ISSN: 1546-962X
Published Online: 17 September 2009
Page Count: 13

Elastic-Plastic Stress Analysis of Cold-Worked Pin-Loaded Holes

Ismonov, S.
Dept. of Mechanical Engineering, Mississippi State Univ.,MS,

Daniewicz, S. R.
Dept. of Mechanical Engineering, Mississippi State Univ.,MS,

Newman, J. C.
Dept. of Aerospace Engineering, Mississippi State Univ.,MS,

(Received 12 May 2009; accepted 19 August 2009)

Abstract

A detailed two-dimensional, elastic-plastic finite element analysis of a pin-loaded hole was conducted. A thin rectangular aluminum alloy sheet (7075-T6) with a circular hole was considered under plane stress conditions. The hole was loaded purely by a rigid pin to different load magnitudes. Appropriate contact elements were used at the pin-hole interface to transfer the traction loads from one surface to another. Material nonlinearities for the sheet and friction were included in the analyses. Radial and hoop stress solutions along the pin-hole interface were compared in elastically and plastically loaded holes. The influence of friction on the stress results was studied. The locations and magnitudes of the peak hoop stresses were determined. Lastly, an initial residual field was introduced around the hole by a cold expansion simulation before a subsequent pin-loading analysis. Because the cold expansion process involves some reverse yielding, both isotropic and kinematic material hardening models were considered.

Keywords:
finite element analysis, pin-loaded holes, friction, isotropic and kinematic hardening, contact stresses, residual stresses

Paper ID: JAI102503
DOI: 10.1520/JAI102503
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