Developments of Damage Model and Analytical Tool for Evaluation of Fatigue Strength under Multiaxial Random Loading

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560092
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Ritsumeikan University (2013-2014); University of Fukui (2012)
• Principal Investigator: ITOH Takamoto 立命館大学, 理工学部, 教授 (40242581)
• Co-Investigator(Renkei-kenkyūsha): SAKANE Masao 立命館大学, 理工学部, 教授 (20111130) ; YAMAMOTO Takaei 大分大学, 工学部, 助教 (20295166) ; HIYOSHI Noritake 石川工業高等専門学校, 機械工学科, 講師 (30342489)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 疲労 / 低サイクル疲労 / 多軸応力

Outline of Final Research Achievements

This study presented a simple method of determining stresses and strains and a severity of loading history under non-proportional loadings with defining the rotation angles of the maximum principal stress and strain in a three dimensional stress and strain space. Based on this method, an analytical program for visually presenting the stress/strain state, the non-proportionality of loading, and the damage evaluation was developed. It will be possible for researchers and engineers to assess the fatigue strength under non-proportional loading without requiring special knowledge and judgment about multiaxial loading.

Free Research Field

材料力学