| 基于两步七点拟合法ADB610钢概率疲劳裂纹扩展研究 |
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| 引用本文： | 张天会,李华英,薛彬,王时越,徐人平. 基于两步七点拟合法ADB610钢概率疲劳裂纹扩展研究[J]. 压力容器, 2012, 29(10): 12-15,46 |
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| 作者姓名： | 张天会 李华英 薛彬 王时越 徐人平 |
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| 作者单位： | 1. 云南农业大学 工程技术学院,云南昆明,650201
2. 昆明理工大学,云南昆明,650051 |
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| 摘 要： | 介绍了两步七点递增多项式拟合方法(简称两步七点拟合法)计算一系列相同裂纹长度下成组多个试样的裂纹扩展速率,然后计算一系列相同裂纹长度在不同存活率下的裂纹扩展速率P-a -da/dN和基于Paris公式的裂纹扩展速率表达式P-da/dN-△K.并采用两步七点拟合法计算了广泛应用于压力容器的ADB610钢7个CT试样在一系列相同裂纹长度下的裂纹扩展速率,以及计算了ADB610钢在存活率分别为50％,90％,95％,99％和99.9％的裂纹扩展速率和基于Paris公式的裂纹扩展速率表达式,有助于ADB610钢抗疲劳断裂可靠性的分析研究.
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| 关 键 词： | 存活率 裂纹扩展速率 两步七点拟合 ADB610钢 |
ADB610 Steel Fatigue Crack Propagation Based on Twice Seven Point Fitting |
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| ZHANG Tian-hui , LI Hua-ying , XUE Bin , WANG Shi-yue , XU Ren-ping. ADB610 Steel Fatigue Crack Propagation Based on Twice Seven Point Fitting[J]. Pressure Vessel Technology, 2012, 29(10): 12-15,46 |
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| Authors: | ZHANG Tian-hui LI Hua-ying XUE Bin WANG Shi-yue XU Ren-ping |
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| Affiliation: | 1.Faculty of Engineering and Technology,Yunnan Agriculture University,Kunming 650201,China;2.Kunming University of Science and Technology,Kunming 650051,China) |
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| Abstract: | Twice seven data incremental polynomial fitting method（short for twice seven data fitting） was introduced which can be used to calculate fatigue crack propagation rate of each sample in a series of same crack length.Then fatigue crack propagation rate（P-a-da/dN） and the equations of fatigue crack propagation rate based on Paris（P-da/dN-ΔK） in different probability can be obtained.And twice seven data fitting method was adopted to calculate crack propagation rate of each 7 CT samples of ADB610 steel in a series of same crack length.It was calculated for the crack propagation rate and the equation of crack propagation rate based on Paris of ADB610 steel with probability in 50%,90%,95%,99% and 99.9%. |
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| Keywords: | probability fatigue crack propagation rate twice seven data fitting method ADB610 steel |
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