ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The railway carbody structure for commuter and suburban train services in Japan is oftenmade of austenitic stainless steel, which is used in the form of thin metal sheets manufactured by coldrolling. Spot welding and laser welding at lapped joints are used in the construction of such carbodies,but it is difficult to observe the strain distribution around these weld zones, which represent thecritical area of the body structure’s strength. The objective of this study is to ascertain the straindistribution in the stainless steel around the weld zone of the carbody structure. To enable observationof this distribution, a strain scanning method using high-energy synchrotron radiation was appliedto the strain measurement of austenitic stainless steel. The transmission method was applied inorder to observe the internal weld zone. Using this method, we can measure the strain distributionfrom the surface to the inside of the weld zone. A lapped joint specimen, prepared by welding2-mm-thick plates using the laser welding method, was used for measurement. Austenitic stainlesssteel generally poses problems in the measurement of strain due to its coarse grain and crystal texture.The gage volume in this measurement had a width of 3 mm and a height of 0.15 mm. The measurementprovides the strain distribution of both residual strain and strain under loading, and theresults obtained successfully show the distribution of strain in the weld zone. In addition, the differingtendency between the distribution of residual strain and that of strain under loading is clarified.The full width at half maximum (FWHM) value shows a difference between the tendency of themeasured value of the weld zone and that of the base material
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.321.pdf
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