Hygrothermal degradation makes a polymer composite more viscoelastic . So, the failure criteria equations should change for the sake of durability.
Because miodelas always start out from simplest odel. For composite modelling, starting from mathematics and physics, it would have been very much difficult to take into account diffusion of liquids into interior of composites, and absorbed-liquid-dependent viscoelastcity. Note, all basic failure theories of composites has some precedence to metals and ceramics, and it be Rankine, Tresca or Von mises, none at their time need to take into account time and stress-level depended elastic modulus, let alone corrosion and degradation of solids being concerned. Their profession was primarily as mathematician, not multiscale modeller. Note, even in 1850s or so, when Eiffel Towers were built, many constructors disagreed with the approach of making a very heavy, expensive and physcially real structure out of idealizedabstraction at the mental realm of mathematicians.
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