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Measurement of residual stresses in a Noryl telecommunications co–ordinate selector switch
Author(s) -
Golsby R. J.
Publication year - 1975
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1975.tb00157.x
Subject(s) - residual stress , photoelasticity , strain gauge , gauge (firearms) , materials science , polycarbonate , composite material , shrinkage , stress (linguistics) , residual , structural engineering , optics , engineering , metallurgy , mathematics , physics , linguistics , philosophy , algorithm , solid mechanics
The moulding residual stress level in a miniature non–metallic (Noryl) telecommunications switch was measured using strain gauge and photoelastic techniques. Strain gauge results were obtained using a modified Waisman and Phillips 1 layer removal technique, which indicated maximum residual stresses of the order of 650 lbf/in 2 (4.5 MN/m 2 ) and a considerable stress gradient in the cross section of the component. Photoelastic measurements were made on slices from components in polycarbonate which has the same mould shrinkage value as Noryl. The results showed a maximum surface residual stress of 240 lbf/in 2 (1.7 MN/m 2 ). Interpretation of the exceptionally high fringe orders observed, was very difficult and the validity of this application of photoelasticity is questioned.