Spherical indentation of porous ceramics: Elasticity and hardness
Spherical indentation of porous ceramics: Elasticity and hardness
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DOI：
10.1016/j.jeurceramsoc.2015.12.049
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发表时间：
2016-05-01
影响因子：
5.7
通讯作者：
Brandon, Nigel
中科院分区：
文献类型：
--
作者：
Chen, Zhangwei;Wang, Xin;Brandon, Nigel
采用实验和数值相结合的方法研究了多孔陶瓷材料（La0.6Sr0.4Co0.2Fe0.8O3，LSCF）的弹性和塑性变形，该材料的孔隙率在5- 45vol%范围内，经受球形压痕。在有限元模拟中使用Gurson模型来描述压头下塑性区中多孔材料的致密化。模拟得到的压痕响应曲线、弹性模量、硬度和塑性区致密化程度与实验结果吻合较好。结果表明，硬度增加的最大压痕深度超过一个代表性的深度，取决于孔隙率。在这种特殊的陶瓷中，在足够大的穿透深度下，硬度约为多孔材料的单轴屈服应力的1.7倍。(C)2016年6月，作者。爱思唯尔有限公司出版
A combined experimental and numerical approach is used to characterise the elastic and plastic deformation of a porous bulk ceramic material (La0.6Sr0.4Co0.2Fe0.8O3, LSCF) with porosities in the range 5-45 vol%, undergoing spherical indentation. The Gurson model was used in FEM simulations to describe the densification of the porous material in the plastic zone under the indenter. The simulated indentation response curves, extracted elastic modulus, hardness and densification in the plastic zone all showed good agreement with corresponding experimental observations. The results show that the hardness increases with maximum indentation depth over a representative depth that depends on porosity. In this particular ceramic the hardness, at sufficiently large penetration depth, is approximately 1.7 times the uniaxial yield stress of the porous material. (C) 2016 The Authors. Published by Elsevier Ltd.