scholarly journals Investigation into Multiaxial Character of Thermomechanical Fatigue Damage on High-Speed Railway Brake Disc

Vehicles ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 287-299
Author(s):  
Chun Lu ◽  
Jiliang Mo ◽  
Ruixue Sun ◽  
Yuanke Wu ◽  
Zhiyong Fan
Keyword(s):  
Fatigue Damage ◽  
High Speed ◽  
Thermomechanical Fatigue ◽  
Multiaxial Fatigue ◽  
Brake Disc ◽  
High Speed Railway ◽  
Loading Methods ◽  
Fatigue Evaluation ◽  
Temperature Strain ◽  
Total Damage

The multiaxial character of high-speed railway brake disc thermomechanical fatigue damage is studied in this work. Although the amplitudes and distributions of temperature, strain and stress are similar with uniform and rotating loading methods, the multiaxial behavior and out-of-phase failure status can only be revealed by the latter one. With the help of a multiaxial fatigue model, fatigue damage evaluation and fatigue life prediction are implemented, the contribution of a uniaxial fatigue parameter, multiaxial fatigue parameter and out-of-phase failure parameter to the total damage is discussed, and it is found that using the amplitude and distribution of temperature, stress and strain for fatigue evaluation will lead to an underestimation of brake disc thermomechanical fatigue damage. The results indicate that the brake disc thermomechanical fatigue damage belongs to a type of multiaxial fatigue. Using a uniaxial fatigue parameter causes around 14% underestimation of fatigue damage, while employing a multiaxial fatigue parameter without the consideration of out-of-phase failure will lead to an underestimation of about 5%. This work explains the importance of studying the thermomechanical fatigue damage of the brake disc from the perspective of multiaxial fatigue.

scholarly journals Multiaxial Fatigue Assessment for the Hanger Deck Connection of a High-Speed Steel-Truss-Arch Railway Bridge

2021 ◽  
Vol 11 (3) ◽  
pp. 1142
Author(s):  
Yongsheng Song ◽  
Youliang Ding ◽  
Fei Jiang ◽  
Zhiwen Wang ◽  
Jun Lu ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
High Speed ◽  
Element Model ◽  
Multiaxial Fatigue ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Steel Truss ◽  
Fatigue Evaluation

Steel-truss-arch bridges have been applied in high-speed railway bridges due to their excellent dynamic and static structural performance. Under the action of high-speed trains, the steel connections between hangers and decks suffer from repeated stresses, inducing potential fatigue problems or even fatigue failure. In this study, a multiaxial fatigue evaluation method was first created and established based on critical damage-plane methodology, following which the fatigue evaluation procedure was also created and recommended. The methodology was applied to real-life strain data from a high-speed railway bridge from which an assessment of fatigue damage and predicted fatigue life was estimated. The connection between the shortest hanger and deck on the downstream side was selected as the target due to its relatively high stress. A multiscale finite-element model of this bridge was created according to the design profile and monitoring results of traffic flow, where the finite-element model was calibrated and validated by comparing the calculation results with the monitoring data. Influence analysis was then carried out to investigate two factors—i.e., the total traffic flow and compositions of freight trains—having effects on the fatigue life of the steel connection. The results indicate that the applied multiaxial fatigue method is suitable for online fatigue evaluation of actual bridges. In addition, by using the multiaxial fatigue method, the fatigue-damage accumulation rate can be nearly 60 times that obtained by the uniaxial fatigue method. If freighting is taken into consideration, the fatigue damage will increase rapidly, and for the case 10% of proportion traffic as freighting, the actual fatigue life is estimated to be shorter than the design life.

