Crack Healing in Polymers.
Final rept. 23 Jul 79-1 May 83,
ILLINOIS UNIV AT URBANA DEPT OF METALLURGY AND MINING ENGINEERING
Pagination or Media Count:
The healing of cracks, crazes, voids and mechanical energy losses were studied in a variety of polymer materials. These included amorphous, crystalline, crosslinked polymers, block copolymers and both rigid and soft composites. Mechanical testing methods consisted of uniaxial tension, wedge cleavage, compact tension, fracture, lap shear joint fracture, single edge notch fracture, Izod impact and compact tension fatigue. The important problem to solve was that of strength development, sigma, at a polymer-polymer interface as a function of time, t, temperature, T, pressure, P, and molecular weight, M.