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Circumferential shear test method and apparatus for a sandwich structure

A technology for testing samples and test fixtures, applied in the direction of testing material strength by applying stable torsion force, testing material strength by applying stable shear force, testing material strength by applying stable tension/compression, etc., and can solve the problem of bending sandwich structures Inaccurate mechanical properties, careless design and structure, etc.

Active Publication Date: 2015-02-25
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, traditional design methods using flat panel test data can lead to imprudent design configurations using inaccurate mechanical properties of curved sandwich structures.

Method used

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  • Circumferential shear test method and apparatus for a sandwich structure
  • Circumferential shear test method and apparatus for a sandwich structure
  • Circumferential shear test method and apparatus for a sandwich structure

Examples

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Embodiment Construction

[0022] Referring now to the accompanying drawings, in which illustrations are made to illustrate various embodiments of the present disclosure, figure 1 Shown in is a test specimen 100 having a sandwich structure 102 in the shape of an arc. As disclosed herein, test specimen 100 may be mounted in test fixture 198 ( figure 2 ), used to determine the shear properties of the test sample 100. For example, test fixture 198 may provide for determining circumferential shear properties of test specimen 100 (such as shear stiffness or modulus, static shear strength, and / or fatigue shear capacity of test specimen 100 in the circumferential direction) installation.

[0023] exist figure 1 In the illustrated test sample 100 is formed as a sandwich structure 102 with a core 112 inserted between an inner panel 108 and an outer panel 110 . The illustrated test specimen 100 is formed into ninety (90) degree arc segments such that the radius of curvature of the inner panel 108 is approxim...

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PUM

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Abstract

A test fixture (198) for determining circumferential shear properties of an arcuate test specimen (100) may include an outer fixture (220) and an inner fixture (200). The outer fixture (220) may be coupled to an outer side (106) of the test specimen (100), and may be rotatably mounted on a central pin (240) and may include a rocker arm (228). The inner fixture (200) may be coupled to an inner side (104) of the test specimen (100), and may be rotatably mounted on the central pin (240) and may include a load arm (204) extending in a direction opposite the rocker arm (228). The inner fixture (200) and the outer fixture (220) may be configured such that application of a test load (280) to the rocker arm (228) and the load arm (204) causes rotation thereof about the central pin (240) producing circumferential movement of the inner side (104) relative to the outer side (106) and inducing a circumferential shear load (150) in the test specimen (100).

Description

technical field [0001] The present disclosure relates generally to structural testing and, more particularly, to testing systems for determining the shear properties of structures. Background technique [0002] Sandwich structures are used in a wide variety of applications across a wide range of industries. The sandwich structure consists of a lightweight core bounded by face sheets on opposite sides. The panels can be formed from metallic or non-metallic materials. The core may have a porous construction such as foam or honeycomb. The core may also be formed in a corrugated or bundled configuration. Due to the relatively low mass of the core, sandwich structures advantageously have a relatively high stiffness-to-weight ratio compared to solid metal panels and solid composite laminates. In addition, the sandwich structure has a relatively high strength-to-weight ratio due to the relatively low density of the core. [0003] During the design and development of sandwich s...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/24
CPCG01N2203/0025G01N3/04G01N3/24G01N3/08G01N3/22G01N3/26G01N3/562
Inventor P·S·格雷格
Owner THE BOEING CO