Nylon material tension and torsion combination yield criterion and establishing method thereof

A method of establishing a nylon technology, applied to the analysis of materials, measuring devices, instruments, etc., can solve the problems of not giving the combined yield criterion and strength theory of nylon tension and torsion, and the lack of a standard for the calculation of the strength of nylon materials.

Active Publication Date: 2018-12-07
XUZHOU NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

At present, the existing technology has not clearly given the yield criterion suitable for nylon materials, let alone the yield criterion and strength theory for the combination of nylon tension and torsion, and lacks a standard for the strength calculation of nylon materials widely used in engineering

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  • Nylon material tension and torsion combination yield criterion and establishing method thereof
  • Nylon material tension and torsion combination yield criterion and establishing method thereof
  • Nylon material tension and torsion combination yield criterion and establishing method thereof

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Embodiment Construction

[0077] In this embodiment, nylon 6 is taken as an example to provide a method for establishing the combined yield criterion of nylon 6 material in tension and torsion. The general idea of ​​the method is as follows figure 1 As shown, reprocess the tension and torsion standard test piece (see figure 2 ), calculate the density of the test piece according to the volume and mass, and then fix the two acoustic emission sensors parallel to the axial direction on the surface of the test piece at a distance of 30 mm from the middle section, turn on the sound emission instrument, and place it at a distance of 20 mm from the center of the test piece as For the lead breaking point, conduct the lead breaking test 3 times respectively. After the 6 lead breaking tests, use the sound velocity calibration function of the software to calculate and record the sound velocity value of each test piece, and finally perform the tensile torsion loading test.

[0078] In this embodiment, 6 tensile an...

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Abstract

The invention relates to a nylon material tension and torsion combination yield criterion and an establishing method thereof. The establishing method comprises the following steps: firstly measuring the density of a nylon material, performing acoustic emission lead breakage test on the processed tension and torsion standard test piece to obtain sound velocity values of each test piece, testing thetest pieces according to the set tension and torsion loading scheme and acquiring a mechanical signal, analyzing and calculating each yield stress of tension and torsion, drawing according to experimental data and verifying to obtain Mises yield criterion as a yield criterion in nylon tension and torsion combination, and fitting based on the experiment data to obtain a relationship model of second invariants (relates to density, sound velocity, tension and torsion loading rate) of stress deviator tension in the Mises yield criterion, thus obtaining the corrected nylon tension and torsion Mises yield criterion. The equivalent stress can be obtained in tension and torsion yield by the criterion through sound velocity, density, tension and torsion loading velocity determined before loading,and the strength conditions are established to calculate the corresponding tension and torsion strength.

Description

technical field [0001] The present invention relates to a yield criterion and its establishment method when combined nylon material is subjected to tensile-torsion combined deformation. The method is based on the Mises yield criterion and establishes the second invariant of the stress deflection tensor when nylon is combined with tension and torsion Regarding the fitting relationship of density, sound velocity, tensile loading rate, and torsional loading rate, the modified nylon tension-torsion Mises yield criterion is obtained, and the yield criterion suitable for nylon material tension-torsion combination is established, which belongs to the field of material mechanical performance test analysis. Background technique [0002] Nylon (PA) is a kind of polymer material containing amide groups in the repeating structural unit of the molecular main chain. It is widely used in machinery, military industry, transportation, cables and other fields because of its good comprehensive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
CPCG01N3/00
Inventor 李顺才卓士创邵佳杰喻秋吴春力
Owner XUZHOU NORMAL UNIVERSITY
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