Tension-shear multiaxial fatigue damage behavior of high-speed railway wheel rim steel

2020 ◽  
Vol 133 ◽  
pp. 105416 ◽  
Author(s):  
Qingsong Zhang ◽  
Isaac Toda-Caraballo ◽  
Qiuze Li ◽  
Junchen Han ◽  
Jing Han ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
High Speed ◽  
Multiaxial Fatigue ◽  
High Speed Railway ◽  
Damage Behavior ◽  
Railway Wheel ◽  
Wheel Rim

scholarly journals Thermomechanical Fatigue Behavior of Spray-Deposited SiCp/Al-Si Composite Applied in the High-Speed Railway Brake Disc

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Wei Li ◽  
Huitao Chen ◽  
Lu Zuo ◽  
Jian Chen ◽  
Dongliang Xu ◽  
...  
Keyword(s):  
High Speed ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Phase Interface ◽  
Thermomechanical Fatigue ◽  
Brake Disc ◽  
Dislocation Generation ◽  
Si Content ◽  
Al Matrix ◽  
Sic Particle

The thermomechanical fatigue (TMF) behaviors of spray-deposited SiCp-reinforced Al-Si alloy were investigated in terms of the size of Si particles and the Si content. Thermomechanical fatigue experiments were conducted in the temperature range of 150-400°C. The cyclic response behavior indicated that the continuous cyclic softening was exhibited for all materials, and the increase in SiC particles size and Si content aggravated the softening degree, which was attributed to dislocation generation due to differential thermal contraction at the Al matrix/Si phase interface or Al matrix/SiC particle interface. Meanwhile, the TMF life and stress amplitude of SiCp/Al-7Si composites were greater than those of Al-7Si alloy, and increased with the increasing SiC particle size, which was associated with “load sharing” of the direct strengthening mechanism. The stress amplitude of 4.5μmSiCp/Al-Si composite increased as the Si content increased; however, the influence of Si content on the TMF life was not so significant. The TMF failure mechanism revealed that the crack mainly initiated at the agglomeration of small-particulate SiC and the breakage of large-particulate SiC, and the broken primary Si and the exfoliated eutectic Si accelerated the crack propagation.

Review of the fatigue damage tolerance of high-speed railway axles in Japan

2011 ◽  
Vol 78 (5) ◽  
pp. 810-825 ◽  
Author(s):  
Taizo Makino ◽  
Takanori Kato ◽  
Kenji Hirakawa
Keyword(s):  
Fatigue Damage ◽  
High Speed ◽  
Damage Tolerance ◽  
High Speed Railway

On the fatigue design method for high-speed railway axles

2001 ◽  
Vol 215 (2) ◽  
pp. 73-82 ◽  
Author(s):  
K Hirakawa ◽  
M Kubota
Keyword(s):  
Fatigue Strength ◽  
High Speed ◽  
Fatigue Cracks ◽  
Fretting Fatigue ◽  
Brake Disc ◽  
Metal Fatigue ◽  
High Speed Railway ◽  
Fatigue Design ◽  
Railway Axle ◽  
The Press

Fatigue failure of the railway axle, which has been a source of difficulty for engineers since railroad service started in the early part of the nineteenth century, was the beginning of the study of metal fatigue. In order to maintain the safety of a high-speed railway system, a large number of investigations and experiments have been carried out by outstanding researchers ever since, and many improvements have been made in the material, manufacturing, heat treatment and design methods. In comparing Japan and Europe on the fatigue design philosophy of the high-speed railway axle, it is recognized that there is a difference between the Japanese Shinkansen and the European TGV and ICE. The critical parts for fatigue strength are the press-fitted parts which suffer from fretting fatigue damage, such as the wheel seat, gear seat and brake disc seat. In Europe, the larger diameter of the press-fitted part makes the fillet the critical part. In Japan, however, the fatigue strength of the press-fitted part is increased by an induction hardening method. Also, a stress-relief groove is made at the closely press-fitted part of the axle. For several years, no fretting fatigue cracks in Shinkansen axles have been detected by magnetic particle inspection. It is noted that improvements over many years have been successful in achieving the safety of high-speed railway axles. These problems will be studied in this paper.

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