Dynamic mechanical property testing device for amorphous alloy and method thereof

A technology of dynamic mechanics and amorphous alloys, applied in measuring devices, scientific instruments, strength characteristics, etc., can solve difficult problems such as the study of dynamic mechanical properties of amorphous alloys

Active Publication Date: 2021-10-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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AI-Extracted Technical Summary

Problems solved by technology

The above problems make it difficult to apply the Hopkinson experimental tec...
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Method used

(3) sample 7 is placed between incident rod 4 and transmission rod 9, and the outer diameter that 18Ni300 maraging steel is made is that 16mm, inner diameter are 7mm, height is that the limit ring 6 of 2.85mm is placed on Around the sample, a spacer 5 made of 18Ni300 maraging steel with a diameter of 16 mm and a height of 3 mm is placed at both ends of sample 7 to ensure the coaxiality of the entire loading device, and both ends of sample 7 are coated with MoS2 to reduce friction; The diameter of the copper sheet 2 of the waveform shaper in this comparative example is 12mm, and the thickness is 2mm. The upper half of the recovery device 8 with through holes at both ends is fixed on the loading rod, and the lower half is located directly below the sample 7 to be tested for recovering the sample 7 .
(3) sample 7 is placed between incident rod 4 and transmission rod 9, and the outer diameter that 18Ni300 maraging steel is made is that 16mm, inner diameter are 7mm, height is that the limit ring 6 of 2.85mm is placed on Around the sample, a spacer 5 made of 18Ni300 maraging steel with a diameter of 16 mm and a height of 3 mm is placed at both ends of sample 7 to ensure the coaxiality of the entire loading device, and both ends of sample 7 are coated with MoS2 to reduce friction; The diameter of the wave shaper copper sheet 2 in this embodiment is 6mm, and the thickness is 2mm. The upper half of the recovery device 8 with through holes at both ends is fixed on the loading rod, and the lower half is located directly below the sample 7 to be tested for recovering the sample 7 .
(3) sample 7 is placed between incident rod 4 and transmission rod 9, and the outer diameter that 18Ni300 maraging steel is made is that 16mm, inner diameter are 7mm, height is that the limit ring 6 of 2.85mm is placed on Around the sample, a spacer 5 made of 18Ni300 maraging steel with a diameter of 16 mm and a height of 3 mm is placed at both ends of sample 7 to ensure the coaxiality of the entire loading device, and both ends of sample 7 are coated with MoS2 to reduce friction; The diameter of the wave shaper red copper sheet 2 in this embodiment is 6mm, and the thickness is 1mm. The upper half of the recovery device 8 with through holes at both ends is fixed on the loading rod, and the lower half is located directly below the sample 7 to be tested for recovering the sample 7 .
Paste red copper sheet 2 near the end face center of impact bar 1 at incident rod 4, the ratio of red copper sheet 2 diameters and loading rod diame...
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Abstract

The invention discloses a dynamic mechanical property testing device for amorphous alloy and a method thereof. The device comprises a loading rod, a buffer device, a sample, a strain gauge, a red copper sheet, a super dynamic strain gauge and a computer data acquisition system, and the loading rod comprises an impact rod, an incident rod, a transmission rod and an absorption rod which are coaxially arranged in sequence. According to the invention, improvement is carried out on the basis of an existing Hopkinson bar experiment, and a waveform shaper (red copper sheet) with a specific size, a cushion block, a limiting ring and a recovery device are added, so that the problems of non-uniform stress, non-constant strain rate deformation, stress wave dispersion, difficulty in recovery and the like caused by high strength and poor plasticity of an amorphous alloy are solved; the strain rate of the amorphous alloy sample to be tested can be changed by changing the diameter and the thickness of the red copper sheet of the shaper, and the dynamic mechanical property of the amorphous alloy under the high strain rate can be accurately obtained.

