Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Internal defect identification of solid propellant based on laser shearography
| DOI: | 10.11809/bqzbgcxb2024.05.015 |
| Keywords: | solid propellant; shearography; debonding of liner; holes of grain; optical nondestructive testing |
| Abstract: | A high precision real time nondestructive testing system based on laser shear speckle interferometry technology was built to detect internal defects of solid propellant under negative pressure loading, and the surface speckle interferometry fringe patterns and normalized out of plane displacement values of two different types of defects of interfacial debonding and grain holes were compared and analyzed. The differences of interface bonding strength and surface out of plane displacement of solid propellant with different types of defects were analyzed by peel experiment and finite element numerical simulation. The results show that under the same loading conditions, the normalized out of plane displacement caused by debonding of lining is significantly larger than that caused by the holes in the grain, reaching 1~2 orders of magnitude. This study provides an important approach for the nondestructive testing of solid propellant liner debonding and matrix hole defects. |
| Issue: | Vol. 45 No. 5 (2024) |
| Published: | 2024-05-31 |
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