Accession Number : AD0764268

Title :   Removal of Microcracks of the 'Silver' Type by Surface Thermomechanical Treatment,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Prosvirin,V. I.

Report Date : 02 JUL 1973

Pagination or Media Count : 20

Abstract : The work has established that microcracks of the 'silver' type in polymethyl methacrylate are naturally removed during aging at ordinary temperature. These are cracks which have the appearance of silver streaks. The dependence between the number of disappearing microcracks and the time is direct. It was found that the development of microcracks may be related with the structural heterogeneity of the polymethyl methacrylate surface and the presence of stress concentrators localized in the microvolumes, commensurate with supramolecule formations.

Descriptors :   (*ACRYLIC RESINS, *CRACKS), HEAT TREATMENT, STRESSES, FRICTION, USSR

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE