Measurement of residual stresses in injection-molded polymer parts by time-resolved fluorescence
✍ Scribed by Taiji Ikawa; Tohru Shiga; Akane Okada
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 204 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
Time‐resolved fluorescence properties of 9‐methylanthracene (9MAn) dispersed in film of polyvinylchloride (PVC) containing carbon black were studied under tensile loadings. The fluorescence lifetime of 9MAn decreased from 5.70 to 5.55 ns, whereas the stresses acting on the films increased from 0 to 3 MPa. The change in fluorescence lifetimes of 9MAn during the stress relaxation process showed that the fluorescence lifetimes were correlated with the stresses, not with the strains. The results suggest that 9MAn is a useful probe for monitoring stresses acting on the matrix. With the use of the fluorescence properties of 9MAn, the residual tensile stresses on the skin‐layer of PVC injection‐molded test pieces were estimated. The estimated residual stresses were about ∼ 1 MPa. The residual stresses were relaxed to 0 MPa with annealing at 100°C. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2600–2603, 2002