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The mechanical response of blast-resistant vehicles, such as Infantry Fighting Vehicles (IFVs), Mechanized Infantry Combat Vehicles (MICVs), Armored Personal Vehicles (APVs), and Mine-Resistant Ambush-Protected (MRAP) vehicles, is crucial for their effective design. When designing armored vehicles, it is important to achieve a balance between rigid designs that transmit blast forces to the troop's cabins and softer designs that prevent excessive structure deformation hazardous to the troops. This study investigates the performance of V-shaped plates at different angles under blast loading. The focus is on modeling blast effects using the Conventional Weapon (ConWep) method and the Johnson-Cook material model. The material used for V-shaped protective plates STRENX700 (S690QL) armor steel is commonly used for blast protection in Anti-Landmine (ALM) Vehicles. The blast-wave induces large deformation, erosion, high strain rates, non-linear material behavior and fragmentation. The numerical simulation results are presented in the form of vertical displacement of the central node on the protective plate, von Mises equivalent stress, and equivalent plastic strain. [ABSTRACT FROM AUTHOR]

This paper presents a method for implicit stress integration of the Drucker—Prager material model with kinematic hardening. The stress integration of the material model is conducted using the incremental plasticity method, while the kinematic hardening of material is defined using nonlinear Armstrong—Frederick hardening. This type of granular material hardening occurs as a consequence of the cyclic loading effects, such as the seismic load. For this reason, this material model is used for the earthquake analysis in the soil mechanics. Yield surface of the material model changes its position under the cyclic loads in the stress space, whereas there is no change in the size of the yield surface in deviatoric plane. The developed algorithm of the material model has been implemented in the software package PAK. [ABSTRACT FROM AUTHOR]

The phenomenological SMA material model proposed by Lagoudas [1] is modified and implemented in finite element software PAK [2]. Critical thermodynamic force is derived to match implicit integration method. All variables are derived to depend on effective values of stress, strain and martensitic volume fraction. One scalar equation need to be solved in the integration point using trial stress direction for each time step. The integration in the trial deviatoric stress direction provides possibility to solve large strain problems using the algorithms developed for small strains. Two one-dimensional and one non-proportional large strain example verified accuracy of proposed modifications. (© 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

Integrated approach of physical modelling and numerical FE simulation to the strip ironing process of aluminium alloy is applied in order to investigate the material behaviour in the deformation zone depending on different influential parameters. An original strip ironing device is developed for this purpose and a series of experiments are carried out in laboratory conditions, by varying process parameters (die angle, friction conditions, workpiece and tool material etc.). FE numerical simulations of selected experiments are performed, with the same value levels of process parameter. It enables the comprehensive analysis of process physics, monitoring of coupled influence of different process parameters on material deformation and stress fields in the wall of workpiece. Numerical results show good agreement with experimental ones. [ABSTRACT FROM AUTHOR]