Finite Element Analysis of Calibration Coefficients for Residual Stress Measurements by the Ring Core Procedure

Lianyong Xu; Hailun Zhao; Hongyang Jing; Yongdian Han

doi:10.3139/120.110652

Article

Finite Element Analysis of Calibration Coefficients for Residual Stress Measurements by the Ring Core Procedure

Lianyong Xu , Hailun Zhao , Hongyang Jing and Yongdian Han

Published/Copyright: November 20, 2014

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From the journal Materials Testing Volume 56 Issue 11-12

Abstract

Finite element analysis (FEA) and experiments have been conducted to analyze the calibration coefficient for measuring residual stress in the ring core method. In this publication, firstly, the calibration coefficients were determined using FEA. Then, factors which affect the calibration coefficients were investigated, such as the tensile load applied to the components, the geometric sizes of the annular grove and the location of the strain gage. The results of FEA were consistent with the experimental results. The most appropriate geometric sizes of the annular groove and location of the strain gage were obtained. This study also defines the distortion energy parameter S to calculate and modify the calibration coefficients. Hence, it is reasonable to apply FEA to calibration coefficients in the ring core method.

Kurzfassung

Es wurden Finite-Elemente-Analysen (FEA) und Versuche durchgeführt, um die Kalibrationskoeffizienten für die Eigenspannungsmessung bei der Ringkernprozedur zu bestimmen. Im vorliegenden Beitrag wird erstmalig die Bestimmung der Kalibrationskoeffizienten mittels FEA vorgestellt. Danach wurden die Faktoren untersucht, die die Kalibrationskoeffizienten beeinflussen, wie beispielsweise die Zugbeanspruchung der Komponenten, die geometrischen Abmessungen der Ringnut und die Platzierung der Dehnungsmessstreifen. Die Ergebnisse der FEA sind konsistent mit den experimentellen Resultaten. Die am besten geeigneten geometrischen Abmessungen der Ringnut und die Platzierung der Dehnungsmessstreifen wurden ermittelt. Der vorliegende Beitrag definiert außerdem den Distorsionsenergieparameter S für die Berechnung und Modifizierung der Kalibrationskoeffizienten. Somit ist es sinnvoll, die FEA auf die Kalibrationskoeffizienten bei der Ringkernprozedur anzuwenden.

Keywords: Materials testing; calibration coefficient; ring-core procedure; residual stress; finite element analysis

*Correspondence Address, Dr. Yongdian Han, Tianjin Key Laboratory of Advanced Joining Technology, School of Material Science and Engineering, Weijin Road 92, Tianjin University, Tianjin 300072, P.R. China. E-mail: hanyongdian@tju.edu.cn

Assoc. Prof. Dr. Lianyong Xu, born 1975, graduated in 2004 with a MSc from the School of Material Science and Engineering, Tianjin University, China. He continued studying at the same faculty and received his PhD in 2007. Currently, he is Associate Professor and Researcher at the same faculty. His main research areas are welding mechanics, welding residual stress, deformation control and finite element analysis of welding joints, integrity and life assessment of welded structures under high temperature as well as environmental corrosion evaluation of welding joints.

Hailun Zhao, born 1989, graduated in 2012 with a BSc from the School of Material Science and Engineering. Tianjin University, China. He continued studying at the same faculty in September 2012. He works as a student at the School of Mechanical Engineering. His main research areas are residual stress testing and evaluation of welding joints and turbine rotors. He also studies the methods for residual stress measurements, including the ring core method, the hole-drilling method and the indentation method.

Prof. Dr. Hongyang Jing, born 1966, graduated in 1988 with a MSc from the School of Mechanical Engineering, Tianjin University, China. He continued studying at the same faculty and became Doctor of Science in 1993. He is Professor and Researcher at School of Mechanical Engineering, Tianjin University. His main research areas are construction and materials interconnect technology, life prediction and extension of welding structures. He also studies welding structures' creep, fracture and fatigue behavior assessments under high or low temperature, corrosion and other complex environments.

Dr. Yongdian Han, born 1983, graduated in 2007 with MSc from the School of Material Science and Engineering, Tianjin University, China. He continued studying at the same faculty and received his PhD in 2010. He is Researcher at the School of Material Science and Engineering, Tianjin University. His main research areas are technology and reliability of electronic packaging materials, welding structures' corrosion as well as fatigue and fracture behavior assessments.

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Published Online: 2014-11-20

Published in Print: 2014-11-17

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https://doi.org/10.3139/120.110652

Keywords for this article

Materials testing; calibration coefficient; ring-core procedure; residual stress; finite element analysis