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|Title:||Void growth and damage ahead of a crack in pressure-sensitive dilatant polymers|
|Citation:||Chew, H.B., Guo, T.F., Cheng, L. (2006). Void growth and damage ahead of a crack in pressure-sensitive dilatant polymers. WIT Transactions on the Built Environment 85 : 501-510. ScholarBank@NUS Repository.|
|Abstract:||The deformation of amorphous polymers is highly sensitive to hydrostatic pressure and the plastic flow is non-volume preserving. Failure of these materials is often preceded by the formation of small crack-like defects known as crazes, bridged by the fibrils of the polymer. In this work, a population of discrete voids is placed ahead of a crack within a boundary layer configuration to study the effects of pressure-sensitivity a and plastic dilatancy β on void growth and damage in polymeric materials. Results show that high pressure-sensitivity significantly increases both the intensity and spatial extent of damage, which could promote crazing. These effects can be compounded as the deviation from the associated flow rule, |β- α|, increases. This study offers some evidence of pressure-sensitivity and plastic dilatancy as the major contributing parameters to the formation and growth of microporous crazing zones in polymers.|
|Source Title:||WIT Transactions on the Built Environment|
|Appears in Collections:||Staff Publications|
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