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A kind of dynamic symmetric stretching device and experimental method of i-type crack sample

A technology of stretching device and crack, which is applied in the field of materials, can solve problems such as difficulty in achieving symmetry of loading force, and achieve the effect of ensuring waveform synchronization

Active Publication Date: 2020-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a dynamic symmetric stretching device and its experimental method for a type I crack sample, which can overcome the problem that the symmetry of the loading force in the prior art is difficult to achieve

Method used

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  • A kind of dynamic symmetric stretching device and experimental method of i-type crack sample
  • A kind of dynamic symmetric stretching device and experimental method of i-type crack sample
  • A kind of dynamic symmetric stretching device and experimental method of i-type crack sample

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Embodiment 1

[0067] Such as figure 1 As shown, this embodiment is a dynamic symmetrical tensioning device for standard compact tensile samples based on electromagnetic force. The loading device described in the Chinese invention patent with the patent number ZL 201510956545.4 is used, including a power supply 1 , capacitor charger 2 and loading gun 3. The capacitor charger 2 adopts the power supply part of the existing electromagnetic riveting equipment. After connecting two loading guns 3 with identical parameters in parallel, they are connected to the capacitor charger 2 . The power supply 1 adopts a three-phase alternating current of 220 volts (V).

[0068]In this embodiment, the capacitor charger 2 adopts the power supply part of the electromagnetic riveting equipment disclosed in the Chinese patent No. 200520079179. In this embodiment, the three rated voltages are 5000 volts and the rated capacitance is 2 millifarads. The pulse capacitors are connected in parallel to form a capacit...

Embodiment 2

[0081] Such as figure 2 and 3 As shown, this embodiment is a dynamic symmetrical tensile device for double cantilever beam samples based on electromagnetic force. The loading device described in the Chinese invention patent with the patent number ZL 201510956545.4 is used, including a power supply 1, Capacitor charger 2 and loading gun 3. The capacitor charger 2 adopts the power supply part of the existing electromagnetic riveting equipment. After connecting two loading guns 3 with identical parameters in parallel, they are connected to the capacitor charger 2 . The power supply 1 adopts 220V three-phase alternating current.

[0082] In this embodiment, the capacitor charger 2 adopts the power supply part of the electromagnetic riveting equipment published in the Chinese patent No. 200520079179. In this embodiment, the six rated voltages are 5000 volts and the rated capacitance is 2 millifarads. The pulse capacitors are connected in parallel to form a capacitor bank, and ...

Embodiment 3

[0095] Such as Figure 4 As shown, this embodiment is a dynamic symmetrical tensioning device for a centrally penetrating crack sample based on electromagnetic force. The loading device is the loading device proposed in the Chinese invention patent with the patent number ZL 201510956545.4, including a power supply 1 , capacitor charger 2 and loading gun 3. The capacitor charger 2 adopts the power supply part of the existing electromagnetic riveting equipment. After connecting two loading guns 3 with identical parameters in parallel, they are connected to the capacitor charger 2 . The power supply 1 adopts 220V three-phase alternating current.

[0096] In this embodiment, the capacitor charger 2 adopts the power supply part of the electromagnetic riveting equipment disclosed in the Chinese patent No. 200520079179. In this embodiment, the three rated voltages are 5000 volts and the rated capacitance is 2 millifarads. The pulse capacitors are connected in parallel to form a ca...

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Abstract

The invention relates to an experimental method for testing fracture mechanical properties in the field of material, and discloses a type I crack specimen dynamic symmetrical tensile device and an experimental method thereof. The specimen dynamic symmetrical tensile device includes a power supply, a capacitor charger, loading guns and a waveguide-rod rod system. The capacitor charger adopts a power supply part of a conventional electromagnetic riveting device; two loading guns with the same parameters are connected in parallel and then access the capacitor charger. The invention also relates to the experimental method based on the specimen dynamic symmetrical tensile device. Because the parameters of the two loading guns are the same and access the capacitor charger in parallel, the discharge current can be synchronously and evenly distributed into the two loading guns, same compression stress waves are produced in the two loading guns, are reflected into tensile waves in two convex platforms respectively and then enter tensile rods, and the specimen is loaded; therefore, the specimen can be symmetrically loaded, and a specimen crack is guaranteed to be extended into a type I spallation crack.

Description

technical field [0001] The invention relates to an experimental method for testing fracture mechanical properties in the field of materials, in particular to a dynamic symmetrical stretching device for a type I crack sample and an experimental method thereof. Background technique [0002] Currently, the fracture toughness measurement of mode I cracks is an important research problem in the field of fracture mechanics. Jose et al. used standard compact tension (Compact Tension, CT) specimens to measure the I-mode interlaminar fracture toughness, and received good results. [0003] Additionally, in the field of fracture mechanics, the double cantilever beam (DCB) test has been the standard test for measuring the mode I quasi-static interlaminar fracture toughness. DCB specimens are also widely used in the measurement of mode I fracture toughness of bondlines. [0004] However, in general, composite laminates are susceptible to out-of-plane impact loads, and interlaminar crac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/005G01N2203/0066
Inventor 李玉龙聂海亮刘会芳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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