Accession Number : ADA136334

Title :   Determination of the Effect of Strain Rate on the Mechanical Properties of Graphite/Epoxy Laminates.

Descriptive Note : Final technical rept. 1 Oct 80-30 Sep 82,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE

Personal Author(s) : Alper,J M

PDF Url : ADA136334

Report Date : 01 May 1983

Pagination or Media Count : 53

Abstract : The main objective of this program was to experimentally evaluate the effect of strain rate on graphite/epoxy laminates. Specimens representing four laminates ((O)24T, (+ or - 45)12S, (+ or - 45/02)3/90)S, and (+ or - 45/0/+ or - 45)2/+ or - 45/90)S) were statically tested in one of two environments, room temperature dry or elevated temperature wet (200 F, 1% moisture content) at strain rates in either tension or compression which yielded failure times of .1 sec, 1 sec, 10 sec, and 100 sec. Results indicate that the laminates are more strain rate sensitive under the elevated temperature wet environment and that laminates typical for Navy aircraft have a statistically significant strain rate effect only under the elevated temperature wet condition.

Descriptors :   *Epoxy laminates, *Graphite, *Strain rate, *Mechanical properties, Naval aircraft, Composite materials, Static loads, Strength(Mechanics), Test methods, Experimental design, Fatigue tests(Mechanics), High temperature, High humidity

Subject Categories : Laminates and Composite Materials
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE