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Fire analysis and modeling
Published in Feng Fu, Fire Safety Design for Tall Buildings, 2021
LS-DYNA was capable of explicitly modeling failures, falling debris, and debris impact on other structural components. It could also model nonlinear and dynamic processes, including nonlinear material properties, nonlinear geometric deformations, material failures, contact between the collapsing structural components, and element erosion based on a defined failure criterion. In addition, LS-DYNA had capabilities to include thermal expansion and softening of materials. Therefore, it is used by NIST in their investigation on the World Trade Centre 7 collapse (Figure 6.16).
Precast segmental bridge construction in seismic zones
Published in Fabio Biondini, Dan M. Frangopol, Bridge Maintenance, Safety, Management, Resilience and Sustainability, 2012
Fabio Biondini, Dan M. Frangopol
The LS-DYNA solver is used for non-linear analysis of fast dynamic phenomena like blast or impact. Within the calculation, the FEM mesh can adapt by deleting elements whose resistance was depleted; these FEM elements “erode”.
Material and structural design based on biological information using optimized stress distribution
Published in Computer-Aided Design and Applications, 2018
Tetsuo Oya, Satsuki Tsunenari, Hayahide Nagase
In this study, we used two analysis tools to demonstrate the proposed method: One is LS-DYNA, which was used for inverse analysis and evaluation, and the other is LS-OPT, which was used for optimization. It should be noted that our method does not depend on specific software. One can reproduce the same results using arbitrary solver. LS-DYNA is a widely used commercial finite element (FE) solver that is able to carry out non-linear analyses, for instance, crash analysis, drop analysis, forming analysis, and so on. LS-OPT is an optimization environment that works together with LS-DYNA.
Numerical and experimental investigation on mechanical responses of plain woven CFRP composite under various loading cases
Published in International Journal of Crashworthiness, 2021
In fact, most built-in material models for composites in commercially finite element codes, such as LS-DYNA, RADIOSS, and PAM-CRASH, are phenomenological models based on lamina level. For example, LS-DYNA possesses over 25 material models suitable for mechanical characterisation of composite laminates. It is imperative to understand the limitations and applicability of these pre-existing models so that they can be better employed for the purpose of industrial application. Several studies have investigated the applicability of built-in models of commercial finite element codes. For instance, Feraboli and Boria [14, 15] examined the feasibility of LS-DYNA’s MAT54 for crush simulation of composite structures and the conclusion was that its predictive capability cannot be ensured since extensive calibration of model-specific parameters was required. Besides, whether the calibrated parameters in their research can be used for accurate simulation of other loading cases or not, needs to be further investigated. Xiao [16] pointed out the deficiency of constitutive law in LS-DYNA’s MAT58 which hindered the successful simulation of axial crush of braided tubes. As a result, the first peak load and average crush force of simulation were significantly under-predicted compared with experimental results. It should be pointed out that resin-based composites usually demonstrate the characteristic of inelasticity in the in-plane shear direction due to the plasticity of matrix, and the irreversibility should be accounted for in the composite models. McGregor [17, 18] investigated the applicability of a CDM-based model CODAM (MAT219) which uses a sub-laminate representation of composite and it was found that results of crush simulation correlated very well with experiments. However, it requires a set of complex procedure of parametric calibration which is not convenient for engineering application as well.