1) theory of yield and stiffness attenuation
屈服及刚度衰减条件
1.
In order to determine the distribution regularity of residual stress in welded beams and plate components,a test method was put forward that was based on the theory of yield and stiffness attenuation.
针对焊接梁板类构件内部残余应力分布规律难以确定的问题,基于屈服及刚度衰减条件,提出了一种测定焊接残余应力分布的试验方法。
2) conditional yield strength
条件屈服强度
1.
The reason and progress of that conditional yield strength by use of titanium for pressure vessels is changed from σr0.
介绍了压力容器用钛所采用的条件屈服强度由原标准σr0。
3) stiffness reduction
刚度衰减
1.
A complete parabolic shear lag analysis containing delamination damage induced by transverse cracks was therefore proposed and applied to predict the stiffness reduction by transverse cracking of materials.
并依此模型对材料刚度衰减进行了计算 ,并与不包含分层损伤的完全抛物线模型及不完全的线模型进行了比较 。
4) stiffness degradation
刚度衰减
1.
A new stiffness degradation model and test methods were introduced.
采用叠层的增量本构关系 ,模拟层合板壳结构的损伤过程 ,建立了损伤后刚度衰减模型及刚度退化准则 ,并通过实验确定了刚度衰减系数。
2.
As an example, the stiffness degradation for cracked(- θ m/90/+θ m ) S laminates is studied.
本文作者对含非正交各向异性铺层的约束开裂复合材料层板，提出用分解刚度的方法建立本构关系；给出分解后耦合问题的控制微分方程；作为特例，研究了（－θｍ／９０ｎ／θｍ）Ｓ开裂层板的刚度衰减。
6) yield condition
屈服条件
1.
The method of determining residual stress by yield condition is discussed, and thecomputational formula of residual stress is set up by Mises yield condition.
论述了应用屈服条件确定残余应力的方法，并用Ｍｉｓｅｓ屈服条件建立了残余应力的计算公式，给出了确定残余应力的程序，对所提出的方法进行了实验验证。
2.
A cosine yield condition for compressible materials under plane stress is proposed in the paper,and equations of characteristic line and stress along it are derived based on the cosine yield condition.
本文提出了可压缩性材料平面应力问题的余弦屈服条件。
3.
Based on theoretical analysis and calculation example,the usual yield conditions in geotechnical engineering are comparatively studied,and such conclusions are drawn:whenever apply different generalized Von Mises conditions to approximate Mohr-Coulomb condition,we should select corresponding generalized Von Mises condition according to the specific problem and its material parameters.
通过对岩土工程中常用屈服条件的理论分析、算例和对比研究,得出如下结论:采用不同的广义Von Mises条件来逼近Mohr-Coulomb条件时,应该根据具体的问题以及材料参数选择相应的广义Von Mises条件;一般情况下的岩土工程问题,采用Drucker-Prager条件似乎偏于保守,真正的逼近Mohr-Coulomb条件应该介于内角圆和外角圆之间;内角圆偏于保守而外角圆偏于危险,等面积圆是相对合适的折中选择。
补充资料：屈服
屈服
yield
屈服yield在外加应力下，材料开始发生不可逆的范性变形的现象。连续加载过程中，应力不增加或开始有所降低而材料如能继续变形，这种材料便具有明显的屈服现象，此时材料所承受的恒定、最大或最小应力分别称为材料的屈服点(飞)、上屈服点(隽u)或下屈服点(asL)。低碳钢及其他含有少量填隙元素的体心立方金属等都具有明显的屈服点:而不锈钢、面心立方金属及密集六角结构金属则无明显的屈服点。对于没有明显屈服现象的材料，很难准确测定它们发生塑性流变的起始点，工程上一般取永久变形值达0.2%时所对应的应力值为该材料的屈服强度，以a02表示。 屈服现象与材料中位错的形成、增殖及运动有关。体心立方金属中位错受到钉扎，不易运动，而且位错的运动速率对应力不敏感，可滑移位错的形成便标志着范性形变的开始，因而具有明显的屈服点。而面心立方金属中位错的运动速率对应力非常敏感，原生位错在低应力下就能运功，使面心立方金属不存在明显的屈服点。 (李宗全)
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条