Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
  • G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
  • G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
  • G01M5/0058—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems of elongated objects, e.g. pipes, masts, towers or railways
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/0001—Type of application of the stress
  • G01N2203/0005—Repeated or cyclic
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/0014—Type of force applied
  • G01N2203/0023—Bending
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/0058—Kind of property studied
  • G01N2203/006—Crack, flaws, fracture or rupture
  • G01N2203/0067—Fracture or rupture
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/0058—Kind of property studied
  • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
  • G01N2203/0073—Fatigue
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N2203/02—Details not specific for a particular testing method
  • G01N2203/06—Indicating or recording means; Sensing means
  • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors

Definitions

• the invention relates to a device for performing a rotating bending fatigue test for test specimens of circular cross-section, in particular wires, in which the test specimen is repeatedly loaded and thus simulates the behaviour of the material in normal use over a period of time, in order to obtain information on mechanical properties during loading and evaluation of the service life of the materials of machine parts.
• Fatigue tests are performed on smooth or notched test specimens, where the notch is any change in the cross-section and properties of the material, such as a recess, hole, thread, high surface roughness, weld, crack, material defect or other change in material properties.
• a device for performing bending fatigue testing which comprises, among other things, a guide sleeve for fixing the test specimen, which is housed in a cage and in a guide sleeve there is housed a fixing sleeve for clamping the test specimen.
• a horizontal and vertical clamp is connected to the cage, which serves to monitor the course of the load in both load axes of movement with the device frame.
• the fixture consists of a support and a pressure ring, which ensure a mutually concentric mounting and clamping in the direction of the axis of the support shaft.
• the support and pressure rings are provided with a system of regularly distributed semi-circular beds around the circumference, which form cylindrical cavities for the insertion of test specimens from above when the fixture is completed.
• a utility model CN211740855U “Full size marine pipeline resonance rotary bending fatigue testing machine” discloses a device for performing a fatigue test during rotation for ship pipelines, in which vibrations of the test specimen are measured by means of a frequency controller during rotation of the test specimen.
• the device for performing rotating bending fatigue test based on the principle of computer-controlled cyclic loading and software evaluation of measured values
• a frame on which two jaws for mounting the test specimen are mounted according to the present invention, that each jaw is driven by a separate electric motor and their rotational movement is mutually synchronous.
• the frame prefferably consist of at least one fixed part and at least one movable part, the movable part being adapted to change position from vertical to horizontal.
• the mutual angle of the vectors of the jaws is expedient for the mutual angle of the vectors of the jaws to be arbitrarily selectable in the range 0 0 - 270 °.
• jaws it is advantageous for the jaws to be adapted to change position along the clamping bar.
• the device for performing the fatigue bending fatigue test is provided with a force sensor, and it is also preferable to be provided with a sensor for detecting fracture of the test specimen.
• the device for performing the fatigue test by bending during rotation to contain a connection with a computer, for the purpose of monitoring, recording or subsequent calculation of the necessary quantities for determining the material characteristics.
• Figure no. 1 schematically shows a device for performing rotating bending fatigue test under rotation.
• the device is shown in a side view, where the movable part, resp. the jaws are in a vertical position.
• Figure no. 3 shows the motion of the movable part of the frame and the picture no. 4 shows the location of the movable part of the frame, respectively of the jaws in a horizontal position.
• Figure no. 5 shows a front view on the jaw in a horizontal position.
• Device for performing rotating bending fatigue test based on the principle of computer- controlled cyclic loading and software evaluation of measured values comprises a frame 1 on which meters are mounted two jaws 2, 2 J for attaching the test specimen 3, according to this invention resides in the fact that each jaw 2, 2' is driven by a separate electric motor 4, 4' and their rotational movement is mutually synchronous.
• the frame is formed by a fixed part 11 and a movable part 12, which are connected to each other, the movable part 12 being adapted to be tilted from a vertical position to a horizontal position.
• Frame 1 is presented, for example, as an aluminium or steel structure.
• a clamping bar 13 is provided on the frame 1_, which allows the position of the clamping jaws 2, 2' to be changed.
• the clamping bar 13 is placed on the movable part 12 of the frame and when tilting the movable part 12 into a horizontal position an operator thus can easily and securely clamp the test specimen 3_into the jaws 2, 2/.
• the jaws 2, 2 on a clamping bar 13 can move in the horizontal axis, and it is thereby possible to vary their mutual distance and it is also possible to vary the angle which the jaws 2, 2' clamp.
• the device for performing rotating bending fatigue test proceeds in a way that the movable part of the frame 12 is tilted to a horizontal position.
• the mutual angle of the jaws 2, 2' for testing is 120 °, while the magnitude of the angle is chosen depending on the requirements of testing, resp. according to the specified test wire length.
• the movable part 12 of the frame is then turned over into a vertical position in a way that the axis of the jaws 2, 2' altogether with the clamped test specimen 3 facing down, eliminating the gravitational force on a test specimen 3 and eliminating the effect of the results of testing by undesired side bend of weight of the specimen.
• the device is started and the jaws 2, 2' start to rotate synchronously and the test specimen 3 is rotated about its axis.
• Device for performing rotating bending fatigue test based on the principle of a computer-controlled cyclic loading and software evaluation of measured values, can be used in test laboratories and scientific institutions conducting destructive testing to obtain information about the mechanical properties of materials, especially of wires.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• General Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

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Citations (3)

Family Cites Families (3)

• 2021
  • 2021-08-19 CZ CZ2023-289A patent/CZ2023289A3/cs unknown
  • 2021-08-19 WO PCT/CZ2021/000040 patent/WO2022152333A1/en not_active Ceased
  • 2021-08-19 CZ CZ2023-41188U patent/CZ37528U1/cs active Protection Beyond IP Right Term
  • 2021-08-19 PL PL446681A patent/PL446681A1/pl unknown
• 2024
  • 2024-08-19 SK SK108-2023A patent/SK289317B6/sk unknown

Patent Citations (3)

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