THE J-INTEGRAL FRACTURE-TOUGHNESS AND DAMAGE ZONE MORPHOLOGY IN POLYETHYLENES
THE J-INTEGRAL FRACTURE-TOUGHNESS AND DAMAGE ZONE MORPHOLOGY IN POLYETHYLENES
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DOI：
10.1016/0032-3861(91)90424-h
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发表时间：
1991-01-01
期刊：
影响因子：
4.6
通讯作者：
CARR, SH
中科院分区：
文献类型：
--
作者：
SWEI, H;CRIST, B;CARR, SH
本文用紧凑拉伸试样的J积分分析法评价了各种聚乙烯的室温平面应变断裂韧性。 在J（Ic）= 1.7 kJ m-2时，裂纹从高密度聚乙烯的剃刀切口开始扩展。 塑性变形被限制在一个小的银纹区域（约300 μ m长，20 μ m高），裂纹随后通过该区域扩展。 PE 3408材料的坚韧共聚物抵抗裂纹前进直到J（Ic）= 8.2 kJ m-2。 这里裂纹的扩展也是通过银纹进行的，尽管银纹长度超过1 mm。韧性也是通过在缺口尖端附近形成剪切带而获得的。 低密度聚乙烯在本试验条件下不会真正断裂;该材料的反应是一般屈服和缺口尖端变钝。
The J integral analysis of compact tension samples has been used to evaluate plane strain fracture toughness of various polyethylenes at room temperature. Crack propagation commences from a razor notch in high-density polyethylene at J(Ic) = 1.7 kJ m-2. Plastic deformation is confined to a small craze region (about 300-mu-m long, 20-mu-m high) through which the crack subsequently propagates. A tough copolymer of PE3408 material resists crack advance until J(Ic) = 8.2 kJ m-2. Here again crack propagation is through a craze, though craze length exceeds 1 mm. Toughness is also imparted by the formation of shear bands near the notch tip. Low-density polyethylene does not really fracture under the present test conditions; this material responds by general yielding and blunting of the notch tip.