Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1584554 | Materials Science and Engineering: A | 2007 | 15 Pages |
Abstract
The crack propagation and damage evolution in metal (Ti6Al4V)-intermetallic (Al3Ti) laminate composites were investigated. The composites (volume fractions of Ti6Al4V: 14%, 20% and 35%) were tested under different loading directions (perpendicular and parallel directions to laminate plane), to different strains (1%, 2%, 3%) and at different strain rates (0.0001 and 800-2000Â sâ1). Crack densities and distributions were measured. The crack density increases with increasing strain, but decreases (at a constant strain) with increasing volume fraction of Ti6Al4V. Differences in crack propagation and damage evolution in MIL composites under quasi-static (10â4Â sâ1) and dynamic (800-2000Â sâ1) deformation were observed. The fracture stress does not exhibit significant strain-rate sensitivity; this is indicative of the dominance of microcracking processes in determining strength. Generally, the crack density after dynamic deformation is higher than that after quasi-static deformation. This is attributed to the decreased time for crack interaction in high-strain rate deformation. The effect of crack density, as quantified by a damage parameter, on elastic modulus and stress-strain relation were calculated and compared with experimental results.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Tiezheng Li, Fengchun Jiang, Eugene A. Olevsky, Kenneth S. Vecchio, Marc A. Meyers,