Modeling analysis of the indentation-derived yield properties of metallic multilayered composites
Modeling analysis of the indentation-derived yield properties of metallic multilayered composites
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DOI：
10.1016/j.compscitech.2004.12.051
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发表时间：
2005-09
影响因子：
9.1
通讯作者：
X. Tan;Yu‐Lin Shen
中科院分区：
文献类型：
--
作者：
X. Tan;Yu‐Lin Shen
小尺寸复合材料结构（例如多层薄膜）的整体机械性能的确定通常依赖于压痕技术。在本研究中，采用有限元建模来检查多层材料的压痕硬度与整体屈服强度之间的关系。为简单起见，层压复合材料由两种完美弹性塑性材料的交替层组成。首先量化均匀远场载荷下的整体屈服强度。然后模拟分层结构的压痕载荷，以覆盖多个层中的各种压痕深度。使用均质材料的数值建立关系将由此获得的系统硬度值转换为相应的流动应力。研究发现，在当前基于连续体的方法的范围内，压痕导出的强度始终低估了复合屈服强度。接触表面的摩擦也被发现起着重要作用。讨论了应用压痕技术探测金属多层膜整体力学性能的相关问题。
The determination of overall mechanical properties of small-scale composite structures, such as multilayered thin films, frequently relies on the indentation technique. In this study, finite element modeling is employed to examine the relationship between indentation hardness and overall yield strength of multilayered materials. For simplicity, the laminated composite is taken to consist of alternating layers of two elastic–perfectly plastic materials. The overall yield strength under uniform far-field loading is first quantified. Indentation loading of the layered structure is then simulated to cover a wide range of indentation depth well into multiple layers. The systematic hardness values thus obtained are converted to corresponding flow stresses using the numerically established relationship for homogeneous materials. It is found that the indentation-derived strength consistently underestimates the composite yield strength, within the scope of the present continuum-based approach. Friction at the contact surface is also found to play a significant role. Relevant issues on applying indentation techniques to probe overall mechanical properties of metallic multilayers are discussed.