Crack Growth Across a Strength Mismatched Bimaterial Interface |
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Authors: | D Wäppling J Gunnars P Stâhle |
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Affiliation: | (1) Division of Solid Mechanics, Department of Mechanical Engineering, Lulea University of Technology, S-97187 Lulea, Sweden |
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Abstract: | Crack growth across an interface between materials with different strength is examined by a cohesive zone model. The two materials
have identical elastic properties but different fracture process properties, or different yield stresses, which is modeled
by different cohesive stresses. The fracture criteria is a critical crack opening displacement. Load is represented by a stress
intensity factor defining a remote square root singular stress field. The results show that the ratio between the cohesive
stresses of the two materials primarily determines the behavior of the critical stress intensity factor. When the crack approaches
a material with a higher cohesive stress the crack tip is shielded, but if the crack approaches a material with smaller critical
crack opening displacement the maximum level of shielding is determined by the ratio between the critical crack opening displacements.
When a crack approaches a material with a lower cohesive stress it is exposed to an amplified load.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Bimaterial interface cohesive zone crack growth fracture process properties |
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