Abstract To study the effect of off-axis initiation on shaped charge performance. The nonlinear finite element software LS-DYNA is used to simulate jet forming and armour-breaking process under different offsets (0.025~0.125D k , D diameter). A theoretical model established analyse lateral velocity distribution jet. results show that degree asymmetric collapse increase with offset. When offset ...

This paper extends previous work with Dyna, a class of architectures for intelligent systems based on approximating dynamic programming methods. Dyna architectures integrate trial-and-error (reinforcement) learning and execution-time planning into a single process operating alternately on the world and on a learned model of the world. In this paper, I present and show results for two Dyna archi...

The impact damage response of balsa core sandwich composite plates with S2-glass/ epoxy reinforced facesheets is evaluated by impacting them with a spherical steel projectile at single impact locations. The impact damage can significantly reduce the structural integrity and load bearing capacity of a composite structure. Under high velocity impact loading, laminated composites experience signif...

Summary Crashworthiness analysis with the so-called explicit FE programs such as LS-DYNA [1] has reached a very mature status such that the number of real physical tests e.g. in the automotive industry has been reduced considerably. Though the element technology in the explicit programs has been mainly dictated by efficiency the quality of the results of nowadays standard crashworthiness analys...

This research reveals the efficiency of seismic isolation system in the form of rubber-metal supports with different height buildings at multi component seismic impact. As an example, seismically insulated monolithic reinforced concrete 5, 9 and 16 story buildings are considered. The solution of the problem is obtained by a direct integration of the motion equations for an explicit scheme in fi...

 Thin-walled energy absorbers are used to reduce accident induced damages. In this study, thin-walled stainless steel structures in quasi-hemisphere geometry were subjected under quasi-static loading with Santam 150KN apparatus. Experimental results were compared with results of numerical simulations by LS-DYNA and it was shown that there is a good agreement between experimental and numerical r...

Abstract An alternative approach to calibrate material models is proposed. The entire displacement field of a specimen measured with DIC system was converted into boundary conditions by the Envyo® mapping software. These were imposed on all nodes in corresponding LS-DYNA® simulation model. In this way digital twin geometry and experimental kinematics obtained. Considering local stress equilibri...