微力学驱动的有限应变相场断裂模型用于研究交联弹性体中的损伤
Micromechanically motivated finite-strain phase-field fracture model to investigate damage in crosslinked elastomers
AI总结：
本文提出微力学驱动的有限应变相场损伤模型，结合聚合物链网络粘弹性本构与能量释放率公式，研究交联聚氨酯粘合剂的裂纹萌生与扩展，并通过有限元模拟与实验对比验证模型有效性。
摘要：
提出了一种微力学驱动的相场损伤模型，用于研究交联聚氨酯粘合剂的断裂行为。交联聚氨酯粘合剂通常表现出具有几何非线性的粘弹性行为。有限应变粘弹性行为采用考虑短链和长链长度分布的微力学网络模型进行建模。该微力学粘弹性网络模型还考虑了随着变形增加短链断裂/脱粘引起的软化。将该微力学模型与相场损伤模型耦合，以研究裂纹的萌生和扩展。求解相场方程需要临界能量释放率作为材料属性。能量释放率基于聚合物链网络进行公式化。数值研究采用有限元方法进行。将数值分析得到的力-位移曲线与实验结果进行比较，以验证所提出的材料模型。
英文摘要：
A micromechanically motivated phase-field damage model is proposed to investigate the fracture behaviour in crosslinked polyurethane adhesive. The crosslinked polyurethane adhesive typically show viscoelastic behaviour with geometric nonlinearity. The finite-strain viscoelastic behaviour is modelled using a micromechanical network model considering shorter and longer chain length distribution. The micromechanical viscoelastic network model also consider the softening due to breakage/debonding of the short chains with increase in deformation. The micromechanical model is coupled with the phase-field damage model to investigate the crack initiation and propagation. Critical energy release rate is needed as a material property to solve phase-field equation. The energy release rate is formulated based on the polymer chain network. The numerical investigation is performed using finite element method. The force-displacement curves from the numerical analysis and experiments are compared to validate the proposed material model.
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