Abstract
A theoretical study is carried out of a tungsten—based composite sustaining debonding at tungsten-tungsten grain boundaries. The tungsten composite is comprised of a continuous network of pure tungsten grains embedded in a relatively soft tungsten—nickel—iron matrix. A damage evolution model is proposed based on the Weibull statistics relating the fraction of debonded W-W grain boundaries to the tungsten volume fraction and the applied strains. The deformation of the alloy with debonded grain boundaries perpendicular to the tensile loading direction is simulated using a three-phase finite element cell model; both constant damage and progressive damage are considered. Systematic predictions are made for the effect of debonding on the tensile flow behavior of the tungsten composite. It is shown that the stress—strain behavior of the alloy under quasistatic tensile loading is controlled by two competing trends—strain hardening and debonding softening—both evolve with the tungsten volume fraction and the applied strains.
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