This paper describes a new linear matching method (LMM) technique for the direct evaluation of the ratchet limit of a structure subjected to a general cyclic load condition, which can be decomposed into cyclic and constant components. The cyclic load history considered in this paper contains multiload extremes to include most complicated practical applications. The numerical procedure uses the LMM state-of-the-art numerical technique to obtain a stable cyclic state of component, followed by a LMM shakedown analysis, to calculate the maximum constant load, i.e., the ratchet limit, which indicates the load carrying capacity of the structure subjected to a cyclic load condition to withstand an additional constant load. This approach is particularly useful in conjunction with the evaluation of the stable cyclic response, which produces the cyclic stresses, residual stresses, and plastic strain ranges for the low cycle fatigue assessment. A benchmark example of a holed plate under the combined action of cyclic thermal load and constant mechanical load is presented to verify the applicability of the new ratchet limit method through a comparison with published results by a simplified method assuming a cyclic load with two extremes. To demonstrate the efficiency and effectiveness of the method for a complicated cyclic load condition with multiload extremes, a composite thick cylinder with a radial opening subjected to cyclic thermal loads and a constant internal pressure is analyzed using the proposed ratchet limit method. Further verification by the ABAQUS step-by-step inelastic analysis demonstrates that the proposed new method provides a general-purpose technique for the evaluation of the ratchet limit and has both the advantages of programming methods and the capacity to be implemented easily within a commercial finite element code Abaqus.
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e-mail: haofeng.chen@strath.ac.uk
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August 2010
Research Papers
A Direct Method on the Evaluation of Ratchet Limit
Haofeng Chen,
Haofeng Chen
Department of Mechanical Engineering,
e-mail: haofeng.chen@strath.ac.uk
University of Strathclyde
, Glasgow G1 1XJ, UK
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Alan R. S. Ponter
Alan R. S. Ponter
Department of Engineering,
University of Leicester
, Leicester LE1 7RH, UK
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Haofeng Chen
Department of Mechanical Engineering,
University of Strathclyde
, Glasgow G1 1XJ, UKe-mail: haofeng.chen@strath.ac.uk
Alan R. S. Ponter
Department of Engineering,
University of Leicester
, Leicester LE1 7RH, UKJ. Pressure Vessel Technol. Aug 2010, 132(4): 041202 (8 pages)
Published Online: July 23, 2010
Article history
Received:
January 4, 2010
Revised:
March 18, 2010
Online:
July 23, 2010
Published:
July 23, 2010
Citation
Chen, H., and Ponter, A. R. S. (July 23, 2010). "A Direct Method on the Evaluation of Ratchet Limit." ASME. J. Pressure Vessel Technol. August 2010; 132(4): 041202. https://doi.org/10.1115/1.4001524
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