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Fracture of polymer-like networks with hybrid bond strengths
Journal of the Mechanics and Physics of Solids ( IF 5.0 ) Pub Date : 2024-11-10 , DOI: 10.1016/j.jmps.2024.105931
Chase M. Hartquist, Shu Wang, Bolei Deng, Haley K. Beech, Stephen L. Craig, Bradley D. Olsen, Michael Rubinstein, Xuanhe Zhao

The design and functionality of polymeric materials hinge on failure resistance. While molecular-level details drive crack evolution in polymer networks, the connection between individual chain scission and bulk failure remains unclear and difficult to probe. In this work, we systematically study the fracture mechanics of polymer-like networks with hybrid bond strengths. We reveal that varying the ratio of strong and weak strands within otherwise identical networks gives a non-monotonic relationship between intrinsic fracture energy and strong strand fraction. Networks with some weak strands can counterintuitively outperform those with exclusively strong strands. Experiments on poly(ethylene glycol) gels and architected polymer-like lattices together with simulations unveil these properties. We show through computational visualization that strand type concentrations impact crack growth patterns and fracture energy trends. Cracks propagate through weak layers at low strong strand fractions. Aggregate clusters deflect or pin cracks at similar concentrations of strong and weak strands. Cracks blunt due to dispersed weak strand failure at high strong strand fractions. The sacrificial weak strands can notably deconcentrate stress near the crack tip, which toughens by delaying crack advancement. The interplay between concentration and clustering of strand types in networks with hybrid bond strengths, combined with crack growth phenomena and nonlocal energy release, provides insights into unusual fracture characteristics. Results shed light on fracture in polymer networks and percolated lattices.

中文翻译:


具有混合键强度的类聚合物网络的断裂



聚合物材料的设计和功能取决于抗故障性。虽然分子水平的细节推动了聚合物网络中的裂纹演变,但单个链断裂与本体失效之间的联系仍然不清楚且难以探测。在这项工作中,我们系统地研究了具有混合键强度的类聚合物网络的断裂力学。我们揭示了在原本相同的网络中改变强链和弱链的比率,可以在本征断裂能量和强链分数之间产生非单调关系。具有一些弱链的网络可能会违反直觉地胜过那些完全具有强链的网络。对聚乙二醇凝胶和结构化聚合物状晶格的实验以及模拟揭示了这些特性。我们通过计算可视化表明,钢绞线类型浓度会影响裂纹扩展模式和断裂能量趋势。裂纹以低强链分数穿过薄层。聚集体簇在相似浓度的强链和弱链处偏转或固定裂缝。由于在高强股线分数处分散的弱股线失效,裂纹变钝。牺牲的弱股线可以显着分散裂纹尖端附近的应力,裂纹尖端通过延迟裂纹进展而变硬。在具有混合键强度的网络中,股线类型的集中和聚集之间的相互作用,结合裂纹扩展现象和非局部能量释放,为了解不寻常的断裂特性提供了见解。结果揭示了聚合物网络和渗滤晶格中的断裂。
更新日期:2024-11-10
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