ﻣﺠﻠﻪ ﻣﻬﻨﺪﺳﯽ ﻣﮑﺎﻧﯿﮏ ﻣﺪرس، ﻓﻮق اﻟﻌﺎده اﺳﻔﻨﺪ1393 ، دوره14 ، ﺷﻤﺎره15 ، ص ص42 - 50 ﻣﺎﻫﻨﺎﻣﻪ ﻋﻠﻤﯽ ﭘﮋوﻫﺸﯽ ﻣﻬﻨﺪﺳﯽ ﻣﮑﺎﻧﯿﮏ ﻣﺪرس mme.modares.ac.ir ﺑﺮاي ارﺟﺎع ﺑﻪ اﯾﻦ ﻣﻘﺎﻟﻪ از ﻋﺒﺎرت ذﯾﻞ اﺳﺘﻔﺎده ﻧﻤﺎﯾﯿﺪ: Please cite this article using: M. Shariati, K. Kolasangiani, Kh. Farhangdoost, Experimental and numerical study on accumulation of plastic strain of SS316L cantilevered cylindrical shells under cyclic bending and combined (bending-torsion) loads, Modares Mechanical Engineering, Vol. 14, No. 15, pp. 42-50, 2015 (In Persian) واﮐﺎوي ﻋﺪدي و ﺗﺠﺮﺑﯽ اﻧﺒﺎﺷﺘﮕﯽ ﮐﺮﻧﺶ ﭘﻮﺳﺘﻪ ﻫﺎي اﺳﺘﻮ اﻧ ﻪ اي ﻓﻮﻻديSS316L ﯾﮏ ﺳﺮﮔﯿﺮدار ﺑﺎ ﺑﺎرﮔﺬاري ﺧﻤﺸﯽ و ﻣﺮﮐﺐﺧﻤﺸﯽ) - ﺗﻨﺎوﺑﯽ( ﭘﯿﭽﺸﯽ ﻣﺤﻤﻮد ﺷﺮﯾﻌﺘﯽ 1 * ، ﮐﻤﺎل ﮐﻼﺳﻨﮕﯿﺎﻧﯽ 2 ، ﺧﻠﯿﻞ ﻓﺮﻫﻨﮓ دوﺳﺖ 3 1 - اﺳﺘﺎد، ﻣﻬﻨﺪﺳﯽ ﻣﮑﺎﻧﯿﮏ، داﻧﺸﮕﺎه ﻓﺮدوﺳﯽ ﻣﺸﻬﺪ، ﻣﺸﻬﺪ 2 - داﻧﺸﺠﻮي دﮐﺘﺮا، ﻣﻬﻨﺪﺳﯽ ﻣﮑﺎﻧﯿﮏ، داﻧﺸﮕﺎه ﻓﺮدوﺳﯽ ﻣﺸﻬﺪ، ﻣﺸﻬﺪ 3 - داﻧﺸﯿﺎر، ﻣﻬﻨﺪﺳﯽ ﻣﮑﺎﻧﯿﮏ، داﻧﺸﮕﺎه ﻓﺮدوﺳﯽ ﻣﺸﻬﺪ، ﻣﺸﻬﺪ * ﻣﺸﻬﺪ، ﺻﻨﺪوق ﭘﺴﺘﯽ9177948944 ، mshariati44@um.ac.ir اﻃﻼﻋﺎت ﻣﻘﺎﻟﻪ ﭼﮑﯿﺪه ﻣﻘﺎﻟﻪ ﭘﮋوﻫﺸﯽ ﮐﺎﻣﻞ : درﯾﺎﻓﺖ31 ﻓﺮوردﯾﻦ1393 : ﭘﺬﯾﺮش01 ﺷﻬﺮﯾﻮر1393 : اراﺋﻪ در ﺳﺎﯾﺖ28 ﻣﻬﺮ1393 در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﺑﺮرﺳﯽ ﺗﺠﺮﺑﯽ و ﻋﺪدي اﻧﺒﺎﺷﺘﮕﯽ ﮐﺮﻧﺶ ﻣﻮم ﺳﺎن و رﻓﺘﺎر ﻧﺮم ﺷﻮﻧﺪﮔﯽ ﭘﻮﺳﺘﻪ ﻫﺎي اﺳﺘﻮ اﻧ ﻪ اي ﯾﮏ ﺳﺮﮔﯿﺮدار ﻓﻮﻻديSS316L ﺑﺎ ﺧﻤﺸﯽ) ﺑﺎرﮔﺬاري ﺧﻤﺸﯽ و ﻣﺮﮐﺐ- ﺑﻪ( ﭘﯿﭽﺸﯽ ﺻﻮرت ﺗﻨﺎوﺑﯽ ﭘﺮداﺧﺘﻪ ﺷﺪه ﺑﺎرﮔﺬاري. اﺳﺖ ﻫﺎي ﺧﻤﺸﯽ ﺑﻪ ﺻﻮرت ﻧﯿﺮو- ﮐﻨﺘﺮل و ﺟﺎﺑﻪ ﺟﺎﯾﯽ- ﮐﻨﺘﺮل اﺳﺖ؛ اﻣﺎ در ﺑﺎرﮔﺬاري ﻫﺎي ﻣﺮﮐﺐ، اﻋﻤﺎل ﻧﯿﺮو ﻓﻘﻂ ﺑﻪ ﺻﻮرت ﺟﺎﺑﻪ ﺟﺎﯾﯽ- آزﻣﺎﯾﺶ. ﮐﻨﺘﺮل اﺳﺖ ﻫﺎي ﺗﺠﺮﺑﯽ ﺗﻮﺳﻂ دﺳﺘﮕﺎه ﺳﺮو ﻫﯿﺪروﻟﯿﮏ اﯾﻨﺴﺘﺮون 8802 اﻧﺠﺎم ﺷﺪه اﺳﺖ ﮐﻪ ﺑﺎ ﺑﺎرﮔﺬاري ﻧﯿﺮو- ﮐﻨﺘﺮل ﺑﺎ ﻧﯿﺮوي ﻣﯿﺎﻧﮕﯿﻦ ﻏﯿﺮ ﺻﻔﺮ ﺗﻐﯿﯿﺮ ﺷﮑﻞ ﻣﻮم ﺳﺎن در ﭼﺮﺧﻪ ﻫﺎي ﭘﯿﺎﭘﯽ اﻧﺒﺎﺷﺘﻪ ﻣﯽ ﺷﻮد ﮐﻪ ﭘﺪﯾﺪه ﺑﺮ اﺳﺎس ﻧﺘﺎﯾﺞ ﺗﺠﺮﺑﯽ، راﺑﻄﻪ. رﭼﺘﯿﻨﮓ ﻧﺎم دارد ي ﺧﻄﯽ ﺑﯿﻦ اﻧﺮژي ﻣﻮم ﺳﺎن و ﻧﺮخ ﺗﻐﯿﯿﺮ ﺷﮑﻞ ﻣﻮم ﺳﺎن ﻣﺸﺎﻫﺪه ﺷﺪ ﮐﻪ ﺑﯿﺎﻧﮕﺮ ﺳﻔﺘﯽ ﻓﯿﮑﺴﭽﺮﻫﺎي ﻣﻮرد اﺳﺘﻔﺎده در آزﻣﺎﯾﺶ در ﺑﺎرﮔﺬاري ﺟﺎﺑﻪ. ﻫﺎي ﺗﺠﺮﺑﯽ اﺳﺖ ﺟﺎﯾﯽ- ﮐﻨﺘﺮل ر ﻓﺘﺎر ﻧﺮم ﺷﻮﻧﺪﮔﯽ ﺑﻪ دﻟﯿﻞ ﭘﺪﯾﺪه ﺑﯿﻀﯽ ﺷﺪن در ﭘﻮﺳﺘﻪ ﻫﺎ ﻣﺸﺎﻫﺪه ﻣﯽ ﺷﻮد و ﺑﺎ اﻓﺰاﯾﺶ داﻣﻨﻪ ﺟﺎﺑﻪ ﺟﺎﯾﯽ، ﺳﺮﻋﺖ ﻧﺮم ﺷﻮﻧﺪﮔﯽ اﻓﺰاﯾﺶ ﻣﯽ رﺷﺪ ﺗﺮك در ﺑﺎرﮔﺬاري ﻣﺮﮐﺐ ﺑﻪ. ﯾﺎﺑﺪ دﻟﯿﻞ وﺟﻮد ﻧﯿﺮوي ﭘﯿﭽﺸﯽ و ﺧﻤﺸﯽ ﺑﻪ ﺻﻮرت ﻣﺎﯾﻞ رﺷﺪ ﻣﯽ ﮐﻨﺪ؛ در ﺣﺎﻟﯽ ﮐﻪ در ﺑﺎرﮔﺬاري ﺧﻤﺸﯽ رﺷﺪ ﺗﺮك ﺑﻪ ﺻﻮرت ﻣﺤﯿﻄ ﺗﺤﻠﯿﻞ ﻋﺪدي ﺗﻮﺳﻂ ﻧﺮم اﻓﺰار آﺑﺎﮐﻮس اﻧﺠﺎم ﺷﺪه اﺳﺖ و ﺑﺎ. ﯽ اﺳﺖ ﻣﻘﺎﯾﺴﻪ ي اﻟﮕﻮي ﺳﺨﺖ ﺷﻮﻧﺪﮔﯽ ﻫﻤﮕﻦ و اﻟﮕﻮي ﺳﯿﻨﻤﺎﺗﯿﮏ ﻣﺸﺎﻫﺪه ﻣﯽ/ ﺳﺨﺖ ﺷﻮﻧﺪﮔﯽ ﻏﯿﺮ ﺧﻄﯽ ﻫﻤﮕﻦ ﺷﻮد ﮐﻪ اﻟﮕﻮي ﺳﺨﺖ ﺷﻮﻧﺪﮔﯽ ﻏﯿﺮ ﺧﻄﯽ ﺳﯿﻨﻤﺎﺗﯿﮏ، رﻓﺘﺎر ﻧﺮم ﺷﻮﻧﺪﮔﯽ و اﻧﺒﺎﺷﺘﮕﯽ ﮐﺮﻧﺶ ﻣﻮم/ ﻫﻤﮕﻦ ﺳﺎن ﭘﻮﺳﺘﻪ ﻫﺎي اﺳﺘﻮ اﻧ ﻪ اي ﺑﺎ ﺑ ﺎرﮔﺬاري ﺧﻤﺸﯽ ﺗﻨﺎوﺑﯽ را ﺑﻬﺘﺮ ﺷﺒﯿﻪ ﺳﺎزي ﻣﯽ ﮐﻨﺪ. ﮐﻠﯿﺪ واژﮔﺎن: ﭘﻮﺳﺘﻪ اﺳﺘﻮ اﻧ ﻪ اي ﺑﺎرﮔﺬاري ﺧﻤﺸﯽ ﺗﻨﺎوﺑﯽ ﺑﺎرﮔﺬاري ﻣﺮﮐﺐ ﺗﻨﺎوﺑﯽ اﻧﺒﺎﺷﺘﮕﯽ ﮐﺮﻧﺶ ﻣﻮم ﺳﺎن و ﻧﺮم ﺷﻮﻧﺪﮔﯽ اﻟﮕﻮي ﺳﺨﺖ ﺷﻮﻧﺪﮔﯽ Experimental and numerical study on accumulation of plastic strain of SS316L cantilevered cylindrical shells under cyclic bending and combined (bending-torsion) loads Mahmoud Shariati 1* , Kamal Kolasangiani 2 , Khalil Farhangdoost 3 1- Department of Mechanical Engineering, Ferdowsi University, Mashhad, Iran. 2- Department of Mechanical Engineering, Ferdowsi University, Mashhad, Iran. 3- Department of Mechanical Engineering, Ferdowsi University, Mashhad, Iran. * P.O.B. 9177948944 Mashhad, Iran, mshariati44@um.ac.ir ARTICLE INFORMATION ABSTRACT Original Research Paper Received 20 April 2014 Accepted 23 August 2014 Available Online 20 October 2014 In this research, accumulation of plastic strain and softening behavior of stainless steel SS316L cylindrical shell under cyclic bending and combined loads (bending-torsion) is studied. Cyclic bending was under force-control and displacement-control but Combined loading was under displacement-control. Experimental tests were performed using an INSTRON 8802 servo- hydraulic machine. Under force-control loading with non-zero mean force, plastic strain was accumulated in continuous cycles called ratcheting. Based on experimental results, linear relation was observed between plastic energy and rate of plastic deformation, which shows the rigidity of fixtures used in experimental tests. Under displacement-control loading, softening behavior was observed due to growth of ovalization and the rate of softening increased by use of the higher displacement amplitude. The crack growth up to failure is oblique in combined load due to torsion and bending loads whereas the crack growth is peripheral in bending load. The numerical analysis was carried out by ABAQUS software and nonlinear isotropic/kinematic hardening was compared with isotropic hardening; it was observed that the nonlinear isotropic/kinematic hardening model simulates the softening behavior and accumulation of plastic strain of cylindrical shells under cyclic bending accurately. Keywords: Cylindrical Shell Cyclic Bending Load Cyclic Combined Load Accumulation of plastic strain and Softening Hardening Model 1 - ﭘﯿﺸﮕﻔﺘﺎر اﻣﺮوزه ﭘﻮﺳﺘﻪ ﻫﺎ ﺑﺨﺶ اﻋﻈﻤﯽ از ﺳﺎزه ﻫﺎي ﺻﻨﺎﯾﻊ ﻣﺨﺘﻠﻒ را ﺑﻪ ﺧﻮد اﺧﺘﺼﺎص داده ﭘﻮﺳﺘﻪ. اﻧﺪ ﻫﺎ ﺑﻪ دﻟﯿﻞ وزن ﮐﻢ و ﻣﻘﺎوﻣﺖ زﯾﺎد، ﮐﺎرﺑﺮد ﮔﺴﺘﺮده اي در ﺻﻨﺎﯾﻊ ﺳﺎزه. اﯾﻦ ﺧﻮاص ﻧﺎﺷﯽ از ﻃﺒﯿﻌﺖ ﻫﻨﺪﺳﯽ و ﻣﺎدي ﭘﻮﺳﺘﻪ اﺳﺖ. دارﻧﺪ ﻫﺎي ﭘﻮﺳﺘﻪ اي از ﻧﻈﺮ ﺗﺤﻤﻞ ﺑﺎرﻫﺎي ﻓﺸﺎري و ﺿﺮﺑﻪ اي از ﺑﻬﺘﺮﯾﻦ ﺳﺎزه ﻫﺎ ﺑﻪ ﺷﻤﺎر ﻣﯽ روﻧﺪ و ﺑﻪ ﻫﻤﯿﻦ دﻟﯿﻞ در ﻃﺒﯿﻌﺖ ﻧﯿﺰ ﭘﻮﺷﺶ اﻧﺪام ﮔﯿﺎﻫﺎن و ﺟﺎﻧﻮران Downloaded from mme.modares.ac.ir at 15:01 IRST on Sunday November 28th 2021