A CRITICAL-EVALUATION OF INDENTATION TECHNIQUES FOR MEASURING FRACTURE-TOUGHNESS .1. DIRECT CRACK MEASUREMENTS
A CRITICAL-EVALUATION OF INDENTATION TECHNIQUES FOR MEASURING FRACTURE-TOUGHNESS .1. DIRECT CRACK MEASUREMENTS
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DOI：
10.1111/j.1151-2916.1981.tb10320.x
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发表时间：
1981-01-01
影响因子：
3.9
通讯作者：
MARSHALL, DB
中科院分区：
文献类型：
--
作者：
ANSTIS, GR;CHANTIKUL, P;MARSHALL, DB
压痕技术的应用，断裂韧性的评价是严格审查，在两个部分。在第一部分中，注意力集中在一种方法上，该方法涉及直接测量维氏产生的径向裂纹作为压痕载荷的函数。首先建立了该方法的理论基础，在弹性/塑性压痕断裂力学。由此可以断言，径向裂纹响应的关键在于接触场的剩余分量。该剩余项对裂纹演化具有重要意义，包括在环境敏感条件下压痕后缓慢增长的可能性。在选定的“参考”材料中的裂纹的断口观察用于确定这种影响的大小，并调查与偏离理想的压痕断裂行为相关的其他潜在的并发症。这些观察数据为压痕韧性方程提供了一个方便的校准，可用于其他性能良好的陶瓷。该技术具有独特的工艺简单、材料经济等优点。
The application of indentation techniques to the evaluation of fracture toughness is examined critically, in two parts. In this first part, attention is focused on an approach which involves direct measurement of Vickers‐produced radial cracks as a function of indentation load. A theoretical basis for the method is first established, in terms of elastic/plastic indentation fracture mechanics. It is thereby asserted that the key to the radial crack response lies in the residual component of the contact field. This residual term has important implications concerning the crack evolution, including the possibility of post indentation slow growth under environment‐sensitive conditions. Fractographic observations of cracks in selected “reference” materials are used to determine the magnitude of this effect and to investigate other potential complications associated with departures from ideal indentation fracture behavior. The data from these observations provide a convenient calibration of the Indentation toughness equations for general application to other well‐behaved ceramics. The technique is uniquely simple in procedure and economic in its use of material.