2025-04-09 09:00:00
The deformation behavior of BCC metal microstructures at high pressures has contributions from dislocation slip, deformation twinning, and phase transformation. The current efforts to investigate plasticity contributions in BCC metals are largely limited to real-time in situ x-ray diffraction (XRD) and single-crystal (sc) systems….
Conventional engineering design for structural materials relies on the implementation of large safety factors and inefficient overdesign. More modern approaches seek to develop metamaterials focusing on the topology. However, emphasis on material selection and metallurgy is needed to enable such optimized topological designs. A…
From Da Vinci to Galileo to modern experimentalists a variety of characterization methods have been introduced for investigating the fracture of materials. However, determining fracture properties of materials at small length scales, with complex shapes, under extreme environmental conditions, is still extremely challenging. This…
Experimental AFM images have shown that the structure of polyethylene (PE) is porous at the fibril length scale where the length and the diameter of existing voids are in the order of 1 µm and 0.1 µm, respectively. However, the effects of voids on…
Ultra-high molecular weight polyethylene (UHMWPE) is commonly utilized for ballistic protection due to its high strength to weight ratio. Commercially available UHMWPE sheet-stock is comprised of aligned fibers or films embedded in a thermoplastic polymer matrix. Fiber based UHMWPE sheet-stock typically consists of four…
Hard ballistic soft laminates (HBSLs) made from ultrahigh molecular weight polyethylene (UHMWPE) fibers and polyurethane (PU) matrix show higher ballistic protection per unit areal weight. Even though the damage mechanisms of soft-laminates are significantly different than inorganic fiber reinforced composites, penetration resistance and perforation…
Oblique ballistic impact into fiber-based composites has not been a topic for intensive research thus far, but recently is receiving more attention in applications. In this presentation, we want to present the results of experimental investigations and numerical simulations on oblique impact of two…
The embedded finite element technique provides a unique approach for modeling of fiber-reinforced composites. Meshing fibers as distinct bundles represented by truss elements embedded in a matrix material mesh allows for the assignment of more specific material properties for each component rather than homogenization…
Hard ballistic soft laminates (HBSLs) made from ultrahigh molecular weight polyethylene (UHMWPE) fibers and polyurethane (PU) matrix show higher ballistic protection per unit areal weight. Even though the damage mechanisms of soft-laminates are significantly different than inorganic fiber reinforced composites, penetration resistance and perforation…
