Constitutive modeling of shape memory polymer based self-healing syntactic foam

✍ Scribed by We Xu; Guoqiang Li

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 751 KB
• Volume: 47
• Category: Article
• ISSN: 0020-7683
• DOI: 10.1016/j.ijsolstr.2010.01.015

✦ Synopsis

In a previous study, it was found that the shape memory functionality of a shape memory polymer based syntactic foam can be utilized to self-seal impact damage repeatedly, efficiently, and almost autonomously [Li G., John M., 2008. A self-healing smart syntactic foam under multiple impacts. Comp. Sci. [3337][3338][3339][3340][3341][3342][3343]. The purpose of this study is to develop a thermodynamics based constitutive model to predict the thermomechanical behavior of the smart foam. First, based on DMA tests and FTIR tests, the foam is perceived as a three-phase composite with interfacial transition zone (interphase) coated microballoons dispersed in the shape memory polymer (SMP) matrix; for simplicity, it is assumed to be an equivalent two-phase composite by dispersing elastic microballoons into an equivalent SMP matrix. Second, the equivalent SMP matrix is phenomenologically assumed to consist of an active (rubbery) phase and a frozen (glassy) phase following Liu et al. [