Fracture maps based on a ductility ratio that is a function of strain rate, temperature and geometry can be used to assess potential part failure due to impact or other severe loadings. Creep data presented as deformation maps provide useful geometry-independent design information where time and temperature are important design variables. For glass-filled injection-molded materials, the cross-flow stiffness and strength properties are sometimes only 50% of the flow properties and are sensitive to the specimen thickness. For cyclic loading situations, stress/cycles-to-failure information is used to assess lifetime of parts, while crack propagation data can be used if the initial defect size is known.
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References
1.
1. Trantina, G. G. and R. P. Nimmer. 1994. Structural Analysis of Thermoplastic Components, McGraw-Hill, New York.
2.
2. Woods, J. T. and R. P. Nimmer. 1996. "Design Aids for Preventing Brittle Failure in Polycarbonate and Polyetherimide,"Society of Plastics Engineers, 1996 Antec Proceedings.
3.
3. Hasan, O. A. and G. G. Trantina. 1996. "Use of Deformation Maps in Predicting the TimeDependent Deformation of Thermoplastics,"Society of Plastics Engineers, 1996 Antec Proceedings.
4.
4. Trantina, G. G. and P. R. Oehler. 1994. "Standardization-Is It Leading to More Relevant Data for Design Engineers?"Society of Plastics Engineers, 1994 Antec Proceedings.
5.
5. Hertzberg, R. W. and J. A. Manson. 1980. Fatigue ofEngineeringPlastics, Academic, New York.
6.
6. Trantina, G. G. and D. A. Ysseldyke. 1987. "An Engineering Design Database for Plastics,"Materials Engineering, 104:35-38.
