Paper Title:
Fatigue S-N Relations of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
  Abstract

Fatigue S-N relations are investigated experimentally on the grade B cast steel for Chinese railway freight car bogie frames. Group test method was employed. Results reveal that the fatigue cracks were initiated from the material cast shrinking cavities with hot ties. Distinct fatigue striations, river-like flowers, and second cracks appeared on the fracture surface in perpendicular to the fatigue crack path. Lots of dimples in the transient fracture district indicate that present material is ductile. Considering both the scattered S-N relations and no fatigue limits under variable loads, the S-N relations are measured probabilistically in terms of continuous declined probabilistic S-N curves including super-long life regime (SLLR) of >107 cycles. Affordable novel approach, i.e. concurrent probability extrapolation method, was applied. The test S-N data in mid-long life regime (MLLR) and conventional fatigue limits are used. The curves are established by extrapolating the conventional S-N curves crossing the fatigue limits, in a concurrent probability manner, into the SLLR. Appropriate measurements have been given for the test data of the present material.

  Info
Periodical
Advanced Materials Research (Volumes 118-120)
Edited by
L.Y. Xie, M.N. James, Y.X. Zhao and W.X. Qian
Pages
181-185
DOI
10.4028/www.scientific.net/AMR.118-120.181
Citation
L. Chen, Y. X. Zhao, Y. Bing, "Fatigue S-N Relations of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames", Advanced Materials Research, Vols. 118-120, pp. 181-185, 2010
Online since
June 2010
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: 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: Zhi Fang Zhao, Qiu Yu Wang, Zhi Hua Yang, Yang Yang
Chapter 1: Civil Engineering
Abstract:The softening curves of four groups specimens with different sizes were obtained by inverse analysis based on the fictitious crack...
64
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