NGHIEN CIJTU-TRAO Ddl KHAO SAT HAM HAP THU TRONG TINH TOAN UNG SUAT VAT LIEU PHI DANG HU'OfNG B A N G NHlfiU XA X - QUANG SU* DUNG PHU'OnVG PHAP DO OMEGA STUDY OF ABSORPTION FACTOR IN X-RAY STRESS ANALYSIS OF ANISOTROPY MATERIAL USING Q-TYPE GONIOMETER TS Le Chi Cmrag Khoa Co mdy, Trudng Dgi hpc Su phgm KytiiuatThanh phd Hd Chi Minh TOM TAT Bdi bdo nghien ciru tinh todn hdm hdp thu ung sudt diing nhieu xg X-quang doi v& vgt lieu phi dang hu&ng Kit qud mo phong thepferrite v&i ho mat phang nhieu xg {211} diing d tinh tia X la Cr-Ka cho thdy mo hlnh Eshelby-Kroner cho gid tri gdn vai thuc nghiem han so v&i hinh Voigt vd Reuss Tir khda: Do ung sudt bdng X-quang; He so hdp thu; Tex-tua; Vgt lieu phi dang hu&ng ABSTRACT This research will represent the influence of the anisotropy of material into the generaliz absorption function in stress measurement using x-ray diffraction The simulation result offerrit steel {211} plane using Cr-Ka radiation shows that the Eshelby-Kroner give the closer result to experimental data in comparision to those from the Voigt and Reuss models Keywords: X-ray Stress Measurement; Absorption Factor; Texture; Anisotropic materials Gidl THI$U U'ng suit du Id mpt nhung nhan td quan trpng dnh hudng din dp bin, tudi thp cfla chi tidt may iTng suit du dugc phat sflih qua trinh gia cdng co, gia cdng dp luc, xu ly nhidt Vi vdy vipc xac djnh flng suit du cd vai trd rit quan trpng qua trinh xu ly va cdi thien diiu ki^n lam vipc ciia cac chi tidt mdy Cd nhieu phuang phdp xac dinh flng suat du tren be mdt chi tiit nhu phuang phap; Due Id, cdt tiet di$n, sidu dm, quang ddn hdi, nhieu xa neutron, nhidu xa X-quang Trong dd, phuang phap nhidu xa X-quang la phuang phdp khdng phd hfly cd the xac dinh chinh xdc ung suat, de dang tu dpng hda Dd tinh toan chinh xdc gid tri flng suit, cucrag tia X phai dugc hieu chinh bang he sd hap thu hoac ham hap thu [1,2] Ddi vdi vat lieu ding hudng, ham da dugc tinh toan[3] Tuy nhidn, ddi vdi vat lieu phi dang hudng nhu thep can ed td chflc texture, hdm hap thu vdn chua dupe tinh toan, dd, bdi nghidn cuu ndy se tinh ham hap thu tdng qudt cho vdt lipu phi ding hudng su dung cac gia thiet Voigt, Reuss va Elsherby-Kroner dflng phuang phdp Q ^ TAP CHf CO KHf VIET NAM • Sd 10 (Thdng lOnam 2012) Q NGHIEN CUTU-TRAO Ddl M I Q U A N WE UlSG SUAT - BIEN D ^ ^ G v6i/Cg; li him phan bo hudng (ODF); S,^ ket hpp don tinh the phi dang hudng; A la gdc quay quanh Xit he toa nhu Hinh 1, S 14 he vecta vuong gdc vdi hp mat nhieu xa {hkl} tpa dp gan hen voi mau, 5^, S^ nam Trpng bii nghien eilu nay, ta gia djnh b^ mat mlu L^ \k he toa do, vuong goe voi hg mat phang nguyen tii {hkl} L^ nam mat vat lifu phi dang hUdng la dong nhat, co t6 phang man t?o voi S^ mpt goe (p BiSn dang xac chiic tex-tua manh, tiic li phin be cua tinh the dinh duac la biln dang h6 tpa dp do, duac ly tudng hda chi vii hildng Uu tien Khi dd h? bieu dien thdng qua biSn dang ciia he tpa dp mau s6 ling suat dilpe tinh qua trung binh ciia h | so bang he thong ma tran chuyen doi tpa dp dan hpi dan tinh thi phi dang hudng, tiic li h| s6 din hoi dan tinh the trpng h^ trilc tpa d$ L HI SP ling suat dUpe xac dinh li: F(M;,!„ (1) Trong do: d^ la khoang each giCa cac mat m ^ g chua co iJng suat; a^j , j^, la cosin chi hudng cia L^, S, va Lj, S,; a^ li ma trjn chuyen giiSa he thong miu S va he thong L Thay a^,, a^ vio phiiang trinh (1) ta co biSn d^ng: Xet ehiun tia tdi phan to ed the tieh Sdz va nhieu x^ khdi mau thii Ddi vdi vat H|u phi d4ng hiidng, chieu dii xuyen than cua chum tia tdi vi tia nhilu xa can phii hieu chinh bang hi s6 ling suat TrUdng hpp niy, cUdng nhieu xa eua phan to la: ^eJ3J =£„cos psin TAP CHl CO KHl VI$T NAiM (3) Co djnh I/O C6 dinh;; Hinh Phuong phdp Q So 10 (Thing 10 nam 2012) NGHIEN cufu - TRAO BOI