Effects of thickness on the specific Essential Work of fracture of rigid PVC
Effects of thickness on the specific Essential Work of fracture of rigid PVC
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DOI：
10.1002/pen.10652
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发表时间：
1996-10
影响因子：
3.2
通讯作者：
G. Levita;L. Parisi;A. Marchetti;L. Bartolommei
中科院分区：
文献类型：
--
作者：
G. Levita;L. Parisi;A. Marchetti;L. Bartolommei
根据基本断裂功（EWF）方法研究了2 ~ 10 mm厚的刚性聚氯乙烯（PVC）片材的断裂行为，以寻找厚度效应的证据。对试样进行双重切口并加载张力。在三点弯曲中测量J积分的临界值，符合或违反ASTM 813.89方案规定的尺寸要求。结果发现，J c不依赖于样品的厚度，相反，特定的断裂基本功的值，通过试样的韧带大于三倍的厚度，得到的强烈影响的样品厚度。通过光学方法测量韧带周围形成的塑性区的大小。在小韧带处，该区域的高度随着韧带尺寸线性增加，并且在大韧带处趋于稳定。在线性范围内，塑性区尺寸的增加速率不依赖于样品厚度。结果表明，塑性区在线性范围内的试件所得到的断裂比功值与厚度无关。
The fracture behavior of sheets of rigid poly(vinyl chloride), PVC, 2 to 10 mm thick, was investigated according to the Essential Work of Fracture (EWF) approach in order to find evidence of thickness effects. Test pieces were doubly notched and loaded in tension. Critical values of the J-integral were measured, in three-point bending, either complying with or violating the size requirements dictated by the ASTM 813.89 protocol. It was found that J c did not depend on sample thickness ; on the contrary, the value of the Specific Essential Work of Fracture, obtained by means of test pieces with ligaments larger than three times the thickness, was strongly affected by the sample thickness. The size of the plastic zone that developed around the ligaments was measured by optical means. At small ligaments the height of this zone linearly increased with ligament size and tended to level off at large ligaments. In the linear range, the rate of increase of the size of the plastic zone did not depend on sample thickness. It was found that the value of the Specific Essential Work of Fracture obtained by test pieces whose plastic zones were in the linear range was independent of thickness.