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船用Q235钢裂纹扩展速率试验

DOI: 10.11990/jheu.201407050

Keywords: 裂纹扩展速率, Q235钢, 统计分析, 概率断裂力学, 疲劳断裂, 疲劳可靠性

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Abstract:

针对船体结构疲劳断裂问题,以船用Q235钢为研究对象,开展一系列紧凑拉伸试样裂纹扩展速率试验,分别采用柔度法和图像法测量裂纹长度,应用七点递增多项式法及最小二乘法对试验数据进行拟合回归,并比较2种方法的准确性及稳定性.在对试验数据进行统计特性研究的基础上,得到裂纹扩展参数C、m的统计规律.最后结合概率断裂力学理论,给出不同概率水平下的裂纹扩展速率公式.为进一步研究含裂纹的复杂船体结构裂纹扩展特性及疲劳可靠性提供了理论依据及试验基础.

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