Modeling of Failure Mechanisms Using the True Stress-Strain Response of Polymeric Foam Materials

✍ Scribed by B.-H. Choi; A. Chudnovsky; K. Sehanobish

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 298 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.269

✦ Synopsis

Polymeric foams are widely used in various engineering applications. Understanding and quantitative modeling of foam load-displacement behavior is important for design and development of engineering structures with foams. In this paper we analyze three main micro-mechanisms of foam macroscopic deformation and failure using stress-truestrain diagram of loading cycle. Specifically, connection between 1) large reversible deformation and buckling, 2) large elasto-plastic deformation and 3) brittle fracture of individual cell structural elements on one side and macroscopic foam behavior on the other is discussed. Identification of specific micro-mechanism responsible for macroscopic behavior foam is suggested on the basis of detailed analysis of unloading part of stress-true strain diagram, i.e., strain recovery process.