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OALib Journal期刊
ISSN: 2333-9721
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基于扩展有限元法的弹塑性裂纹扩展研究
DOI: 10.3969/j.issn.1671-7627.2014.04.010, PP. 50-57
Keywords: 扩展有限元,裂纹扩展,应力强度因,j积分
Abstract:
为了得到紧凑拉伸(ct)试样应力强度因子和j积分,分别采用传统有限元法、扩展有限元法以及试验方法对其进行计算。在弹性情况下,扩展有限元法和传统有限元法获得的应力强度因子相近,并且与astme1820—05a解相差很小。在弹塑性情况下,扩展有限元法和传统有限元法获得的应力场和j积分有较大的差别,扩展有限元法得到的j积分相对于传统有限元法的结果与实验值更吻合。结果表明:扩展有限元法由于考虑了裂纹扩展,比传统有限元法可以更加准确合理地模拟弹塑性裂纹扩展。
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