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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Deformation of elastic coatings in adhesive contacts with spherical probes
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Deformation of elastic coatings in adhesive contacts with spherical probes

机译：球形探针与粘合剂接触时弹性涂层的变形

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摘要

This study addresses the problem of adhesive contacts between layered substrates and axisymmetric probes. A semi-analytical approach to adhesive contacts has been developed as an extension of a model recently published by Perriot and Barthel (2004 J. Mat. Res. 19 600-8) for the axisymmetric elastic indentation of non-adhesive, coated substrates. In addition to the load and penetration at equilibrium, the model allowed the derivation of the shape of the free surface in the contact zone. The validity of the approach was verified from experiments using contacts between acrylate films above their glass transition temperature (T-g) and spherical glass lenses. When the adhesive contacts were quenched below T-g, stable imprints were obtained which allowed determination of the surface deformations of the films. The latter were found consistent with the hypothesis of short range surface forces which were embedded in the contact model. Deviations from theory in the form of fingering instabilities at the periphery of the contact were observed when the confinement of the film was increased. A calculation of the stresses within the adhesive contacts indicated that these instabilities are probably driven by the release of lateral constraints within the confined films.
机译：这项研究解决了层状基底和轴对称探针之间的粘合剂接触问题。已经开发了一种用于半永久性接触的半分析方法，作为Perriot和Barthel（2004 J. Mat。Res。19 600-8）最近发布的模型的扩展，该模型用于非粘附性涂覆基材的轴对称弹性压痕。除了平衡时的载荷和穿透力，该模型还允许推导接触区域中自由表面的形状。通过使用高于其玻璃化转变温度（T-g）的丙烯酸酯薄膜与球形玻璃镜片之间的接触进行的实验，验证了该方法的有效性。当粘合剂接触点在T-g以下淬火时，获得了稳定的印迹，可以确定膜的表面变形。发现后者与接触模型中嵌入的短程表面力的假设一致。当增加膜的限制时，观察到在接触的外围存在指法不稳定性形式的理论偏差。粘合剂接触内应力的计算表明，这些不稳定性可能是由约束薄膜内横向约束的释放所驱动的。

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