The Critical Strain of Plastics, in Particular of Chopped Strand Glass Mat Reinforced Plastics Under High Rates of Deformation 760176

Investigations of the mechanical behaviour of materials have proved the existence of critical strain limits for plastics. The exceeding of these limits leads to the formation of irreversible damages in the microstructure of the materials. Measuring procedures for the determination of the first material damages are pointed out and evaluated.
By means of a special example, the investigation of the microcracks development of a chopped strand glass mat reinforced UP-resin under uniaxial tensile loading up to high rates of deformation, it can be proved that even for extremely quick deformation processes, unequivocal determination of the critical strain is still possible.


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