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Method for measuring microscopic mechanical property parameter of press-fitting material

A micromechanics and performance technology, applied in the direction of testing material hardness, etc., can solve the problems of inability to accurately know the micromechanical properties of indented convex materials, inability to quickly and effectively calculate the indenter, etc., to achieve the effect of low cost and wide adaptability

Active Publication Date: 2016-12-07
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0011] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for measuring the microscopic mechanical performance parameters of the indented convex material. Its purpose is to propose a calculation method for the actual contact area of ​​the indenter, and accurately On the basis of calculating the actual contact area of ​​the indenter, the micromechanical performance parameters of the pressed-in convex material are calculated. The calculation method of the actual contact area of ​​the indenter is accurate and reliable, thus solving the problem that the existing technology cannot quickly and effectively calculate the actual contact area of ​​the indenter A true , corresponding to the problem that it is impossible to accurately know the microscopic mechanical properties of pressed-in convex materials

Method used

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  • Method for measuring microscopic mechanical property parameter of press-fitting material
  • Method for measuring microscopic mechanical property parameter of press-fitting material
  • Method for measuring microscopic mechanical property parameter of press-fitting material

Examples

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Embodiment 1

[0048] This embodiment is used to calculate Zr 65 Cu 17.5 Al 7.5 Ni 10 Young's modulus E of the amorphous alloy. Zr 65 Cu 17.5 Al 7.5 Ni 10 The amorphous alloy has obvious press-in convex characteristics. Its Young's modulus measured by ultrasonic resonance spectrum method is 80.56 ± 0.27GPa, which is consistent with literature (A.Inoue, A.Takeuchi, Recent development and application products of bulk glassy alloys, Acta Mater, 59(2011) 2243-2267. and M . Fukuhara, X.M.Wang, A.Inoue, F.X.Yin, Low temperature dependence of elastic moduli and internal friction for the glassyalloy Zr55Cu30Al10Ni5, PHYSICA STATUS SOLIDI-RAPID RESEARCHLETTERS, 1(2007) 220-222. Value, to compare with the measured value in this embodiment, so as to judge the accuracy of the method of this embodiment.

[0049] The preparation method of the amorphous alloy sample is to first obtain the rod material by the copper mold suction casting method, and then conduct the nano-indentation test after cutti...

Embodiment 2

[0063] This embodiment is used to calculate Zr 60.525 Cu 19.35 Al 10 Ni 10.125 Young's modulus E of the amorphous alloy. Zr 60.525 Cu 19.35 Al 10 Ni 10.125 The amorphous alloy has obvious press-in convex characteristics. The Young's modulus 82GPa in the literature (W.H.Wang, The elastic properties, elastic models and elastic perspectives of metallic glasses, Prog MaterSci, 57(2012) 487-656.) was used as the standard value for comparison.

[0064]The preparation method of the amorphous alloy sample is to first obtain the rod material by the copper mold suction casting method, and then conduct the nano-indentation test after cutting, mounting the sample and grinding. In this example, each experimental process is located at a different position on the sample surface, and the indentations are separated by a certain distance to avoid mutual influence of test results.

[0065] S1: Carry out nano-indentation test on the tested sample, 36 times in total, 9 tests under the max...

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Abstract

The invention discloses a method for measuring microscopic mechanical property parameter of a press-fitting material. The method comprises the following steps: S1, executing a nanoindentation test; S2, according to a load-displacement curve obtained by the nanoindentation test, calculating a contact depth hc and a contact area Aop of a pressure head; S3, according to a following formula, calculating the practical contact area Ature of the pressure head, wherein, k1 is the indentation deformation coefficient during an unloading process, k1 is 1.1-1.2, k2 is a deviation factor of the practical pressure head and an ideal pressure head, k2 is 61-62, f(P) is the size effect symptom coefficient during a nanoindentation process, f(P) is 0.30-0.01 P, P is maximum load, and the unit is mN; and S4, calculating young modulus E and hardness H of the press-fitting material based on Ature. The method can accurately and rapidly obtain the practical contact area of the pressure head of the press-fitting material, extra expensive equipment is not required, and the cost is low.

Description

technical field [0001] The invention relates to the field of characterization of the microscopic mechanical properties of materials, and more particularly, relates to a method for measuring the parameters of the microscopic mechanical properties of pressed-in convex materials. Background technique [0002] As modern manufacturing enters the microscopic field, the characterization of the micromechanical properties of materials has always been a hot spot in basic research. Due to reasons such as sample size and clamping, the application of conventional mechanical test methods such as tension, compression, and bending torsion on the microscale has been limited. Very restrictive. The nanoindentation method has received extensive attention since it was proposed by Oliver and Pharr in the 1990s. This method is a micro-region and micro-damage test method that can be tested on micron-scale samples. It is of great significance to test the mechanical properties of microstructures and...

Claims

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Application Information

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IPC IPC(8): G01N3/42
Inventor 廖广兰张贻春史铁林洪源王肖陈科鹏文弛王文东王金云
Owner HUAZHONG UNIV OF SCI & TECH
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