A new method to extract elastic modulus of brittle materials from Berkovich indentation
A new method to extract elastic modulus of brittle materials from Berkovich indentation
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DOI：
10.1016/j.jeurceramsoc.2017.08.029
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发表时间：
2018
影响因子：
5.7
通讯作者：
Yan Chen;M. Sullivan;Anqi Zhang;B. Prorok
中科院分区：
文献类型：
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作者：
Yan Chen;M. Sullivan;Anqi Zhang;B. Prorok
本文描述了一种在连续刚度模式下，用Berkovich压痕可靠地测量脆性材料弹性模量的方法。它涉及在被测材料的表面沉积一层金属膜，以吸收由穿透压头引起的非弹性损伤。采用zhou - proorok模型并重新排列以解耦薄膜和衬底的贡献。这将其转换为双曲形式，当压头接近薄膜/衬底界面时，它接近渐近线。这条渐近线是用一个简单的线性近似来描述的，它的斜率直接显示了衬底的弹性模量。该方法使脆性陶瓷的弹性行为可以在没有压头穿透它的情况下进行评估。事实上，这种方法可以评估未知的薄膜/衬底复合材料的性能，只要人们有薄膜厚度的估计，薄膜可以明显的塑性变形。
This work describes a method to reliably measure the elastic modulus of brittle materials from Berkovich indents under the continuous stiffness mode. It involves depositing a metallic film at the surface of the tested material to absorb the inelastic damage caused by the penetrating indenter. The Zhou-Prorok model was employed and rearranged to decouple the film and substrate contributions. This converted it into a hyperbolic form that approached an asymptote as the indenter approaches the film/substrate interface. This asymptote was described by a simple linear approximation whose slope directly revealed the substrate’s elastic modulus. The method enabled the elastic behavior of the brittle ceramic to be assessed without the indenter penetrating it. In fact, this method can assess properties of an unknown film/substrate composite as long as one has an estimate of the film thickness and the film can appreciably plastically deform.