Effects of loading modes on reliability of cracked structures using FORM and MCS

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• 作者：Ali Delbariani-Nejad ; Saeed Adib Nazari
• 关键词：Failure probability ; FORM ; Loading modes ; Monte carlo simulation ; Reliability ; Stress intensity factor
• 刊名：International Journal of Precision Engineering and Manufacturing
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：18
• 期：1
• 页码：63-76
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering; Materials Science, general;
• 出版者：Korean Society for Precision Engineering
• ISSN：2005-4602
• 卷排序：18

文摘

Studying the reliability of cracked structures under different types of failure modes such as a mixture of Mode I and Mode II loadings has been of great importance in many applications. The purpose of this study is to evaluate the effects of different modes of loading, i.e. pure Mode I, pure Mode II and Mixed mode I/II loadings on the reliability of cracked structures via three typical case studies including 1st: through crack in a very wide plate, 2nd: cracked pressurized fuselage and 3rd: cracked fastener holes under actual geometries and loading conditions using the FORM, the fracture toughness and the equivalent SIF for Mixed mode I/II loading which is extracted by the Energy release rate model 1. The MCS was used to check the accuracy of the FORM. It was found that the failure probability decreases significantly as the loading mode changes from the pure Mode I to pure Mode II. This means that the reliability in the Mixed mode I/II loading is higher than that of pure Mode I and smaller than for pure Mode II. Also, it was concluded that the failure probability decreases with increasing of the angle of crack for the Mixed mode I/II loading conditions. The results indicated that the angle of crack and the applied stress are the two variables which have the most significant influence on the reliability.