|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||W-26: Strain Rate Dependent Failure of Interfaces in Glass/Epoxy and Energetic Materials at Nano-Microscale via Dynamic Indentation
||Devendra Verma, Vikas Tomar
|On-Site Speaker (Planned)
The main factors contributing to the failure modes in composites are initiated at the interfacial sites. The interface mechanical strength is characterized using dynamic indentation experiments at strain rates up to 400 s-1. The experiments were conducted with indenters of radius 1, 10 and 100 μm on the interfaces of 1, 10 and 100 μm thickness within the spatial error tolerance of less than 3 μm. The interface thickness was also verified using the Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. The stress maps using Nano Mechanical Raman Spectroscopy (NRS) were also captured before and after the impact experiments to analyze the change in the stress distribution around interfaces. The Johnson-Cook constitutive model was fitted to the obtained interface normal-stress and normal-strain data based on the nano-impact experiments. Interfacial properties are affected by the rate of loading and are largely dependent upon the interface structural inhomogeneity.
||Planned: A print-only volume