In this review and discussion of future opportunities for research, we will explain the mechanical behavior of hexagonal close packed (HCP) metals and alloys, mainly Mg- and Ti-based, which have been subject to severe plastic deformation (SPD) processing. There will be four major points…
Primary blast injury is caused by the impact and propagation of the blast wave through the body producing damage to the internal organs and tissues. The incidence and severity of primary blast injuries have increased because of the increasing use and effectiveness of explosive…
The measured loading and unloading particle velocity time histories in shocked metals exhibit well known deviations from typical elastic-plastic response models that are often used to describe shockwave behavior in metals. For example, shock and release wave measurements in polycrystalline metals demonstrate significant departure…
The behaviour of ceramics, and more generally of brittle materials, depends strongly upon the microstructural features that determine the initiation and propagation of cracks. Therefore, the generation of numerical models representative of real microstructures, necessary for the correct simulation of the micromechanics, is of…
Concurrent in-situ flash X-ray radiography, Photon Doppler Velocimetry (pdv), and high-speed video using the ARL HIDRA provides microsecond-resolved information during ballistic impact experiments. Manual image analysis, although laborious and time intensive, provides characterization of dwell time, penetration velocity, and timing of break-out of the…
Hierarchical materials design provides opportunities for developing engineering materials with novel architectures that are yet to achieve in traditional approach of materials processing. Ice-templating is an emerging technique in which unidirectional solidification results in unique directionally porous materials, and the resulting material morphology obtained…
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…
Steels containing metastable austenite exhibit high strength and ductility as the transformation of the retained austenite to martensite upon straining leads to increased strain hardening and necking postponement. This so-called transformation induced plasticity (TRIP) mechanism is governed by the stability of the austenite which…
Ceramic materials possess a unique combination of structural material properties that make them attractive for use in ballistic impact protection systems. However, their unique characteristics also make their design and evaluation particularly challenging when compared to conventional materials. The high pressures and complex failure…
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…
