|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Recent Developments in Biological, Structural and Functional Thin Films and Coatings
||Interface Mechanical Strength and Interface Elastic Constants Calculations in Thin Films of Polymer Composites, and Natural Materials
||Devendra Verma, Vikas Tomar
|On-Site Speaker (Planned)
A composite material fracture strength can significantly depends on the constitutive description of interfaces. A computational model of composite deformation separating main phase constitutive behavior from interface constitutive behavior is therefore needed. In this work, an epoxy interface between two unconfined phases is analyzed under quasistatic and dynamic loading conditions to obtain a description of interfacial constitutive response at strain rates from 10-2 to 103 s-1. Dynamic microscale impact tests are used to obtain stress-strain response as a function of strain rate by fitting it to the Johnson-Cook constitutive model. Based on the analyses of confinement effect, a new power law constitutive model is proposed to predict the interface deformation behavior with a dependence on both strain rate and interface thickness. Furthermore, the interface elastic constants are calculated based on the surface energy framework and are compared with the experimentally measured interface elastic constants using nanomechanical Raman spectroscopy.
||Planned: Supplemental Proceedings volume