%0 Journal Article
%T RELATIVITY ANALYSIS AND RESEARCH ON THE SURFACE CRACK IN AGING STRUCTURE<br>老龄化结构表面裂纹间相关性分析与研究
%A REN Keliang
%A L Guozhi
%A <br>任克亮
%A 吕国志
%J 力学与实践
%D 2007
%I 
%X When two or more surface cracks are present on an aging structure the structure damage is accelerated. A finite thickness plate under remote tensile surface traction with two semi-elliptical surface cracks of different geometric dimensions and configurations in close vicinity is used as a model. To calculate the effect of vicinity crack on the reference crack, the three-dimensional finite element method is used. Firstly the relation between stress intensity factor, at reference point ($\theta = 0, \pi/2, \pi )$ on reference crack front, with the crack size is obtained through parametric analysis. After getting the stress intensity factor $K$ and $K'$ (where $K$ and $K'$ are the stress intensity factor with and without interaction of the crack in the vicinity respectively) the effect factor $\beta$ of vicinity crack to reference crack is calculated where $\beta =K'/K$. Finally the nonlinear relation is set up between crack dimensions and location with effect factor $\beta$ by Neural Network. The result provides theoretical reference in practice to analyze the aging structure with multiple surface cracks.
%K aging structure
%K multiple cracks
%K finite element method
%K stress intensity factors
%K neural network<br>老龄化结构
%K 多裂纹
%K 有限元方法
%K 应力强度因子
%K 神经网络
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=0BF5C9FB031A532ED0A6D99DC4F6181A&aid=744F3304EA47876C&yid=A732AF04DDA03BB3&vid=771469D9D58C34FF&iid=E158A972A605785F&sid=E514EE58E0E50ECF&eid=9FFCC7AF50CAEBF7&journal_id=1000-0879&journal_name=力学与实践&referenced_num=0&reference_num=5