Based on the coupled thermo-mechanical model, a constitutive model for bulk metallic glasses (BMGs), which is generalized to the multi-axial stress state and considers the effects of free volume, heat and hydrostatic stress, has been modified in the present paper. Besides, a failure criterion of critical free volume concentration is introduced based on the coalescence mechanism of free volume. ...

Bridges are often built in locations susceptible to multiple extreme hazards. Meeting some or all of these constraints drives the development of innovative multi-hazard design concepts. This paper presents the results of research conducted to develop and experimentally validate such multi-hazard bridge pier concepts. The first concept is a pier-bent made of concrete filled steel tube columns. F...

A Functional Bayesian (FB) methodology is introduced for the calibration of constitutive parameters spatially distributed within a model. The probabilistic solution to the inverse problem consists of assimilating the uncertainty captured from the actual material responses into the material parameters. A case study is introduced to illustrate the applicability of the method, where a soil model b...

Hot pressing process is very popular for thin plates in metal forming. However, the process mechanism for thick plates of high strength steel at high temperature deserves more investigations. The process is characterized by thermo-mechanical behaviors, three-dimensional unsteady deformations and high nonlinearity. In this paper, the model of the process for manufacturing large and thick blades ...

Modelling quasi-static crack growth with interface elements is a widely accepted technique [1-2]. Interface elements are inserted into the finite element mesh along possible crack paths. The interface elements are characterised by a traction-displacement curve. When a specific maximum stress is reached, the interface element undergoes a softening process until the critical fracture energy has b...

The energy absorbing capability is one of the most important aspects of crushing behavior of a structure subjected to axial impact. In this paper, a simple practical method is introduced to enhance the crushing behavior of this kind of structure. The axial impact of metallic energy absorbing thin-walled tubes with special shaped cross-section is simulated using LS-DYNA software. The effect of c...

The phase field method integrates the Griffith theory and damage mechanics approach to predict crack initiation, propagation, and branching within one framework. No crack tracking topology is needed, and complex crack shapes can be captures without user intervention. In this paper, a detailed description of how the phase field method is implemented with explicit dynamics into LS-DYNA is provide...

Investigations of the mechanical behaviors paperboard packaging materials has propelled to forefront industries owing anisotropic behavior materials. Paperboard undergo tensile forces during creasing and folding operation. Therefore, knowledge material properties it is undeniably important perform operation without tearing layers. Anisotropic required be addressed for used effectively efficient...

This paper extends previous work with Dyna a class of architectures for intelligent systems based on approximating dynamic program ming 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 tect...