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首页> 外文期刊>International Journal of Solids and Structures >An analysis of thickness effects in the Izod test
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An analysis of thickness effects in the Izod test

机译:艾氏测试中的厚度效应分析

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The Izod impact test is analyzed numerically using a polymer constitutive relation with material parameters qualitatively representative of a polycarbonate. The computations are full 3D transient analyses using explicit time integration and accounting for finite strains. The main purpose of the analyses is a comparison of the stress and strain fields that develop for the various specimen geometries that are used in practice, ranging from a specimen with a square cross-section to a specimen with a width about a quarter of that value. It is shown that the response varies from something close to a plane strain response to something close to a plane stress response. The results illustrate the effect of the stress-strain behavior of polymers, which involves attaining a stress peak, followed by softening and then by the gradual evolution of a very stiff response resulting from increasing network stiffness.
机译:使用聚合物本构关系对伊佐德冲击试验进行数值分析,其材料参数定性地代表聚碳酸酯。该计算是使用显式时间积分并考虑有限应变的完整3D瞬态分析。分析的主要目的是比较实际使用的各种试样几何形状所产生的应力场和应变场,范围从横截面为正方形的试样到宽度约为该值四分之一的试样。结果表明,响应从接近于平面应变响应的变化到接近于平面应力响应的变化。结果说明了聚合物应力-应变行为的影响,其中包括达到应力峰值,然后软化,然后是由于网络刚度增加而产生的非常刚性的响应逐渐演变。

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