JOURNAL ARTICLE
扩展裂纹尖端弹塑性场的仿真模拟
Year: 1994 Journal: Science in China Series A-Mathematics Physics Astronomy & Technological Science (in Chinese) Vol: 24 (12)Pages: 1286-1292 Publisher: Science China Press
Abstract
通过对紧凑拉伸试样裂纹扩展实验的有限元仿真模拟以及对中心裂纹试样和三点弯曲试样的精细有限元计算和分析;证实了稳态扩展裂纹尖端附近环形区内应力场三参数J-k_2-Q表征的有效性。研究结果进一步表明:在扩展裂纹尖端附近的环形区域内;因试样几何类型的不同;存在着不同类型的双参数主导区。对紧凑拉伸试样和弯曲裂纹试样;在裂关附近环形区内存在着J-k_2主导区;而对中心裂纹试样;在裂尖附近环形区内则存在着J-Q主导区。在一般情况下;应由J-k_2-Q三参数表征。
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