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CN-224231444-U - Fixed knot constructs and test device suitable for oval sheet metal buckling performance test

CN224231444UCN 224231444 UCN224231444 UCN 224231444UCN-224231444-U

Abstract

The utility model discloses a fixing structure suitable for testing the buckling performance of an elliptical sheet, which comprises a fixing frame, clamping plates, arc clamps and a sheet test piece, wherein the periphery of each clamping plate is connected with the fixing frame, an elliptical opening is formed in the center of each clamping plate, the peripheral side area of each sheet test piece is clamped in each clamping plate, the central area is exposed at the elliptical opening, the arc clamps are annularly arranged at the inner edge of each elliptical opening and are connected with the clamping plates, two groups of arc clamps clamp the sheet test piece from two sides to form a circumferentially continuous clamped boundary, and the elliptical test sheet is equivalently constructed on each sheet test piece. The utility model also provides a test device suitable for testing the buckling performance of the elliptical sheet, which is provided with the fixing structure, and further comprises a loading unit, a monitoring unit and an initial defect inspection system, wherein the elliptical sheet is subjected to three-dimensional data acquisition.

Inventors

  • YANG CHUAN
  • DONG YULI
  • QI JIANQUAN
  • ZHANG DASHAN

Assignees

  • 华侨大学

Dates

Publication Date
20260512
Application Date
20250520

Claims (10)

  1. 1. A fixing structure suitable for testing the buckling performance of an elliptical sheet is characterized by comprising a fixing frame, clamping plates, an arc clamp and a sheet test piece: The periphery of the clamping plate is connected with the fixed frame, an elliptical opening is formed in the center of the clamping plate, the peripheral side area of the thin plate test piece is clamped in the clamping plate, the central area is exposed at the elliptical opening, the arc-shaped clamps are annularly arranged at the inner edge of the elliptical opening and are connected with the clamping plate, two groups of arc-shaped clamps clamp the thin plate test piece from two sides to form a circumferentially continuous clamped boundary, and an elliptical test thin plate is equivalently constructed on the thin plate test piece.
  2. 2. The fixture structure of claim 1, wherein said arcuate clamp is configured with a notch at least one intersection with the major axis of the ellipse.
  3. 3. The fixing structure for testing the buckling performance of the elliptical sheet according to claim 1, wherein the two groups of arc clamps positioned on two sides of the sheet test piece are made of anisotropic magnetic materials.
  4. 4. The fixing structure suitable for testing the buckling performance of the elliptical sheet according to claim 1, wherein the clamping plate is provided with a connecting portion perpendicular to the plate surface direction at the edge, and the connecting portion is connected with the fixing frame through a plurality of first connecting pieces.
  5. 5. The fixing structure for testing the buckling performance of the elliptical thin plate according to claim 1, wherein the clamp support is arranged at the edge of the elliptical opening of the clamping plate, and the arc-shaped clamp group is connected with the clamp support through a plurality of second connecting pieces arranged at intervals along the circumferential direction.
  6. 6. The fixing structure for testing the buckling performance of the elliptical sheet according to claim 1, wherein the fixing frame is a rigid space frame formed by connecting a plurality of section steel, and a transverse base is arranged at the bottom.
  7. 7. The test device suitable for testing the buckling performance of the elliptical sheet comprises the fixing structure as set forth in any one of claims 1 to 6, and is characterized by further comprising a loading unit and a monitoring unit: The output end of the loading unit is connected with the clamping plate and used for applying load to the clamping plate along the major axis or the minor axis direction of the elliptical opening, and the monitoring unit is arranged on any side of the sheet test piece and used for collecting deformation data of the elliptical test sheet in the buckling process.
  8. 8. The test device for testing buckling performance of an oval sheet according to claim 7, further comprising an initial defect inspection system for collecting and quantifying initial geometric defects of the oval test sheet.
  9. 9. The test device for testing buckling performance of an elliptical sheet according to claim 7, wherein the monitoring unit comprises a three-dimensional full-field strain-deformation measuring system.
  10. 10. The test device for testing the buckling performance of the elliptical thin plate according to claim 7, wherein the loading unit comprises a servo actuator, and the output end of the servo actuator is fixedly connected with the top of the clamping plate through a rigid connecting piece.

