Accession Number : AD0749971

Title :   Environmental Effects Related to Strength and Fatigue Properties of Boron-Aluminum Composites.

Descriptive Note : Technical rept.,

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : Rollins,Fred R. , Jr

Report Date : SEP 1972

Pagination or Media Count : 17

Abstract : It has been previously reported that water vapor exerts a very strong influence on the fatigue properties of boron-aluminum composites. Further investigation of this phenomenon has revealed that longitudinal splitting of boron filaments is the failure mechanism that is so strongly affected by water vapor. The splitting tendency is most prevalent in small diameter (0.10 mm) filaments, and it is primarily in composite material containing these filaments that water vapor effects are observed. Composite specimens which contain the larger (0.14 mm diameter) boron filaments are much less susceptible to changes in fatigue life induced by water vapor. (Author)

Descriptors :   (*COMPOSITE MATERIALS, ALUMINUM ALLOYS), (*BORON, REINFORCING MATERIALS), FATIGUE(MECHANICS), FRACTURE(MECHANICS), FILAMENTS, WATER VAPOR

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE