Residual Stress Analysis of Strongly Textured Materials by Means of the Incremental Hole-Drilling Method – Survey on the Application Limits

Simone Schuster; Jens Gibmeier

doi:10.3139/120.110651

Article

Residual Stress Analysis of Strongly Textured Materials by Means of the Incremental Hole-Drilling Method – Survey on the Application Limits

Simone Schuster and Jens Gibmeier

Published/Copyright: November 20, 2014

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From the journal Materials Testing Volume 56 Issue 11-12

Abstract

In sheet metal forming, residual stress distributions are often accompanied by crystallographic texture. Incremental hole-drilling for stress analysis is only reliably applicable for isotropic materials. The objective of this study is to determine the influence of texture on residual stress analysis using conventional evaluation methods and to specify the application limits in case of textured material states. A systematic finite element simulation study for ideal texture orientations is conducted with respect to the strain gage rosette orientation. The results of the numerical investigations show that reliable stress analysis on strongly textured materials is not feasible using the existing evaluation method. The application limits are given for the application of commercially available evaluation software with respect to degree of anisotropy, stress state and strain gage orientation.

Kurzfassung

In der Blechumformung werden Eigenspannungsverteilungen oft von kristallographischer Textur begleitet. Das inkrementelle Bohrlochverfahren zur Spannungsanalyse ist nur für isotrope Materialien zuverlässig anwendbar. Das Ziel dieser Studie ist es, den Einfluss der Textur auf die Eigenspannungsanalyse mit herkömmlichen Bewertungsmethoden zu bestimmen und die Einsatzgrenzen im Falle von strukturierten Werkstoffzuständen zu spezifizieren. Eine systematische Studie mittels Finite-Elemente-Simulation für ideale Texturorientierungen unter Berücksichtigung der Ausrichtung der DMS-Rosette wurde durchgeführt. Die Ergebnisse der numerischen Untersuchungen zeigen, dass eine zuverlässige Spannungsanalyse an stark texturierten Materialien unter Verwendung der vorhandenen Auswerteverfahren nicht möglich ist. Es werden die Einsatzgrenzen für die Anwendung von handelsüblicher Auswertesoftware in Bezug auf den Grad der Anisotropie, den Spannungszustand und die DMS-Orientierung angegeben.

Keywords: Residual stress; hole-drilling method; texture; anisotropy

*Correspondence Address, Simone Schuster, Karlsruhe Institute of Technology, Institute for Applied Materials, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany. E-mail: simone.schuster@kit.edu

Dipl.-Ing. Simone Schuster, born 1985, studied Mechanical Engineering at the Karlsruhe Institute of Technology, Germany, from 2005 to 2011. Since 2011, she is working as a scientific assistant at the Institute for Applied Materials – Materials Science in the group of structure and stress analysis. In 2012, she became a member of the Graduate School 1483, working in the field of residual stress analysis of strongly textured materials.

Dr.-Ing. Jens Gibmeier studied Mechanical Engineering at the University of Kassel, Germany. There, he finished his doctor's degree at the Institute of Materials Engineering – Metallic Materials in 2004 on the subject “On the effect of loading and residual stresses on the results of instrumented hardness testing”. From 2006 to 2008 he was Research Associate at Hahn-Meitner-Institute Berlin, which is now the Helmholtz Zentrum Berlin, Germany, and worked as the responsible beamline scientist at the materials research synchrotron beamline EDDI at the synchrotron storage ring BESSY II. Since 2008, he is a senior scientist at the Institute of Applied Materials (formerly: IWK I) of the Karlsruhe Institute of Technology (KIT) and heads the section “Structure and Stress Analysis”.

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Published Online: 2014-11-20

Published in Print: 2014-11-17

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https://doi.org/10.3139/120.110651

Keywords for this article

Residual stress; hole-drilling method; texture; anisotropy