composite pressure vessel cng made of epoxy – carbon material with nonmetal liner is 60% lighter than aluminum vessel under the same conditions. one of the important parameters in the pressure vessels design is their resistance against impact and prevention of explosion. in this paper, the effects of low velocity impact on composite pressure vessel are investigated using fe analysis. the vessel...

This research deals with axial and oblique impact crash tests on simple and hybrid composite tubes. Axial and oblique impact tests have been generated on simple and hybrid composite tubes with one, two and three layers. A drop test rig was used to conduct the experiments. Furthermore, in order to gain more detailed knowledge about the crash process, finite element simulations of the experim...

this research deals with axial and oblique impact crash tests on simple and hybrid composite tubes. axial and oblique impact tests have been generated on simple and hybrid composite tubes with one, two and three layers. a drop test rig was used to conduct the experiments. furthermore, in order to gain more detailed knowledge about the crash process, finite element simulations of the experiments...

Based on the microscopic structure of fiber-reinforced composite materials, a finite element analysis model was developed using LS-DYNA software to simulate damage carbon-ceramic brake discs under high-speed foreign particles impact conditions. The incorporated Chang-Chang failure criterion intra-layer and introduced material stiffness reduction scheme investigate process mechanism discs. resul...

The newly developed Yeh-Stratton (Y-S) Strength Criterion was used to study the failure of composite materials with central holes and normal cracks. To evaluate the interaction parameters for the Y-S failure theory, it is necessary to perform several biaxial loading tests. However, it is indisputable that the inhomogeneous and anisotropic nature of composite materials have made their own contri...

Methods of damage development analyses for various types of composite materials such as 3-D woven composite have not been established sufficiently because it is quite difficult to simulate the failure propagation. A FEM simulation of failure process of 3-D composite was executed by Mibayashi including the thermal residual stresses after the curing process, and the deformations and stresses calc...

Abstract In this paper, a general three-dimensional finite element model composed of eight-node three-dimension cohesive elements and solid with reduced integration for low-velocity impact analysis composite materials is established. Firstly, the continuum damage mechanics applied to simulate initiation evolution intra-laminar damage. Based on zone , are inserted between layers predict inter-la...

The probabilistic analysis takes into consideration an effect of scatter in elastic and strength properties of composite beam, and velocity of impactor. The damage model is implemented in the FE (finite element) code by a VUMAT (user-defined subroutine). The inter ply failure is modeled using cohesive surfaces between the plies. Dynamic response is obtained using explicit time domain integratio...