2025-04-09 09:00:00
An experimental apparatus designed to measure the dynamic behavior of materials under strain rates around 10³ s⁻¹ and temperatures up to 800°C is developed in this study. The system builds upon the traditional Kolsky (split-Hopkinson pressure) bar setup, incorporating an external furnace to heat…
The specific energy absorption (Ep*) by a protective shield during projectile impacts depends on many factors, including material’s constitutive response, density, and layer thickness, deformation and failure mechanisms, and projectile’s shape, mass, and velocity. Laser-induced projectile impact test (LIPIT) allows testing sub-micron-thick materials with…
High-energy X-rays (HEX) above 60 keV are quite valuable, especially for partially or fully disordered materials, because they allow structural studies in both real and reciprocal space, while the moderate X-rays (e.g., 30 keV) can only be used to study the long-range periodic structure…
In continuum damage models involving strain softening, various Quantities of Interest (QoIs) such as energy dissipation are pathologically dependent on the discretization resolution (i.e. mesh size). For finite element methods, this is referred to as the mesh size sensitivity, implying lack of regularization. The…
Intergranular and transgranular fracture play a critical role in determining the fracture behavior and toughness of polycrystalline materials, such as metals and ceramics. These mechanisms are strongly governed by microstructural features, including grain size, grain shape, crystallographic orientations, and grain boundary properties. We present…
A 17 µm diameter UHMWPE fiber consists of over 100,000 fibrils with diameters ranging from 10 to 100 nm. These fibrils can exhibit various relative rotations around the axial direction, forming interphases between distinct crystal planes. Fiber failure often occurs through defibrillation, determined by…
In this study, an automated high-throughput Laser-driven Micro-flyer plate Impact (LMI) experimental system was used to investigate the spall strength of pure copper with grain sizes ranging from 10⁻⁹ to 10⁻⁵ m at varying strain rates and shock pressures. The samples were copper polycrystals…
High-velocity impact analysis is crucial in defense, aerospace, and materials science, involving scenarios like projectiles hitting vehicles and aircraft in dusty environments. These conditions lead to extreme pressures, high strain rates, and rapid temperature changes that affect material performance. The modeling of these conditions…
Digital volume correlation (DVC) of volumetric images acquired by in-situ X-ray micro-computed tomography (µCT) provides an effective technique to measure the internal deformations of a particle composite material under loading. In this paper, a particle composite is prepared by embedding idoxuridine (IDOX) crystals (size…
Laser driven micro flyer experiments were performed in order to investigate the role of microstructure in the dynamic performance and spall strength of Silicon Carbide. This work compares the conventional gas gun plate impact experiments with the higher strain rate laser shock experiments. Commercially…
