مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی جذب انرژی در تیر های ساندویچی با هسته ی مشبک پر شده از فوم، تحت بارگذاری خمشی شبه استاتیک

نویسندگان
1 دانشجوی دکترا
2 دانشیار دانشکده مکانیک دانشگاه سمنان
چکیده
در این پژوهش تاثیر روش پرکردن هسته های مشبک تیر های ساندویچی، با فوم های پلی یورتان از نوع سخت با وزن سبک، مورد مطالعه قرار گرفته است. ارتباط بین نیرو و جابه جایی در مرکز تیر با استفاده از نتایج آزمایشگاهی بدست آمده است. سه نوع هسته مشبک از جنس فولاد به صورت خالی و پر شده از فوم، تحت بارگذاری شبه استاتیکی به صورت عرضی، مورد مطالعه و بررسی قرار گرفته است. در ادامه با مطالعه بر روی جهت گیری صفحات مشبک در هسته، به بررسی پارامترهای ضربه پذیری، از جمله جذب انرژی ویژه، بعنوان اهداف آزمایش پرداخته شده است. این نوع سیستم جاذب انرژی، می تواند در صنایع هوایی، کشتی سازی، خودروسازی، صنایع ریلی و آسانسورها جهت جذب انرژی ضربه مورد استفاده قرار گیرد. نتایج تحلیل آزمایشگاهی خمشی نشان داد، که به کارگیری فوم در هسته، می تواند ظرفیت جذب انرژی را به صورت قابل ملاحضه ای افزایش دهد. نتایج آزمایش های خمشی نشان داد که ظرفیت جذب انرژی ویژه در تیر ساندویچی تقویت شده با فوم در مقایسه با نمونه مشابه توخالی، 74٪ افزایش یافته است. همچنین، جهت گیری مناسب هسته مشبک در تیر ساندویچی موجب افزایش جذب انرژی ویژه تا 66.5٪ می شود. در انتها پارامترهای هندسی مناسب، و بهترین نمونه-ها از لحاظ معیارهای در نظر گرفته شده با توجه به اهداف طراحی، معرفی می شوند.
کلیدواژه‌ها

عنوان مقاله English

Experimental Investigation of Energy Absorption in Foam Filled Sandwich Beams with Expanded Metal Sheet as Core under Quasi-static Bending

نویسندگان English

hossein taghipoor 1
mohammad damghani noori 2
1 Ph.D candidate in mechanical engineering
2 Associated of Mechanical Engineering of Semnan University
چکیده English

In this research, influence of foam filling technique in sandwich beams with expanded metal sheet as core by using lightweight rigid polyurethane foam is investigation. Relationships between the force and displacement at the midspan of the sandwich beams are obtained from the experiments. Three types of Steel lattice cores both bare and foam-filled were subjected to quasi-static. The performance of sandwich structures with expanded metal sheets as core were studied under transverse bending. In the following, by studying the orientation of the core layers to evaluation the impact parameters, including Specific Energy Absorption (SEA) as discussed testing purposes. the energy absorbing system can be used in the aerospace industry, shipbuilding, automotive, railway industry and elevators to absorb impact energy. experimental results showed that foam filling technique can significantly increase specific absorbed energy. Results of three point bending crushing tests showed that the SEA of foam-filled sandwich beam increased by 74 %, comparing to the hollow beam. Also, appropriate orientation of core in the sandwich beam caused to increase the specific energy absorption by 66.5%. Finally, appropriate geometric parameters and the best examples of criteria considered with respect to the objectives, are introduced.

کلیدواژه‌ها English

energy absorption
expanded metal sheet
sandwich beam
rigid polyurethane foam
transverse bending
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