Accession Number : ADA304558

Title :   Dynamic Stress Analysis of Smooth and Notched Fiber Composite Flexural Specimens.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Murthy, P. L. ; Chamis, C. C.

PDF Url : ADA304558

Report Date : 02 APR 1984

Pagination or Media Count : 28

Abstract : A detailed analysis of the dynamic stress field in smooth and notched fiber composite (Charpy-type) specimens is reported in this paper. The analysis is performed with the aid of the direct transient response analysis solution sequence of MSC/NASTRAN. Three unidirectional composites were chosen for the study. They are S-Glass/Epoxy, Kevlar/Epoxy and T-300/Epoxy composite systems. The specimens are subjected to an impact load which is modeled as a triangular impulse with a maximum of 2030 lb and a duration of 1 ms. The results are compared with those of static analysis of the specimens subjected to a peak load of 2000 Ob. For the geometry and type of materials studied, the static analysis results gave close conservative estimates for the dynamic stresses. Another interesting inference from the study is that the impact induced effects are felt by S-Glass/Epoxy specimens sooner than Kevlar/Epoxy or T-300/Epoxy specimens.

Descriptors :   *STRESS ANALYSIS, *FIBER REINFORCED COMPOSITES, *DYNAMIC LOADS, *EPOXY COMPOSITES, *UNIDIRECTIONAL, STRESSES, TRANSIENTS, IMPACT, COMPOSITE MATERIALS, RESPONSE, STATIC TESTS, NOTCH TOUGHNESS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE