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research-article

Visualization of Thermal Fatigue Damage Distribution with Simplified Stress Range Calculations

[+] Author and Article Information
Junya Miura

Toyo University, Graduate School of Science and Engineering, Course of Advanced Mechatronics Systems, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
s36a01700082@toyo.jp

Terutaka Fujioka

Mem. ASME, Toyo University, Faculty of Science and Engineering, Department of Mechanical Engineering, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
fujioka@toyo.jp

Yasuhiro Shindo

Toyo University, Faculty of Science and Engineering, Department of Mechanical Engineering, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
shindo060@toyo.jp

1Corresponding author.

ASME doi:10.1115/1.4041057 History: Received November 09, 2017; Revised July 11, 2018

Abstract

This paper proposes simplified methods to evaluate fatigue damage in a component subjected to cyclic thermal loads to visualize damage distribution by using typical CAE systems. The objective is to perform the evaluations on a standard desktop PC within a reasonably short computation time. Three simplified methods for defining elastic stress ranges are proposed in place of the method in the ASME Subsection NH procedures. A thermal fatigue test that was previously performed using a type-304 stainless steel (304SS) cylinder is simulated to validate the proposed methods. Heat transfer and elastic analyses are conducted. Simultaneously with the analyses, fatigue usage factors are calculated using user subroutines formulated in this study, including the three simplified methods and the ASME NH-based method. The calculated values of the fatigue usage factor are visualized using a graphical user interface (GUI) incorporated into a commercial finite-element analysis (FEA) code. The fatigue usage factor distribution obtained using the simplified methods could be calculated without requiring large amounts of memory and long computation time. In addition, the distribution of the fatigue usage factor was consistent with the distribution of cracks observed in the test.

Copyright (c) 2018 by ASME
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