结构断裂强度研究的切线模量因子法  

Examination of Structural Fracture Strength by Tangent Modulus Factor

作　　者：戴光[1,2] 刘康林[1,2] 齐文浩 

机构地区：[1]大庆石油学院石油机械系 [2]大庆石油管理局油田化工总厂

出　　处：《大庆石油学院学报》1999年第2期53-56,共4页Journal of Daqing Petroleum Institute

基　　金：黑龙江省自然科学基金

摘　　要：利用切线模量因子和强度利用率函数的概念，建立了含裂纹结构的弹塑性临界断裂应力的切线模量因子算法（Φｋ法）．该算法是根据材料的拉伸应力应变曲线，由强度利用率函数和线弹性断裂理论，确定结构的弹塑性断裂应力，无需用到复杂的弹塑性断裂理论，便于工程应用．通过实验资料验证了该方法的可行性与有效性。The thesis focuses on the investigation of application of tangent modulus factor and strength utilization ratio function (SURF)to solution of structural fracture strength problems. A new computation method of elastic\|plastic fracture stress, cr,is developed. Using this approach, calculation of cr may be summarized into the solution of linear elastic fracture stress and SURF according to stressstrain curve of the material in question. Values of X-]crcalculated by this approach are in agreement with experimental results. In the assessment of integrity of structures with defects, the failure assessment diagrams (FAD) based on curves of crk and K crk are presented. They are equivalent to R6 curve. The computation method presented in this paper is simpler than COD and Jintegral approaches in elasticplastic fracture theory and convenient for engineering application.

关 键 词：切线模量因子 强度利用率函数 断裂应力 结构 

分 类 号：TB303[一般工业技术—材料科学与工程] O346.1[理学—固体力学]