High-pressure vessels are autofrettaged to introduce favorable, compressive, residual stresses around their inner diameters. The efficacy of autofrettage is limited by a phenomenon called the Bauschinger effect, which describes the early onset of nonlinearity during unloading in a material that has previously been subjected to initial deformation. The degree of prestressing achieved determines the fatigue life of the vessel, hence, high fidelity prediction of the stress field developed is essential for accurate prediction of fatigue life. This requires precise representation of material behavior within the autofrettage model used. This paper describes the adaption and development of USERMAT, a user programmable feature within ANSYS (ANSYS Finite Element Program, ANSYS, Inc., Southpointe, 275 Technology Drive, Canonsburg, PA), to create a framework to represent realistic behavior of candidate gun steels. A number of materials including A723 were modeled to investigate and validate the framework. A723 was then used in simulations of both a uni-axial test and hydraulic autofrettage. These results are compared with spreadsheet data from the material-fit equations and equivalent results from the Hencky program, respectively. Close agreement was observed between the results in both cases, indicating the model is an effective means of representing the considerable variation in behavior between loading and unloading in candidate steels.
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e-mail: m.c.gibson@cranfield.ac.uk
e-mail: parker.ETR@tiscali.co.uk
e-mail: a.hameed@cranfield.ac.uk
e-mail: j.g.hetherington@cranfield.ac.uk
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October 2012
Design And Analysis
Implementing Realistic, Nonlinear, Material Stress–Strain Behavior in ANSYS for the Autofrettage of Thick-Walled Cylinders
Michael C. Gibson,
Michael C. Gibson
Department of Informatics and Systems Engineering, Cranfield University,
e-mail: m.c.gibson@cranfield.ac.uk
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
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Anthony P. Parker,
Anthony P. Parker
Department of Engineering and Applied Science, Cranfield University,
e-mail: parker.ETR@tiscali.co.uk
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
Search for other works by this author on:
Amer Hameed,
Amer Hameed
Department of Engineering and Applied Science, Cranfield University,
e-mail: a.hameed@cranfield.ac.uk
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
Search for other works by this author on:
John G. Hetherington
John G. Hetherington
Department of Engineering and Applied Science, Cranfield University,
e-mail: j.g.hetherington@cranfield.ac.uk
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
Search for other works by this author on:
Michael C. Gibson
Department of Informatics and Systems Engineering, Cranfield University,
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
e-mail: m.c.gibson@cranfield.ac.uk
Anthony P. Parker
Department of Engineering and Applied Science, Cranfield University,
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
e-mail: parker.ETR@tiscali.co.uk
Amer Hameed
Department of Engineering and Applied Science, Cranfield University,
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
e-mail: a.hameed@cranfield.ac.uk
John G. Hetherington
Department of Engineering and Applied Science, Cranfield University,
Defence Academy College of Management and Technology
, Swindon, SN6 8LA, UK
e-mail: j.g.hetherington@cranfield.ac.uk
J. Pressure Vessel Technol. Oct 2012, 134(5): 051202 (7 pages)
Published Online: August 27, 2012
Article history
Received:
November 16, 2011
Revised:
March 19, 2012
Published:
August 27, 2012
Citation
Gibson, M. C., Parker, A. P., Hameed, A., and Hetherington, J. G. (August 27, 2012). "Implementing Realistic, Nonlinear, Material Stress–Strain Behavior in ANSYS for the Autofrettage of Thick-Walled Cylinders." ASME. J. Pressure Vessel Technol. October 2012; 134(5): 051202. https://doi.org/10.1115/1.4006909
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