含扩展裂纹板计及厚度效应的载荷—位移曲线解析闭合解

准确预测长寿命结构在其服役期内的剩余强度,是当前结构设计工程师面临的一个重大课题。而裂纹扩展过程中,精确的载荷—位移曲线将为这一问题的突破提供一种非常高效的方法。为此,在考虑厚度效应的断裂韧度与阻力曲线理论基础上,对含穿透裂纹板在裂纹扩展过程中的载—荷位移曲线进行理论与试验研究。用卡氏定理导出含驻止裂纹试件承受载荷作用时,外部载荷与试件中点挠度的关系表达式。引入计及厚度效应的断裂韧度与阻力曲线理论,导出裂纹扩展时试件中点处载—荷位移曲线的解析闭合解。进行准静载单调加载下的裂纹扩展试验。所得数据与由载荷—位移曲线解析闭合解得到的计算结果基本吻合,充分验证该解析闭合解的有效性。

Analytical Closed Form Solution of Load-displacement Curve for Cracked Plates Considering Thickness Effect of Resistance Curve

At present,accurate prediction of residual strength of long lifetime structure during its service period is an important and difficult problem facing the structural design engineer.A precise load-displacement curve in the process of crack growth will provide a highly effective solution to this problem.For that,based on the fracture toughness and resistance curve theories with thickness effect considered,an investigation of load-displacement curve for a plate with growing crack is made from both theoretical ...