Method of Detecting Unexpected Load Leading to Crack Growth Acceleration

Abstract:

The crack growth can accelerate after applying unexpected overload or underload during usual operation of machine structure. An acceleration or deceleration of the crack growth was observed depending on the experimental conditions. In the present study, a method of detecting the application of an unexpected hazardous load, that is high levels of overload or underload, was investigated. It is expected that the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing daily inspection. In the present study by using center-crack specimens, a simple method of detecting application of overload or underload was investigated by using strain information.

• Periodical: Key Engineering Materials (Volume 775)
• Pages: 517-523
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.775.517
• Online since: August 2018
• Authors: S.M. Moshiar Rahman*, Md. Shafiul Ferdous, Chobin Makabe
• Keywords: Acceleration, Detection of Hazardous Load, Fatigue Crack Growth, Waveform of Strain Function

References

[1] S.M. Moshiar Rahman, Md. Shafiul Ferdous, Konosuke Tada, Chobin Makabe, A Method for Detecting an Unexpected Application of a Hazardous Load During Operation, Advances in Materials Science and Applications, 2017, PP 9-16.

DOI: 10.5963/amsa0601002

[2] M. Kikukawa, M. Jono, K. Takaka, M. Takatani, Measurement of Fatigue Crack Propagation and Crack Closure at Low Stress Intensity Level by Unloading Elastic Compliance Method, Journal of the Society of Materials Science Japan, 1976, pp.899-903.

[3] C. Makabe, A. Purnowidodo, T. Sueyoshi, T. Utsunomiya, Detecting Overload from Strain Information during Fatigue Crack Propagation under Negative Stress Ratio,, Testing and Evaluation, 2004, pp.56-61.

DOI: 10.1520/jte11853