such a temperature. Results showed that there was significant shrinkage, particularly at the hook end-spring junction. This indicates stress concentration, possibly the combination of residual stress from forming and the action of the spring. It was concluded that although there was residual stress, the fracture was due to a combination of the tensile stress from the spring action and the presence of the ketone solvent. See also Corrosion engineering Creep (deformation) Crocodile cracking Embrittlement Environmental stress fracture Forensic engineering Forensic polymer engineering Fracture Mechanics Season cracking Stress corrosion cracking Structural failure References Further reading Ezrin, Meyer (1996). Plastics Failure Guide: Cause and Prevention, Hanser-SPE. Wright, David C. (2001). Environmental Stress Cracking of Plastics RAPRA. Lewis, Peter Rhys, Reynolds, K. and Gagg, C. (2004). Forensic Materials Engineering: Case studies, CRC Press. Polymer physics Thermoplastics Polymers