推进技术 ›› 2016, Vol. 37 ›› Issue (6): 1189-1194.

• 材料 推进剂 燃料 • 上一篇    下一篇

初始缺陷的随机统计规律在三元乙丙本构模型中的应用

张中水,许进升,陈 雄,蒋 晶   

  1. 南京理工大学 机械工程学院,江苏 南京 210094,南京理工大学 机械工程学院,江苏 南京 210094,南京理工大学 机械工程学院,江苏 南京 210094,南京理工大学 机械工程学院,江苏 南京 210094
  • 发布日期:2021-08-15
  • 作者简介:张中水 ,女,硕士生, 研究领域为航空宇航推进理论与工程。
  • 基金资助:
    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

  1. School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China,School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China,School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China and School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
  • Published:2021-08-15

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

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