Investigation of service failures in automobile shock absorbers

Gallardo, José M.; Soria, L.; Herrera, E. J.

doi:10.1016/j.engfailanal.2006.02.006

Cited by 16 publications

(7 citation statements)

References 1 publication

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“…Therefore, the micro-hardness measurements are also in agreement with the order of magnitude of the rounded structure average (see Table 2), for small sizes of the rounded structure the micro-hardness was high. For the micro-hardness measures made at the LSR-treated region in different laser beam scanning, the result is presented at Figure 6c at untreated region and at Figure 6c the micro-hardness result is presented, where the micro-hardness in this region is almost half of the treated region, thus the treated region has a better performance than the untreated region [21], showed more detail of the technique. Figure 1b).…”

Section: Micro-hardness (Hv) Measurements In Different Laser Beam Scamentioning

confidence: 98%

Study Experimental and Numerical Simulations of the Micro-hardness Tests in AL-FE alloy in Different Laser Beam Scanning

Pariona

2019

ing.cienc

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In the Al-2.0 wt.% Fe alloy the laser surface remelting (LSR) treatment was executed to investigate the treated and untreated layers areas, at different laser beam scanning, among them, 80, 100 and 120 mm/s, to respect, was presented and discussed about microstructural characteristics using the FEG and EDS techniques, and numerical experiments of pyramidal indentations of the LSR-treated systems were conducted using the FEM method. In the sample-treated cross-sectional area, the microstructure presented a columnar growth characteristics, a lot of nano-porosities and large size of the molten pool geometry in low laser beam scanning, however, in high laser beam scanning, the microstructure consisted of a cellular arrangement or fine-grained microstructure, the nanoporosities concentration and the molten pool geometry are slightly decreased. Besides, the micro-hardness in the LSR-treated area increased slightly as a function of increase of the laser beam scanning, but, the micro-hardness was much 1 Universidade Estadual de Ponta Grossa, mmpariona@uepg.br, ORCID:0000-0002-1104-0249, Paraná, Brasil. Universidad EAFIT 57|Study Experimental and Numerical Simulations of the Micro-Hardness Tests in Al-Fe Alloy in Different Laser Beam Scanning higher than the untreated sample. Meanwhile, modeling of indentation on COMSOL of the LSR-treatment by finite element method of the microhardness was successfully calculated. Therefore, a good agreement was found between experimental and simulated data.

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Section: Micro-hardness (Hv) Measurements In Different Laser Beam Scamentioning

confidence: 98%

Study Experimental and Numerical Simulations of the Micro-hardness Tests in AL-FE alloy in Different Laser Beam Scanning

Pariona

2019

ing.cienc

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“…It is inferred from the 'Effect of temperature on hydraulic damper life' section that the sensitive parameter M is linearly degraded, so the sensitive parameter M obtained at different frequencies in the static test at T 1 temperature is linearly fitted. The fitting result is processed according to equation 3, and weighted according to the goodness of fit r 2 which can be calculated by equation (5). The partial fitting results are shown in Figure 5(a) and (b).…”

Section: Analysis Of Factors Affecting the Anti-yaw Dampermentioning

confidence: 99%

“…It is concluded that the greater the loading velocity of the damper, the more obvious the damping force and hysteresis produced. In the study of shock absorber failure, many researchers 4,5 have studied the failure reasons of specific different shock absorbers. Through the analysis of the results of metallographic analysis, the corresponding failure reasons and improved methods were obtained.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the service life of railway hydraulic dampers considering temperature and loading

Song

Zeng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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Hydraulic dampers are mainly used to maintain high-speed trains in a stable state when running at high speed. In this paper, an equivalent method for the lifetime of dampers is proposed to establish the relationship between the long-term loading test and the mileage in service condition. The performance degradation of the damper at different temperatures is calculated using the long-term loading test carried out under the corresponding temperature conditions. Arrhenius model is applied to convert the degradation under different temperatures, and the sensitive parameter is selected for the conversion of the damper’s performance degradation under different temperatures. An energy method is proposed to solve the problem of the damper lifetime under different loads, so as to achieve the equivalent of the damper between the long-term load test and the mileage in service condition. Finally, taking the anti-yaw damper of a certain type of high-speed train in China as the research object, the lifetime equivalent method proposed in this paper is applied and the result showed that the anti-yaw damper had remaining service life after 2.4 million kilometers of service.

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“…Service failures of an automobile shock absorber [8] with welding imperfections were investigated, and the fretting fatigue failure and crack under cyclic loading of the shim valve of an automotive shock absorber [9] was also studied. However, research concerning failures of railway hydraulic damper structures and the reasons why railway hydraulic dampers are still subject to premature failures under actual in-service load conditions, need further investigation.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Analysis of A Railway Hydraulic Damper with Welding Imperfections under Actual In-service Load Conditions

Wang¹,

Huang²,

Du³

et al. 2019

Proceedings of the 2019 International Conference on Modeling, Analysis, Simulation Technologies and Applications (MASTA 2019)

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Fatigue analysis of a railway vehicle axle-box hydraulic damper was carried out in this study. The damping force profiles under nominal and actual in-service load conditions were simulated, and the corresponding load spectra were obtained using the rain-flow cycle counting approach. Further fatigue analyses of the hydraulic damper under nominal and actual in-service load spectra and with welding imperfections were conducted. Results demonstrate that the maximum local stress of the damper would increase and fatigue life would be remarkably reduced when using the actual in-service load spectra. If the damper also has multiple welding imperfections, such as with porosities and misalignment of parts, the damper would be readily subject to premature failures. For this reason, many current high-speed rail hydraulic dampers are still subject to premature failures despite being designed to nominal load cases. Thus, a nonlinear in-service damper model and the actual in-service load spectra should be used in further damper structural development, the results obtained in this study could also be instructive in improving damper structure welding technique and inspection.

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Investigation of service failures in automobile shock absorbers

Cited by 16 publications

References 1 publication

Study Experimental and Numerical Simulations of the Micro-hardness Tests in AL-FE alloy in Different Laser Beam Scanning

Study Experimental and Numerical Simulations of the Micro-hardness Tests in AL-FE alloy in Different Laser Beam Scanning

Analysis of the service life of railway hydraulic dampers considering temperature and loading

Fatigue Analysis of A Railway Hydraulic Damper with Welding Imperfections under Actual In-service Load Conditions

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