Abstract Fracture toughness can be measured by microscratch test from objective force and depth measurement, which is much convenient than indentation approach and conventional means, since initial notch or pre-crack is not required. Micro-scratch test was conducted on copper under a spherical probe of radius 105 μm and constant applied normal load with the aim of characterizing fracture toughness of copper by sliding technique with a sphere. Scratch variables such as normal load, lateral load, friction coefficient, and penetration depth were analyzed, and different methodologies for calculating fracture toughness were compared. Linear elastic fracture mechanics was found to be inapplicable to scratch of elastic-plastic material with sufficient plasticity under a spherical probe, while energetic size effect law can be successfully applied to characterize fracture toughness by microscratch test with a sphere abrading metallic material.

中文翻译：

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用球形压头通过恒载微划痕测量铜的断裂韧性

摘要 断裂韧度可以通过客观力和深度测量的微划痕测试来测量，这比压痕法和常规方法方便得多，因为不需要初始缺口或预裂纹。在半径为 105 μm 的球形探针和恒定施加法向载荷下对铜进行微划痕试验，目的是通过球体滑动技术表征铜的断裂韧性。分析了法向载荷、横向载荷、摩擦系数和穿透深度等划痕变量，并比较了计算断裂韧性的不同方法。发现线弹性断裂力学不适用于球形探针下具有足够塑性的弹塑性材料的划痕，