Ralph I. Stephens

Research Highlights

Joined the College of Engineering: 1965

Education:
Ph.D., Engineering Mechanics, University of Wisconsin
M.S., Theoretical and Applied Mechanics, University of Illinois, 1960
B.S., General Engineering, University of Illinois, 1957

Special Fields of Knowledge:
Fatigue; fracture mechanics; product liability

Present Research Interests:
Computational vehicular fatigue life predictions; fatigue crack growth of advanced titanium alloys; influence of high mean tensile stress

Selected Publications:
R.R. Stephens, R.I. Stephens, S.C. Berge, D.E. Lemm, and C.D. Glancy, "Effect of Transient Loads on Fatigue Crack Growth in Solution Annealed and Aged Ti-62222 at -54, 25, and 175oC," in Fatigue Testing and Analysis Under variable Amplitude Loading Conditions, edited by N. Ranganathan and P.C. McKeighan, ASTM STP, and Journal of ASTM International Vol. 1, No. 8, September 2004, pp. 1-17.

T.J. Pals and R.I. Stephens, "The Influence of High R Ratio on Mild and Sharp Notched and Unnotched Fatigue Behavior of 1045 Steel with three Different Heat Treatments," International Journal of Fatigue, Vol. 26, 2004, pp. 651-661.

K.M. Sigl, R.A. Hardin, R. I. Stephens, and C Beckermann "Fatigue of 8630 Cast Steel in the Presence of Porosity," International Journal of Cast Metals Research, Vol. 17, No. 3, 2004, pp. 130-146.

Karadag, M. and Stephens R.I. "The Influence of High R Ratio on Unnotched Fatigue Behavior of 1045 Steel with Three Different Heat Treatments," International Journal of Fatigue, Vol. 25, 2003, pp. 191-200.

Vantiger, T.R. and Stephens, R.I., "The Influence of High R Ratio on Notched Fatigue Behavior of 1045 Steel with Three Different Heat Treatments," International Journal of Fatigue, Vol.24, 2002, pp.1275-1284.

Active Scientific and Professional Society Memberships:
Sigma Xi; Pi Tau Sigma; American Society of Testing and Materials, E08 on Fatigue and Fracture; Society of Automotive Engineers Fatigue Design and Evaluation; Registered Professional Engineer, State of Iowa