注塑件残余应力的测试方法

注塑制品的残余应力影响制品的形状、表面质量及使用性能。测试并研究残余应力对改进成型条件、提高产品质量、降低废品率意义重大。介绍4种残余应力的测试方法，包括无损测试的双折射法、X射线衍射法和有损测试的剥层法、钻孔法、应力松驰法。叙述了不同测试方法的测试原理、计算方法等，评述了各种测试方法的优缺点。

MEASURING METHOD OF THE RESIDUAL STRESS OF THE INJECTION PLASTIC PARTS

The residual stress in the injection plastic parts heavily affects the shape, the surface quality and the usage capacity of the product. The research and measurement of the residual stress are very important to improving the conditions of the injection molding and the products quality. Four measurement methods are introduced including Non-destructive method(Birefringence Method) and destractive method( Layer Removal Technique, Hole Drilling Method,Stress Relaxatiion Method). The measurement principles and calculation methods are also described. The advantage and disadvantage of each method are estimated.