Identifying the limitation of Oliver and Pharr method in characterizing the viscoelastic-plastic materials with respect to indenter geometry
Identifying the limitation of Oliver and Pharr method in characterizing the viscoelastic-plastic materials with respect to indenter geometry
复制标题
确定 Oliver 和 Pharr 方法在表征粘弹塑性材料压头几何形状方面的局限性
DOI：
10.1557/proc-1137-ee10-23
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
D. Raabe
中科院分区：
文献类型：
--
作者：
K. Balasundaram;Yanping Cao;D. Raabe
近年来，纳米压痕试验被广泛应用于聚合物和生物材料等粘弹塑性材料的微观或纳米尺度的力学性能表征，采用了Oliver & Pharr （OP）提出的分析方法。然而，最近的研究表明，使用OP方法确定粘弹塑性（聚合物）材料的力学性能并不能正确评估杨氏模量。为了确定OP方法的局限性，使用不同的聚合物，对不同的压头几何形状（如球形和伯科维奇几何形状）进行了系统的实验研究。
Nanoindentation tests are widely used in recent years to characterize the mechanical properties of viscoelastic-plastic materials like polymers and biomaterials at the micro or nano-scale using the analysis method proposed by Oliver & Pharr (OP). However, recent studies revealed that the mechanical properties of viscoelastic-plastic (polymeric) materials determined using the OP method does not lead to a correct evaluation of Young's modulus. A systematic experimental study is performed with different indenter geometries like spherical and Berkovich geometries using various polymers in order to identify the limitations of the OP method.