2025-04-09 09:00:00
The behavior of energetic materials is significantly influenced by the density, spatial distributions, and morphologies of microstructure heterogeneities and voids. Void density can profoundly influence the shock-to-detonation transition (SDT) in polymer bonded explosives (PBX). Spatial non-uniformity of void density or void density gradients can…
Plate-impact experiments have been performed at the ID19 beamline of the European Synchrotron Radiation Facility on porous plates printed using SLM technique out of AlSi10Mg and Ti6Al4V. The samples contain a large population of voids with different sizes varying from 5 to 120 μm….
Ring expansion experiments demonstrate (Zhang & Ravi-Chandar, 2008) that fragmentation of thin structures is triggered inside strain localization loci (necks for ductile materials). In the literature, authors have analyzed strain localization with analytical approaches based on equivalent configurations: bars in dynamic extension, representative of…
Additively manufactured (AM) lattices are built via laser powder bed fusion (LPBF) utilizing 3D mm-scale complex, ordered, and long-range periodic computer aided designs. These designs combined with metallic construction materials give AM lattices a high tailorability and strength-to-weight ratios; attributes which are desirable for…
Unlike quasistatic fracture problems, the regularization of local damage models for dynamic fracture is not well understood. This knowledge gap is addressed here for two widely used regularization techniques viz. the crack band model (CBM) and rate dependent damage (RDD). Regularization effectiveness of CBM…
Spall fracture is a critical failure mode that occurs during highly impulsive loading in application areas such as ballistics and spacecraft shielding. During spall fracture, the interaction of shockwave rarefaction fans creates a region of high dynamic tensile stress inside the material and produces…
A key element in modeling and simulation of impact events is the prediction of constitutive nonlinearity for geomaterials undergoing extreme deformations that also induce widespread fracture, called rubbelization or shattering. This presentation introduces box-constrained optimization problems to describe rate-dependent bi-apex stress return algorithms (i.e.,…
Spalling is a fundamental damage phenomenon observed in materials under dynamic loading. Experimental adjustments in strain rates and shock pressures, achieved through variations in shock generation methods (such as mechanical impact or laser shock), allow for modifications in fracture properties. In ductile materials, the…
The intrinsic compression strength of ceramics can be difficult to measure. The specimen geometry and test fixture, if not properly designed, can result in the generation of undesirable tensile stresses that can lead to misleadingly low strength values. Since compression strength is a parameter…
The response of porous materials to shockwaves is an ongoing focal point for various industrial and military applications, including dynamic compaction of powders, the design of blast mitigation devices, and collision processes in the solar system. Additionally, with the advancement of additive manufacturing, incorporating…
