Crack propagation due to brittle and ductile failures in microporous thermoelastoviscoplastic functionally graded materials
✍ Scribed by R.C. Batra; B.M. Love
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 1005 KB
- Volume
- 72
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Plane strain transient finite thermomechanical deformations of heat-conducting functionally gradient materials comprised of tungsten and nickel-iron matrix are analyzed to delineate brittle/ductile failures by the nodal release technique. Each material is modeled as strain-hardening, strain-rate-hardening and thermally-softening. Effective properties are derived by the rule of mixtures. At nominal strain-rate of 2000 s À1 brittle crack speed approaches Ray-leighÕs wave speed in the tungsten-plate, the nickel-iron-plate shatters at strain-rates above 1130 s À1 , and the composite plate does not shatter. The maximum speed of a ductile crack in tungsten and nickel-iron is about 1.5 km/s, and that in the composite is about 0.14 km/s.