摘要
采用CTS试样研究Ⅰ/Ⅱ混合型断裂特性计算裂纹前缘应力强度因子时可采用解析公式,一旦裂纹发生扩展,解析公式便不再适用。文中采用有限元法研究紧凑拉伸剪切(CTS)试样在Ⅰ/Ⅱ平面混合型加载下的裂纹扩展行为。采用ANSYS建立CTS试样Ⅰ/Ⅱ混合型测试系统有限元模型,为模拟真实受力状态,在CTS试样—销—扇型夹具以及扇型夹具—销—U型夹具之间分别建立接触对进行接触力学分析。通过与解析公式结果进行对比验证了该数值方法的可靠性,采用最大环向应力准则(MTS),模拟了CTS试样不同加载角度下的裂纹扩展路径,获得了裂纹扩展路径中应力强度因子随裂纹长度的变化曲线,解释了裂纹扩展路径不与外载荷方向垂直的原因,并给出了CTS试样偏折裂纹应力强度因子解析公式。
The closed-form SIFs solutions of compact tension shear(CTS) specimen are used to investigate the mixed-mode Ⅰ/Ⅱ fracture behavior, but they are not applicable for the deflected crack.In this study, three dimensional fracture analyses of CTS specimen for mixed-mode Ⅰ/Ⅱ loading are performed using finite element method(FEM). To simulate the real conditions, the contacts between the contact surfaces of the loading device, specimen and the pins are defined. Comparison between the FEM results and the solutions for SIFs of CTS specimen was done for verification of the proposed simulation method. The crack growth paths of the CTS specimen for all loading angles are simulated following the MTS criterion. The SIFs of the crack front with the crack growth length were given, and the reason of the crack growth paths not perpendicular with the direction of the traction force was found. Finally, the closed-form SIFs solutions for the deflected crack of CTS specimen were proposed, which can be used for the mixed mode Ⅰ/Ⅱ fracture behavior research.
作者
黄如旭
万正权
HUANG Ru-xu;WAN Zheng-quan(China Ship Scientific Research Center,Wuxi 214082,China;State Key Laboratory of Deep-sea Manned Vehicles,Wuxi 214082,China)
出处
《船舶力学》
EI
CSCD
北大核心
2018年第12期1527-1539,共13页
Journal of Ship Mechanics
基金
Supported by the Navy Equrpment Pre-research Project(No.3020503010101)
