Ultrasonic measurement of residual stress in steels using critically refracted longitudinal waves (L) : Teodoro, L.-S. Dissertation Abstracts International, Vol. 50, No. 1, 110 pp. (Jul. 1989)

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• 作者：Teodoro ; L.-S.
• 刊名：NDT and E International
• 出版年：1995
• 出版时间：April, 1995
• 年：1995
• 卷：28
• 期：2
• 页码：118
• 全文大小：157 K

文摘

The problem of measuring residual stress in steel welded plates by applying the acoustoelasticity of the critically refracted longitudinal waves (L) waves) was approached. Two welded plates were investigated: one hot-rolled and one cold-rolled. It is known from other studies that longitudinal residual stress (i.e., stress parallel to the weld bead) has the largest residual stress gradient after welding, and the acoustoelastic behavior of L waves is largest when a uniaxial stress in applied parallel to its propagation direction. Thus, the L waves technique was used and found capable of measuring stress changes after welding and after stress relieving of the plates. Two differential probes of 1 MHz and 2.25MHz transducers were used and effectively measured longitudinal residual stress. The hole drilling technique (HDT), a semidestructive surface stress measurement technique, was used to verify the results from the ultrasonic technique. The (001)[110] texture also was investigated by using a neutron diffraction technique. The technique yields an average of the orientation distribution of the (110) planes since it is a through-the-thickness transmission technique.