Experimental and Numerical Study on the Protective Behavior of Weldox 900 E Steel Plates Impacted by Blunt-Nosed Projectiles

Section: Contributionsmentioning

confidence: 99%

Failure Analysis in Metallic Materials

Nobile

2023

“…The second breakthrough is fracture experiments conducted by Bao [68] and further interpretation [69] of their results, which emphasized that fracture properties of ductile materials are in general dependent onto both the stress triaxiality and the Lode angle. Since that time several elaborate fracture criteria have been developed [70][71][72][73], but as in the case of the aforementioned elaborate yield criteria these and other advanced fracture criteria are not widely employed [61,[74][75][76][77][78] even within uncoupled material models. The reason seems to be the same.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Dynamic Mechanical Properties of Q460D Steel

Huang,

Lin,

et al. 2023

Self Cite

The dynamic mechanical properties of Q460D steel were studied to facilitate an assessment of the impact resistance of building structures. In the present work, material performance tests of Q460D steel at different temperatures, strain rates, and stress states were conducted. Using a hybrid experimental–numerical approach, a modified Johnson–Cook (JC) constitutive relation, a modified Johnson–Cook (JC) fracture criterion, and a lode-dependent fracture criterion were calibrated. To validate the calibration, Taylor impact tests of Q460D steel rods onto rigid target plates were carried out in a one-stage light-gas gun system. Mushrooming, tensile splitting, and petalling failure modes were obtained as the impact velocity was increased from 191.6 to 422.1 m/s. A three-dimensional finite element model was built for the Taylor impact tests, and FE simulations were run using the material models calibrated. It was found that the FE simulations using the lode-dependent fracture criterion were reasonable in terms of the failure modes of the Taylor rods. In contrast, the fracture behavior of the Taylor rods was significantly underestimated using the lode-independent JC fracture criterion. Finally, the effect of anisotropy, strain rate sensitivity and yield plateau on the Taylor impact FE predictions were explored and discussed.

“…[50] contains experimental data for hundreds of projectile/target configurations and test conditions. Examples of numerical ballistic penetration models can be found in [51][52][53][54][55][56][57][58][59][60][61][62]. In general, ballistic perforation resistance strongly correlates to the target materials' strength and hardness values.…”

Section: Introduction 1ballistic Impact Modeling and Experimentsmentioning

confidence: 99%

Using an Internal State Variable Model Framework to Investigate the Influence of Microstructure and Mechanical Properties on Ballistic Performance of Steel Alloys

Peterson

Horstemeyer

Lacy

et al. 2023

An internal state variable (ISV)-based constitutive model has been used within a Lagrangian finite element analysis (FEA) framework to simulate ballistic impact of monolithic rolled homogenous armor (RHA) steel plates by RHA steel spheres and cylinders. The ISV model predictions demonstrate good agreement with experimental impact data for spherical projectiles. A simulation-based parametric sensitivity study was performed to determine the influence of a variety of microstructural and mechanical properties on ballistic performance. The sensitivity analysis shows that the lattice hydrogen concentration, material hardness, and initial void volume fraction are dominant factors influencing ballistic performance. Finite element simulations show that variation of microstructure properties could explain the reduced ballistic performance of high hardness materials previously documented in the literature. The FEA framework presented in this work can be used to determine material properties conducive to ballistic-impact resistance.