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Document Type |
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Article In Conference |
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Document Title |
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USING GLASS MAT THERMOPLASTIC AS AUTOMOTIVE BUMPER استخدام الالياف الزجاجيه المعالجه حراريا كممتص للصدمات للطرف الامامي للسياره. |
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Subject |
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Automotive Crash Simulation |
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Document Language |
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English |
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Abstract |
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Pedestrian’s safety is a common concern of all automotive manufacture as well as the public at large. The reason is that, automotive accidents are claiming ever growing numbers of both fatalities and disabilities [1]. To address the safety of the pedestrian, especially in low-speed accidents by achieving a successful bumper design, we need to focus on the main two functions of the bumper. These are to assure pedestrian safety and to minimize intrusion during crash. It is also desired for the bumper to be of light weight to save in the overall weight of the car. This weight saving reduces the fuel consumption of the vehicle.
The usage of softer systems in automotive bumper is a growing trend currently especially to serve the pedestrians safety function. The term softer here does refer to the bumper system’s dynamic behavior rather than its material’s flexure or tension modules. However, the usage of such softer systems would raise issues of structural integrity of the bumper during crash.
There is a strong drive currently to adopt materials such as glass mat thermoplastic (GMT), high-strength sheet molding compound (SMC) for the bumper material and plastic polypropylene (PEP) for the bumper holders [2, 3, and 4] in this regard. These materials are of light weight and are thermoplastic resin based. While both the GMT and SMC do fulfill the pedestrian safety condition, and also contribute to enhance the automotive fuel consumption, they both show plastic deformation at crash, even in low-speed scenarios [3, and 4]. The PEP holders react only as shock absorbers and act like mechanical fuses when they are destroyed in car crash, preventing the main bumper from being damaged [5].
In this paper, we propose a remedy for this problem by modifying the Kelvin-Voigt system that the GMT and SMC materials are usually fitted at. We propose coating the bumper beam with a Rubber padding layer that eliminates the plastic strain at low-speed crash. We also examine the behavior of the PEP during such crash scenarios. We present here the results of a low-speed head-on automotive-pedestrian crash simulation scenario for these material models, using the explicit dynamics finite element code LS-DYNA within ANSYS integration setting.
A simplified parameterized finite element model of the car’s bumper form is used in several crash simulations that are carried out to test the validity of this modified bumper system. Based on the results of these tests, we show that, applying the Rubber coating material for the GMT and SMC bumper beams eliminates the plastic stains at low-speed crash. |
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Conference Name |
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International Conference on Frontiers of Mechanical Engineering,Materials and Energy |
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Duration |
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From : December 20 AD - To : December 21 AD |
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Publishing Year |
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1433 AH
2012 AD |
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Number Of Pages |
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10 |
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Article Type |
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Article |
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Conference Place |
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Beijing, China |
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Organizing Body |
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ICFMEME |
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Added Date |
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Tuesday, April 8, 2014 |
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Researchers
| د./ أحمد زكريا سالم | Salem, Dr. Ahmed Zakaria | Investigator | Doctorate | azsalem@Hotmail.com |
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Files
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36968.pdf
| pdf | Paper PDF File |
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