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Research Papers: Applications

Effect of Temperature on Mechanical Properties and Torsional Friction Behaviors of Bogie Center Plate

[+] Author and Article Information
Shibo Wang

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: wangshb@cumt.edu.cn

Chengchao Niu

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: niuchengchao66@163.com

Bo Cao

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: shanxi2008caobo@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 10, 2015; final manuscript received July 20, 2015; published online August 31, 2015. Assoc. Editor: Dae-Eun Kim.

J. Tribol 138(1), 011104 (Aug 31, 2015) (7 pages) Paper No: TRIB-15-1075; doi: 10.1115/1.4031137 History: Received March 10, 2015; Revised July 20, 2015

In order to simulating the torsional friction of the center plate during the railcar body traveling on different railway curves at different environmental temperatures, the torsional friction behavior of monomer casting (MC) nylon composites which was used to make center plate, at temperatures of −25 °C to 50 °C was studied. With increasing temperature, the mechanical properties of nylon composites were weakened, whereas the visco-elastic property was boosted. Under torsional angle of 1.8 deg and 0.96 deg, all the torque–angular displacement (T–θ) curves exhibited the quasi-parallelogramic shape at various temperatures. When the temperature was higher than 25 °C under 0.42 deg, the shape transformed from elliptic to parallelogrammic. This indicated that the torsional regime changed from a partial slip to a gross slip. With increasing temperature, the torsional torque decreased and the wear mass loss increased because of weakened mechanical properties. The wear mechanism changed from slight plastic flow at low temperature to serious adhesive and three-body abrasion wear at high temperature.

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Figures

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Fig. 1

Schematic diagram of the structure of plane-on-plane torsional friction tester

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Fig. 2

The contact schematic of the torsional friction pair

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Fig. 3

Tensile strain–stress curves of MC nylon composite at different temperatures

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Fig. 4

SEM photographs of tensile fracture surface of MC nylon composites at different temperatures

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Fig. 5

Variation of storage modulus, loss modulus, and loss tangent of MC nylon composite against temperature (with test frequency of 1 Hz)

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Fig. 6

T–θ curves of MC nylon composite at various temperatures and angular displacement amplitudes

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Fig. 7

Representation of the T–θ curves and the mechanical energy during a torsional cycle [24]

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Fig. 8

Effect of temperature on torsional torque of MC nylon composite during test at various angular

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Fig. 9

Variation of wear rate of MC nylon composite against temperature under different angular displacement amplitudes

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Fig. 10

SEM photographs of MC nylon composite worn surface at various temperatures and angular displacement amplitude

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