NONLINEAR MODEL OF FLAW DETECTION IN STEEL PIPES BY MAGNETIC-FLUX LEAKAGE

被引：85

作者：

ALTSCHULER, E ^{[1
]}

PIGNOTTI, A ^{[1
]}

机构：

[1] FUDETEC, CTR IND RES, RA-1001 BUENOS AIRES, DF, ARGENTINA

来源：

NDT & E INTERNATIONAL | 1995年 / 28卷 / 01期

关键词：

STEEL PIPES; MAGNETIC FLUX LEAKAGE; NUMERICAL MODEL;

D O I：

10.1016/0963-8695(94)00003-3

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

A numerical model of crack detection by magnetic flux leakage that takes into account the saturation of the induction flux density with the applied field is developed. The model contains no free parameters and is validated with detailed measurements of material properties and magnetic fields reported by Forster. it is then used to discuss the dependence of signals on the tube wall thickness, crack depth and width, and the strength of the applied field. An estimate of the noise level is used to analyse the signal-to-noise ratio and calculate the optimal applied field for crack detection. Difficulties arising in internal crack detection of shallow cracks in thick-walled pipes are also discussed.

引用

页码：35 / 40

页数：6

共 10 条

[1]

FINITE-ELEMENT CALCULATIONS ON THE EFFECTS OF PERMEABILITY VARIATION ON MAGNETIC-FLUX LEAKAGE SIGNALS [J].

ATHERTON, DL ;

CZURA, W .

NDT INTERNATIONAL, 1987, 20 (04) :239-241

[2]

FINITE-ELEMENT CALCULATION OF MAGNETIC-FLUX LEAKAGE DETECTOR SIGNALS [J].

ATHERTON, DL ;

DALY, MG .

NDT INTERNATIONAL, 1987, 20 (04) :235-238

[3]

ATHERTON DL, 1988, BRIT J NONDESTR TEST, V30, P159

[4]

MAGNETIC LEAKAGE FIELDS CALCULATED BY THE METHOD OF FINITE-DIFFERENCES [J].

BRUDAR, B .

NDT INTERNATIONAL, 1985, 18 (06) :353-357

[5]

FORSTER F, 1985, MATER EVAL, V43, P1154

[6]

NEW FINDINGS IN THE FIELD OF NONDESTRUCTIVE MAGNETIC LEAKAGE FIELD INSPECTION [J].

FORSTER, F .

NDT INTERNATIONAL, 1986, 19 (01) :3-14

[7]

FORSTER F, 1985, MATER EVAL, V43, P1398

[8]

Forster F., 1982, DEFEKTOSKOPIYA, V11, P3

[9]

Lord W., 1977, British Journal of Non-Destructive Testing, V19, P14

[10]

PIGNOTTI A, 1992, 13TH P WORLD C NOND, P456

← 1 →