As we all know , photoelastic stress analysis is an advance method of structure stress analysis . but the limitation of some factors , such as the experimental material , is one of major challenges in the studying of photoplasticity 众所周知，光弹性应力分析已是比较成熟的结构应力分析方法，但由于实验材料等因素的限制，使光塑性的研究陷入了困境。
Although model kormanura - huang takes into account the property of visco - elastic - plastic , and can display the rheological behavior of soil , its considering on the property of plastic is very simple , so , the model can only apply for perfect plastic material 考-黄模型虽然考虑了粘弹塑性，能反映土体的流变性，但是塑性的考虑过于简单，仅仅适用于理想塑性材料。
The measure of grains " comminution is brought forward to improve plasticity at room temperature . the key of micro - crystal ' s production is that the time of sample ' s being at high temperature is shorter . the process of crystal ' s growing up will be restrained 提出了通过细化晶粒来提高室温塑性的措施，指出了细化晶粒的关键是在合成过程中使坯料处在高温状态的时间短，以抑制晶粒的长大过程。
The specified works finished are listed : 1 . with experimental load - displacement curves and acoustic emission technology , it was found that the material shows pseudo - plastic behavior under tensile loads and quasi - elastic behavior under the flexural loads 通过断裂试验的载荷位移曲线和声发射检测，发现了该材料的切口试样在拉伸载荷作用下表现为伪塑性的特征；在弯曲载荷作用下表现出准脆性的特征。
The reason of nano / micro - crystalline composite toughening was discussed . it was studied whether the micro - crystalline phase had to be completely closed by the nano - crystalline phase , so called full constrains , when it improved the ductility of nano - crystalline maters 探讨了纳米微米晶复合增韧的原因；对微米晶相发挥其改善纳米微米晶复合材料塑性的作用时，纳米晶基体相对微米晶相的包围即封闭约束的必要性进行了研究。
The electric field strengthens the laminate boundary of 2090 alloy . the laminate strengthening mechanism translates into boundary strengthening and grain inner toughening with more ductility fracture and less intergranular fracture . the ductility property is enhanced with no change of intensity 对铝理合金sem实验发现，电场固溶和时效强化了晶界，和晶内塑性的改善，断裂特征出现由分层沿晶断裂向塑性断裂转变，断面塑性变形特征增加。
Powerhouse structure has been usually looked as an elastic body for dynamical analysis and the seismic reaction has been often analyzed by response spectrum method until the present , but the materials of power - house structure are elastoplastic in nature , small tensile stress may induce cracks 摘要以往对水电站厂房结构进行动力分析时常被视为弹性体，在对其进行地震响应分析时，常采用反应谱分析方法，而实际的厂房结构是弹塑性的，不很大的拉应力即可产生裂缝。
Regard yield function as temperature and plastic strain ' s function , the deflection of simply - supported slabs under fire are analyses by coordinate finite element . the computing results show in good agreement with the results of tests . it is demonstrated that the method and the computer programs are reliable 理论分析主要是采用二维有限元分析了构件截面温度场；采用拖带坐标描述法的有限元格式，在考虑了在时间步内屈服面是温度和塑性的函数基础上，分析了简支板在火灾作用下的变形规律，所得结果与试验吻合较好。
The paper uses the coupled numerical method by combine the finite element method ( fem ) with the infinite element method ( iem ) to analysis the strength and deformation of the soil under the shallow foundation . the corresponding three - dimensional analytical program is devised by fortran9o computer language . in the program 本文即以有限元-无限元耦合的数值方法用fortran90语言编制了竖向荷载作用下浅基础地基的非线性、弹塑性三维分析程序，分析中采用的土的本构模型有非线性的邓肯-张模型、成都科大k - g模型和弹塑性的修正剑桥模型、殷宗泽双屈服面模型、 drucker - prager模型。
Local buckling capacity of steel composite beam subjected to combined bending , shear and patch loading is one of key problem in steel structures design . the computational formula for local stability of web was based on the assumption of infinite - elastic perfect plates in the steel structures design code ( gbj17 - 88 ) . but in the revised code ( gb50017 - 2003 ) , this formula was made big change with reference to british code ( bs5950 , partl ) and australian code ( as4100 ) , the related research result of our country was included as well . in the modified formula , influence of early geometric imperfection and elastic - plastic buckling stage were considered , which is compatible with both actual circumstance of engineering and the strength formula of beams under bending stresses ( considering partial plasticity of the section ) . in this paper , the preceding problem is deeply analyzed and studied , considering the effects of various geometric parameters and stress combinations on buckling critical stress of web , the revised local buckling correlative formula for transverse and longituded stiffened web panels under combined stresses is analyzed and verified by finite element method 组合钢梁腹板在弯、剪及局压复合应力作用下的局部屈曲承载能力是钢结构设计中需考虑的问题，新的《钢结构设计规范》 ( gb50017 ? 2003 )对此部分内容作了较大改动，原规范中关于腹板局部稳定的计算公式是基于无限弹性的完善板假定；新的规范则参考了英国规范( bs5950 part1 )及澳大利亚规范( as4100 )并结合我国相关研究成果，考虑了屈曲进入弹塑性阶段以及初始几何缺陷的影响。这不仅与工程实际情况相符，而且也与钢梁在弯曲应力作用下允许截面部分进入塑性的计算公式相协调。
