Experimental and numerical investigations are carried out to determine how thin steel plates with pre-cut defects behave under blast loading. The considered in this study represented by four square holes, symmetrically distributed around the centre of target plates. were manufactured from two types steel, i.e., a dual-phase medium strength high-strength martensitic steel. A shock tube facility ...

The aim of this research is to make a comparative study of numerical explicit time integration algorithms used in the domain of shock and impact. Numerical simulation of such problems, with explicit algorithms for time integration, involves very small time steps for reasons of stability, Thus, very high numerical frequencies can be found in the final solution in displacement or stress. But gene...

Johnson-Cook constitutive equation is one of the most famous constitutive equations that have ever been developed to model the hot deformation flow curves of different materials. This equation is a predefined model in the traditional finite element codes to describe the material behavior in applications such as simulating the manufacturing processes. In this work, two different genetic algorith...

Detailed finite element side impact dummy models of the USSID and EUROSID have been developed in cooperation with the German Association for Automotive Research (FAT) during the last 5 years. Both models are validated using tests at material and component levels as well as fully assembled models. The development of the LS-DYNA dummy models has been performed by the authors. Both models are used...

There are several techniques to simulate rebar reinforced concrete, such as smeared model, discrete embedded CLIS (constrained Lagrange in solid) and CBIS beam model. In this study, however, the interaction between concrete elements reinforcement is only simulated by model The efficiency accuracy comparisons investigated with reference analysis results both models provided LS-DYNA explicit fini...

Wrinkling and fracture are the important defects in deep drawing operation, which can be prevented using blank holding force (BHF) which has to be optimized as lower BHF promotes wrinkles formation and higher BHF promotes fracturing. Hence the limits of wrinkling and fracture have to be established. These limits depend on various tooling and process parameters. In this work the effect of toolin...

A finite cylindrical cavity expansion model for metallic thick targets with planar sizes, composed of ideal elastic-plastic materials, penetration high-speed long rod is presented by using the unified strength theory. Considering lateral boundary and mass abrasion target, resistance depth formulas are proposed, solutions which obtained MATLAB program. Then, a series different criteria-based ana...

The finite element method can be viewed as a machine that automates the discretization of differential equations, taking as input a variational problem, a finite element and a mesh, and producing as output a system of discrete equations. However, the generality of the framework provided by the finite element method is seldom reflected in implementations (realizations), which are often specializ...