Patent ID: 11946908
Assignee: BEIJING PRECISION MACHINERY & ENGINEERING RESEARCH CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The method for constructing the surface stress distribution cloud map based on critical refraction longitudinal wave detection according to claim 1, wherein before step S2, the method further comprises the following steps:
acquiring a zero stress specimen of the same material as the detected article;
arranging a transmitting probe and a receiving probe for critical refraction longitudinal wave detection on the surface of the zero stress specimen, and installing a wedge block of the transmitting probe and a wedge block of the receiving probe;
conducting a tensile test for the zero stress specimen to obtain an ultrasonic acoustic time-load relationship curve under different loads, and obtaining a stress-acoustic time difference coefficient corresponding to the zero stress specimen according to the ultrasonic acoustic time-load relationship curve, wherein the stress-acoustic time difference coefficient corresponding to the zero stress specimen is the stress-acoustic time difference coefficient corresponding to the detected article;
conducting the critical refraction longitudinal wave detection of the zero stress specimen again to obtain the critical refraction longitudinal wave propagation duration corresponding to the zero stress specimen under the zero stress state, wherein the critical refraction longitudinal wave propagation duration corresponding to the zero stress specimen is the critical refraction longitudinal wave propagation duration corresponding to the detected article under the zero stress state.