507 透過法を用いた高分子材料のX線応力測定(OS5-2 回折法による材料評価)

概要

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The residual stresses in high-density polyethylene (HDPE) were measured using an x-ray stress measurement technique. There are two problems associated with this measurement Firstly, the diffraction peaks of the polymer appear in the low 2θ angle region and therefore the measurement accuracy for strains reduces. Secondly, the low 2θ angle region makes it extremely difficult to use the sin^2ψ method. In the present study we tried to use a transmission method for measuring the residual stress in HDPE samples to resolve these problems. The HDPE sample is shaped into thin sheets which have the three kinds of crystallinity degrees. The measured data is fitted with a good linear regression line in a 2θ-sin^2ψ diagram and the gradient of the regression line corresponded to the applied stress. On the other hand, the results of the residual stress measurement are deeply associated with degrees of the crystallinity in the HDPE material. The quantitative estimation of crystallinity degrees in the HDPE material was accomplished by a sink-float method. The residual stress distributions were discussed between micro-residual stresses in the crystal phase of HDPE with the amorphous phase of it. Finally, x-ray elastic constant (XEC) of FIDPE was estimated in these cases.
一般社団法人日本機械学会の論文
2010-10-09