Abstract
Research and analysis of mechanical properties including crack propagation in a light composite material is currently very important because composite structures are gradually becoming an alternative material that allows a significant reduction in the weight of car parts. This leads to an increase in efficiency in transport vehicles. This article describes experimental as well as model analysis of damage to composite textiles during dynamic fracturing. The obtained information provides an approach to the complex problem of crack propagation in composite textiles intended for use in car seats. This is especially important from the point of view of safety, because during an accident a significant overload of the human body occurs and its kinetic energy can cause deformation of a breach in the composite textile. Therefore, identifying the direction of crack propagation is very important for the safety of passengers. Experimental studies have demonstrated that a dynamic breach is caused by the significant deformation of the tested sample. The distribution and direction of crack propagation in the sample was studied using a FEM model, based on the Griffith-Irwin criterion with nonlinear orthotropic properties of the composite textile.
Highlights
The current trends and efforts in the development of components and systems, especially for vehicles, include their innovation leading to weight reduction
The vectors of velocity and direction of momentum during crack propagation are shown in Figs. 12 and 13
This article deals with the description and modelling of crack propagation in a sample of hyper elastic composite textile which could be used as a reinforcing material in car seats
Summary
The current trends and efforts in the development of components and systems, especially for vehicles, include their innovation leading to weight reduction. The main parameters of structural optimization are primarily dynamic and static strength and durability. The problem lies mainly in the fact that this structural modification leads to a reduction in the weight of the seat frame construction, but the risk of deformation of the textile during an accident increases. The main objective of this paper was to perform an experimental analysis and to construct a simulation model describing the distribution of the limit state and the rate of crack propagation in a hyper elastic composite with textile reinforcement. Degradation may occur due to the creep properties of the material This can be caused by long-term acting forces (random loading by the human body, pre-stress of textile). It is possible to a certain extent to describe the stress intensity using FEM model simulation based on mathematical theories that use Griffith-Irwin criteria
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