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A Critical Discussion on the Diffraction-Based Experimental Determination of Residual Stress in AM Parts

Tatiana MishurovaItziar Serrano-MunozTobias FritschAlexander UlbrichtMaximilian SprengelAlexander EvansArne KrommMauro MadiaGiovanni Bruno

出版	ASTM International, 2020
URL	http://books.google.com.hk/books?id=E5J4zgEACAAJ&hl=&source=gbs_api

註釋

As opposed to reviewing results on experimental determination of residual stress by diffraction, this paper discusses the open issues when dealing with residual stress determination in additive manufactured parts, in particular those manufactured with laser powder bed fusion techniques. Three points are addressed in detail: (a) the proper determination of the strain-free reference d 0 , (b) the problem of the determination of the principal axes, and (c) the use of the correct diffraction elastic constants. It is shown that all methods to determine the strain-free reference d 0 suffer from caveats, and care must be taken in evaluating the most suitable for the problem being tackled. In addition, it is shown that, in some systems, the principal axes do correspond to the geometrical axes of the specimen, but this needs to be systematically checked, especially in the case of uni- or bidirectional hatching strategies. Finally, the need to experimentally determine the proper diffraction elastic constants is underlined, especially in the case of strongly textured specimens, which again depends on the deposition strategy.