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首页> 外文会议>12th Bienniel Conference on Fracture ECF 12 Vol.2, 12th, Sep 14-18, 1998, Sheffield >THE CORRELATION BETWEEN CHARPY FRACTURE ENERGY AND FRACTURE TOUGHNESS FROM A THEORETICAL POINT OF VIEW
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THE CORRELATION BETWEEN CHARPY FRACTURE ENERGY AND FRACTURE TOUGHNESS FROM A THEORETICAL POINT OF VIEW

机译：从理论的观点看片状断裂能与断裂韧性之间的关系

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摘要

Empirical correlation formulas are often used to estimate fracture toughness from the Charpy fracture energy - although they are known to be in general of poor accuracy and valid only with restrictions to certain classes of materials. In the present paper these relations are dealt with from a theoretical point of view, by extending an approximate single specimen method to determine dynamic J-R-curves from impact bending tests to the case of a classical Charpy test. Surprisingly - since there seems to be no direct physical relationship between crack initiation and the ductile fracture energy - a mathematical relation was found to hold between these two parameters. As expected, this relation is not unique, but dependent on some material properties like tensile strength and uniform fracture strain. The relation turned out to be in good agreement with experimental data and the current empirical correlation formulas, giving some theoretical support to the latter and confirming the present model.
机译：经验相关公式通常用于从夏比断裂能中估算断裂韧度-尽管众所周知，它们通常准确性较差，并且仅在某些材料类别的限制下才有效。在本文中，这些关系从理论的角度进行了处理，方法是将近似的单样本方法扩展为确定从冲击弯曲测试到经典夏比测试的动态J-R曲线。出乎意料的是-由于裂纹萌生与韧性断裂能之间似乎没有直接的物理关系-因此发现这两个参数之间存在数学关系。不出所料，这种关系不是唯一的，而是取决于某些材料特性，例如拉伸强度和均匀的断裂应变。该关系与实验数据和当前的经验相关公式非常吻合，为后者提供了一些理论支持并证实了当前模型。

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