The interaction between contact area and frictional forces in adhesive soft contacts is receiving much attention in the scientific community due to its implications in many areas of engineering such as surface haptics and bioinspired adhesives. In this work, we consider a soft adhesive sphere that is pressed against a rigid substrate and is sheared by a tangential force where the loads are transferred to the sphere through a normal and a tangential spring, representing the loading apparatus stiffness. We derive a general linear elastic fracture mechanics solution, taking into account also the interaction between modes, by adopting a simple but effective mixed-mode model that has been recently validated against experimental results in similar problems. We discuss how the spring stiffness affects the stability of the equilibrium contact solution, i.e. the transition to separation or to sliding.

粘合剂软接触中的接触面积和摩擦力之间的相互作用在科学界受到了广泛关注，因为它涉及许多工程领域，例如表面触觉和生物启发性粘合剂。在这项工作中，我们考虑了一个柔软的粘合剂球，该球被压在刚性基材上，并受到切向力的剪切，其中载荷通过法向和切向弹簧传递给球体，代表了加载设备的刚度。我们通过采用简单但有效的混合模式模型（最近已针对类似问题的实验结果进行了验证），考虑了模式之间的相互作用，得出了一般的线性弹性断裂力学解决方案。我们讨论了弹簧刚度如何影响平衡接触溶液的稳定性，即。e。向分离或滑动的过渡。