船舶构件共线多裂纹应力强度因子研究

船舶构件中除了单个形式存在的裂纹外,还有多个裂纹同时存在的情况。多裂纹之间的相互干扰作用使得问题远比单裂纹复杂。本文采用比较简单直观的组合法对平板表面多裂纹的应力强度进行了求解并与FRANC 3D求解的结果比较,两者结果较接近,由此可见组合法可以适应工程要求。因此,在平板表面多裂纹问题求解的基础上,推出了T型构件焊趾处表面多裂纹应力强度因子求解的表达式,从而使T型构件多裂纹复杂问题转化为较简单的平板多裂纹问题,可以为工程计算方法提供参考。

Study on Stress Intensity Factors of Ship Structure with Collinear Cracks

Not only the single crack but also multiple cracks may exist in the ship structure.The problem of multiple cracks is more complex than that of single crack because of the interference of cracks.A simple combined approach is adopted to solve the stress intensity factor of multiple collinear surface cracks in plate.Results from comparison indicate that the combined approach can agree with the FRANC 3D,and meet the requirements in engineering.Based on the multiple cracks on the plate surface,a method for calculating the stress intensity factor of the T-butt joint with the collinear multiple surface crack is proposed.So the complex problem about the T-butt joint can be transformed into the simple problem of plate.This method can be the reference for the engineering calculation.