X-ray high temperature in-situ stress measurement of fiber or powder reinforced plastic materials

用sin^2Ψ方法进行x射线应力测量是检测制成品残余应力的有效工具之一。本文采用x射线应力测量技术对钨纤维增强聚乙烯复合材料的残余应力进行了检测。采用透射衍射法测量聚乙烯基体的残余应力。在残余应力测量之前，估算了构成复合材料基体的高密度聚乙烯（HDPE）的x射线弹性常数。采用传动法的sin^2Ψ图的结果表明，在多种拉伸载荷下，试样具有良好的线性关系。然后对HDPE基体相的残余应力进行了研究。从测量结果来看，HDPE基体在纤维纵向上存在拉伸残余应力，在纤维横向上存在压缩残余应力。

X-ray stress measurement with sin^2Ψ method is one of useful tools to detect residual stresses in manufactured products. In this study, the residual stresses in the tungsten fiber reinforced polyethylene composite were examined by X-ray stress measurement technique. The transmission diffraction method was employed in residual stress measurement of polyethylene matrix. The X-ray elastic constant of high density polyethylene (HDPE) which formed matrix of the composite was estimated before residual stress measurement. The results of sin^2Ψ diagram with transmission method show good linearity under the several tensile loading. After that the residual stresses in the composite were investigated for HDPE matrix phase. From the measurement results, the tensile residual stresses existed in fiber longitudinal direction and compressive ones in transverse direction for HDPE matrix.