基于APDL和UIDL联合技术计算三维表面裂纹应力强度因子  

CALCULATION OF 3-D SURFACE CRACK STRESS INTENSITY FACTOR BASED ON APDL AND UIDL

作　　者：车福炎 耿黎明[1] CHE FuYan;GENG LiMing(China Ship Development and Design Center,Wuhan 430064,China)

机构地区：[1]中国舰船研究设计中心,武汉430064

出　　处：《机械强度》2020年第5期1223-1229,共7页Journal of Mechanical Strength

摘　　要：工程上常将裂纹看作是半椭圆表面裂纹。由于建立半椭圆表面裂纹的全裂纹有限元模型并非易事,在应用有限元法求解裂纹的应力强度因子时,常取裂纹模型的1/4进行分析。采用模型分块处理方法,利用Ansys软件,联合APDL和UIDL技术进行二次开发,实现通过简单界面操作建立半椭圆表面裂纹的全裂纹模型,并可将全裂纹模型方便地嵌入到实体结构中。使用该建模方法分别求解了中心半椭圆表面裂纹和斜置半椭圆表面裂纹的应力强度因子,与理论解和文献中的求解结果基本一致。表明使用该二次开发建立的全裂纹模型求得的应力强度因子是准确可靠的。该联合开发的建模功能可以用来求解复杂外载和复杂结构的应力强度因子,对工程实际应用有重要的应用价值。In engineering,cracks are usually regarded as semi-elliptical surface cracks.It is not easy to establish a complete finite element model of a semi-elliptical surface crack,thus a quarter of the crack model is generally used to calculate the stress intensity factor by finite element method.This paper adopts APDL and UIDL technologies for secondary development of ANSYS software,establishes a complete model of semi-elliptical surface crack by simple interface operation with the method of model block processing.Using this method,the stress intensity factors of the central semi-elliptical crack and the oblique semielliptical crack were solved respectively.The results are basically consistent with the theoretical solution and the results in the literature,which shows that it is accurate and reliable to use the complete crack model established by this method to calculate the stress intensity factor.The combined development modeling function can be used to solve the stress intensity factors in complex structures under complex loads,and has important value for practical application of engineering.

关 键 词：半椭圆表面裂纹 应力强度因子 ANSYS二次开发 全裂纹模型 

分 类 号：O346.1[理学—固体力学]