Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 2013-2020.doi: 10.13229/j.cnki.jdxbgxb20200633

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Development about three⁃point bending fatigue experiment machine that can test six specimens at same time

Qing-guang YAN1(),Zi-xuan FENG1,Xiang-ji LI2,Ying-wei WANG1   

  1. 1.College of Material Science and Engineering，Jilin University，Changchun 130022，China
    2.Roll Forging Institute，Jilin University，Changchun 130022，China
  • Received:2020-08-20 Online:2021-11-01 Published:2021-11-15

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Abstract:

It is inefficient to test only one specimen using traditional bending fatigue experiment machine. A new bending fatigue experiment machine is proposed, which can test six specimens simultenously. The machine is used to test the fatigue life of H13 steel. Firstly, pressure load is applied to six specimens. Then, the force loaded on the specimens is measured by force sensors. The single load is cancelled immediately by the control system if one of the six specimens’ load is bigger than allowable load. Moreover, the fatigue experiment of other specimens is still proceeding. Finally, the bending fatigue experiment is finished as all specimens engender cracks and break due to fatigue. The fatigue life of the specimens is calculated by analyzing the experiment data. The efficiency of bending fatigue experiment is significantly increased via the test of six specimens simultenously.

Key words: material science and engineering, bending fatigue experiment, more specimens in once experiment, ISO-stress, three points bending, H13 steel, upper monitor

CLC Number: 

  • TG76

Fig.1

Die that is made from H13 steel"

Fig.2

Cracks that affect the performanceof product in the die"

Fig.3

Schematic diagram of a non-standardbending fatigue test device"

Fig.4

Block diagram of the control systemin the fatigue experiment machine"

Fig.5

Cylindrical specimen for metalbending fatigue test"

Fig.6

Working diagram of three-pointbending fatigue test"

Fig.7

Axonometric drawing and front view of three-points bending fatigue machinethat can test six specimens at the same time"

Fig.8

Cutaway view of a three-points bending fatigue machine′s pressing load unit that can test six specimens at the same time"

Fig.9

Flow chart of a three-points bending fatiguemachine that can test six specimensat the same time"

Fig.10

Block diagram of controller system"

Table 1

Index of controller"

技术要求具体指标
测量压力/N0~100
ADC位数/位12
压力信号分辨能力/N0.1
放大器放大倍数/dB30
线性度/%F.S0.1
重复性/%F.S0.1
供电方式锂电池供电
供电电压/V11~16
传感器感应信号频率/Hz0~200
传感器使用温度/°C-20~70

Fig.11

Program flow diagram"

Fig.12

Overall figure of the system of controller"

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