Method for detecting deformation of metal bonding interface by second-order stress mutation angle

Abstract

The invention discloses a method for detecting deformation of a metal bonding interface by a second-order stress mutation angle. The method comprises the following steps of determining a critical angle Theta<w> of stress mutation of the metal bonding interface according to a metal relevant parameter; obliquely irradiating an ultrasonic longitudinal wave to detected metal by an excitation source, and constantly changing an incident angle Theta; receiving a secondary harmonic signal at the same side of the excitation source, and processing and recording second-order stress Sigma of the metalbonding interface changing with the incident angle Theta; drawing a curve of the second-order stress Sigma changing with the incident angle Theta, and determining a mutation angle Theta<ip> of stress during actual detection; and performing calculation to obtain a deformation angle Theta=Theta<w>-Theta<ip> between the metal bonding interface and a metal surface. The mutation angle of theoretical second-order stress is obtained according to the metal relevant parameter, the mutation angle of actual stress is obtained by constantly changing the ultrasonic incident angle and detecting the second-order stress, the angle difference between the theoretical second-order stress and the actual stress is the deformation angle between the metal bonding interface and the metal surface, and the slight deformation can be more sensitively detected according to the mutation angle of the second-order stress.

Description

technical field [0001] The invention discloses a method for detecting deformation of a metal bonding interface, in particular to a method for detecting deformation of a metal bonding interface by using a second-order stress mutation angle, which belongs to the scope of ultrasonic nonlinear detection. Background technique [0002] In large-scale industries such as machinery manufacturing, aerospace, and automobile manufacturing, ordinary industrial materials are gradually replaced by special materials that are resistant to high pressure, corrosion, and temperature. Structural materials, in order to ensure the performance of the device and the accuracy of the test results, ultrasonic nondestructive testing came into being. [0003] Traditional ultrasonic non-destructive testing has low frequency and long wavelength, and its sensitivity is not high in the detection of tiny defects. When ultrasonic waves propagate in media, harmonic signals will be generated as the propagation ...

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Problems solved by technology

[0003] The frequency of traditional ultrasonic non-destructive testing is low, the wavelength is long, and the sensitivity is not high in the detection of tiny defects

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