Khảo sát hàm hấp thu trong tính toán ứng suất vật liệu phi đẳng hướng bằng chiếu xạ x quang sử dụng

NGHIEN CIJTU-TRAO Ddl

KHAO SAT HAM HAP THU TRONG TINH TOAN UNG SUAT VAT LIEU

PHI DANG HU'OfNG BAN 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 khi mdy, Trudng Dgi hpc Su phgm Ky tiiuat Thanh phd Hd Chi Minh.

TOM TAT

Bdi bdo nghien ciru tinh todn hdm hdp thu trong do ung sudt diing nhieu xg X-quang doi v&i

vgt lieu phi dang hu&ng. Kit qud mo phong thepferrite v&i ho mat phang nhieu xg {211} diing dgc

tinh tia X la Cr-Ka cho thdy mo hlnh Eshelby-Kroner cho gid tri gdn vai thuc nghiem han so v&i mo

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 generalized

absorption function in stress measurement using x-ray diffraction. The simulation result offerritic

steel {211} plane using Cr-Ka radiation shows that the Eshelby-Kroner give the closer result to the

experimental data in comparision to those from the Voigt and Reuss models.

Keywords: X-ray Stress Measurement; Absorption Factor; Texture; Anisotropic materials.

1. Gidl THI$U neutron, nhidu xa X-quang.. .Trong dd, phuang

phap nhidu xa X-quang la phuang phdp khdng

U'ng suit du Id mpt trong nhung nhan td phd hfly cd the xac dinh chinh xdc ung suat, de

quan trpng dnh hudng din dp bin, tudi thp cfla chi dang tu dpng hda. Dd tinh toan chinh xdc gid tri

tidt may. iTng suit du dugc phat sflih trong qua flng suit, cucrag do tia X phai dugc hieu chinh

trinh gia cdng co, gia cdng dp luc, xu ly nhidt... bang he sd hap thu hoac ham hap thu [1,2]. Ddi

Vi vdy vipc xac djnh flng suit du cd vai trd rit vdi vat lieu ding hudng, ham nay da dugc tinh

quan trpng trong qua trinh xu ly va cdi thien diiu toan[3]. Tuy nhidn, ddi vdi vat lieu phi dang hudng

ki^n lam vipc ciia cac chi tidt mdy. nhu thep can ed td chflc texture,... hdm hap thu

vdn chua dupe tinh toan, do dd, bdi nghidn cuu

Cd nhieu phuang phdp xac dinh flng suat ndy se tinh ham hap thu tdng qudt cho vdt lipu phi

du tren be mdt chi tiit nhu phuang phap; Due Id, ding hudng su dung cac gia thiet Voigt, Reuss va

cdt tiet di$n, sidu dm, quang ddn hdi, nhieu xa Elsherby-Kroner dflng phuang phdp do Q. ^

TAP CHf CO KHf VIET NAM • Sd 10 (Thdng lOnam 2012) Q