Accession Number:

ADA162775

Title:

Contribution of Bending Energy Losses to the Apparent Tear Energy.

Descriptive Note:

Technical rept.,

Corporate Author:

AKRON UNIV OH INST OF POLYMER SCIENCE

Personal Author(s):

Report Date:

1985-12-01

Pagination or Media Count:

40.0

Abstract:

When a strip is torn, energy is expended both in tearing it and in propagating a bend along each torn section. Estimates are given of the contribution of bending energy losses to the apparent tear energy. Experiments with highly-dissipative semi-crystalline polymers, torn with controlled amounts of bending, are then described. The bending energy losses ranged from 5 to 70 percent of the total tear energy, depending upon the degree of bending imposed, the thickness of the strip, and the extent to which it had been partly cut through before tearing. These results were in satisfactory agreement with approximate theoretical estimates. When the torn strips were allowed to take up naturally bent configurations under the action of the tearing force, then the contribution of bending energy losses to the apparent tear energy became rather independent of the strip dimensions and depended principally upon the dissipative nature of the material, represented by the fraction H of deformation energy that is not recovered. Keywords Fracture energy Plastics Rubber.

Subject Categories:

  • Plastics
  • Elastomers and Rubber
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE