...Yunfei Liu; Zhaoye Qin; Fu-Lei Chu This study aims to improve the impact protection performance of composite structures by combining a honeycomb core with negative Poisson's ratio and graphene platelets reinforced (GPR) face sheets. The paper investigates the nonlinear repeated low-velocity impact...

... subjected to impact loads due to its brittle characteristics. Therefore, a steel-layered structure with different contact areas is developed as a stress wave attenuator to protect the fluid oscillator for the DTH hammer under high-temperature drilling conditions. In this paper, the stress wave attenuation...

...@eng.ox.ac.uk Contributed by the Applied Mechanics Division of ASME for publication in the J ournal of A pplied M echanics . 11 08 2022 26 10 2022 28 10 2022 18 11 2022 Hopkinson bar specimen geometry titanium alloys dynamic necking stress triaxiality impact...

... 2022 05 04 2022 12 05 2022 elasticity impact structures National Natural Science Foundation of China 10.13039/501100001809 52005331 Bio-implantable pressure sensors are attractive for many life-threatening clinical scenarios that require real-time monitoring...

...Hyunho Shin A process of calibrating a one-dimensional sound speed (c o ) and Poisson’s ratio (ν) of a (split) Hopkinson bar is presented. This process consists of Fourier synthesis and iterative dispersion correction (time-domain phase shift) of the elastic pulse generated by the striker impact...

... a ballistic setup where target plates were cooled down to as low as −60 °C before we present results from ballistic impact tests with three different projectile types. The ballistic limit velocities from tests at low temperatures were higher than the ballistic limit velocities from tests at room temperature...

...S. Pant; S. Tamboli; S. N. Khaderi A common method of generating a tensile wave in Split-Hopkinson bar experiments is to impact a hollow striker on an anvil/collar attached to the incident bar. When the anvil/collar is attached to the incident bar using screw threads, the incident signals usually...

... to be [1, 0]. As evident in Fig. 8 , this upper bound agrees well with the numerical results for a piston velocity of 150 m/s. The practicality of using an elastoplastic contact law to describe wave propagation for impacts beyond 150 m/s is not feasible as the granules lose their spherical shape due...

... and the need to make use of the available dynamic range of the imaging sensors. Further details are discussed in Sec. 2.3 . Figure 7 shows a sequence of images of the dot pattern when the striker impact speed is 17.4 m/s. The images were acquired at a rate of 4 million frames/s, but the sequence...

...Jasper Lienhard; David Veysset; Keith A. Nelson; Christopher A. Schuh At sufficiently high velocities, a microparticle impacting a metal substrate can cause ejection of material from the substrate and impact-induced melting, both of which can result in erosion. Here, we directly image the impact...

... dynamics computational mechanics flow and fracture impact mechanical properties of materials dynamics wave propagation Polyurethane and polyurea are two of the most widely used polymers for engineering applications, particularly in shock protection systems. For example, those polymers have...

...Shiyao Lin; Anthony M. Waas The low velocity impact (LVI)-induced damage of a highly anisotropic laminate [0/90/0/90 9 ] s has been studied experimentally and numerically. The purpose of the analyses of this laminate is that this stacking sequence resembles a sandwich composite panel, in the sense...

...Amartya Bhattacharjee; Anindya Bhaduri; Ryan C. Hurley; Lori Graham-Brady A micromechanical multi-physics model for ceramics has been recalibrated and used to simulate impact experiments with boron carbide in abaqus . The dominant physical mechanisms in boron carbide have been identified...

...M. A. N. Dewapriya; R. E. Miller Recent advances in experimental techniques have enabled impact tests of ultrathin films. For example, microprojectile impact tests of ultrathin polymer films have revealed that their specific penetration energy is about ten times more than that of the conventional...

...-body chains where the impulse wave generated by impact gets blocked before it reaches a contacting end. Email: hurmuzlu@smu.edu Contributed by the Applied Mechanics Division of ASME for publication in the J ournal of A pplied M echanics . 15 05 2020 29 07 2020 29 07 2020...

...N. Kumar; S. N. Khaderi; K. Tirumala Rao We investigate the normal impact of a rigid sphere on a half-space of elasto-plastic auxetic/metal foam using the finite element method. The dependence of the coefficient of restitution, peak force, maximum displacement, and contact duration on the yield...

...Yanhui Jiang; Hamid Nayeb-Hashemi Capture of a prey by spider orb webs is a dynamic process with energy dissipation. The dynamic response of spider orb webs under prey impact requires a multi-scale modeling by considering the material microstructures and the assembly of spider silks in the macro...

...Xuchen Wang; Mostafa Hassani With the advent of advanced testing techniques such as laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10 6 s −1 , a relatively less explored regime of strain rates. Inspired...

...Hrachya Kocharyan; Nikhil Karanjgaokar In the presented work, wave dynamics of 2D finite granular crystals of polyurethane cylinders under low-velocity impact loading was investigated to gain better understanding of the influence of lateral constraints. The deformation of the individual grains...

...Jan Sieber; John W. Hutchinson; J. Michael T. Thompson This paper investigates the robustness against localized impacts of elastic spherical shells pre-loaded under uniform external pressure. We subjected a pre-loaded spherical shell that is clamped at its equator to axisymmetric blast-like impacts...