Dynamic crack growth along a polymer composite-Homalite interface

Date

2003-03-01

Author

Çöker, Demirkan
Needleman, A.

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Dynamic crack growth along the interface of a fiber-reinforced polymer composite-Homalite bimaterial subjected to impact shear loading is investigated experimentally and numerically. In the experiments, the polymer composite-Homalite specimens are impacted with a projectile causing shear dominated interfacial cracks to initiate and subsequently grow along the interface at speeds faster than the shear wave speed of Homalite. Crack growth is observed using dynamic photoelasticity in conjunction with high-speed photography. The calculations are carried out for a plane stress model of the experimental configuration and are based on a cohesive surface formulation that allows crack growth, when it occurs, to emerge as a natural outcome of the deformation history. The effect of impact velocity and loading rate is explored numerically. The experiments and calculations are consistent in identifying discrete crack speed regimes within which crack growth at sustained crack speeds is possible. We present the first conclusive experimental evidence of interfacial crack speeds faster than any characteristic elastic wave speed of the more compliant material. The occurrence of this crack speed was predicted numerically and the calculations were used to design the experiments. In addition, the first experimental observation of a mother-daughter crack mechanism allowing a subsonic crack to evolve into an intersonic crack is documented. The calculations exhibit all the crack growth regimes seen in the experiments, and, in addition, predict a regime with a pulse-like traction distribution along the bond fine.

Subject Keywords

Dynamic fracture, Intersonic crack speed, Interface fracture, Bimaterials

URI

https://hdl.handle.net/11511/33039

Journal

Journal of the Mechanics and Physics of Solids

DOI

https://doi.org/10.1016/s0022-5096(02)00082-0

Collections

Department of Aerospace Engineering, Article

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Citation Formats

D. Çöker and A. Needleman, “Dynamic crack growth along a polymer composite-Homalite interface,” Journal of the Mechanics and Physics of Solids, pp. 425–460, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33039.