j integral meaning in English
j 积分
Examples
- For the polymer showing time - dependent character in many situations , the viscoelasticity should necessarily be taken into account in the general model . further , as the conventional j integral is no longer valid for hydrothermal materials cases , investigations on new energy - type fracture criter ia are specifically needed
此外，在含湿、热效应的高聚物材料中，传统的粘弹性或弹性材料的断裂判据不再适用，所以，对该问题进行研究也是十分必要的。 - The relationship between j integral of nonlinear elastic double cantilever beam specimens and crack growth rate of nonlinear viscoelastic double cantilever beam specimens is derived . 7 . predictions of theory and results of experiments are compared , and what cause error is discussed
5 、计算了改性聚丙烯双梁对应的回复弹性j积分；得到裂纹扩展速度实验数据与j积分的关系图； 6 、推导了非线性回复弹性双梁j积分与非线性粘弹性双梁裂纹扩展速度的关系式；用理论公式预测了裂纹扩展速度理论值与j积分的关系图； 7 、最后把理论预测和实验结果做了比较。 - The main purpose of this paper is to study crack growth rate of a class of nonlinear viscoelastic materials under the condition of constant load and small - strain . in this paper : the new test program is raised by referencing the existing test programs and by our trial and error ; in the new test program , facilities involved in the nonlinear viscoelastic crack tests are relatively few , the test process is relatively simple and the data obtained from the experiments are credible . on this basic , the calculation of j integral of nonlinear viscoelastic double cantilever beams specimens and the parameter of fracture work of corresponding nonlinear viscoelasticity are derived
具体成果包括： 1 、证实了双悬臂梁试件用于非线性粘弹性裂纹扩展实验研究的优点：双悬臂梁试件在实验中能观测到的扩展过程持续时间比较长，在计算j积分时，计算方法简单； 2 、得到了改性聚丙烯材料用于非线性粘弹性裂纹扩展实验的两种有效的试件构形和相应的试件尺寸；采用不断改善夹具的方法使得加载稳定； 3 、经过连续四个多月的时间得到了一组有用的实验数据； 4 、得到了裂纹长度与时间的关系、裂纹扩展速度与时间的关系、裂纹扩展速度与裂纹长度的关系。