| 长屈服平台材料表面裂纹J积分计算的工程估算方法 |
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| 引用本文： | 张选利,张文,隋业龙,王威强.长屈服平台材料表面裂纹J积分计算的工程估算方法[J].青岛科技大学学报,1999(3). |
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| 作者姓名： | 张选利 张文 隋业龙 王威强 |
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| 作者单位： | 青岛化工学院机械工程学院!青岛266042(张选利，张文)，青岛锅炉压力容器检验所!青岛266000(隋业龙)，山东工业大学化工系!济南250000(王威强) |
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| 摘 要： | 利用ＲＯＲ材料三维裂纹数值解，通过拟合长屈服平台材料的真应力－ 应变关系曲线， 给出了表面裂纹Ｊ积分的工程估算值， 并与有限元解作了比较， 结果表明： 多段拟合法与多段幂次法仍然可应用于三维裂纹问题； 由于表面裂纹问题的极限载荷通常远大于二维穿透裂纹的极限载荷， 所以在拟合材料的应力－ 应变曲线时， 不仅要照顾小应变段， 同时也要考虑较大应变段
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| 关 键 词： | 表面裂纹 三维J积分 多段幂次法 工程估算值 |
The Superposition Method of Engineering Fully Plastic Solutions for Long Flat Yield Band Material |
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| Zhang Xuanli,Zhang Wen,Shui Yelong,Wang Weiqiang.The Superposition Method of Engineering Fully Plastic Solutions for Long Flat Yield Band Material[J].Journal of Qingdao University of Science and Technology:Natutral Science Edition,1999(3). |
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| Authors: | Zhang Xuanli Zhang Wen Shui Yelong Wang Weiqiang |
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| Abstract: | Make use of the ROR material three dimension numberical solution, by fitting the material stress strain curves of long flat yield band, we can predict the J integal engineering solution, and compared with the finite element answers, it can be concluded that the J integal engineering estimition method under plane stress or stain conditionscan alse be applied to 3D crack problems except for that the ultimate load of a surface crack is much larger than that of a 2D penertrated crack. Therefore, much attention should be paid to considering both small strain section and long strain section when fitting the material stess strain curves. |
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| Keywords: | surface crack 3D J integal multisegment power law method engineering estimation solution |
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