Method for measuring stress on steel by determining the reverse

Details Method for measuring stress on steel by determining the reverse Method for measuring stress on steel by determining the reverse

1990-03-09

1991-04-23

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Stress in material measurement

G01B 724, G01R 3318

Patent

active

050102990

ABSTRACT:
A rapid and reliable non-destructive method is proposed for the determination of stress in a steel material by determining the reversible magnetic permeability .mu. under a magnetic bias field H.sub.0 in the range of approach to the saturation magnetization, calculating the factor M in the equation .mu.=1+M/H.sub.0.sup.3 by using the value of .mu., and calculating .sigma..sub.1, .sigma..sub.2 and .theta. by solving the equation ##EQU1## in which .sigma..sub.1 is a principal stress, .sigma..sub.2 is the principal stress perpendicular to .sigma..sub.1, .theta. is the angle between .sigma..sub.1 and the direction of measurement of .mu., a is the value of .sqroot.M in a stress-free state and b is the stress sensitivity, a and b being determined separately.

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