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Study of Fatigue Crack Growth Rate of AA6061 at Different Stress Ratios

  • Rajesh P. Verma
  • K. N. Pandey
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

In the present work, fatigue crack growth behaviors of AA6061 are studied at different stress ratios, R = 0.1, 0.5 and 0.9. The fatigue crack growth rate and stress intensity factors at steady-state regime were determined by fatigue test on compact tension specimens. Fatigue tests were performed according to ASTM standards using Biss 25-kN, servo-hydraulic testing machine with graphic interface and auto-calibration. Lower fatigue crack growth rate as well as a higher fatigue crack growth threshold for stress ratio, R = 0.1, was observed and compared to R = 0.5 and 0.9. The dependency of crack growth on stress ratio is also modeled based on Walker approach, and Walker exponent was identified to model the dependency of fatigue crack growth rate of AA6061-T6 on stress ratios. The mathematical model developed shows 95% adj R square, which is acceptable.

Keywords

Aluminum alloy AA6061 T6 Fatigue crack growth rate Stress intensity factor Stress ratio Modeling 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringGraphic Era University (GEU)DehradunIndia
  2. 2.Department of Mechanical EngineeringMotilal Nehru National Institute of Technology (MNNIT)AllahabadIndia

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