MODELLING AND ANALYSIS OF BODY STRUCTURES FOR A 5-DOOR CAR FIROZ KHAN #1 , N.AMARA NAGESWARA RAO #2 , RAFFI MOHAMMED *3 , Y.VENKATESH *4 # Department of Mechanical Engineering, Nimra College of Engineering & Technology. * Department of Mechanical Engineering, Ramachandra College of Engineering Eluru. 3 [email protected]Abstract— A vehicle body structure is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism. The car body structure fatigue damage is mainly caused by the vehicle dynamic response, which is usually expressed as stress or strain time history. Stress/Strain calculations for fatigue life estimation can be performed in the time domain or Frequency domain. The detail car body stress analyses with ANSYS were performed based on 3D Ls-Dyna and mode analysis is also performed here. Modal analysis is usually used to determine the natural frequencies and mode shapes of car body structure. Vibration and Crash Analysis of Car Body using Ansys is carried out and including dynamic, static, crash analysis and so on. The main objective of the project is to find fundamental characteristics like frequency, stress and displacement for different material and velocity influence in the car body structure. If the fundamental frequency is increased beyond our designable value, if possible engineering changes can be made in the car body structure. In the car body structure the factor of safety value may be a half of the factor of safety of the existing material. Car body design can be modelled by using Catia modelling software. Analysis can be analysed by using 3D LS-DYNA. This project is analysis done on some of the body structure components with different materials and concludes that these components withstand the loads and sudden impacts without deflection or distortion. The scope of the project involves, Discretisation of sheet metal components of 5 door Cab body. Creation of LS-Dyna model suitable for safety analysis. Prepare the Built Report. CATIA V5 is the modelling package used to model the body structure components and LS-DYNA is the analysis package used to carry out analysis. Keywords— LS-DYNA, CATIA V5 I. INTRODUCTION A vehicle body structure is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism. The core element of any car is the body structure. The car body connects all the different components; it houses the drive train and most importantly carries and protects passengers and cargo. The body structure needs to be rigid to support weight and stress and to securely tie together all the components. Furthermore, it must resist and soften the impact of a crash to safely protect the occupants. In addition, it needs to be as light as possible to optimize fuel economy and performance. Over the years, various designs have been used and each of them has its benefits and drawbacks. Until the 1930s, virtually every car had a structural frame, separate from its body. This construction design is known as body-on-frame. Over time, nearly all passenger cars have migrated to unibody construction, meaning their chassis and bodywork have been integrated into one another. The main functions of a body structure in motor vehicles are: 1. To support the vehicle's mechanical components and body 2. To deal with static and dynamic loads, without undue deflection or distortion. These include: • Weight of the body, passengers, and cargo loads. • Vertical and torsional twisting transmitted by going over uneven surfaces. • Transverse lateral forces caused by road conditions, side wind, and steering the vehicle. • Torque from the engine and transmission. • Longitudinal tensile forces from starting and acceleration, as well as compression from braking. • Sudden impacts from collisions. International Journal of Scientific Research and Review Volume 7, Issue 3, 2018 ISSN NO: 2279-543X http://dynamicpublisher.org/ 92
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MODELLING AND ANALYSIS OF BODY
STRUCTURES FOR A
5-DOOR CAR FIROZ KHAN#1, N.AMARA NAGESWARA RAO #2, RAFFI MOHAMMED*3,
Y.VENKATESH*4
#Department of Mechanical Engineering, Nimra College of Engineering & Technology. *Department of Mechanical Engineering, Ramachandra College of Engineering Eluru.