In material sciences, fatigue is a well studied process by which an object is weakened by cyclic loading. It is understood that crack enucleate in zones where the stresses, caused by the loading, concentrate. These cracks can then grow at every loading cycle until…
Knowing the compression strength of advanced ceramics at high strain rates is of interest for many applications. The most common method of obtaining a dynamic compression strength value is the split-Hopkinson pressure bar (SHPB) method. Unfortunately a standard test methodology with a standard specimen…
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…
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…
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…
We describe a micro-flyer launcher apparatus driven by a 1064μm Nd:YAG pulse laser and use the apparatus for spall strength measurement. We demonstrate the capability to interrogate spall strength of thin AZ31B magnesium alloy films. Due to the complex wave interactions between the flyer…
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…
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…
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…
