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Nanoindentation with spherical indenters: finite element studies of deformation in the elastic-plastic transition regime

机译：球形压头的纳米压痕：弹塑性过渡区变形的有限元研究

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Finite element simulation techniques were used to examine spherical indentation in the elastic-plastic transition regime and characterize the development of the constraint factor―the ratio of the mean pressure to the flow stress―with penetration depth for a wide variety of materials with different yield strengths and work hardening behavior. The simulations showed that the initial portion of the transition at small penetration depths is essentially independent of the work hardening behavior because plastic deformation in the subsurface plastic zone is constrained by surrounding elastic material. This is a potentially useful result in that it implies that some material properties may be measured from the indentation load-displacement data without prior knowledge of the work hardening behavior. At larger depths, the constraint factor diverges and the indentation behavior becomes dependent on the work hardening characteristics. These observations serve to divide the elastic-plastic transition into elastically-dominated and plastically-dominated parts. Insights gained about the behavior are presented and discussed.
机译：有限元模拟技术用于检查弹塑性过渡状态下的球形压痕，并表征了不同屈服强度的多种材料的约束因子（平均压力与流动应力之比）与穿透深度的关系。并加强锻炼行为。模拟表明，在小穿透深度处过渡的初始部分基本上与加工硬化行为无关，因为地下塑性区的塑性变形受到周围弹性材料的约束。这是潜在有用的结果，因为它暗示可以在不事先了解加工硬化行为的情况下，从压痕载荷-位移数据测量某些材料性能。在更大的深度，约束因素会发散，压痕行为将取决于加工硬化特性。这些观察将弹塑性转变分为弹性支配部分和塑性支配部分。提出并讨论了有关该行为的见解。

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