Paper Title:
Determination of the Probabilistic Fatigue S-N Curves Including Super-Long Life Regime for a Railway Axle Steel
  Abstract

The structures of railway vehicles are required to service in super-long life regime. Determination of the probabilistic S-N curves including the regime should be a basic work to realize the real fatigue life prediction and reliability assessment. Based on the test results of Chinese railway LZ50 axle carbon steel, a statistical extrapolating method is proposed to determine the curves by applying the conventional test data in mid-long life regime. Some phenomena, i.e. the response of “fatigue limit”, a great of heat affecting using the high frequency ultrasonic fatigue test system, and the non-conservative test results using the conventional frequency tiny multi-specimen test system (machine C), are firstly mentioned in the existent super-long life researches. The too much conservative offers are also noted by the determinations of existent codes. To address the variable amplitude loads in production, the present method extrapolates continuously the curves from the mid- to super-long life regimes under the statistical controls of conventional fatigue limits. The practice for the present material indicates that the curves can well reflect the scattered data not only in mid-long life regime but also in super-long life regime. The non-conservative test results using machine C are also safely included by the curves.

  Info
Periodical
Advanced Materials Research (Volumes 44-46)
Edited by
Z.Y. Shen, M.N. James, W.D. Li, and Y.X. Zhao
Pages
57-64
DOI
10.4028/www.scientific.net/AMR.44-46.57
Citation
Y. X. Zhao, B. Yang, M. F. Feng, "Determination of the Probabilistic Fatigue S-N Curves Including Super-Long Life Regime for a Railway Axle Steel", Advanced Materials Research, Vols. 44-46, pp. 57-64, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Byeong Choon Goo
Abstract:A structural steel should satisfy various properties under varied conditions. Fatigue strength is one of them. When structural steels are...
593
Authors: Lei Chen, Yong Xiang Zhao, Yang Bing
Abstract:Fatigue S-N relations are investigated experimentally on the grade B cast steel for Chinese railway freight car bogie frames. Group test...
181
Authors: János Lukács
Abstract:There are different documents and standards containing fatigue crack propagation limit or design curves and rules for the prediction of crack...
49
Authors: H.Q. Liang, Yong Xiang Zhao, Y. Li
Abstract:Four grouped rectangle specimens with thirty four samples, plus eighteen samples for fatigue limits, are tested for constructing the fatigue...
352
Authors: Zsuzsanna Koncsik, János Lukács
Chapter 2: Plastic deformation
Abstract:Frequently, the cause of the failure of different structures or structural elements is the cyclic loading. Both fatigue design curves and...
135