Fatigue test device based on optical fiber sensing technology
An optical fiber sensing technology and a fatigue test technology, applied in the field of material performance testing, can solve the problems of high cost, real-time displacement measurement of test pieces, and raw material consumption, and achieve the effects of reducing test costs, saving raw materials, and improving calculation accuracy.
Inactive Publication Date: 2019-02-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
First, the size of the test piece currently used is relatively large, which consumes more raw materials, and the price of the single crystal test piece for the test is not low, and the cost of one test is relatively high; second, when measuring the metal fatigue life, it is necessary The tension-compression displacement is measured in real time, while the existing displacement measurement system uses a tension-compression gauge for measurement. The tension-compression gauge cannot directly and accurately measure the real-time displacement of the test piece, but approximately replaces the test by measuring the real-time displacement of the tension-compression rod. The displacement of the parts, the error is large, and the measured data cannot truly reflect the test results
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[0045] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and that the description and drawings therein are illustrative in nature and not intended to limit the present invention. invention.
[0046] In describing various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of example various exemplary structures, systems and step. It is to be understood that other specific arrangements of components, structures, exemplary means, systems and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "between," "one end," "bottom," etc....
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The invention provides a fatigue test device based on an optical fiber sensing technology. The fatigue test device comprises a loading mechanism, a fixing mechanism and an optical fiber sensor. The loading mechanism comprises a first loading piece and a second loading piece which are arranged oppositely and can move reversely in the tension-compression direction. The fixing mechanism is arranged between the first loading piece and the second loading piece and comprises a first fixing assembly and a second fixing assembly which are arranged oppositely, the first fixing assembly is connected with the first loading piece and can be connected with the first end of a test piece, and the second fixing assembly is connected with the second loading piece and can be connected with the second end ofthe test piece. The optical fiber sensor is detachably mounted on the test piece and used for detecting deformation of the test piece in the tension-compression direction. The fatigue test device canbe used for conducting tension-compression testing on the rod-shaped test piece, raw materials of the test piece can be saved, meanwhile, the deformation amount of the test piece can be precisely measured by adopting the optical fiber sensor, and the calculation precision of the fatigue life is improved.
Description
technical field [0001] The invention belongs to the technical field of material performance testing, in particular to a fatigue test device based on optical fiber sensing technology. Background technique [0002] Mechanical parts, such as shafts, gears, bearings, blades, springs, etc., during the working process, the stress at each point changes periodically with time. This stress that changes periodically with time is called alternating stress (also called cyclic stress) stress). Under the action of alternating stress, although the stress on the parts is lower than the yield point of the material, the phenomenon of cracks or sudden complete fracture after a long period of work is called metal fatigue. [0003] Existing test systems for measuring metal fatigue life suffer from two problems. First, the size of the test piece currently used is relatively large, which consumes more raw materials, and the price of the single crystal test piece for the test is not low, and the ...
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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0017G01N2203/0019G01N2203/0641
Inventor 温志勋岳珠峰杨柳张旭辉毛倩竹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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