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首页> 外文期刊>Journal of Materials Research >Experimental Measurement And Numerical Simulation Of The Plastic Strain During Indentation And Scratch Tests On Polymeric Surfaces
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Experimental Measurement And Numerical Simulation Of The Plastic Strain During Indentation And Scratch Tests On Polymeric Surfaces

机译：聚合物表面压痕和划痕试验中塑性应变的实验测量和数值模拟

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摘要

For elastic-plastic contacts, we propose a complete description of the plastic strain field beneath the indenter during indentation and scratch with a spherical indenter (with R, the tip radius), as a function of the testing conditions, defined by the geometrical strain, noted a/R (with a, the contact radius), and the local friction coefficient μ_(loc). The main parameter of the description is the level of the plastic deformation imposed during test into amorphous polymeric surfaces, related in first approximation to the ratio alR. An equivalent average plastic strain, noted (ε~p)_(av), is calculated over a representative plastically deformed volume, both for indentation and scratch tests. The equivalent average plastic strain (ε~p)_(av), is observed to increase with the ratio a/R, as predicted by the empirical Tabor's rule, but also with the local friction coefficient μ_(loc) for a given ratio a/R, especially during scratching. The plastic zone dimensions and the plastic strain gradient developed beneath the moving tip are shown to depend both on the geometrical strain a/R and also on the friction coefficient μ_(loc).
机译：对于弹塑性接触，我们建议使用球形压头（带有R，尖端半径）在压痕和刮擦过程中压头下方的塑性应变场作一个完整的描述，它是测试条件的函数，由几何应变定义，注意a / R（其中a为接触半径）和局部摩擦系数μ_（loc）。描述的主要参数是在测试过程中施加到无定形聚合物表面上的塑性变形水平，该水平首先近似于比率alR。在压痕试验和划痕试验中，在代表性的塑性变形体积上计算出等效的平均塑性应变，记为（ε〜p）_（av）。观察到等效平均塑性应变（ε〜p）_（av）随经验塔博尔定律预测的a / R比率增加，但在给定比率a的情况下也随着局部摩擦系数μ_（loc）增大。 / R，尤其是在刮擦期间。示出了在运动的尖端下方产生的塑性区尺寸和塑性应变梯度既取决于几何应变a / R，又取决于摩擦系数μ_（loc）。

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