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The effect of thermal history on the distribution of residual stresses in PMMA rods
Author(s) -
Mittal Ramesh K.,
Rashmi Vibhu
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070340217
Subject(s) - materials science , residual stress , composite material , birefringence , rod , ultimate tensile strength , polymer , extrusion , photoelasticity , residual , thermal , optics , solid mechanics , thermodynamics , medicine , physics , alternative medicine , pathology , algorithm , computer science
A nondestructive technique based on the photoelastic properties of transparent polymers has been used to monitor the distribution of residual stress components in circular rods of poly(methyl methacrylate) (PMMA). The influence of various thermal histories on these stresses as well as on the molecular birefringence has been determined. The technique has been further simplified to obtain the values of maximum tensile and compressive residual stresses with the help of just two photoelastic measurements. The stresses so obtained are within 10% of the values obtained using detailed experimental measurements and their analysis. The simplified procedure is, therefore, suitable for “on‐line” determination of residual stresses in extrusion industry.