Rotary bending fatigue S/N curve fitting test method for aviation hydraulic conduit

A bending fatigue and curve fitting technology, applied in the application of stable bending force to test the strength of materials, the test of machine/structural components, and the application of repetitive force/pulse force to test the strength of materials, etc. The number of parts is large and the test process is complicated, so as to reduce the test cost, simplify the test process and shorten the test cycle.

Active Publication Date: 2022-07-29
沈阳美茵联合检测有限公司
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Problems solved by technology

[0004] However, the current aviation hydraulic conduit rotating bending fatigue S / N curve fitting test method has the problems of complex test process, large number of test pieces required, and long test period.

Method used

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  • Rotary bending fatigue S/N curve fitting test method for aviation hydraulic conduit
  • Rotary bending fatigue S/N curve fitting test method for aviation hydraulic conduit
  • Rotary bending fatigue S/N curve fitting test method for aviation hydraulic conduit

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0028] combine Figure 2 to Figure 4 As shown in the figure, a method for testing and fitting the S / N curve of the rotational bending fatigue of an aviation hydraulic conduit provided by the embodiment of the present invention includes the following steps:

[0029] First, according to the tensile strength limit value of the hydraulic conduit 63, the test groups and test bending stress values ​​are determined. One test piece from each group is installed on the rotating bending fatigue test equipment, and the rotation is carried out under the specified differe...

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Abstract

The invention discloses a rotary bending fatigue S/N curve fitting test method for an aviation hydraulic conduit, which comprises the following steps: respectively applying different bending stresses to test pieces according to the tensile strength limit value of the hydraulic conduit, mounting the test pieces on rotary bending fatigue test equipment, and respectively carrying out rotary bending fatigue test on each test piece; at least eight test pieces are selected for testing, it is guaranteed that the cycle index is 104-105, 105-106 and 106-107, and two test pieces fail in the interval larger than 107; fitting an S/N curve by adopting a three-parameter power function according to the bending stress and the cycle index obtained by the test; according to the invention, the test process is simplified, the test period is shortened, the test cost is reduced, and the fatigue characteristics of the hydraulic conduit can be well and intuitively reflected.

Description

technical field [0001] The invention belongs to the technical field of performance testing of pipe fittings, and in particular relates to an S / N curve fitting test method for rotational bending fatigue of an aviation hydraulic conduit. Background technique [0002] The hydraulic system of the aircraft is an important part of the aircraft. The hydraulic conduits in the aircraft hydraulic system must ensure reliable operation, and its working reliability affects the safe flight of the aircraft. Fatigue damage to fracture of hydraulic conduits due to excessive bending stress in parts of hydraulic conduits is the main failure form of hydraulic conduits; the materials for making hydraulic conduits are aluminum alloys or other metal materials, which are far lower than the tensile strength of the material. The phenomenon of material failure under cyclic stress is called fatigue failure. In order to prevent the failure of the hydraulic conduit from bringing safety hazards to the fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/20G01N3/02G01M13/00
CPCG01N3/32G01N3/20G01N3/02G01M13/00G01N2203/0073
Inventor 付凤仪陈琳
Owner 沈阳美茵联合检测有限公司
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