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IRJET- Crash Analysis of Four Wheel Vehicle for Different Velocity
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1530 Crash Analysis of four wheel vehicle for different velocity G D Lohith Kumar1, H S Manjunath2, N Shashikanth3, Venkatesh Reddy4 1 Dept of Mechanical Engineering, Dr. Ambedkar Institute of Techn ology Bangalore, India 2,3,4 Assistant Prof. Dept of Mechanical Engineering, Dr. Ambedkar Institute of Technology Bangalore, India ------------------------------------------------------------------------------***--------------------------------------------------------------------------- Abstract:- With the improvements in roadways and implementation of new design technologies to automobiles, vehicle safety has found a tremendous turn in these days. Even then automobile community is making its continuous effort to improve automobile safety to reduce injury and death drastically. In the present work one such effort is showcased by carrying out crash analysis of hatch back car at different velocities using ANSYS Explicit Dynamics approach. Structural Steel wall was used as the obstacle and aluminium alloy was chosen as the body material for car model. It was seen that at low velocity majority of the impact force was absorbed by the front part of the car with slight deformation. But at high velocity, impact resulted in permanent deformation of the car model. The extent of plastic deformation of the car increased with increase in velocity with front part of the car absorbing the major part of the impact energy, Bumper, bonnet, A pillar and wind shield were the major parts to undergo plastic deformation. Also from the energy graphs it was clear that internal energy increased drastically and the kinetic energy decreased during the course of impact. After the impact the car body rebounds back and regains its kinetic energy, while the internal energy decreases. Keywords— Small wind turbine;static analysis;Catia V5; ABAQUS. 1. INTRODUCTION With increase in fuel price and need for safer vehicle, it is important to analyse the crashworthiness of automobile structure. Crashworthiness can be defined as the capability of a structure to safeguard its passengers during an impact. Based on the nature of impact and the type automobile involved in the crash, different parameters are used to determine the crashworthiness of the structure. Crashworthiness can be analysed either computationally, i.e. using computer tools such as MADYMO, PAM-CRASH, MSC Dytron, LS-DYNA or by experimental method. 1.1 Crash Test In order to assure safety for different modes of transports or its related components and systems, proper design standards are maintained and destructive tests are performed to check for crashworthiness. This procedure of testing the automobiles and their component by destructive method is known as crash test. proper design standards are maintained and destructive tests are performed to check for crashworthiness. This procedure of testing the automobiles and their component by destructive method is known as crash test. 1.1.1 Types of Crash test A. Frontal Impact Tests: This is the most common type of crash test. In this method vehicles are made to hit solid wall, usually made up of concrete, at different speeds. This type of crash test can also be carried out between two vehicles colliding each other. Figure 1: Frontal crash test carried for Honda Odyssey 2012. Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1531 B. Moderate Overlap Tests: This crash test is similar to Frontal Impact crash test, but only a small portion of the front part of the car impacts or hits the wall. These types of tests are important because the impact forces remain same during the collision but the area available to absorb the impact force is smaller. C. Small Overlap Tests: In this type of test, only small part of the vehicle body or the structure hits the barrier such as tree or a pole. This is the case of impact where the vehicle structure experiences more impact force per square metre of area and is the most demanding crash test among all the tests. D. Side Impact Tests: In this type of test a stationary test vehicle is fixed on the driver side and high velocity moving barrier which is deformable is made to hit the test vehicle at 90 degree angle on the driver side. Figure 2: Dodge Grand Caravan 2018 Side impact test E. Roll-over tests: This type of test is carried out to check the ability of the pillars and the roof held by those pillars to withstand the impact during vehicle roll over due to collision. F. Old Versus New: It is important for the automobile manufacturing companies to test for advancements in their new generation car models as compared with old generation car models for crashworthiness. Usually big and old cars are compared against small and new cars of different generations. Figure 3: NHTSA research crash test carried on two Ford 500. G. Computer Model: Due to heavy cost involved in the full scale crash tests, engineers usually choose low cost simulation techniques using computer tools to check for crashworthiness. Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1532 Figure 4: Simulation of car crash H. Sled Testing: This kind of test is carried for examining vehicle components such as seat belts and airbags and is the most cost effective method. 1.2 Basic Definitions: A. Stress: The intensity of internally distributedforces that tend to resist change in shape of a body is known as stress. 𝑆𝑡𝑟𝑒𝑠𝑠=𝐹𝑜𝑟𝑐𝑒/𝐴𝑟𝑒𝑎 𝜎=(𝑃/𝐴) 𝑁/𝑚𝑚2 B. Strain: Change in length per unit length in linear dimension of a body is known as strain. 𝑆𝑡𝑟𝑎𝑖𝑛=𝐶ℎ 𝑎𝑛𝑔𝑒 𝑖𝑛 𝑙𝑒𝑛𝑔𝑡ℎ/𝑂𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑙𝑒𝑛𝑔𝑡ℎ 𝑒=𝜕𝐿/𝐿 C. Elastic Range: The greatest stress up to which material exhibits the characteristics of regaining its original shape and dimensions on removal of load is known as elastic range. D. Hooke’s law: It law states that when a material is loaded within its elastic limit, the stress is directly proportional to the strain. 