穿孔EPDM带材裂纹扩展的混合相场断裂模型
A mixed phase-field fracture model for crack propagation in punctured EPDM strips
摘要：
在这项工作中，我们提出了裂纹扩展实验评价的数字图像相关（DIC）的炭黑填充三元乙丙橡胶（EPDM）和数值模拟的帮助下，变相场断裂。我们的主要重点是在单面缺口EPDM条包含一个圆孔裂纹的演变。裂纹扩展实验的补充调查确定的机械材料性能以及临界应变能释放率。相场断裂模拟是模拟缺口裂纹演化的一种常用方法。为了避免体积锁定效应，考虑几乎不可压缩材料中的断裂，准静态相场断裂模型在其经典配方的固体位移方程的混合形式的帮助下重新制定。采用混合有限元方法，利用实验确定的材料参数，将新建立的混合相场断裂模型应用于EPDM带穿刺后的裂纹扩展模拟。为了讨论协议，并指出挑战和差异，裂纹路径，最大力响应，横向位移在裂纹开始，以及力-位移曲线的实验和数值结果进行了比较。
英文摘要：
In this work, we present crack propagation experiments evaluated by digital image correlation (DIC) for a carbon black filled ethylene propylene diene monomer rubber (EPDM) and numerical modeling with the help of variational phase-field fracture. Our main focus is the evolution of cracks in one-sided notched EPDM strips containing a circular hole. The crack propagation experiments are complemented with investigations identifying the mechanical material properties as well as the critical strain energy release rate. For simulating the evolution of cracks with a given notch, phase-field fracture modeling is a popular approach. To avoid volume-locking effects considering fractures in nearly incompressible materials, a quasi-static phase-field fracture model in its classical formulation is reformulated with the help of a mixed form of the solid-displacement equation. The new established mixed phase-field fracture model is applied to simulate crack propagation in punctured EPDM strips by using the experimentally identified material parameters with mixed finite elements. To discuss agreements and point out challenges and differences, the crack paths, the maximal force response, the traverse displacement at the crack start, as well as force-displacement curves of the experimental and numerical results are compared.
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