In order to establish the nonlinear elastic model of qi loess , the hump curve was used to stimulate both the softening stress - strain curve and the volume deformation curve 对软化型应力应变曲线提出用驼峰曲线模拟，对体变曲线也提出用能反映剪胀的驼峰曲线模拟，建立了q1黄土的非线性弹性k 、 g模型。
Consequently , although the initial part of the unloading stress - strain curve might be approximately linear , this did not mean that the system response was elastic , as frequently assumed in continuum theories 因此，尽管在卸载应力应变曲线的初始段约为线性，但这并不意味着颗粒系统的响应如传统连续力学中假定的那样为弹性。
For metals that experience the gradual elastic - plastic transition , the point of yielding is determined as the initial departure from linearity of the stress - strain curve and this is sometimes called the proportional limit 对于金属逐步的弹塑性形变转变，其屈服点确定为应力应变曲线非线性关系的开始，这个点也被称为比例极限。
The thickness is only 200um , and the width of the test part is 300u . m . it is first time nationally to use such a small specimen to measure mechanical properties of materials with uniaxial tension test 本文采用的拉伸试样，厚度只有200 m ，试验段宽度为300 m ，对如此微小的试样进行单轴拉伸试验以得到其应力应变曲线在国内还是首次。
The stress - strain curves are different from macroscale situation . varied strain rates have different effects to nanometer material deformation . compared with macroscale , nanoscale mechanical behaviour of bending is dissimilarity 拉伸作用下的应力应变曲线变化趋势并不与宏观介质连续力学下完全相同，不同的应变率会对材料变形造成不同的影响。
According to testing results , the stress - strain curve of the cemented soil stabilized the nanometer silica fume is fitted using a quadratic parabolic curve and expression equation for upward sector of the stress - stra in curve is given 根据试验结果，分析了纳米硅粉水泥土的变形特性，并对其应力应变曲线进行了二次抛物线拟合分析，推导了曲线上升段的表达式。
It ' s we1l known that the windshield material is an organic material . it shows visco - plastic behavior which is that the stress - strain curve , the yield stress and the limited stfess varied with the material deformation rate 众所周知，风挡材料为有机材料，一方面呈现出粘弹塑性特性，即材料的应力应变曲线、屈服应力、破坏应力都随着材料变形速率的变化而变化。
2 . the static tensile test of unit cells was simulated by finite element method . the theoretical results were compared with the practically experimental results and the rationality and feasibility of the micro - mechanical model was checked 对代表单元体模型在静态加载条件下的拉伸情况进行有限元模拟，将计算得到的理论应力应变曲线与cu纳米微米晶复合材料实际拉伸曲线进行比较，验证该模型的合理性与可行性。
Analyzing the stress - strain curve of the two kinds of soils , and comparing the strength parameters of expansive soils with that of reinforced soils , the author finds the reason that the intension of the reinforced soils gets stronger than that of expansive soils is studied 通过分析素土及其加筋土的应力应变曲线及比较它们的强度参数指标，研究加筋土强度提高的原因。试验结果表明，本文对实际工程有一定的指导意义。
The results indicate that stress - strain curves with different water contents , consolidation stresses and stress paths are evidently dissimilar , which are correspondingly described with softening elastic - plastic model , ideal elastic - plastic model and hyperbolic elastic model 研究表明，原状黄土含水量不同、固结围压不同、应力路径不同、应力应变曲线亦显著不同，可以由软化弹塑性模型、理想弹塑性模型或双曲线弹性模型描述。
