3D Analysis of Amorphous Polymers Deformation under Mode I

机译：I模式下非晶态聚合物变形的3D分析

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Fracture in ductile glassy polymers is usually preceded by noticeable and extensive plastic deformation,as shear yielding takes place in the form of shear bands that are limited by progressive hardening of materials at continuous deformation.In the case of a notched specimen,this induces a noticeable crack blunting before the failure.We use a constitutive law that captures realistically the stress-strain fields of solid glassy polymers.In particular,we account for a rate dependent yield stress followed by intrinsic softening and progressive hardening at continued deformation.We analyzed the 3D crack tip fields around a blunted notch loaded under mode I.With an increasing ratio between thickness versus notch tip radius,the shape of crack tip area evolves from a flame like zone characteristic of plane stress conditions to slip lines when plan strain conditions prevail.For a constitutive law representing the response of polycarbonate,we identified a critical thickness vs notch radius value that indicates the transition between plane stress to plane strain dominant loading conditions.The implication for the geometry necessary to derive material toughness experimentally is pointed out and an examination of the mean stress constraint related to the onset of failure by crazing is reported.

机译：易延展的玻璃态聚合物的断裂通常先引起明显的大范围塑性变形，因为剪切屈服以剪切带的形式发生，受连续变形时材料逐渐硬化的限制。在带缺口的试样中，这会引起明显的塑性变形。裂纹在破坏之前变钝。我们使用本构定律，可以真实地捕获固体玻璃状聚合物的应力-应变场。特别是，我们考虑了速率依赖性屈服应力，然后在连续变形时进行了固有的软化和渐进硬化。我们分析了3D在模式I下加载的钝化缺口周围的裂纹尖端场。随着厚度与缺口尖端半径之间的比率增加，裂纹尖端区域的形状从平面应力条件下的火焰状区域特征演变为平面应变条件下的滑移线。代表聚碳酸酯响应的本构定律，我们确定了临界厚度与缺口半径值e表示平面应力到平面应变主导载荷条件之间的过渡。指出了通过实验得出材料韧性所必需的几何形状，并报道了与开裂有关的平均应力约束的检查。

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《International conference on fracture》|2013年|1-10|共10页
会议地点 Beijing(CN)
作者
Shu Guo; Rafael Estevez; Sabine Weygand; Christian Olagnon;
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作者单位

MATEIS INSA Lyon 69621 France;

SIMAP Université de Grenoble 38401 France;

University of Applied Science HS Karlsruhe 76133 Karlsruhe Germany;

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关键词
crack tip plasticity; fracture; glassy polymers; 3D effects;

机译：裂纹尖端塑性断裂;玻璃状聚合物； 3D效果;

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3D Analysis of Amorphous Polymers Deformation under Mode I

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