A model for predicting J-integral of surface cracks in round bars under combined mode I loading

Ismail, Al Emran; Noor, Fazimah Mat; Mohamad, Zaleha; Madlan, Mohd Amran; Zulafif, M.; Ibrahim, Mustaffa; Hassan, Mohd Fahrul; Ariffin, Arihasnida; Yunos, Muhamad Zaini

doi:10.1088/1757-899x/226/1/012015

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…Then, the fracture response is provoked. [20][21][22] In the actual operation of the contact wire, the tension at both ends of the contact wire can be increased scientifically, which can effectively reduce the fluctuation amplitude of the contact force between the pantograph and the catenary system. Through optimizing the relationship between the pantograph and the catenary system, and further reducing the failure caused by the fatigue fracture of the dropper, it can meet the operation safety of the electrified train.…”

Section: Discussionmentioning

confidence: 99%

Numerical study of contact wire tension affecting dropper stress of a catenary system

Guo

Chen

2021

Advances in Mechanical Engineering

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Dropper is the key component of in a catenary system and it is prone to fatigue fracture. Dropper stress directly affects the operation safety of high-speed railway. In this paper, a span of dropper in a catenary system is modeled to investigate the effects of contact wire tension on dropper stress. The response equation of contact wire and the theoretical equation of dropper stress are deduced. The initial and boundary conditions of each dropper are determined, and then the stress of each dropper is calculated by the finite difference method using a MATLAB program. The results show that the stress amplitude and the maximum tensile stress of the dropper decrease significantly with the increase of contact wire tension. When the tension is low, the stress changes of dropper near the load location experience three stages: instant rebound, attenuated vibration, and bending compression. However, the attenuation vibration stage disappears when the tension is increased to a certain extent. Therefore, the control of the vibration response of the contact wire can effectively reduce the stress amplitude and the maximum tensile stress of the dropper, so as to improve the working reliability of the dropper.

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Section: Discussionmentioning

confidence: 99%

Numerical study of contact wire tension affecting dropper stress of a catenary system

Guo

Chen

2021

Advances in Mechanical Engineering

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“…The FCG process is often classified into three stages, namely, the slow growing region (stage I), the stable growing region (stage II), and the rapidly growing region (stage III). Other researcher found that the deeper the cracks with shorter crack width are accomplished to reduce the fatigue crack growth rate [17]. Fig.…”

Section: Fatigue Crack Growth Under Cyclic Loadingmentioning

confidence: 96%

Entropy-Based Approach for Fatigue Crack Growth Rate of Dual-Phase Steel

Idris

Abdullah

Thamburaja

et al. 2018

IJIE

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This paper presents an entropy-based approach for the fatigue crack growth of dual-phase steel under a constant amplitude loading. According to the degradation-entropy generation theorem, the degradation coefficient can be derived from the correlations of entropy and crack propagation. The temperature evolutions induced for the duration of the fatigue crack growth tests on the as-received and dual-phase steel till it failed were measured to ensure their validity. The results of the present model and the calculated Paris-regime crack growth data were analysed to reach the conclusion that the temperature at the surface of a specimen during a fatigue crack growth test can be used for the assessment of fatigue crack growth by the intensity of the degradation coefficient. The predicted results showed that the present model could accurately predict the fatigue crack growth rate of dual-phase steel with a regression value (R 2) of 0.9952.

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“…However, the study considered the half pin-bone interaction in 2-dimensional only. FE analysis are conducted in ANSYS Mechanical APDL and the meshing process is based on [5]. The geometries of both TC and TTT of the half pins were taken from the actual Synthes orthopedic pins.…”

Section: Finite Element Modelingmentioning

confidence: 99%