Accession Number : AD0745116

Title :   Alleviation of Stress Concentration with Analogue Reinforcement,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING MECHANICS

Personal Author(s) : Chiba,Toshiaki ; Heller,Robert A.

Report Date : APR 1972

Pagination or Media Count : 61

Abstract : In order to reduce the stress concentration around a hole in a plate, new, analogue reinforcements instead of reinforcing rings were used in this investigation. In two of these specimens, reinforcements with different volume fractions were arranged to coincide with the stress trajectories for an infinite plate with a hole under uniaxial tension. Two other specimens contained straight rectangular-grid type reinforcements with different volume fractions. These 0.005 in. thick brass reinforcements were made by using a photofabrication method. Specimens were then prepared by sandwiching these reinforcemnts between two epoxy resin plates. The stress concentrations at the edge of the hole under uniaxial tension were determined by photoeleastic techniques. The measured stress concentration factors were compared with well known values for an infinite, isotropic, homogeneous plate containing a hole. A definite reduction in stress concentration was observed on specimens containing 'analogue' reinforcement. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, STRESSES), REINFORCING MATERIALS, FIBERS, ORIFICES, PHOTOELASTICITY, MANUFACTURING

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE