Stress concentration factors of stepped structures and shouldered shafts under combined loading

The purpose of this research is to investigate finite element analysis results of two- and three- dimensional models of stepped structures and shouldered shafts with varying fillets and varying size ratios. Combined loading conditions were placed on the models to observe how the loading conditions effect the stress concentration factors. The results from the finite element analyses were compared to Peterson’s photoelastically determined stress concentration factors. The results were within five percent of Peterson’s results. For the two- dimensional case, axial and bending loads were applied separately and then superpositioned to evaluate the effect combined loading has on stepped structures. The finite element analysis results from the combined loading agrees to within four percent of the results obtained by calculating the maximum stress at the fillet using Peterson’s stress concentration factors applied to both axial and bending stresses. For the three- dimensional case, bending and torsion loads were applied separately and then superpositioned to evaluate the effect combined loading would have on shouldered shafts. It was determined for pure bending and pure torsion the finite element analyses are comparable to within five percent of Peterson’s reported stress concentration factors. But under combined loading conditions, the finite element analysis reports a more accurate solution than using Peterson’s stress concentration factors, because Peterson doesn't take into account the hoop stress acting on the shaft.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Mechanical Engineering

Department dc:contributor.department

Mechanical Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1995

Author dc:creator

• Russell, Larry C.

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-01102009-063934

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/40586