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屈服后表面裂纹与穿透裂纹的等效裂纹长度换算
引用本文:唐国金,袁杰红.屈服后表面裂纹与穿透裂纹的等效裂纹长度换算[J].上海力学,2000,21(3):343-349.
作者姓名:唐国金  袁杰红
作者单位:唐国金(国防科技大学航天技术系,长沙,410073);袁杰红(国防科技大学航天技术系,长沙,410073)
摘    要:在较小范围屈服条件下,将D-M模型和弹塑性线弹簧模型相结合,建立了屈服后一般扁壳表面裂纹的计算模型,导出了其控制方程和相应的COD计算公式。在此基础上,提出了屈服后一般扁壳表面裂纹与平板穿透裂纹的等COD换算方法。通过各种影响因素的分析并去除次要因素,最终给出了该等效换算关系的简单拟合公式。计算结果表明,该分析方法简便且有足够的工程精度,适应于在役压力容器等结构的现场快速断裂评定。

关 键 词:断裂  表面裂纹  弹塑性线弹簧模型  等效换算  扁壳  屈服  穿透裂纹
修稿时间:1999年3月1日

The Equivalent Conversion between Yielded Surface Crack and Through Crack
TANG Guo-jin,YUAN Jie-hong.The Equivalent Conversion between Yielded Surface Crack and Through Crack[J].Chinese Quarterly Mechanics,2000,21(3):343-349.
Authors:TANG Guo-jin  YUAN Jie-hong
Abstract:Under the hypothesis of small scale yielding, the calculating model of a surface crack in a general oblate shell is established by combining the D-M model and elastoplastic line spring model, and the governing equation and the mathematical formula of COD are derived. Based on this, the equivalent COD conversion relation between a yielded surface crack in an general oblate shell and a through crack in an infinite plate is derived. By analyzing all kinds of influencing factors and abandoning the subordinate factors, a simple fitting formula of the equivalent COD coversion is presented lastly. The numeric results prove that the method in the paper is simple and has enough engineering analyzing precision, and is the same with the quick fracture assessing of structure such as pressure vessel in service.
Keywords:fracture  suface crack  elastoplastic line spring model  equivalent COD conversion
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