Experiments and numerical simulations on dynamic crack behavior at the interface of layered brittle material

Crack behavior at the interface between two materials is the core problem of layered material fracturing. In this paper, first, experimental tests were conducted on layered material using a drop weight test system following the caustics method. The layered material was made of poly (methyl methacryl...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2022-12, Vol.45 (12), p.3546-3558
Main Authors: Zhou, Jun, Yue, Zhongwen, Feng, Chun, Wang, Peng, Yue, Xiaolei, Tao, Tiejun
Format: Article
Language:English
Subjects:
Brittle materials
caustics
continuum–discontinuum element method
Crack propagation
Crack tips
Cracking (fracturing)
Drop tests
drop weight tests
Epoxy resins
Impact velocity
Inclination angle
interface crack
Interfacial strength
Layered materials
Polymethyl methacrylate
Propagation
Simulation
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Summary:Crack behavior at the interface between two materials is the core problem of layered material fracturing. In this paper, first, experimental tests were conducted on layered material using a drop weight test system following the caustics method. The layered material was made of poly (methyl methacrylate) (PMMA) and epoxy resin bonded with Loctite‐330 at two inclination angles (30° and 60°). A corresponding numerical simulation was carried out using continuum–discontinuum element methods. Crack propagation is found to mainly occur in mode I in the PMMA and epoxy resin but follows a mixed cracking mode at the interface. The fracture parameters of the crack tip in the layered materials changed substantially owing to the existence and change of the interface structure. After the crack enters the interface, the crack propagation speed increases significantly. Higher crack dip angles are associated with greater crack propagation speed increases after entering the interface. The simulation results indicate that the interface strength properties affect crack behavior at the interface. This effect also varies as a function of interface inclination and impact velocity. Highlights Caustics method is used to study fracture parameters of layered material. A mixed‐mode fracture model is implemented into CDEM to simulate interface crack. Effect of strength properties on interface crack are simulated. Effect of impact velocity on interface crack are simulated.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13829