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Avoiding the GIGO Syndrome — Combining the Real and Virtual Worlds in Analysis of Polymer Product Failures
Book chapter

Avoiding the GIGO Syndrome — Combining the Real and Virtual Worlds in Analysis of Polymer Product Failures

John Moalli, Steven Kurtz, Robert Sire, Sanjeev Srivastav and Ming Wu
Plastics Failure Analysis and Prevention, pp 307-312
2001
DOI: https://doi.org/10.1016/B978-188420792-1.50042-1

Abstract

This chapter describes some common mistakes made in finite element analysis (FEA) studies and offer guidelines for effective use of FEA as a tool in the analysis of polymer products. FEA is a useful tool for product design and failure analysis; it is widely available and can provide useful insight into complex problems. However, results of an FEA are only as good as the input material properties boundary conditions. Because the mechanical properties of polymers are highly dependant on processing conditions, the use of actual, measured mechanical behavior as the best input for constitutive modeling of polymers is recommended. In order to effectively model material behavior in response to load, most FEA codes require input of at least a few material properties. Another problem that can be encountered when using specification sheet data is the limited amount of information available. If one restricts the model input to the modulus of elasticity and poisons ratio, the FEA can only simulate linear-elastic behavior until failure. Environmental conditions can also lead to time variant mechanical properties. A model that employs initial elastic constants for a material that becomes less stiff. Great care should also be taken to ensure proper application of input thermal and mechanical loads. Finally, FEA models should be validated by comparison of measured and predicted results from known load cases.

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