Full Content is available to subscribers

Subscribe/Learn More  >

Experimental Study on High Frequency Effect on Fatigue Strength of Welded Joints by Using Plate-Bending-Vibration Type Fatigue Testing Machines

[+] Author Affiliations
Naoki Osawa, Junji Sawamura

Osaka University, Suita, Osaka, Japan

Tetsuya Nakamura

Japan Marine United Co., Tsu, Mie, Japan

Norio Yamamoto

Nippon Kaiji Kyokai, Chiba, Chiba, Japan

Paper No. OMAE2014-23856, pp. V04BT02A003; 8 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4B: Structures, Safety and Reliability
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4543-1
  • Copyright © 2014 by ASME


Fatigue strength of out-of-plane gusset welded joints subject to springing and whipping superimposed wave loadings is examined by using Plate-Bending-Vibration (PBV) type fatigue testing machines developed in the previous reports [Osawa, N. et al. (2013) Proc. OMAE2013, Paper OMAE2013-11582, Osawa N. et al. (2013) Proc. PRADS2013, pp.550–556]. Springing vibration is superimposed by attaching an additional vibrator to the test specimen, and whipping vibration is superimposed by intermittent hammering. ‘Enlargement counting’ method, in which the stress history is approximated by a waveform with the low frequency component’s period and the enlarged total amplitude, is proposed. Fatigue damages and equivalent stress ranges are calculated by enlargement and rainflow cycle counting methods. It is found that the fatigue life under high frequency superimposed loads can be predicted with acceptable accuracy by the modified Miner rule when enlargement or rainflow stress counting is performed and the S-N curve is modified so that it fits the equivalent stress range’s Ps = 50% curve. Based on test results, a simplified assessment method for high frequency effect on fatigue strength of ship’s welded joints is proposed. The validity of the proposed assessment method should be further examined by carrying out fatigue tests with realistic stress histories which emulate intermittent occurrence of springing and whipping in ship structure.

Copyright © 2014 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In