The descending part of the curves are much sharper than the ones under the normal temperature . the ductility of the concrete will also get worse and the brittleness will increase 应力?应变曲线形状随负温值的增大变得高而窄，曲线的下降段比常温陡直，混凝土的延性变差，脆性增大。
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。
It includes dynamic indentation experimental equipment , strain measuring circuit , data acquisition system . this system can be used to implement dynamic indentation experiment on the material surface 这套系统可以用来对材料进行动态压痕试验,获得材料的动态力学参数,也可以获得材料的动态应力-应变曲线,从而分析材料的动态塑性性能。
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。
The response of mmcs has a turning point , associated with the initiation of interfacial debonding , which is decided by the interfacial strength . unlike the two predecessors , the evolving complaint interface ( eci ) model allows unloading of interfacial stresses 在常响应界面情况下，复合材料横向拉伸应力?应变曲线存在明显的转折点，对应于界面分离的始发点，转折点的位置取决于界面粘结强度。
