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The key to any successful part development is the proper choice of material, process, and design matched to the part performance requirements. Understanding the true effects of time, temperature, and rate of loading on material performance can make the difference between a successful application and catastrophic failure. This article provides examples of reliable material performance indicators and common practices to avoid failure. Simple tools and techniques for predicting part mechanical performance integrated with manufacturing concerns are demonstrated. The manufacturing concerns include flow length and cycle time. The article describes the prediction of mechanical part performance for stiffness, strength/impact, creep/stress relaxation, and fatigue.

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G.G. Trantina, Design with Plastics, Materials Selection and Design, Vol 20, ASM Handbook, Edited By George E. Dieter, ASM International, 1997, p 639–647,

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