Comparison of Impact Duration Between Experiment and Theory From Charpy Impact Test

N.B Muhammad Said,M.A.M Daud,M.B Ali,K.A Zakaria,S Sharif,S.A Zainol Murad,M.F Ghazali,N Mat Saad,M.M Ramli,M.M.A.B Abdullah,S.S Mat Isa,S.Z Abd Rahim

doi:10.1051/matecconf/20167801054

Abstract

This study presents the comparison of impact duration between experiment and theory from impact signal through a Charpy test. Recently, the number of accidents on the highway has been increased and it depends on the impact duration of material that have the ability to provide adequate protection to passengers from harmful and improve occupant survivability during crash event. Charpy impact test was implemented on different material and thickness but at the same striker velocity. Impact signal is obtained through the strain gauge that has been installed to striker hammer and connected to frequency data acquisition system. Collected signal is then analysed to identify the time period during impact before fractured. Result from both experiment and theory shows an increment to the impact duration as thickness is increased. Charpy test shows that aluminium 6061-T6 has a higher impact duration compared to carbon steel 1050.

Highlights

Impact on a body is occurring in a very short period of time with very large of force is imposed
According to Oztas [1], vehicle collision on highways can be classified as headon collision, front-to-back collision and eccentric collision and impact of that collision is strongly depends on the vehicle velocity, mass and material of the vehicle is made of
Charpy test results show an increment in impact duration when the thickness of the specimen was increased which is about 24% for aluminium and only 12% of carbon steel

Summary

Introduction

Impact on a body is occurring in a very short period of time with very large of force is imposed. Crashworthiness is an aspect that always becomes major attention in the automotive field because its ability to protect passengers from damage and improve occupant survivability during crash event. Strength and toughness often combined to indicate the amount of energy absorbed during the deformation and fracture. The design for crashworthiness is a tough task in a design process often involves non-obvious decisions since the structure has to be strong enough in some zones to prevent passengers, yet sufficiently compliant in other zones to absorb the crash energy [12]. Vehicle that is made from material with high impact duration is more safe since there are extended crush spaces for car protection which can reduce the damage either to car structure or occupant [7]

Objectives

Methods

Findings

Discussion

Conclusion