بررسی عددی اثر جنس و ضخامت پوسته در مکانیک برخورد کلاه ‌ایمنی موتورسیکلت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی / دانشگاه حکیم‌سبزواری، سبزوار

2 دانشگاه حکیم سبزواری-دانشکده فنی و مهندسی- گروه مهندسی مکانیک

چکیده

در تصادفات موتورسیکلت، شتاب وارد بر سر ناشی از برخورد، خطر بسیار زیادی برای سلامتی موتورسوار و سرنشینان دارد. در این پژوهش با استفاده از مدل اجزاء محدود به تحلیل دینامیکی برخورد مجموعه کلاه ‌ایمنی شامل سر، پوسته، فوم، بالشتک و بند پارچه‌ای برای بررسی اثر ضخامت و جنس پوسته بر معیار آسیب سر (اچ‌آی‌سی) پرداخته شده است. کلاه ‌ایمنی از نوع جلوباز با در نظرگرفتن سه جنس رایج انتخاب شد. در بیشتر تصادفات در لحظه برخورد سر با زمین، نحوه قرارگیری سر به‌صورت مایل می‌باشد. در مدل شبیه‌سازی شده این مقاله، در برخورد نیز سر به‌صورت مایل قرار گرفته است. نتایج به‌دست ‌آمده از این تحقیق با نتایج آزمایشات تجربی و مقالات معتبر تایید شده‌اند. نتایج شبیه‌سازی نشان می‌دهد که ضخامت بهینه‌ای برای کلاه ‌ایمنی صرف‌نظر از جنس آن وجود دارد. برای تعیین ضخامت بهینه باید مصالحه‌ای بین پارامترهای مختلفی چون معیار آسیب سر، شکست پوسته، وزن و قیمت انجام شود. طبق نتایج به‌دست آمده، در صورتی‌که ضخامت افزایش یابد، وزن کلاه و دامنه تغییرات شتاب وارد بر سر افزایش یافته و همچنین احتمال شکست پوسته کاهش می‌یابد. در صورتی‌که با کاهش ضخامت، علی‌رغم کاهش شتاب وارد بر سر، تنش ایجاد شده در پوسته افزایش یافته و منجر به شکست آن می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Investigation of the Effect of Shell Material and Thickness on the Mechanics of Motorcycle Helmets Impact

نویسندگان [English]

  • Mojtaba Ghasemzadeh Moghadam 1
  • Seyed Ali Hashemian 2
1 BSc Student / Hakim Sabzevari University
2 دانشگاه حکیم سبزواری-دانشکده فنی و مهندسی- گروه مهندسی مکانیک
چکیده [English]

In motorcycle accidents, the acceleration caused by the collision has a huge risk to the health of the motorcyclists and passengers. In this study, the finite element method was used for dynamic analysis of impact mechanics to predict the effect of the shell material and thickness on the head injury criteria of the helmeted head (including head, shell, foam, comfortable foam and strap). The open-face helmet, including three current market materials, were selected. Head orientation, in most accidents, at the collision moment is oblique. In the simulated impact model, the head is also placed obliquely. The results of this study are validated by the experimental results and valid published data. The simulation results show that there is an optimum thickness for the helmet shell regardless of its material. In order to determine the optimum thickness, there must be compromises between the various parameters such as head injury criteria, shell failure, weight, and price. According to the results obtained for the shell thickness, if the thickness increases, the weight and range of acceleration increase while the probability of shell failure decreases. If the thickness decreases, despite decreasing the acceleration in the head, the stress in the shell increases that leads to failure.
 

کلیدواژه‌ها [English]

  • Motorcycle helmet
  • Finite element method
  • Oblique impact
  • Head injury criteria
  • Impact test
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