Impact Attenuator Optimum Design for a FSAE Racing Car by Numerical and Experimental Crash Analysis
- PDF / 681,250 Bytes
- 10 Pages / 595 x 842 pts (A4) Page_size
- 11 Downloads / 249 Views
ght © 2020 KSAE/ 11801 pISSN 12299138/ eISSN 19763832
IMPACT ATTENUATOR OPTIMUM DESIGN FOR A FSAE RACING CAR BY NUMERICAL AND EXPERIMENTAL CRASH ANALYSIS Ludovica Coppola, Bruno De Marco, Vincenzo Niola, Aleksandr Sakhnevych and Francesco Timpone* Department of Industrial Engineering, University of Naples Federico II, Napoli 80125, Italy (Received 11 June 2018; Revised 14 August 2019; Accepted 9 December 2019) ABSTRACTOne of the most important requirements of the Formula SAE (Society of Automotive Engineers) race car design competition is that the car structure must guarantee a high protection level in case of frontal impacts, by preventing intrusions into the driver foot zone or dangerous deceleration levels. These functions are mainly performed by the impact attenuators, which have to guarantee a high specific energy absorption capacity (SEA) and in order to preserve vehicle performances, have to be as light weighted as possible. The aim of this study is the design of an impact attenuator, to be mounted on a Formula SAE car, which main purpose is to obtain the optimal crash energy management, maximizing the absorbed energy and optimizing the geometry. The outcome of the study highlights that the absorber structure made up of honeycomb sandwich panels (primary energy absorbers), realized by means of different aluminium alloys employing an innovative design considering particular geometrical cavities within the structure, could lead to reduce the overall weight and to achieve a more progressive deformation during the impact. KEY WORDS : FSAE impact attenuator, Johnson Cook model, Honeycomb sandwich panel, Numerical simulation, LSDYNA, Crash behaviour, Drop test
1. INTRODUCTION
contribute to improving the acceleration performance of vehicles. In this paper is developed the design of a frontal crash absorber for a formula SAE competition vehicle whose main aim is to protect the driver during a frontal crash. The criterion followed in the design is the crash energy management (CEM): the system (crash box) has to absorb the kinetic energy released during a collision and to transfer a low and possibly uniform load to the system driver-vehicle, collapsing in a controlled way, allowing simultaneously to decrease gradually the acceleration experienced by the driver to reduce the risk of injuries (the acceleration’s average value has to remain below the normative limit). This means that the impact energy has to be absorbed gradually and entirely: gradually, in order to keep a low deceleration value during the whole impact phase; entirely, in order to avoid a contact between the vehicle’s frame (or the driver) and the obstacle. So, in order to minimize the impact’s damages, it is necessary to dissipate the energy deriving from the collision by absorbing it through the planned progression of the crash box deformation. To reach this objective the absorbers are often made by metallic foams or by honeycomb sandwich panels. Actually this kind of material’s structure has the capability to absorb gradually high energy's levels
Data Loading...
