Study on Strength Distribution and Failure Probability for IG-110
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摘要: 石墨作为一种脆性材料,其强度较为分散。相比较于确定论方法,概率论方法更适合于评价石墨材料的强度。在概率论方法中,失效概率采用的分布函数对结果准确性有较大影响。目前对于石墨材料的强度拟合大都采用威布尔分布,然而对于一些情况,如多轴应力、有残余应力等,威布尔分布并不一定适合。本文以IG-110拉伸、压缩、弯曲大量强度实验数据为基础,首先研究了正态、对数正态以及威布尔分布对实验数据的拟合度,随后采用3种分布计算失效概率,研究不同分布对失效概率方法的影响。Abstract: As brittle material,graphite has scattered strength.Probabilistic method is more appropriate to evaluate the failure of graphite than deterministic method.The distribution function used in probabilistic method has big influence on results.Weibull distribution is commonly applied in the strength fitting.However,in some situations like multi stress and residual stress Weibull distribution is not suitable.The study of the applicability of different distribution on brittle materials is not much.Therefore,this paper uses a large amount of strength tests data to study the fitness of normal,lognormal and Weibull distribution.Also,the influence of distribution on probabilistic method has been studied.
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Key words:
- Graphite /
- Probabilistic method /
- Failure probability /
- Strength distribution
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