Accession Number : AD0619678

Title :   A HIGH SPEED STRETCHING APPARATUS FOR OPTICAL STUDIES ON POLYMER FILMS.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST

Personal Author(s) : Erhardt,P. F. ; Fillmore,R. P. ; Yau,W. C. ; Keedy,D. A. ; Stein,R. S.

Report Date : 05 APR 1965

Pagination or Media Count : 25

Abstract : The report describes the design, calibration and operation of a pneumo-hydraulic high speed stretching apparatus in which a polymer film sample can be rapidly stretched from both ends. Provision is made for the concurrent measurement of stress and strain. The rise time of the piston velocity is approximately 4 msec. and the linear range covers 85-90% of the piston travel. At the maximum operating pressure of 1500 psi., stretching rates in excess of 4000 in/min are obtainable. The apparatus is equipped to take low angle light scattering photographs during rapid extension of the sample and subsequent relaxation. A continuous wave gas laser is used as source and a high speed motion picture camera as the detector. With appropriate polarization of the light beam the system is readily adapted to investigate birefringence changes on stretching, using a photomultiplier as the intensity detector. Instructions for operating the high speed apparatus are appended. (Author)

Descriptors :   (*POLYMERS, FILMS), (*TEST EQUIPMENT, POLYMERS), MECHANICAL PROPERTIES, OPTICAL PROPERTIES, STRESSES, STRAIN(MECHANICS), MEASUREMENT, HYDRAULIC EQUIPMENT, HIGH SPEED PHOTOGRAPHY, DEFORMATION, TEST METHODS, PLASTICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE