Essential work of fracture study of polymers: a novel criterion for the validation of tested ligament range
Essential work of fracture study of polymers: a novel criterion for the validation of tested ligament range
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聚合物断裂研究的基本工作：验证测试韧带范围的新标准
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
P. Nagy
中科院分区：
文献类型：
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作者：
F. Tuba;L. Oláh;P. Nagy
断裂方法的基本工作广泛用于测定平面应力条件下韧性金属和聚合物的断裂韧性。然而，该方法有许多先决条件，这些条件在金属中容易满足，但在聚合物中则不太确定。因此，本研究的目的是提出一种简单的、经验性的“位移准则”，以帮助确定聚合物的有效韧带长度——这是该理论最大的误差来源之一。该准则不仅有助于确定下限，还有助于描述韧带长度的上限。它的另一个优点是，与应力准则相结合，不仅有助于在裂纹萌生之前的数据验证，而且有助于整个变形过程的数据验证。
The essential work of fracture method is widely used for the determination of fracture toughness of ductile metals and polymers under plane stress conditions. Nevertheless, this method has numerous prerequisites, which are easy to fulfill in metals, but are less certain in polymers. The aim of this study was, therefore, to present a simple, empiric “displacement-criterion” that helps the determination of valid ligament lengths for polymers—one of the biggest sources of error of this theory. This criterion not only facilitates the definition of a lower bound, but also helps the description of an upper ligament limit. Its other advantage is, that combined with a stress criterion, it helps the data validation not only until crack initiation, but also over the entire deformation process.