Development of the average lattice phase-strain and global elastic macro-strain in Al/TiC composites
- Los Alamos National Lab., NM (United States)
- Ford Motor Co., Dearborn, MI (United States)
The development of elastic lattice phase strains and global elastic macro-strain in a 15 vol% TiC particle reinforced 2219-T6 Al composite was modeled by finite element method (FEM) as a function of tensile uniaxial loading. The numerical predictions are in excellent agreement with strain measurements at a spallation neutron source. Results from the measurements and modeling indicate that the lattice phase-strains go through a ``zigzag`` increase with the applied load in the direction perpendicular to the load, while the changes of slope in the parallel direction are monotonic. FEM results further showed that it is essential to consider the effect of thermal residual stresses (TRS) in understanding this anomalous behavior. It was demonstrated that, due to TRS, the site of matrix plastic flow initiation changed. On the other hand, the changes of slope of the elastic global macrostrain is solely determined by the phase-stress partition in the composite. An analytical calculation showed that both experimental and numerical slope changes during elastic global strain response under loading could be accurately reproduced by accounting for the changes of phase-stress ratio between the matrix and the matrix.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10119747
- Report Number(s):
- LA-UR-94-349; CONF-940692-1; ON: DE94006151
- Resource Relation:
- Conference: 4. international conference on residual stress (ICRS-4),Baltimore, MD (United States),8-10 Jun 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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