade is studied in this paper.The fan blades of Ti-6Al-4V are targeted for milling,polishing,heat treatment,vibratory finishing,and shot peening.The surface and subsurface residual stress after each process is measured by the X-ray diffraction method.The distribution of the surface and subsurface residual stress is analyzed.The Rational Taylor surface function and cosine decay function are used to fit the characteristic function of the residual stress distribution,and the empirical formula with high fitting accuracy is obtained.The value and distribution of surface and subsurface residual stress vary greatly due to different processing techniques.The reconstructive change of the surface and subsurface residual stress of the blade in each process intuitively shows the change of the residual stress between the processes,which has a high reference significance for the research on the residual stress of the blade processing and the optimization of the entire blade process. 展开更多
关键词 Fan blade Machining process surface residual stress Subsurface residual stress Three-dimensional modeling Reconstructive change
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Towards Understanding Why the Thin Membrane Transducer Deforms:Surface Stress-Induced Buckling
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作者 Jianlin Liu Jing Sun Pingcheng Zuo 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2016年第2期192-199,共8页
This study is directed towards a comprehensive exploration on the deformation mechanism of the thin membrane transducer(TMT) caused by surface stress variation.We stress that the biomolecular interaction has changed... This study is directed towards a comprehensive exploration on the deformation mechanism of the thin membrane transducer(TMT) caused by surface stress variation.We stress that the biomolecular interaction has changed the magnitude of the surface stress;and when the surface stress exceeds a critical value the TMT will buckle and deform.Based upon Gurtin's theory of surface elasticity and principle of finite deformation,we abstract the TMT as a nanobeam with two clamped ends,and the close-formed governing equation set is derived accordingly.A computer code via the shooting method is developed to solve the presented two-point boundary value problem.In succession,the nanobeam deflection and critical parameters for buckling are quantitatively discussed.This investigation lays the theoretical foundation of TMTs;and it is also beneficial to gain deep insight into characterizing mechanical properties of nanomaterials and engineering nano-devices. 展开更多
关键词 surface elasticity residual surface stress large deformation buckling transducer
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Effect of Surface Polishing Treatment on the Fatigue Performance of Shot-Peened Ti–6Al–4V Alloy 被引量:3
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作者 Z.G.Liu T.I.Wong +2 位作者 W.Huang N.Sridhar S.J.Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第7期630-640,共11页
In this study, shot peening is applied to the titanium alloy Ti–6Al–4V, and the surface treatment effect on fatigue life of shot-peened specimens under high cycle loading is investigated. The induced residual stress... In this study, shot peening is applied to the titanium alloy Ti–6Al–4V, and the surface treatment effect on fatigue life of shot-peened specimens under high cycle loading is investigated. The induced residual stress is measured by using the orbital hole-drilling method. Surface profilometer and optical microscopy are employed to characterize the surface roughness and morphology. The deformed microstructure layers of the shot-peened specimens are investigated by using scanning electron microscopy. Experiments reveal that the fatigue life of Ti–6Al–4V is improved by the shot peening process, and the surface pre-peening polishing. The combination of pre-and post-peening polishing treatments further improves fatigue life of Ti–6Al–4V specimens. The present work provides useful guidelines for developing more efficient shot peening strategies. 展开更多
关键词 Shot peening surface polishing treatment Fatigue residual stress Ti–6Al–4V alloy
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Serrated plastic flow behavior and microstructure in a Zr-based bulk metallic glass processed by surface mechanical attrition treatment 被引量:1
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作者 Juan-juan Liu Qing Wang +4 位作者 Kang Sun Sebastien Gravier Jean-jacque Blandin Bao-an Sun Jian Lu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第4期475-482,共8页
The serrated plastic flow,microstructure and residual stress of a Zr_(55)Cu_(30)Ni_5Al_(10) bulk metallic glass(BMG)undergone surface mechanical attrition treatment(SMAT)have been investigated by a combinati... The serrated plastic flow,microstructure and residual stress of a Zr_(55)Cu_(30)Ni_5Al_(10) bulk metallic glass(BMG)undergone surface mechanical attrition treatment(SMAT)have been investigated by a combination of compression tests with scanning electron microscopy(SEM),high resolution transmission electron microscopy(HRTEM)and the incremental hole-drilling strain-gage method.It is found that SMAT leads to various microstructural modifications and residual stress distribution in the surface layers of the Zrbased BMG due to the mechanically-induced nanocrystallization and generation of shear bands.As a result,the BMG alloy exhibits a remarkable work-hardening like behavior and significant increase of plastic strain from less than 1%to 15%,and its plastic deformation dynamics yields a power-law distribution of shear avalanches.Based upon the analysis of the experimental results,it is indicated that this can be connected to the SMAT-induced microstructural modifications and the resulting residual compressive stress in the Zr-based BMG. 展开更多
关键词 Bulk metallic glass surface mechanical attrition treatment Serrated flow Microstructure residual stress
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