𝑆𝑡𝑟𝑒𝑠𝑠 ∝𝑆𝑡𝑟𝑎𝑖𝑛 𝜎∝𝑒 𝜎=𝐸𝑒 Where, E – Young’s modulus in N/mm2 σ – Stress in N/mm2/ e – Strain E. Deformation: In continuum mechanics, transformation of a system/ body from a reference shape to a current shape is called as deformation. It may be caused due to application of external load, gravity, electromagnetic forces, temperature changes etc. F. Directional Deformation: The displacement of the body in a particular axis or user defined direction is known as directional deformation. Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1533 G. Total Deformation: Total deformation is the vector sum of all directional displacementsof the systems H. Plastic Deformation: Plastic deformation can be defined as permanent deformation occurring due to application of sufficient load which results in permanent change in size or shape of a body. It is also known as plasticity. Some basic materials which can experience plastic deformation are metals, plastics, rocks, concrete etc. I. Elastic Deformation: Elastic deformation is defined as the temporary deformation of material’s shape, in which the material regains its shape after the removal of load. This phenomenon can be seen in metals and ceramics when stressed below elastic 2. METHODOLOGY In order to simulate crashworthiness of a chosen scaled down sedan car model ANSYS Explicit dynamics tool is used. This typical simulation methodology involves 1. Creation of Geometry (Sedan Car model and Wall) using CATIA V5 modelling tool. 2. Meshing the Geometry. 3. Setting up interaction and boundary conditions. 4. Solving the non linear dynamic response of car model with respect to time at different velocity. 5. Examining the results obtained using the ANSYS post processing tool 3. COMPUTATIONAL ANALYSIS OF CAR CRASH 3.1Geometry Creation In the present work, since the main objective was to simulate the car crash to know the material behaviour at different velocities and at different intervals of time, wheels were neglected, so that the simulation becomes simple. Scaled down model of a commercially available Sedan car was chosen for analysis having the Length= 0.22m, Width =0.15m and Height = 0.1 m. The wall was modelled with a dimension having Length = 0.1m, Height = 0.15m and thickness = 0.01m. The initial distance between the car model and the wall was made to be 0.1m. Fig- 5(a): Sedan car model Fig- 5(b): Sedan car model Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1534 Table 1: Geometry Details Table 2: Geometry Parts details Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1535 3.2 Meshing Figure 6: Tetra Meshed Sedan Car Model Meshing process was carried out in ANSYS Workbench. Auto mesh was generated, with the elements of car model being tetragonal in shape and that of the wall being hexagonal in shape. Total number of nodes and elements were found to be 4338 and 7937. Table 3: Mesh Details 4. RESULTS AND DECISIVE GRAPHS Simulation of Crash for a Scaled down Sedan car model was carried at different velocities using ANSYS Explicit Dynamics Approach. The initial distance between the wall and the front bumper of the car was 0.15m. Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1536 4.1 At 100m/s Chart-1: Energy vs. cycle graph at 100 m/s Fig-7: Directional deformation at 100 m/s Chart-2: Directional deformation graph of deformation vs. time at 100 m/s Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1537 Chart-3: Equivalent stress graph of Pressure vs. time at 100 m/s 4.2 At 250m/s Chart-4: Energy vs cycle graph at 250 m/s Fig-8: Directional deformation at 250 m/s Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1538 Chart-5: Directional deformation graph of deformation vs. time at 250 m/s 5. CONCLUSION In the present work crashworthiness of the scaled down sedan car model was tested using the computational approach using ANSYS Explicit Dynamics tool. It was seen that the extent of plastic deformation of the car increased with increase in velocity with front part of the car absorbing the major part of the impact energy, Bumper, bonnet, A pillar and wind shield were the major parts to undergo plastic deformation. Also from the energy graphs it was clear that internal energy increased drastically and the kinetic energy decreased during the course of impact. After the impact the car body rebounds back and regains its kinetic energy, while the internal energy decreases REFERENCES [1] T. Ambati, Srinath, P. Veeraraju “simulation of vehicular frontal crash test” iinternational journal of applied research in mechanical vol-2 (2012) [2] Byeong S.K, K. Park, Youn-Min Song “finite element frontal crash analysis of nev- vehicles platform with upper and sub frame body journal of dept. of automotive engineering hoseo university (2013) [3] Erika Fechova, Jozef Kmec, Alena Vagaska Drazan Kozak “material properties and safety of car at crash test”, journal of international conference on manufacturing engineering and materials, science direct (2016) [4] Saeed Barbat, Xiaowei Li, Priya Prasad “vehicle to vehicle front to side crash analysis using a CAE based methodology “journal of passive safety research and advanced engineering (2004) [5] Touraj Gholami, Jürgen Lescheticky, Ralf Pabmann “crashworthiness simulation of automobile with ABAQUS/Explicit”, journal of Abaqus user conference BMW Group (2003) [6] Wlodzimierz Bedkowski “assessment of the fatigue life of machine components under service load –A review of selected problems” journal of theoretical and applied mechanics, (2014) [7] Jadav Chetan, Panchal Khushbu, Moulvi Nauman “the fatigue analysis of a vehicle suspension system –A review article” international journal of advanced computer research (2012) [8] Hariharan Sankarasubramanian Sudipto Mukherjee,” optimization of vehicle front for safety of pedestrians” Indian institute of technology, Delhi, India, 2014. [9] C. Sadhasivam & S. Jayalakshmi,” simulation of car body by development of static and dynamic analysis” department of mechanical engineering, pet engineering college, Tirunelveli, Tamilnadu, India 2011. [10] Mandeep Kumar Vandanapu1, Ratnakar Pandu,” design optimization of passenger car front bumper” international journal of science and research (IJSR) 2015. Volume: 05 Issue: 08 | Aug 2018 www.irjet.net p-ISSN: 2395-0072
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