Description

Fixed knot constructs and test device suitable for oval sheet metal buckling performance test Technical Field The utility model relates to the technical field of test equipment, in particular to a test device suitable for testing the buckling performance of an elliptical sheet. Background In the field of manufacturing high-end equipment such as aerospace, elliptical sheets are widely used for key bearing structures such as fuselage skins, fuel bulkheads and the like due to excellent aerodynamic performance and lightweight characteristics. Such sheets are typically much smaller in thickness than the length and width dimensions and are extremely susceptible to buckling failure under axial compressive loading. In the physical test research of the buckling performance of the elliptical sheet, the unique geometric characteristics of the elliptical sheet bring certain challenges that the traditional test device is difficult to realize continuous and stable clamping of an elliptical boundary, and the mechanical clamp is easy to cause edge stress concentration or bring excessive constraint, so that loading simulation distortion is caused. In the prior art, researchers often replace physical tests with simplified boundary conditions or finite element simulations, but idealized assumptions of boundary conditions can lead to deviations of test data from true operating conditions. There are techniques or attempts to fix oval sheets by custom-made jigs, but there are problems such as uneven distribution of clamping force, discontinuous boundary constraints, etc. The limitation severely restricts the deep research on the buckling performance of the elliptical sheet and also influences the reliability of the structural optimization design. How to construct a test device which can accurately simulate the boundary constraint of an ellipse and has higher test precision becomes a technical problem to be solved in the field. Disclosure of utility model The utility model aims to provide a test device suitable for testing the buckling performance of an elliptical sheet so as to accurately test the buckling performance of the elliptical sheet. In order to solve the technical problems, the utility model provides a fixing structure suitable for testing the buckling performance of an elliptical sheet, which comprises a fixing frame, a clamping plate, an arc-shaped clamp and a sheet test piece; The periphery of the clamping plate is connected with the fixed frame, an elliptical opening is formed in the center of the clamping plate, the peripheral side area of the thin plate test piece is clamped in the clamping plate, the center area is exposed at the elliptical opening, the arc-shaped clamps are annularly arranged at the inner edge of the elliptical opening and are connected with the clamping plate, two groups of arc-shaped clamps clamp the thin plate test piece from two sides to form a circumferentially continuous clamped boundary, and an elliptical test thin plate is equivalently constructed on the thin plate test piece. In a preferred embodiment, the arcuate clip is configured with a notch at least one intersection with the major axis of the ellipse. In a preferred embodiment, two sets of arc clamps on either side of the sheet test piece are made of dissimilar magnetic materials. In a preferred embodiment, the clamping plate is provided with a connecting part perpendicular to the plate surface direction at the edge, and the connecting part is connected with the fixed frame through a plurality of first connecting pieces. In a preferred embodiment, the edge of the oval opening of the clamping plate is provided with a clamp support, and the arc-shaped clamp group is connected with the clamp support through a plurality of second connecting pieces which are arranged at intervals along the circumferential direction. In a preferred embodiment, the fixed frame is a rigid space frame formed by connecting a plurality of section steel, and a transverse base is arranged at the bottom. The utility model also provides a test device suitable for testing the buckling performance of the elliptical sheet, which comprises the fixing structure, and further comprises a loading unit and a monitoring unit: The output end of the loading unit is connected with the clamping plate and used for applying load to the clamping plate along the major axis or the minor axis direction of the elliptical opening, and the monitoring unit is arranged on any side of the sheet test piece and used for collecting deformation data of the elliptical test sheet in the buckling process. In a preferred embodiment, the test apparatus further comprises an initial defect inspection system for collecting and quantifying initial geometric defects of the elliptical test sheet. In a preferred embodiment, the monitoring unit comprises a three-dimensional full-field strain-deformation measurement system. In a preferred embodiment, the loading unit comprises a servo actuator, and the ou