Received 17 December 2019; accepted June 2020
 This work investigated the elastic responses of a composite laminate shell subjected to transverse low-velocity impact. The governing equation based on equations motion both impactor and target was developed detetrmine impact force. displacement unit impulse loading solved using finite element method. A non-linear differential in terms indenta...

We carry out molecular statics (MS) simulations to study the indentation process of Pt (1 1 1) surfaces using an indenter with radius 5–20 nm. The substrate and are either bare or graphene-covered. Our show that influence adhesion between tip can be significantly reduced by decreasing strength range atoms on indenter, enhancing stiffness. results suggest elastic response exhibits weaker after c...

Fracture modes in a model glass–polymer coating–substrate system indented with hard spheres are investigated. The large modulus mismatch between the glass and polymer results in distinctive transverse fracture modes within the brittle coating: exaggerated circumferential (C) ring cracks that initiate at the upper coating surface well outside the contact (as opposed to the near-contact Hertzian ...

In literature, the concept of material gradation is shown to inhibit surface crack initiation in glass/ceramic composites subjected Hertzian indentation. However, cracks could yet initiate due relatively higher loadings or presence flaws/defects. Hence, characterization graded concerning resistance against and propagation manifests itself as a prominent matter. this study, axisymmetric evolving...

We introduce the orbital-free density functional theory local quasi-continuum (OFDFT-LQC) method: a first-principles-based multiscale material model that embeds OFDFT unit cells at the subgrid level of a finite element computation. Although this method cannot address intermediate length scales such as grain boundary evolution or microtexture, it is well suited to study material phenomena such a...

Modeling of contact interfaces that inherently include roughness such as joints, clamping devices, and robotic contacts, is very important in many engineering applications. Accurate modeling of such devices requires knowledge of contact parameters such as contact stiffness and contact damping, which are not readily available. In this paper, an experimental method based on contact resonance is d...

Hertzian contact damage is studied in porcelain coatings (thickness range 250 μm to 1 mm) over a Ni–Cr alloy substrate, and glass coatings (thickness range 160 μm to 1 mm) on polycarbonate polymer substrates. Both planar and non-planar geometries are considered, subjected to indentation by spherical indenters of various sizes (radius range 2 mm to 8 mm). Finite element analysis is carried out t...

This is the first study to quantify the measurement error due to the physical thickness of Fujifilm for several material combinations relevant to orthopaedics. Theoretical and experimental analyses were conducted for cylinder-on-flat indentation over a series of forces (750 and 3000 N), cylinder diameters (0 to 80 mm), and material combinations (metal-on-metal, MOM; metal-on-polymer, MOP; metal...

The mechanical properties of compliant materials such as polymeric films and biological membranes that are of nanoscale in thickness are increasingly extracted from scanning probe microscope-enabled nanoindentation. These films are applied in various fields that require multiaxial loading conditions. The Hertzian contact models developed for linear elastic materials of semi-infinite thickness f...

The manuscript aims to report the results of investigation of wave propagation in a 1D chain of particles with randomly assigned masses. The particles are connected by longitudinal springs with power law dependence between the force and displacement. The exponent is assumed either 0 (conventional linear spring) or 0.5 (Hertzian contact). The manuscript however considers only linear contacts (ex...