Accession Number : AD0623049

Title :   A BONDED POLARISCOPE FOR THREE-DIMENSIONAL PHOTOVISCOELASTIC STUDIES.

Descriptive Note : Final rept.,

Corporate Author : ALLIED RESEARCH ASSOCIATES INC CONCORD MASS

Personal Author(s) : Becker,Herbert ; Papirno,Ralph

Report Date : 10 DEC 1964

Pagination or Media Count : 34

Abstract : A method of incorporating an internally bonded polariscope has been developed for use with viscoelastic materials. The newly developed technique serves to isolate one or more planes in a three-dimensional model so that a three-dimensional photoviscoelastic analysis can be performed. The model may be subjected to a variety of loadings at room temperature and only the photomechanical effects in the isolated plane will be observable. In the experimental program a viscoelastic cement was developed whose mechanical properties matched those of a chosen model material. The cement was used to bond the polarizing sheet into the model. The restraining effect of the stiff elastic Polaroid sheet was reduced by cutting a gridwork of slits into this material. Tests performed on simple disk models and on star grain rocket models containing bonded polariscope elements showed structural continuity through the cemented joint. The fringe pattern observed through the bonded polariscope in star grain models was the same as that observed using a conventional polariscope. On the basis of the favorable test results the newly developed technique was judged acceptable. (Author)

Descriptors :   (*POLARISCOPES, BONDING), (*VISCOELASTICITY, TEST METHODS), TEST EQUIPMENT, ADHESIVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE