| 摘要: |
| 为了研究材料初始缺陷对其力学行为的影响，针对三元乙丙(EPDM)包覆层材料进行准静态力学实验，并且采用统计学方法对实验结果进行分析，获取以随机损伤参数函数表示的有效实验结果的分布规律，通过引入随机损伤参数函数扩展Ogden模型，建立能够描述EPDM初始缺陷的本构方程。结果表明:实验结果以94%的概率落入该扩展模型所估计的置信程度为90%的置信区间，该模型对于考虑初始缺陷的EPDM包覆层材料的力学行为预测结果较好。 |
| 关键词: 初始缺陷 随机变量 统计规律 本构模型 单轴拉伸 三元乙丙 |
| DOI： |
| 分类号: |
| 基金项目:高能聚合物冲击载荷下热-力耦合模型研究(BK20140772)。 |
|
| Random Statistical Regularity of Initial Damage in Application of Constitutive Model of EPDM |
|
ZHANG Zhong-shui,XU Jin-sheng,CHEN Xiong,JIANG Jing
|
|
(School of Mechanical Engineering，Nanjing University of Science and Technology，Nanjing 210094，China)
|
| Abstract: |
| In order to study the impact of initial damage of the material on the mechanical properties，quasi-static mechanical tests of EPDM were conducted and the distribution regularity of effective test results was obtained by analyzing the test results statistically. A constitutive model which is capable of expressing the initial defects of EPDM was built by introducing the random damage variable to Ogden model. The test results fall in a confidence interval with a confidence level of 90% estimated by the extended model，with a probability of 94%. The proposed model has excellent estimation results for mechanical properties of EPDM inhibitor with initial defects. |
| Key words: Initial defect Random variable Statistical regularity Constitutive model Uniaxial tension EPDM |
