Abstract This paper suggests, improved higher order layer wise refined theory to the investigation of flawlessly wedged sandwich and composite beams with general laminate configurations. The analysis incorporates continuity assumption of inter-laminar shear stresses, in-plane and flexural displacements between the interfaces. The inter-laminar shear…
As an advanced structural ceramic, boron carbide is drawing more attention as a promising material with its low density and excellent mechanical strength. Granular flow is triggered by progressive fracture of boron carbide during high strain rate (104 – 105s-1) and high pressure (several…
Topology optimization has been demonstrated as an effective tool for identifying material architectures that achieve targeted or optimized effective properties at the bulk scale. This design approach is often referred to as inverse homogenization and has been demonstrated for a number of mechanical properties…
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…
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…
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…
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…
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 chief drawback of using the Material Point Method (MPM) for brittle failure is that a material cannot separate unless a crack has grown to at least one grid cell in thickness. We propose and will discuss a numerical methodology to construct a damage…
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,…
