US 11,946,908 B2
Method for constructing surface stress distribution cloud map based on critical refraction longitudinal wave detection
Yuhong Dai, Beijing (CN); Nana Niu, Beijing (CN); Zuguang Huang, Beijing (CN); Junyan Xing, Beijing (CN); Xiaofeng Zhu, Beijing (CN); Huiling Ren, Beijing (CN); Heqiang Liu, Beijing (CN); Dequan Wang, Beijing (CN); Yaru Hou, Beijing (CN); and Xiaoqin Hao, Beijing (CN)
Assigned to Beijing Precision Machinery & Engineering Research Co., Ltd., Beijing (CN); and Beijing University Of Technology, Beijing (CN)
Filed by Beijing Precision Machinery & Engineering Research Co., Ltd., Beijing (CN); and Beijing University Of Technology, Beijing (CN)
Filed on Sep. 24, 2023, as Appl. No. 18/473,251.
Claims priority of application No. 202211651243.2 (CN), filed on Dec. 21, 2022.
Prior Publication US 2024/0011948 A1, Jan. 11, 2024
Int. Cl. G01N 29/44 (2006.01)
CPC G01N 29/44 (2013.01) 4 Claims
OG exemplary drawing
 
1. A method for constructing a surface stress distribution cloud map based on critical refraction longitudinal wave detection, comprising the following steps:
S1, dividing a surface of a detected article into meshes, wherein the meshes comprise a plurality of mesh transverse lines, a plurality of mesh longitudinal lines, and mesh nodes are defined by the plurality of mesh transverse lines and the plurality of mesh longitudinal lines;
S2, acquiring a mean transverse stress on different mesh transverse lines and a mean longitudinal stress on different mesh longitudinal lines on the surface of the detected article respectively by a critical refraction longitudinal wave detection method according to the meshes divided on the surface of the detected article; specifically comprising:
detecting a transverse propagation duration of critical refraction longitudinal waves on different mesh transverse lines on the surface of the detected article by the critical refraction longitudinal wave detection method;
calculating the mean transverse stress on the corresponding mesh transverse lines according to the transverse propagation duration of the critical refraction longitudinal waves on different mesh transverse lines, with a specific calculation formula as follows:
σ=B(t1−t0)+σ0
in the formula, σ1 represents a corresponding mean transverse stress on a mesh transverse line, t2 represents the transverse propagation duration of the critical refraction longitudinal wave on the mesh transverse line, B represents a stress-acoustic time difference coefficient corresponding to the detected article, t0 represents the critical refraction longitudinal wave propagation duration corresponding to the detected article under a zero stress state, and σ0 represents a zero stress corresponding to the detected article;
detecting the longitudinal propagation duration of critical refraction longitudinal waves on different mesh longitudinal lines on the surface of the detected article by the critical refraction longitudinal wave detection method;
calculating the mean longitudinal stress on the corresponding mesh longitudinal lines according to the longitudinal propagation duration of the critical refraction longitudinal waves on different mesh longitudinal lines, with a specific calculation formula as follows:
σ2=B(t2−t0)+σ0
in the formula, σ2 represents the corresponding mean longitudinal stress on a mesh longitudinal line, t2 represents the longitudinal propagation duration of the critical refraction longitudinal wave on the mesh longitudinal line, B represents a stress-acoustic time difference coefficient corresponding to the detected article, t0 represents the critical refraction longitudinal wave propagation duration corresponding to the detected article under the zero stress state, and σ0 represents the zero stress corresponding to the detected article;
S3, calculating the equivalent stress of each mesh node according to the mean transverse stress on different mesh transverse lines and the mean longitudinal stress on different mesh longitudinal lines on the surface of the detected article; specifically comprising:
solving the equivalent stress of each mesh node by a Von Mises stress formula according to the mean transverse stress on different mesh transverse lines and the mean longitudinal stress on different mesh longitudinal lines on the surface of the detected article, with a specific formula as follows:

OG Complex Work Unit Math
in the formula, σ represents the equivalent stress value of a mesh node, σ1 represents the mean transverse stress corresponding to the mesh transverse line of the mesh node, σ2 represents the mean longitudinal stress corresponding to the mesh longitudinal line of the mesh node, σ3 represents the stress of the mesh node perpendicular to the direction of the surface of the detected article, and the value of σ3 is zero;
S4, drawing a stress distribution cloud map of the surface of the detected article according to the equivalent stress of each mesh node.