COMPARISON WITH TWO DATA PROCESSING METHODS ON FATIGUE CRACK GROWTH RATE
COMPARISON WITH TWO DATA PROCESSING METHODS ON FATIGUE CRACK GROWTH RATE
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发表时间：
2003
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通讯作者：
Jia Fayong
中科院分区：
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作者：
Jia Fayong
采用七点增量多项式法和Smith法对20MnHR焊缝和热影响区疲劳裂纹扩展速率的测试数据进行处理，计算裂纹扩展速率和应力强度因子范围，并对测试结果进行对比分析。分析表明，如果试件足够薄，则可以获得裂纹扩展速率的拐点，并且可以安全地使用基于平面应变行为的Paris裂纹扩展定律。而且，在较大的裂纹扩展区，采用七点增量多项式法得到的疲劳裂纹扩展公式比Smith法具有更高的安全系数，因此可以有相当的信心应用于实际焊接结构。
The tested data of fatigue crack propagation rate on weld and heat affected zone of 20MnHR was dealt with seven point incremental polynomial method and Smith method to compute crack growth rate and range of stress intensity factor, tested results was comparatively analyzed. The analyses show that the inflective point of crack growth rate can be obtained if the specimen is sufficiently thin and the Paris crack propagation law based on plane strain behavior can be used safely. Moreover, in the greater crack propagation zone, there is higher safety factor to employ the fatigue crack propagation formulas obtained with seven point incremental polynomial method than with Smith method, thus it could be applied for practical welded structures with considerable confidence.