Accession Number:

ADA114298

Title:

Crack Velocities in Natural Rubber.

Descriptive Note:

Technical rept.,

Corporate Author:

AKRON UNIV OH INST OF POLYMER SCIENCE

Personal Author(s):

• Gent,A. N.
• Marteny,P.

Report Date:

1982-05-01

Pagination or Media Count:

31.0

Abstract:

Measurements are reported of the limiting velocity of a running crack in biaxially stretched sheets of unfilled and carbon-black-filled natural rubber. Author The crack velocity was found to increase with the cleavage stain ey and also with the strain ex parallel to the direction of tearing, reaching values of over 100ms at the highest strain levels employed. These crack velocities are shown to be close to those predicted by Motts theory, i.e., about one-third of the velocity of sound, when a strong strain-dependence is recognized for the velocity of a sound in rubber.

Descriptors:

• *Natural rubber
• *Crack propagation
• Cracks
• Velocity
• Strain(Mechanics)
• Fracture(Mechanics)
• Sound transmission
• Mathematical models

Subject Categories:

• Elastomers and Rubber
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE