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In the case of PE materials, it has previously been reported that while thermal history can influence crazing and SCG resistance, performance is primarily governed by the molecular weight and comonomer distributions of raw materials [19].
At a later stage of loading (post-peak), multiple crazing continues to be the principal damage mechanism for both of the 10% and 30% LBA ratio specimens.
Given that the structural properties of the materials were not varied, the transition from crazing to shear therefore appears to depend on the state of the constraint.
Crazing is even more prominent as polymers find their way into applications where they are replacing metals.
To date, the effect of crazing on the mechanical properties of polycarbonate has been difficult to quantify since no standardized technique exists to quantify craze severity.
In this paper, based on the model of crazing with the presence of damage at a crack tip for polymers [12, 13], time-dependence of both craze-tip advance and thickening profile at the crack tip under creep is considered.
Previously, a wide variety of techniques have been employed to study crazing behavior in polymers.
Crazing deformation and shear yield deformation are well known as the main mechanisms absorbing the destruction energy of a polymer alloy.
It has been shown that toughening in rubber-modified PP can be achieved via crazing and shear yielding [9, 10, 12].
In some grades a single dominant craze is evident but in most tough grades multiple crazing occurs, Load is measured by using a standard load cell.