论文标题
从粘弹性材料中脱离刚性平坦的拳头
Detachment of a rigid flat punch from a viscoelastic material
论文作者
论文摘要
我们表明，从粘弹性底物中脱离扁平冲锋的行为相对简单，在肯德尔在宽松的模量和瞬时模量上的弹性溶液与凝聚力强度极限之间构建。我们几乎没有发现拉式力对加载过程的细节的任何依赖性，包括在预加载和加载速率上的最大凹痕，从而比球形拳的情况要简单得多。当能量耗散可忽略不计时，拉力的峰值在卸载的最高速度下达到了峰值，这似乎与粘弹性半侵入裂纹裂纹传播的理论所暗示的形成对比，这将粘附的增强的工作与耗散相关联。与基于耗散的模型的进一步定性差异发生在解释有限的尺寸效果。
We show that the detachment of a flat punch from a viscoelastic substrate has a relatively simple behavior, framed between the Kendall's elastic solution at the relaxed modulus and at the instantaneous modulus, and the cohesive strength limit. We find hardly any dependence of the pull-off force on the details of the loading process, including maximum indentation at preload and loading rate, resulting much simpler than the case of a spherical punch. Pull-off force peaks at the highest speeds of unloading, when energy dissipation is negligible, which seems to be in contrast with what suggested by the theories originated by de Gennes of viscoelastic semi-infinite crack propagation which associated enhanced work of adhesion to dissipation. Further qualitative differences with the dissipation-based model occur to explain the finite size effect.
