刚性平冲头从粘弹性材料上的脱离
Detachment of a rigid flat punch from a viscoelastic material
AI总结：
研究刚性平冲头从粘弹性基底脱离的简单行为，发现脱模力几乎不依赖加载过程细节，在最高卸载速度时达峰值且耗散可忽略，与基于耗散的de Gennes理论相矛盾。
摘要：
我们表明，平冲头从粘弹性基底的脱离具有相对简单的行为，其介于松弛模量和瞬时模量下的Kendall弹性解与内聚强度极限之间。我们发现脱模力几乎不依赖于加载过程的细节，包括预载时的最大压痕和加载速率，这比球形冲头的情况简单得多。脱模力在卸载速度最高时达到峰值，此时能量耗散可以忽略不计，这似乎与由de Gennes提出的粘弹性半无限裂纹扩展理论所建议的将增强的粘附功与耗散相关联的观点相矛盾。基于耗散的模型还出现了进一步的定性差异，以解释有限尺寸效应。
英文摘要：
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.
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