Accession Number:

AD0600612

Title:

THE NATURE OF POLYAMIDE DESTRUCTION DURING CONTACT STRESSES.

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1964-04-13

Pagination or Media Count:

8.0

Abstract:

A roller machine was investigated in which an experimental polyamide roller revolved, practically without slippage, and pressed against a steel roller. Fatigue destruction of the working surface of polyamides at contact loads occurring during free rolling is of a deep nature and shows up in the form of material peeling off about the whole circumference of the roller. For hard materials, at contact loads and with lubrication, fatigue destruction shows up in the form of sur face discoloration so-called pitting or pock-marked wear. On caprone rollers, in spite of abundant lubrication, pitting was not observed. At increased loads and rpms the models are destroyed as a result of increased heat generation in the material which leads to melting of the caprone in the maximal tangential stress zone. In testing the polyamides for contact endurance, it must be considered that their longevity depends upon load frequency whereas load frequency does not affect longevity of other types of plastics such, for example, as phenoplast. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE