Khảo sát biến dạng của nòng sings khi bắn bằng phương pháp phần tử hữu hạn

NGHIEN CLfU - TRAO D C I N/KHAO S A T BliN DANG C O A NONG SUNG KHI BAN B A N G PHl/aNG PHAP PHAN TU' HU'U HAN THE SURVEY OF DEFORMATION OF A BARREL WHEN FIRING BY THE FINITE ELEMENT METHOD D Tat Thanh Hpc viln Ky thuat Q u i n sU TOIVI TAT Bii bao trinh bdy qui trinh mo phdng biln dang cua ndng sung AKM bin chiu tdi cua dp sudt thuoc vi nhiet Bang phUdng phip phdn tU httu han, cung vdi cdng cu md phdng tren phdn mem ANSYS, viec tinh todn Ung biln dang di dUdc gidi quylt vi khic phuc nhilu nhugc diem mi mgt so phUdng phip khic mac phdi Kit qud thu dugc la tin cay vd triic quan, cd the dung tinh todn cho mgt so vdn dl ki thudt tUdng tU Tii khda: Bien dang ndng md phdng This article presents a simulation process of the and deformation field of the barrel of a AKM rifle when firing under the load of the gas pressure and temperature The calculation of the deformation of a barrel were resolved and many disadvantages of other methods were overcome because of the finite element method and the simulation toob of the ANSYS software The result of this method isreliahleandvisud and it can be used tocalculatesomesimilartechnical issues Keywords: Deformations, barrel, simulation, AKM ISSN 0866 - 7056 TAP CHl CO KHl VIET NAM, Sd nam 2016 www.cokhivietnam.vn NGHIEN CLfU - TRAO D I DAT VAN DE Khio sit bien dang tren t h i n h ndng sflng phio li van dl dfloc nhieu ngUdi quan tim, giai quyet v i bang nhieu phUflng phap khac nhau, mpt cac phuong phip dp la md phdng bing phuong phip phin tfl hflu ban (PTHH) Vdi phuong phip PTHH va cdng cu li phan mem ANSYS, cd t h i khip sat bien dang cfla ndng sung phio mdt hay nhilu phit ban Bai bio n i y chi trinh biy van d l bien dang dudi tic dung cua mdt phat b i n vdi ddi tUpng k h i o sit la sung AKM dp Viet Nam sin xuat Coi ndng sflng ddi xflng h o i n toan qua true ndng, bai toan cd t h i dUdc xem xet nhU mpt, bii toin hai chilu mat phang cat nga**« true ndng NhU viy, xiy dflng md hinh htoh Ansys cd k l d i n ranh xoan se l i cO sfl i nhflng budc p h i n tich tilp theo Chia q u i trinh tmh tpan ba bai t J rieng biet: Khi chiu tai i p suit, chiu tai nhiel:| v i chiu tai ddng thdi ap suit v i nhilt dp Thdng si dau vio d l tmh dupc lay theo tii Ueu [8] 2.2 Bien dang (chuyin vl) tren nong sung AKM ban NOI DUNG NGHIEN CCU * Bien dang xung dp sudt: Theo phuang phip PTHH, d l khao sit nhflng miln lien tuc, ngUdi ta cd the chia nhflng miln lien tuc niy nhflng mien rdi rac Cd nhilu cich de rdi rac boa nhflng mien liln tuc bang cich sfl dung ludi tUOng tU, hoac nhflng miln cd hinh tam giic cho cich giii thfl hai cfla phuong trinh vi phin tflng phan elliptic, xuit hien tfl cac bii toan vl xoan cua hinh tru, tiln hanh dit tii v i tinh toin theo trinh tU se cd the thu dupc md phdng trudng flng suit va bien dang mong mudn Vdi each lim nay, nghiin cflu bien dang cua ndng sung AKM ban dupc tiln hinh 2.1.Md hinh hinh hpc cixa ndng siing AKM Ndng sflng tilu lien AKM Viet Nam sin xuat dupc cpi l i vat ddi xflng qua true hay cdn goi li vit trdn xoay chiu tai trpng ddi xflng true cd kich thUdc nhu hinh Kit qua md phdng bien dang cfla thinh ndng sung AKM tai ip suat ban trln ANSYS 15 the hiln trln hinh ve sau: Hinh Bien dang theo hudng kinh vd tilp tuyin dp sudt* Biln dang nhiit: Kit q u i md phdng biln dang (chuyin vi) cfla ndng sflng AKM nhiet b i n tren ANSYS 15 t h i hien tren hinh 3: Hinh Hinh dang hinngodi cua ndng sung AKM Tfl day, xiy dung md hinh 3D, cung vdi cic cdng bd khoa hpc vl ndng sflng cac tii lieu [2], [3] chia ludi phan mem Ansys, tham khio cic tii heu [ ], [4] thu dupe ket qui ludi Hinh Biln dang xung nhiit theo hudng kinh vd tiep tuyen ISSN 0866-7056 TAP CHl CO KHl VlfiT NAM, Sd nam 2016 www.cokhivietnam.vn NGHIEN CO'U-TRAO D | Bien dang tac ddng ddng thdi cua tai > suat va nhiet the hien tren hinh 4: ^ ^ Hinh Chuyen vi tdng hdp dp sudt vd nhiit Qua trinh giai bai toan diidc thifc hien vdi tdng loai tai khac nhau: Tai ap suat, tai nhiet dp va tai ap suat - nhiet dp ddng thdi, ket qua dildc dUa dildi dang anh Cac ket qua se dung lam cd sd de kiem nghiem va danh gia ben ndng sung tieu lien AKM So sanh gia tri dng suat ldn nhat vdi gia tri dng suat cho phep vdi loai thep che tao ndng ta thay ndng sung du ben ''c=100,32Mpa