In this paper, an upper bound approach is used to analyze the tube extrusion process through rotating conical dies with large mandrel radius. The material under deformation in the die and inside the container is divided to four deformation zones. A velocity field for each deformation zone is developed to evaluate the internal powers and the powers dissipated on all frictional and velocity disco...

This paper describes the development of a numerical finite element algorithm used for the analysis of reinforced concrete structure equipped with shakes energy absorbing device subjected to earthquake excitation. For this purpose a finite element program code for analysis of reinforced concrete frame buildings is developed. The performance of developed program code is evaluated by analyzing of ...

In this paper, a physical and mathematical model of interaction between fabric expanding automobile airbag biological objects is formulated. Bioobjects are represented using finite element models anthropometric dummies the Hybrid III 50th Male type. As material, multi-layer orthotropic material was used. The method corpuscular particles used for numerical simulation functioning in LS-DYNA multi...

This work develops RVE-based finite element (FE) models to understand how the microstructure of Ultra-High-Molecular-Weight Polyethylene (UHMWPE) composites affects overall mechanical behaviour laminate. The represent a [0/90] configuration with random fibre packing sequence through thickness each ply, as well variation in cross-sectional shape fibres, both obtained from laminate cross section ...

We present the first version of a new declarative programming language. Dyna has many uses but was designed especially for rapid development of new statistical NLP systems. A Dyna program is a small set of equations, resembling Prolog inference rules, that specify the abstract structure of a dynamic programming algorithm. It compiles into efficient, portable, C++ classes that can be easily invo...

We propose an effective and flexible way to assemble finite element stiffness and mass matrices in MATLAB. The major loops in the code have been vectorized using the so called array operation in MATLAB, and no low level languages like the C or Fortran has been used for the purpose. The implementation is based on having the vectorization part separated, in other words hidden, from the original c...

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 ...

A STUDY OF TRACE-ELEMENT PARTITIONING BETWEEN PYROXENE AND ANGRITIC MELT: EQUILIBRIUM AND KINETIC EFFECTS INCLUDING SECTOR ZONING IN PYROXENE. G. E. Lofgren 1, A. J. Fahey2, and G. J. Wasserburg2, 'Mail Code SN4, NASA Johnson Space Center, Houston TX 77058, USA, 2Lunatic Asylum, Division of Geological and Planetary Science, Mail Stop 170-25, California Institute of Technology, Pasadena CA 91125...

* Corresponding author – [email protected] Tel: 414-229-4126 Fax:414-229-6958 ABSTRACT Understanding the fundamental tribology associated with the cutting of rock under extremely high pressure and high temperature (HPHT) conditions are extremely important in mining and drilling operations. In this paper, a rock fragmentation process is simulated during mechanical cutting of rock using an explicit...