Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-

Most cold forming processes are perceived as simple surface treatments without a heating process and are widely used to improve the fatigue strength of various engineering components. The method for measuring the residual stresses caused by such surface treatment is very important when evaluating th...

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Autores principales:	Mariko MATSUDA, Keisuke OKITA, Tomokazu NAKAGAWA, Toshihiko SASAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	residual stress inherent strain finite element method x-ray stress measurement cosα method cold forming process Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/730d3a63cd3243f5a7a349997d0e8699
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spelling	oai:doaj.org-article:730d3a63cd3243f5a7a349997d0e86992021-11-26T07:11:27ZApplication of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-2187-974510.1299/mej.17-00022https://doaj.org/article/730d3a63cd3243f5a7a349997d0e86992017-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00022/_pdf/-char/enhttps://doaj.org/toc/2187-9745Most cold forming processes are perceived as simple surface treatments without a heating process and are widely used to improve the fatigue strength of various engineering components. The method for measuring the residual stresses caused by such surface treatment is very important when evaluating the fatigue strength of engineering components. The inherent strain method is one of the most effective measures for predicting the internal residual stress distribution. The residual stresses within a body are caused by internal permanent strains known as inherent strain or eigenstrain. In the case of cold formed components, the inherent strains are induced by plastic deformation. If a component is cut, the residual stress distribution changes, but the inherent strains of the original shape before cutting are preserved. The inherent strains are predicted by the inverse analysis of a finite element model using the measurement results of residual stresses on the slice or the cut surface of a body. On the other hand, a two-dimensional X-ray diffraction system based on a cosα method is useful for measuring the residual stresses because of its compactness and higher measurement speed than the conventional sin2Ψ method. In this paper, we propose an efficient approach that combines the inherent strain method and an X-ray stress measurement along with a new measurement procedure for the fillet portion of an axisymmetric shaft with a flange after the cold forming process. This report compares the results estimated using the inherent strain method by the sin2Ψ and cosα methods, and confirms that the differences in the results were very small. Furthermore, three advantages of the cosα method—wider measurable area, shorter measurement time, and shear stress measured at the same time as normal stress—are examined. Consequently, it is verified that the cosα method is effective for the proposed new approach.Mariko MATSUDAKeisuke OKITATomokazu NAKAGAWAToshihiko SASAKIThe Japan Society of Mechanical Engineersarticleresidual stressinherent strainfinite element methodx-ray stress measurementcosα methodcold forming processMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00022-17-00022 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	residual stress inherent strain finite element method x-ray stress measurement cosα method cold forming process Mechanical engineering and machinery TJ1-1570
spellingShingle	residual stress inherent strain finite element method x-ray stress measurement cosα method cold forming process Mechanical engineering and machinery TJ1-1570 Mariko MATSUDA Keisuke OKITA Tomokazu NAKAGAWA Toshihiko SASAKI Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
description	Most cold forming processes are perceived as simple surface treatments without a heating process and are widely used to improve the fatigue strength of various engineering components. The method for measuring the residual stresses caused by such surface treatment is very important when evaluating the fatigue strength of engineering components. The inherent strain method is one of the most effective measures for predicting the internal residual stress distribution. The residual stresses within a body are caused by internal permanent strains known as inherent strain or eigenstrain. In the case of cold formed components, the inherent strains are induced by plastic deformation. If a component is cut, the residual stress distribution changes, but the inherent strains of the original shape before cutting are preserved. The inherent strains are predicted by the inverse analysis of a finite element model using the measurement results of residual stresses on the slice or the cut surface of a body. On the other hand, a two-dimensional X-ray diffraction system based on a cosα method is useful for measuring the residual stresses because of its compactness and higher measurement speed than the conventional sin2Ψ method. In this paper, we propose an efficient approach that combines the inherent strain method and an X-ray stress measurement along with a new measurement procedure for the fillet portion of an axisymmetric shaft with a flange after the cold forming process. This report compares the results estimated using the inherent strain method by the sin2Ψ and cosα methods, and confirms that the differences in the results were very small. Furthermore, three advantages of the cosα method—wider measurable area, shorter measurement time, and shear stress measured at the same time as normal stress—are examined. Consequently, it is verified that the cosα method is effective for the proposed new approach.
format	article
author	Mariko MATSUDA Keisuke OKITA Tomokazu NAKAGAWA Toshihiko SASAKI
author_facet	Mariko MATSUDA Keisuke OKITA Tomokazu NAKAGAWA Toshihiko SASAKI
author_sort	Mariko MATSUDA
title	Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
title_short	Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
title_full	Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
title_fullStr	Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
title_full_unstemmed	Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-
title_sort	application of x-ray stress measurement for residual stress analysis by inherent strain method - comparison of cosα and sin2ψ method-
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/730d3a63cd3243f5a7a349997d0e8699
work_keys_str_mv	AT marikomatsuda applicationofxraystressmeasurementforresidualstressanalysisbyinherentstrainmethodcomparisonofcosaandsin2psmethod AT keisukeokita applicationofxraystressmeasurementforresidualstressanalysisbyinherentstrainmethodcomparisonofcosaandsin2psmethod AT tomokazunakagawa applicationofxraystressmeasurementforresidualstressanalysisbyinherentstrainmethodcomparisonofcosaandsin2psmethod AT toshihikosasaki applicationofxraystressmeasurementforresidualstressanalysisbyinherentstrainmethodcomparisonofcosaandsin2psmethod
_version_	1718409725206331392

Application of X-ray stress measurement for residual stress analysis by inherent strain method - Comparison of cosα and sin2Ψ method-

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