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The mechanical performance of crazed polycarbonate was characterized by measuring the yield stress, elastic modulus, failure stress, and ductility for constant strain rate tensile tests.
In an attempt to build a model to predict the residual mechanical properties of crazed polycarbonate, several samples were crazed to a relative craze density of 10% at 40, 45, and 50 MPa.
The table also shows that the failure stresses of samples crazed at 40 MPa were approximately 10% smaller than for uncrazed samples.
The first mechanical property of crazed polycarbonate to be considered in the two-factor model was yield stress.
Using the data in Table 3, the constant and coefficients for the predictive model for the yield stress of crazed polycarbonate were calculated and are shown in Table 4.
Therefore, the predictive model for the yield stress of crazed polycarbonate will contain only these two terms, as shown by
With increasing strain, a large fan-shape crazed zone is generated and a shear yielded zone at the center of the crazed zone is initiated around the crack tip.
However, there exist an intense damage strip along the crack wake and ahead of the crack tip, and a larger overall crazed zone in PP/SEP specimen.
In order to study the craze pathway into the structure of the semicrystalline polymer, etching of the i-PP(130) sample was performed after it was crazed in the presence of n-propanol.
The first three samples had a relatively large critical strain or did not craze at all, whereas the other samples crazed very well, more or less depending on the solvent used and the sample studied.
12] are independent elastic moduli of the crazed material.
A] uniquely characterizes the loading sensed by the crazed region ahead of the crack if the SSY condition Eq 1a is satisfied.