Computationally implemented modeling of creep of composite materials caused by phase dissolution
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2016 Multiphasic composites with time-evolving, transient microstructures exhibit time-dependent behavior under load. One mechanism leading to this behavior is the dissolution of load-bearing phases within such materials. When the dissolution process occurs inside one phase of the composite material, the stress transmitted by the dissolving phase transfers into the neighboring phases, resulting in additional deformation of the whole composite. This additional deformation of the macroscopic material manifests as time-dependent creep of the composite. The purpose of this paper is to provide a general kinematic framework for such dissolution induced creep for virtually any material class, and to mechanistically model the same utilizing a computationally-implemented approach that is consistent with the kinematic framework. Utilizing this modeling approach, two distinct processes are computationally simulated, namely (1) creep of a water saturated, porous, frozen body upon warming and (2) creep of cement paste due to hydration-induced dissolution of cement grains. The simulation results show that microstructure evolution induces significant creep behavior of the whole composite in these two simulated cases.