Application Domain

Strength properties

Technology Topic

Strain gaugeStress wave +8

Image

  • Dynamic mechanical property testing device for amorphous alloy and method thereof
  • Dynamic mechanical property testing device for amorphous alloy and method thereof
  • Dynamic mechanical property testing device for amorphous alloy and method thereof

Examples

  • Experimental program(2)
  • Comparison scheme(1)

Example Embodiment

[0080] Example 1
[0081] (1) Preparation ZR 58 Cu 12 Ni 12 Al 15 NB 3 Amorphous alloy: Zr, Cu, Ni, Al, Nb, and 5 metals with purity ≥99.99%, according to atomic percentage 58: 12: 12: 12: 15: 3, in high purity argon atmosphere, arc smelting, first Slubing the Zr-Nb dual alloy, then mixed with other metal elements, the mild macaronium, then the alloy ingot was melted into the copper mold, and the copper mold size was φ5 mm * 50 mM, and the Zr group amorphous alloy sample was prepared.
[0082] (2) Processing the sample into a cylindrical sample of φ3mm * 3 mm 7, using 400 # -2000 # sandpaper from small to the upper bottom surface of the large grinding cylindrical sample, so that the plane of the two end faces of the sample 7 is better than 5 μm, and then Rinse dry with anhydrous ethanol.
[0083] (3) Place the sample 7 between the incident rod 4 and the transmitted rod 9, the outer diameter of the 18Ni300 martensite-effect steel is 16 mm, the inner diameter is 7mm, the height of 2.85 mm is placed around the sample, The sample 7 is placed at both ends of the 18ni300 martensite, and the mass 5 having a diameter of 16 mm and a height of 3 mm, ensures the coaxial degree of the entire load device, and the two end faces of the sample 7 are applied to MOS. 2Reduce friction; Examples waveform shaper diameter copper plate 2 in this embodiment is 6mm, a thickness of 2mm. The recovery device provided with through holes at both ends of the upper half of the load bar 8 is fixed to the lower half 7 is positioned directly below the test sample, the sample 7 for recovery.
[0084] (4) the compressed gas pressure in the air gun was 0.4MPa, strikes a striking lever at a front end of the rod 4 enters the gas pressure of the copper sheet 2, the sample 7 is compressed and deformed, the strain gauge 3 will be collected incident wave, the reflected and transmitted waves 12 transmitted by the high dynamic strain to a computer 13, a waveform of FIG incident, reflected and transmitted waves in the computer 13, such as figure 2 Shown; using computer software in the D-wave waveform chart obtained is processed to give an amorphous dynamic compression test specimen strain rate - time curve, such as image 3 Shown; stress - strain curve, such as Figure 4 Indicated.
[0085] (5) by the image 3 Dynamic compressive strain rate - time curve shows that the presence of the internet strain rate curve, corresponding to the embodiment of this constant strain rate 1200s- 1. Depend on Figure 4 Accordingly, under this strain rate, dynamic compression strength was 1497MPa, the dynamic strain at break was 1.95%.
[0086] (6) For the present embodiment, amorphous alloy, Sample 7 the length L s Of 3mm, under dynamic loading, sample 7 break strain was 1.95%. The stress balancing requirements calculated by the equation (1) limit strain rate 7834s- 1 , Far above the corresponding dynamic loading of the present embodiment, constant strain rate 1200s- 1 This experiment, the stress balancing requirements to meet; In the present embodiment, the parameters for the Hopkinson bar: density ρ = 7.9g / cm 3 , Diameter D = 16mm, the longitudinal wave velocity C = 5189m / s, Poisson's ratio ν = 0.3; Sample 7 parameters: - density ρ s = 6.55g / cm 3 Diameter D s = 3mm, a length L s = 3mm, longitudinal wave velocity Cs = 4821m / s. Constant strain rate limit values ​​into the above equation (2), the sample is calculated 2235s- 1; (3) calculate the minimum dispersion effect of strain rate corresponding to the limit by the formula 2507s- 1 , Strain rate greater than the time of the present embodiment dynamically loaded embodiment 1200s- 1. In summary, the present embodiment satisfy the amorphous alloy SHPB experimental stress balance, and the constant strain rate loading effect requires a minimum dispersion, Thus, the dynamic compression results are reliable.

