Drop Weight Impact Behaviour of Tube Filled Polymeric Syntactic Foam

Yash M Chordiya,Manmohan Dass Goel

doi:10.3844/sgamrsp.2019.40.55

Yash M Chordiya, Manmohan Dass Goel

Open Access

https://doi.org/10.3844/sgamrsp.2019.40.55

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Abstract

Accidents are misfortune which could happen to anyone at any place at any time and it affects the vehicle as well as the occupants. Continuous research is being carried out for improving the crashworthiness of the vehicles with different materials. These materials plays important aspect in energy absorption and impact resistant design of the structure, wherein, presence of these materials highly affects the response of structures subjected to impact loading. In the present study, a non-linear finite element code LS-DYNA® is used for numerical simulation of drop weight impact hammer test. The material chosen for simulated testing is polymeric syntactic foam. In this study, effect of density of foam, foam material model, effect of drop height and effect of tube, filled with foam, on energy absorption of foam is studied. Herein, material model chosen for hammer is bilinear material model and crushable foam as well as piecewise linear plasticity model is used to model the foam. Behaviour of foam is compared in terms of reaction force, displacement time history and force-displacement variation. Energy absorption for each model is computed for different velocities considered in the present study and it is observed that tube plays an important role in enhancing the energy absorption of foam.

Highlights

There has been a tremendous increase in population of India and it ranks as second most populated country
Present investigation focuses on numerical simulation of drop weight impact test of polymeric syntactic foam considering the effect of density, velocity, effect of tube which is filled with foam and effect of material model used for foam using LS-DYNA®
The effect of tube in foam filled tube on reaction force time history for both the material models is considerable for densities 220 kg/m3 and 320 kg/m3 whereas for 460 kg/m3 slight change is observed for velocity of 6.26 m/s

Summary

Introduction

There has been a tremendous increase in population of India and it ranks as second most populated country. The foams have some voids present within it in the form of air or micro balloons which are specially induced during the formation of foam Because of these voids, cellular rearrangement takes place which helps in the improved energy absorption when subjected to impact. Cellular rearrangement takes place which helps in the improved energy absorption when subjected to impact These foams find their application in safety guards, packaging, automobiles, blast lining materials and helmets. Researchers tried different variations of drop weight impact test for obtaining material stress-strain curves. Present investigation focuses on numerical simulation of drop weight impact test of polymeric syntactic foam considering the effect of density, velocity, effect of tube which is filled with foam and effect of material model used for foam using LS-DYNA®. Considering effect of tube leads to improved energy absorption by the foam and same is investigated in the present study

20 Plateau region

Results and Discussion

Conclusion