Analysis of Residual Stresses in Pistons of Motor Vehicle Engines Using Neutron Diffraction at J-PARC

Tatsumi Hirano; Kishio Hidaka; Daiko Takamatsu; Norikazu Takahashi; Keitaro Shishido; Masato Sasaki; Yuichi Kawashima

doi:10.4028/www.scientific.net/MSF.772.27

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HomeMaterials Science ForumMaterials Science Forum Vol. 772Analysis of Residual Stresses in Pistons of Motor...

Analysis of Residual Stresses in Pistons of Motor Vehicle Engines Using Neutron Diffraction at J-PARC

Abstract:

Internal residual stresses in the pistons of motor vehicle engines were measured to verify the accuracy of residual stresses estimated by thermal simulations. Coarse crystal grains in aluminum casting alloys frequently make it difficult to measure neutron diffraction profiles if a conventional diffractometer is used for steady reactors [1]. Therefore, the Takumi diffractometer installed at the Japan Proton Accelerator Research Complex (J-PARC), which is a pulse neutron source, was applied to measure them. Residual stresses in pistons determined by the method of neutron diffraction were in good agreement with those estimated through thermal simulations. We concluded from these results that the thermal simulations could be applied to designing and producing pistons. Moreover, Young's modulus and Poisson's ratio for aluminum-silicon casting alloy were determined by using neutron diffraction. We also verified that internal residual stresses could be measured with a tensile sample holder by using the Takumi diffractometer.

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Periodical:

Materials Science Forum (Volume 772)

Pages:

27-32

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.772.27

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Online since:

November 2013

Authors:

Tatsumi Hirano, Kishio Hidaka, Daiko Takamatsu, Norikazu Takahashi, Keitaro Shishido, Masato Sasaki, Yuichi Kawashima

Keywords:

Aluminum Casting Alloy, Neutron, Piston, Residual Stress

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