Example Embodiment

[0087] Example 2
[0088] Preparation of (1) Zr 63 CU 12 Ni 12 Al 10 NB 3 Amorphous Alloy: purity ≥99.99% of Zr, Cu, Ni, Al, Nb, 5 63 atomic percent of metal in accordance with: for 3 ratio, arc melting under high purity argon gas atmosphere, first: 12: 12: 10 melting Zr-Nb binary alloy, and then mixed with other metal elements melting the mother alloy ingot, the alloy ingot is then poured into the molten copper mold, copper mold size Φ5mm * 50mm, the preparation of Zr-based amorphous alloy sample.
[0089] (2) the sample was processed into a cylindrical sample Φ3mm * 3mm 7, using # -2000 # 400 emery paper down to a bottom surface of large from small sample grinding cylinder, so that the flatness of the two end faces of the sample 7 is better than 5 m, then rinsing and drying with anhydrous ethanol.
[0090] (3) The sample is placed in the entrance 7 between the rod 4 and the transmission rod 9, the outside diameter of the maraging steel 18Ni300 16mm, an inner diameter of 7mm, the height of the surrounding ring 6 is placed in the sample limit is 2.85mm, sample 7 is placed at both ends of maraging steel made 18Ni300 diameter of 16mm, a height of 3mm pad 5, to ensure concentricity of the entire loading apparatus, the two end faces 7 samples are applied MoS 2 Reduce friction; Examples waveform shaper diameter copper plate 2 in this embodiment is 6mm, a thickness of 1mm. The recovery device provided with through holes at both ends of the upper half of the load bar 8 is fixed to the lower half 7 is positioned directly below the test sample, the sample 7 for recovery.
[0091] (4) the compressed gas pressure in the air gun was 0.4MPa, strikes a striking lever at a front end of the rod 4 enters the gas pressure of the copper sheet 2, the sample 7 is compressed and deformed, the strain gauge 3 will be collected incident wave, the reflected and transmitted waves 12 transmitted by the high dynamic strain to a computer 13, a waveform of FIG incident, reflected and transmitted waves in the computer 13, such as Figure 5 Shown; using computer software in the D-wave waveform chart obtained is processed to give a stress test sample of amorphous - strain curve, such as Image 6 Indicated.
[0092] (5) by the Figure 5 Waveform seen in FIG strain rate internet presence reflected wave is calculated in this case a constant strain rate corresponding to the embodiment 1450s- 1. Depend on Image 6 Accordingly, under this strain rate, dynamic compression strength was 1483MPa, the dynamic strain at break was 1.85%.
[0093] (6) For the present embodiment, amorphous alloy, Sample 7 the length L s Of 3mm, under dynamic loading, sample 7 break strain was 2.65%. 1, the sample in Example 7 parameters Parameter same embodiment as Hopkinson bar: the density ρ s = 6.75g / cm 3 Diameter D s = 3mm, a length L s = 3mm, longitudinal wave velocity Cs = 4823m / s. The stress balancing requirements calculated by the equation (1) limit strain rate 7435s- 1 , Constant strain rate limit by the formula (2) the sample is calculated 2209s- 1; (3) calculate the minimum dispersion effect of strain rate corresponding to the limit by the formula 2379s- 1 , Strain rate greater than the time of the present embodiment dynamically loaded embodiment 1450s- 1. In summary, the present embodiment satisfy the amorphous alloy SHPB experimental stress balance, and the constant strain rate loading effect requires a minimum dispersion, Thus, the dynamic compression results are reliable.

PUM

PropertyMeasurementUnit
Diameter16.0mm
Length1000.0mm
Length200.0mm

Description & Claims & Application Information

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