ESSENTIAL WORK OF FRACTURE AND J-INTEGRAL MEASUREMENTS FOR DUCTILE POLYMERS
ESSENTIAL WORK OF FRACTURE AND J-INTEGRAL MEASUREMENTS FOR DUCTILE POLYMERS
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DOI：
10.1002/polb.1991.090290702
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发表时间：
1991-06-01
影响因子：
--
通讯作者：
POWELL, P
中科院分区：
文献类型：
--
作者：
MAI, YW;POWELL, P
在韧性撕裂的聚合物，颈部之前失败，它表明，特定的基本断裂工作（W（E）），包括在形成和撕裂的颈部耗散的能量，是一种材料的属性，对于一个给定的片材厚度，是独立的试样的几何形状。 断裂实验的工作，使用双深边缺口（DENT）和深中心缺口张力（DCNT）的几何形状与不同的韧带长度产生几乎相同的w（e）值的一个等级的高密度聚乙烯。 这些w（e）的测量值与基于沿沿着裂纹尖端附近颈部周围轮廓估算的J积分的理论值相当吻合。 在J控制的裂纹扩展条件下，由J（R）曲线外推到零裂纹扩展得到的J（c）和斜率dJ/da分别与由断裂比总功（w（f））和韧带长度（l）之间的直线关系得到的w（e）和4-β-w（p）相同。
In the ductile tearing of polymers that neck before failure it is shown that the specific essential fracture work (w(e)), consisting of the energies dissipated in forming and tearing the neck, is a material property for a given sheet thickness and is independent of specimen geometry. Work of fracture experiments using both double deep-edge notched (DENT) and deep-center notched tension (DCNT) geometries with different ligament lengths yielded almost identical w(e) values for a grade of high-density polyethylene. These measurements for w(e) are in fairly good agreement with the theoretical values based on the J integral evaluated along a contour surrounding the neck region near the crack tip. Under J-controlled crack growth conditions, it is shown that J(c) obtained by extrapolation of the J(R) curve to zero crack growth and the slope dJ/da are identical, respectively, to w(e) and 4-beta-w(p) obtained from the straight line relationship between the specific total work of fracture (w(f)) and ligament length (l).