On the Vickers indentation fracture toughness test
On the Vickers indentation fracture toughness test
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DOI：
10.1111/j.1551-2916.2006.01482.x
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发表时间：
2007-03-01
影响因子：
3.9
通讯作者：
Bradt, Richard C.
中科院分区：
文献类型：
--
作者：
Quinn, George D.;Bradt, Richard C.
维氏压痕断裂韧性测试（VIF）是通过考虑其起源和许多方程来解决的，这些方程与估计陶瓷的抗断裂性（K-Ic）的技术一起应用。描述了VIF试验中裂纹的萌生和扩展，并与国际标准化断裂韧性试验中的预裂和裂纹扩展进行了对比。结果表明，振动振动试验技术与标准断裂韧性试验有本质区别。VIF试验是一个复杂的三维裂纹系统，裂纹周围存在大量的变形、残余应力和损伤。与标准化断裂韧性试验的快速裂纹扩展相反，VIF试验涉及的是一个定义不明确的裂纹止裂条件。本文综述了先前发表的利用VIF技术获得的断裂韧性结果。这些揭示了报道的VIF断裂韧性值的严重差异。最后，介绍了近年来用VIF技术对标准材料SRM 2100进行的抗断裂性能测试。将这些结果与同一材料的标准化测试结果进行比较。结果表明，VIF技术作为陶瓷或其他脆性材料的断裂韧性测试是不可靠的。VIF在抗断裂性方面实际测量的是什么，目前还不能轻易定义。建议在陶瓷材料的断裂韧性测试中不再接受振动场技术。
The Vickers indentation fracture toughness test, or VIF, is addressed by considering its origins and the numerous equations that have been applied along with the technique to estimate the fracture resistance, or the K-Ic of ceramics. Initiation and propagation of cracks during the VIF test are described and contrasted with the pre-cracking and crack growth for internationally standardized fracture toughness tests. It is concluded that the VIF test technique is fundamentally different than standard fracture toughness tests. The VIF test has a complex three-dimensional crack system with substantial deformation residual stresses and damage around the cracks. The VIF test relates to an ill-defined crack arrest condition as opposed to the rapid crack propagation of the standardized fracture toughness tests.Previously published fracture toughness results employing the VIF technique are reviewed. These reveal serious discrepancies in reported VIF fracture toughness values. Finally, recent fracture resistance measurements by the VIF technique for the Standard Reference Material SRM 2100 are presented. These are compared with standardized test results for the same material. It is concluded that the VIF technique is not reliable as a fracture toughness test for ceramics or for other brittle materials. What the VIF actually measures in terms of fracture resistance cannot be readily defined. It is recommended that the VIF technique no longer be acceptable for the fracture toughness testing of ceramic materials.