Dielectric elastomers (DEs) are soft materials that polarize in the presence of an electric field. Using statistical mechanics, the thermodynamics of a DE chain subject to electrical loading and kinematic constraints is investigated. The equations of the monomer orientation density and the approximate chain…
Microstructural tunability enables cellular materials to outperform their solid counterparts in functionality and relative (mechanical) properties. However, these materials are typically optimized for specific conditions and slight changes in these conditions can cause significant losses in performance. In this work, we develop an active…
Under plate impact experiments (uniaxial strain) single crystal explosives exhibit elastic-plastic mechanical behavior, however at quasi-static rates (uniaxial stress) they are brittle. We have conducted Split-Hopkinson Pressure Bar (SHPB) experiments to bridge the strain rate gap between the two extremes in an effort to…
Solids usually break (fragmentize) into many pieces under high rate loading. Grady and co-workers have proposed one-dimensional theoretical models to estimate the average size of the fragments created in a brittle or a ductile fragmentation process. The fragment size formula for ductile materials is…
Dr. Ramesh has influenced our understanding of fracturing in planetary science in two fundamental ways. First, he has contributed to modernizing views of dynamic fracture employed in planetary science while investigating impact cratering. As evidenced by the number of craters seen on the moon,…
A deep learning model is simply a function that maps a given input to a desired output. In spite of the simple nature of a deep learning model, over the past decade it has revolutionized natural language processing and image understanding. One can name…
The aim of this study is to identify the different interfacial failure mechanisms between single S-2 glass fiber and Kevlar KM2 fiber reinforced polymer composites. Two imaging views are used to obtain the crack profile and the failure modes: high-speed imaging and scanning electron…
The evolution of the elastic precursor wave has long been a focus for the study of yielding during intense dynamic loading, as it signifies the time-dependent movement and generation of dislocations at the onset of plastic flow. Previous studies of precursor decay have mostly…
Bulk topology is known to produce remarkable variety in mechanical response. However, less investigated is the effect of surface topological features. Soft substrates can be endowed with non-traditional properties by using topological features on their surfaces. When such features are stiff and plate like,…
Manufacturing and testing procedures for cellular materials with optimized seismic isolation properties to be used for vibration control of civil structures and infrastructure are presented. Different manufacturing processes have been investigated for the creation of cellular materials with a wide range of properties and…
