ارائه پيكره‌بندي جديد پروفيل‌هاي كركره‌اي حاصل از منحني‌هاي دايره‌اي مماس بر يكديگر جهت افزايش قابليت جذب انرژي

Introducing a New Corrugated Profile Generated from Tangential Circular Curves to Increase Energy Absorption

ﺳﺎزه ﻫﺎي ﺟﺪار ﻧﺎزك ﺑﻪ ﻃﻮر ﮔﺴﺘﺮده ﺑﺮاي ﺟﺬب اﻧﺮژي در ﺗﺼﺎدﻓﺎت ﺟﺎده اي ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﻣﯽ ﮔﯿﺮﻧﺪ. در اﯾﻦ ﻣﻘﺎﻟﻪ، ﻃﺮح ﺟﺪﯾﺪي از ﭘﺮوﻓﯿﻞﻫﺎي ﮐﺮﮐﺮهاي ﻣﺒﺘﻨﯽ ﺑﺮ ﻣﻨﺤﻨﯽ ﺣﺎﺻﻞ از ﮐﻤﺎن ﻫﺎي داﯾﺮهاي ﻣﻤﺎس ﺑﺮ ﯾﮑﺪﯾﮕﺮ ﺑﺮاي اﻓﺰاﯾﺶ ﻗﺎﺑﻠﯿﺖ ﺟﺬب اﻧﺮژي ﺳﺎزهﻫﺎي ﺟﺪار ﻧﺎزك اراﺋﻪ ﺷﺪه اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ ﺑﺮاي ارزﯾﺎﺑﯽ ﻗﺎﺑﻠﯿﺖ ﺿﺮﺑﻪﭘﺬﯾﺮي از ﮐﺪ اﺟﺰاء ﻣﺤﺪود LS-Dyna اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ، ﺑﻪ ﻗﺼﺪ ﺻﺤ ﺳﻨﺠﯽ ﻣﺪلﺳﺎزي و روش ﺣﻞ، اﺑﺘﺪا ﻧﺘﺎﯾﺞ ﺑﺎ ﻧﺘﺎﯾﺞ ﺗﺠﺮﺑﯽ ﻣﻘﺎﯾﺴﻪ ﺷﺪه اﺳﺖ ﮐﻪ ﺣﺎﮐﯽ از آن اﺳﺖ، ﺷﺒﯿﻪﺳﺎزي ﺑﻪ ﺧﻮﺑﯽ ﻣﯽﺗﻮاﻧﺪ رﻓﺘﺎر ﺳﺎز را ﭘﯿﺶﺑﯿﻨﯽ ﻧﻤﺎﯾﺪ. اﯾﻦ ﭘﺮوﻓﯿﻞﻫﺎ ﺗﺤﺖ ﺑﺎر ﺷﺒﻪاﺳﺘﺎﺗﯿﮑﯽ و در ﺑﺎرﮔﺬاريﻫﺎي ﻣﺤﻮري، ﺟﺎﻧﺒﯽ و ﻣﺎﯾﻞ ﺑﺮرﺳﯽ ﺷﺪه و ﻧﺘﺎﯾﺞ ﺑﺎ ﻧﺘﺎﯾﺞ ﺣﺎﺻﻞ از ﭘﺮوﻓﯿﻞﻫﺎي ﻣﻌﻤﻮل ﻣﺮﺑﻌﯽ، داﯾﺮهاي و ﻣﺮﺑﻌﯽ ﭼﻨﺪ ﺳﻠﻮل ﻣﻘﺎﯾﺴﻪ ﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ، ﭘﺮوﻓﯿﻞﻫﺎي ﮐﺮﮐﺮه اي اراﺋﻪ ﺷﺪه ﻣﯽﺗﻮاﻧﻨﺪ ﭘﺎراﻣﺘﺮﻫﺎي ﺟﺬب اﻧﺮژي وﯾﮋه را ﺗﺎ 26% و راﻧﺪﻣﺎن ﻧﯿﺮوي ﺿﺮﺑﻪاي را ﺗﺎ 10% ﻧﺴﺒﺖ ﺑﻪ ﭘﺮوﻓﯿﻞ ﻫﺎي ﻣﻌﻤﻮل ﭼﻨﺪ ﺳﻠﻮل اﻓﺰاﯾﺶ دﻫﻨﺪ. از ﻃﺮﻓﯽ اﺳﺘﻔﺎده از ﺻﻔﺤﺎت ﻣﺘﻘﺎﻃﻊ داﺧﻞ ﭘﺮوﻓﯿﻞﻫﺎي ﮐﺮﮐﺮه اي از اﯾﺠﺎد ﻣﻮد ﺗﻐﯿﯿﺮ ﺷﮑﻞ ﮐﻠﯽ ﺟﻠﻮﮔﯿﺮي ﻣﯽﻧﻤﺎﯾﺪ. در ﺑﺎرﮔﺬاري ﺟﺎﻧﺒﯽ ﻣﻘﺪار ﺟﺬب اﻧﺮژي ﻣﻮﺛﺮ ﺣﺪودا 20% ﮐﻤﺘﺮ از ﭘﺮوﻓﯿﻞ ﭼﻨﺪ ﺳﻠﻮل ﻣﻌﻤﻮل اﺳﺖ، اﻣﺎ راﻧﺪﻣﺎن ﻧﯿﺮوي ﺿﺮﺑﻪاي ﺑﻪ ﻃﻮر ﻗﺎﺑﻞ ﻣﻼﺣﻈﻪاي ﺑﯿﺸﺘﺮ اﺳﺖ.

Thin-walled tubes are widely used to absorb energy in road accidents. In this paper, a novel circumferentially corrugated tubes with a tangential circular profile is studied. The LS-Dyna finite element code is used to evaluate the crashworthiness. In order to verify the models and the solution method, the results are compared with the experimental results. These studies show that the simulation correctly predicts the behavior of the structure. These profiles are investigated under quasi-static, axial, lateral and oblique loads. Then, the results are compared with the results of the conventional square, circular and cellular square tubes. The results indicate that the present profiles under simultaneous axial and lateral loads, compared with the conventional cellular square tubes, increase the specific energy absorption and the crush force efficiency parameter by 26% and 10%, respectively. In addition, the results show that use of cross blades inside the corrugated profiles prevents the creation of a general deformation mode. Under lateral loading, compared with the conventional cellular square tubes, the amount of specific energy absorption is about 20% less, but the crushing force efficiency is significantly higher.