2025-04-09 09:00:00
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…
The multi-axial damage behavior of brittle polymers is highly complex, involving a stark tension-compression asymmetry and strong pressure sensitivity. These aspects are challenging to predict via phenomenological tensor based damage models. Recognizing that these behaviors stem from various micro-scale damage mechanisms, this work presents…
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…
Rubbers are effective materials for mitigating shock waves and high-velocity impacts. Despite their potential benefits in these extreme applications, relatively few studies have rigorously investigated the penetration behavior of rubbers or their shock Hugoniots. Here, we present experiments that quantify the ability of a…
Ultra-High Molecular Weight Polyethylene (UHMWPE) fiber-reinforced composites are used as protective materials against ballistic impact due to their impressive properties such as their high strength and low weight characteristics. This work investigates the dynamic behavior of UHMWPE fiber-reinforced composite under ballistic and plate impact…
