Equivalent cone apex angle of Berkovich indenter in face-forward and edge-forward nanoscratch
Equivalent cone apex angle of Berkovich indenter in face-forward and edge-forward nanoscratch
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DOI：
10.1016/j.wear.2016.03.005
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发表时间：
2016-06
期刊：
影响因子：
5
通讯作者：
H. Chamani;M. Ayatollahi
中科院分区：
文献类型：
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作者：
H. Chamani;M. Ayatollahi
为了模拟纳米压痕测试，通常使用具有等效锥顶半角度的锥形压头代替实际的3D Berkovich压头，以减少分析时间，并获得描述该现象的解析关系。本文的目的是调查是否有可能使用一个锥形压头与一个等效的锥顶半角，而不是布氏压头的边缘向前和面向前的方向在纳米划痕测试。本研究的主要目的是在纳米划痕测试过程中产生伯科维奇压头和锥形压头之间的相关性，以找到等效的锥顶半角。为此，采用有限元方法模拟金属材料的纳米划痕试验。用平均接触高度相等和表观摩擦系数相等两种方法计算了布氏压头刃口和端面朝向的等效锥顶半锥角。结果表明，这两种方法得到的等效锥顶半锥角各不相同。研究了局部摩擦系数对等效锥顶半锥角的影响。
To simulate a nanoindentation test, the conical indenters with an equivalent cone apex semi-angle are often used instead of actual 3D Berkovich indenter in order to reduce the analysis time duration and also to obtain the analytical relations to describe the phenomenon. The aim of this paper is to investigate whether it is possible to use a conical indenter with an equivalent cone apex semi-angle instead of Berkovich indenter for both edge-forward and face-forward orientations in the nanoscratch test. Generating a correlation between the Berkovich and conical indenters during the nanoscratch test to find an equivalent cone apex semi-angle is the main objective of the present study. For this purpose, the finite element method is employed to simulate the nanoscratch test for a metallic material. The equivalent cone apex semi-angles for edge and face-forward orientations of Berkovich indenter are calculated by two approaches; (i) mean contact height equality and (ii) apparent friction coefficient equality. The results reveal that different equivalent cone apex semi-angles are obtained as per each of the two approaches. The effect of local friction coefficient on the equivalent cone apex semi-angle is also investigated.