Specimen size design method for ultrasonic and tension-compression fatigue test of iron-based powder metallurgical material

An iron-based powder metallurgy and fatigue experiment technology, applied in calculation, special data processing applications, instruments, etc., can solve the lack of methods for testing ultra-high cycle tension and compression fatigue performance, lack of rapid design methods for ultrasonic tension and compression fatigue dimensions, and materials Tension and compression fatigue simulation test and other issues

Inactive Publication Date: 2014-04-09
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, ultrasonic fatigue tests for iron-based powder metallurgy materials still have some deficiencies
First of all, the tension and compression fatigue of materials cannot be simulated well
Secondly, there is currently a lack of methods that can be used to test the ultra-high cycle tension and compression fatigue performance of iron-based powder metallurgy materials
Finally, due to the characteristics of iron-based powder metallurgy materials, materials obtained by different processes often have different densities and elastic moduli, and there is still a lack of a rapid design method for ultrasonic tension-compression fatigue dimensions of iron-based powder metallurgy materials

Method used

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  • Specimen size design method for ultrasonic and tension-compression fatigue test of iron-based powder metallurgical material
  • Specimen size design method for ultrasonic and tension-compression fatigue test of iron-based powder metallurgical material
  • Specimen size design method for ultrasonic and tension-compression fatigue test of iron-based powder metallurgical material

Examples

Experimental program
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Embodiment 1

[0050] Mix Fe, Cu, Ni and Mo powders evenly, carry out partial pre-diffusion treatment at 830°C, mix in 1% graphite and 0.1% lubricant, carry out mold wall lubrication and pressing at 120°C, and the pressing pressure is 650MPa. Afterwards, mesh belt sintering was carried out at 1120°C for 1 hour to obtain an iron-based warm-pressed Fe-Cu-Ni-Mo-C powder metallurgy material, and the measured material density was 7.31g / cm 3 , the tensile strength is 776MPa, and the modulus of elasticity is 156GPa. Then the sample size is calculated, and the shape of the axial tension and compression sample is preset as a dumbbell, such as figure 1 shown. Among them, the calculation of the dumbbell-shaped axial tension-compression specimen is carried out, and the specific process is as follows:

[0051] 1) Draw up R first 1 , R 2 , L 1 data, R 1 is the radius of the thinnest point in the middle of the sample, R 2 is the radius of the cylinder at both ends of the sample, L 1 is half the len...

Embodiment 2

[0084] Mix Fe, Cu, and Mn powders evenly, first perform pre-diffusion treatment at 830°C, then mix in 1% graphite and 0.1% lubricant, and carry out mold wall lubrication and pressing at 120°C with a pressing pressure of 700MPa. Afterwards, mesh belt sintering at 1120°C for 1 hour was carried out to obtain an iron-based warm-pressed Fe-Cu-Mn-C powder metallurgy material. In this example, the measured material density was 7.32g / cm 3 , the tensile strength is 709MPa, and the modulus of elasticity is 146GPa.

[0085] The shape of the pre-set axial tension and compression specimen is dumbbell-shaped, similarly, first set R 1 =1.5mm, R 2 =5mm, L 1 =14mm, then calculate the size of the sample (the calculation process of this embodiment is the same as that of embodiment 1), and obtain the resonance length L 2 =12.2mm. Similarly, after getting R 1 , R 2 , L 1 and L 2After obtaining the data, the size of the axial tension-compression sample is used as the boundary condition to m...

Embodiment 3

[0088] Mix Fe, Cu, Ni and Mo powders evenly, perform partial pre-diffusion treatment at 830°C, mix in 1% graphite and 0.1% lubricant, and press at room temperature with a pressing pressure of 500MPa. Afterwards, mesh belt sintering at 1120°C for 1 hour was carried out to obtain an iron-based warm-pressed Fe-Cu-Mn-C powder metallurgy material. In this example, the measured material density was 6.91g / cm 3 , the tensile strength is 510MPa, and the modulus of elasticity is 120GPa.

[0089] The shape of the preset axial tension and compression specimen is dumbbell-shaped, and R 1 =1.75mm, R 2 =5mm, L 1 =16mm, then calculate the size of the sample (the calculation process of this embodiment is the same as that of embodiment 1), and obtain the resonance length L 2 =11mm. Similarly, after getting R 1 , R 2 , L 1 and L 2 After obtaining the data, the size of the axial tension and compression sample was used as the boundary condition to model, and the Ansys finite element modal ...

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Abstract

The invention discloses a specimen size design method for ultrasonic and tension-compression fatigue tests of iron-based powder metallurgical materials. The specimen size design method comprises: firstly, measuring parameters of the iron-based powder metallurgical material, such as density, modulus of elasticity and the like; secondly, calculating theoretical sizes of specimens in the tension-compression fatigue tests; thirdly, calculating the response frequency which is needed upon material resonance by means of finite element analysis and regarding the theoretical sizes as boundary conditions; fourthly, fine-tuning the sizes of specimens when the response frequency is not matched with ultrasonic vibration frequency until the sizes of specimens are matched with the ultrasonic vibration frequency, so that the sizes of specimens can be used as experiment parameters. The specimen size design method can be used in various iron-based powder metallurgical materials and the testing frequency in ultrasonic fatigue tests can achieve 20 kHz, and accordingly, the feasibility and efficiency of fatigue tests can be improved.

Description

technical field [0001] The invention relates to the technical field of iron-based powder metallurgy material ultrasonic tension-compression fatigue experiment, in particular to a sample size design method for iron-based powder metallurgy material ultrasonic tension-compression fatigue experiment. Background technique [0002] Fatigue phenomenon is a phenomenon in which structural materials form cracks or further expand cracks until they are completely broken after a certain number of cycles under cyclic loading. For the convenience of analysis and research, fatigue is generally divided into high-cycle fatigue and low-cycle fatigue according to the number of failure cycles. The stress level of high cycle fatigue on parts and components is low, and the number of failure cycles is generally higher than 10 4 ~10 5 fatigue. The general traditional fatigue cycle is 10 7 In the following, high cycle fatigue can be divided into general high cycle fatigue and ultra high cycle fat...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 肖志瑜陆宇衡陈露付文超李元元
Owner SOUTH CHINA UNIV OF TECH
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