Phase separation stress-strain curves

In Fig. 11.5, the stress-strain plots are depicted for a series of two-phase PC/PMMA blends with various concentrations. The phase-separated morphology was obtained by melt mixing. The position of the yield point on the stress-strain curves illustrates the stepwise transition of micromechanism of tensile deformation, characteristic of PMMA, which is crazing, to the mechanism of deformation, characteristic of PC - shear 5delding. 

Fig. 7 a and b. Scheme of the thermomechanical behaviour of a well phase-separated thermoelasto-plastic. Stress-strain (or time) curves. Plots of heat effects versus time. First loading (ABC) and unloading (CD) cycle. Second loading (AC) and unloading (CD) cycle. The yielding point occurs at B. AD indicates the residual deformation after the first cycle. AB on the dQ/dT-time curve is the endo-effect resulting from the initial small-strain deformation AB U9)... 

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