Dynamic crack growth along a polymer composite-Homalite interface

Date

2003-03-01

Author

Çöker, Demirkan
Needleman, A.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

160
views

0
downloads

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

Suggestions

OpenMETU
Core

Fast crack growth along interfaces Needleman, A.; Çöker, Demirkan; Rosakis, A.j. (2005-01-01) Analyses of dynamic crack growth along interfaces are discussed. The material on each side of the bond line is characterized by an elastic constitutive relation. A cohesive surface constitutive relation that allows for the creation of new free surface is also specified across the bond line. The resistance to crack initiation and the crack speed history are then predicted without invoking any additional failure criterion. Two dimensional models, both plane strain and plane stress, of the configuration used i...
Intersonic delamination in curved thick composite laminates under quasi-static loading Gozluklu, Burak; Uyar, Imren; Çöker, Demirkan (2015-01-01) Dynamic delamination in curved composite laminates is investigated experimentally and numerically. The laminate is 12-ply graphite/epoxy woven fabric L-shaped laminate subject to quasi-static loading perpendicular to one arm. Delamination initiation and propagation are observed using high speed camera and load displacement data is recorded. The quasistatic shear loading initiates delamination at the curved region which propagates faster than the shear wave speed of the material, leading to intersonic delami...
Morphological evolution of edge-hillocks on single-crystal films having anisotropic drift-diffusion under the capillary and electromigration forces Ogurtani, Tarik Omer; Celik, Aytac; Oren, Ersin Emre (Elsevier BV, 2007-01-22) The morphological evolution of hillocks at the unpassivated sidewalls of single-crystal metallic thin film interconnects is investigated via computer simulations using the free-moving boundary value problem. The effect of drift-diffusion anisotropy on the development of surface topographical scenarios is fully explored under the action of electromigration and capillary forces, utilizing numerous combinations of the surface texture, the drift-diffusion anisotropy and the direction of the applied electric fie...
Effects of geometric factors on mode I fracture toughness for modified ring tests Tutluoğlu, Levend (2012-04-01) Stress intensity factors of specimen models with various external diameters, inner hole diameters, and extents of flattened loading boundaries for the modified ring testing method for mode I fracture are computed by finite element modeling. Effects of boundary conditions and geometric factors on stress intensity factor computation are analyzed. Parametric expressions are proposed to estimate critical crack length position and corresponding maximum stress intensity factor. An expression in terms of inner hol...
Micromechanical cohesive zone relations for ductile fracture Yalçınkaya, Tuncay (Elsevier BV; 2016-06-24) This paper addresses the derivation of a micromechanically motivated incremental mixed-mode traction separation law in the context of cohesive zone modeling of crack propagation in ductile metallic materials. The formulation is based on the growth of an array of pores idealized as cylinders which are considered as the representative volume elements. An upper bound solution is applied for the deformation of the representative volume element and different incremental traction-separation relations are obtained...

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.