Finite element analysis is used to explore composites of negative thermal expansion materials with positive thermal expansion
materials (ZrW2O8 in Cu and ZrO2 in ZrW2O8) and evaluate how thermal and mechanical properties, rates of cooling/heating, and geometry and packing fraction influence
the overall expansion and thermal stress. During rapid temperature changes, the transient short-time thermal expansion can
be considerably larger than the steady-state value. Furthermore, thermal stress in the composite can be large, especially
at the interface between the materials, and can exceed the material strength.