Measurement of residual stress during implant resistance welding of plastics

Joon B. Park; Avraham Benatar

doi:10.1117/12.57420

1 December 1991 Measurement of residual stress during implant resistance welding of plastics

Joon B. Park, Avraham Benatar

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.57420
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

The formation of residual stress during plastic welding can adversely affect the quality of the joint. Residual stress can reduce the solvent resistance of the polymer as well as the tensile strength and fatigue life of the joint. Therefore, it is vital to predict and measure the level of residual stresses. The formation of thermal and residual stresses during implant resistance welding of polycarbonate was studied. Thermocouples and an infrared temperature sensor were used to measure the temperature distribution and temperature history in the parts during welding. The formation of thermal and residual stresses was predicted using 2-D finite element analysis in conjunction with non-isothermal linear viscoelasticity for a thermorheologically simple material. The residual stresses in the parts were determined using both photoelasticity and moiré interferometry. Theoretical prediction of residual stresses were in good agreement with measurements.

Citation Download Citation

Joon B. Park and Avraham Benatar "Measurement of residual stress during implant resistance welding of plastics", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.57420

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