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| Fracture Analysis of Balancing Elbow in Chassis System of an Armored Vehicle |
| Received:September 22, 2023 Revised:October 31, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.11.003 |
| KeyWord:balance elbow fracture corrosion fatigue corrosion protection internal spline heat treatment |
| Author | Institution |
| CHEN Chao-bo |
The Sixth Military Representative Office of the Military Representative Bureau of the Army Armament Department in Chongqing, Chongqing , China |
| LIU Xiu-ru |
The Sixth Military Representative Office of the Military Representative Bureau of the Army Armament Department in Chongqing, Chongqing , China |
| MENG Yong |
The Sixth Military Representative Office of the Military Representative Bureau of the Army Armament Department in Chongqing, Chongqing , China |
| CHEN Shi-yong |
The Sixth Military Representative Office of the Military Representative Bureau of the Army Armament Department in Chongqing, Chongqing , China |
| DING Xing-xing |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to explore the reasons for the breakage of the balance elbow, eliminate hidden troubles and prevent similar problems from occurring. A camera, a scanning electron microscope, a metallographic microscope, a hardness tester, an inductively coupled plasma atomic emission spectrometers were used to characterize and analyze the micromorphology, microstructure, hardness, chemical composition of the faulty balance elbow parts; ANSYS finite element software was used to conduct stress analysis on the internal spline, and the dimensions of the twice quenched specimen were measured. The results showed that the crack source fracture of the right 4th balanced elbow was a mixed fracture of tearing and inter-granularity, and the core of the fracture was a cleavage fracture; While the inner surface quenching layer of the fracture of the right 2nd balanced elbow was a mixed fracture of intergranular and dimples, and the core was a ductile fracture. There was no significant change in the microstructure and chemical composition of the faulty part, except that the surface hardness value decreased by 7% to 9% compared with that before the experiment. The balance elbow fracture was due to the shrinkage deformation of the internal spline after secondary high-frequency quenching. The combined action of corrosive media and alternating loads caused stress concentration in the arc part of the tooth root to form cracks. In the later cycle, cracks continued to expand under the action of stress, leading to fatigue fracture. Finally, suggestions for improvements are supplied to ensure equipment quality. The corrosion control should be strengthened by selecting materials with good corrosion resistance, surface protection treatment, and controlling the humidity and temperature of the vehicle environment. By increasing the use of electric pulses and other methods to modify the deformed spline teeth, the size range can be strictly controlled to avoid excessive tensile stress. |
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