预应变

The paper includes:The author calculate the structures inner force and displacement of the free end , analyze the influence of the height and the value of pretress of cable by making use of ANSYS 9.0 soft, pose the concept of critical prestress,conclude the function relation between displacement of the free end, initial strain and the height of cable ,analyze the dynamic properity and point out that Newmark-β method should be adopted when we analyze the dynamic properity of the cable-stayed spatial structure with direct integral test to guarantee the contribution of high mode,finally conclude the functional relation among coefficient of earthquake inner force, initial strain and the height of cable, wish to get some helpful conclusion applied to cable-stayed spatial truss design.

本文系统介绍了斜拉空间桁架竖向地震反应的分析理论与方法、详细分析了斜拉空间桁架结构在静力和竖向地震作用下的受力性能，主要内容包括：利用通用有限元软件ANSYS9.0计算了斜拉空间桁架在静力和竖向地震作用下内力及自由端位移分布规律并得出地震内力系数与节间位置、预应力以及斜拉索高度之间的函数关系；详细分析了斜拉索中施加的预应力以及斜拉索高度的变化对于该种结构内力及自由端位移的影响并提出了斜拉空间桁架的临界预应变概念，进而得到了自由端位移与初始预应变以及斜拉索高度的函数关系，即：△=-(40h+2180)ε+9.8；分析了该种结构的动力性能，并指出：在时域内采用直接积分法计算该种结构的动力响应时，应该考虑采用不引起振幅率减小的Newmark-β法，以保证高阶模态响应的贡献仍然保留在响应中而不致于被忽略。

A mean strain or prestrain, as in Fig. 83, can under certain conditions reduce the subsequent fatigue life.

一个如图83所示的平均应变或预应变，在某种情况下，能够缩短以后的疲劳寿命。

A mean strain or prestrain, as in Fig.

一个如图83所示的平均应变或预应变，在某种情况下，能够缩短以后的疲劳寿命。

At last,the effect of the prestrained geotextiles on the stability of the embankment was analyzed through calculation,thus the importance was shown of the prestrain in construction.

还通过计算，分析了机织土工布的预应变对路基稳定性的影响，从而说明施工加筋砂垫层时，对加筋材料施加预应变的重要性。

The recovery stress rate of the TiNi alloy increases with increasing prestrain level, but that of the TiNiCu alloy decreases with increasing prestrain level.

对于TiNi合金，回复力随温度增长的速率随着预应变的增加而增加，而TiNiCu合金的回复力随温度增长的速率随着预应变的增加而减小。

The conclusions are summarized as follows. Effects of prestrain on the reverse martensitic transformation of TiNi fibers have been studied.

逆相变热焓随着预应变的增大而升高，当预应变为7%左右时达到最大值，然后随着预应变的进一步增大而降低。

Phase transformation and incomplete phase transformation behaviors of TiNi shape memory alloy within small prestrain level (＜10％) were studied by DSC and recovery strain measurements.

采用DSC方法和回复应变的测量，对小预应变（＜10％）TiNi形状记忆合金的相变及不完全相变行为进行了研究。

The results show that the reverse martensitic transformation start temperature increases with the increase of prestrain, which may be due to the elastic energy released by prestrain, and the energy dissipated increased by plastic deformation and the constrain effects of grains.

结果表明，逆相变开始温度随预应变增加而增大，其原因是预应变造成马氏体再取向使弹性能降低，引起的塑性变形和晶粒间的约束提高了耗散能。

With the above instruments, the effects of strain－rate history on the constitutive relations of the above two materials were also firstly investigated at different temperatures and prestrain rates and it is found that strain－rate history strengthen them and their strength under reloading increases with increasing prestrain rate.

研究表明，应变率历史对这两种材料均具有强化作用，其二次加载下的强度随预应变率的升高而提高，它们对应变率历史的敏感性则随温度的升高而降低。

Effects of prestrain on the constrained reverse martensitic transformation of TiNi fibers embedded in the aluminum matrix have been studied.

若TiNi合金处于马氏体状态时预应变，则DSC加热曲线上出现一个吸热峰，其面积随着预应变的增大而减小，其开始结束温度随着预应变的增大而升高。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了