Reliability Methods to Determine Fracture Toughness K1C and Fracture Threshold Value ΔKth
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摘要: 采用定量方程随机化方法,建立了断裂p-JR-Δa曲线方程,断裂p-JR-Δa曲线与钝化线的交点即为试验测定具有可靠度p的J积分临界值(J1C)p值,根据断裂力学测试原理,由试验测定(J1C)p值可转化出断裂韧性(K1C)p值;还建立了断裂门槛ΔKth值的可靠性测定方法,并对试验数据进行了统计分析处理,得到了一些具有重要应用价值的结果和数据.研究发现:断裂门槛值ΔKth服从正态分布.Abstract: According to the randomization method of deterministic equation,fracture p-JR-Δa curve equation is established.From this fracture p-JR-Δa curve and fracture passivation curve,fracture critical value (J1C) p with the reliability level of p may be obtained.By means of fracture testing principle,fracture (K1C)p can be derived from (J1C)p.Then the reliability method to determine fracture threshold value ΔKth is presented.After the treatment of test data,some important results are obtained.From the statistical test,it is validated that fracture threshold value ΔKth follows the normal distribution.
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Key words:
- fracture toughness /
- fracture threshold value /
- reliability
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