Search Results - "Topper, T.H."

A review of effective-strain based and multi R-ratio crack propagation models and a comparison of simulated results using the two approaches by Liang, W., Conle, F.A., Topper, T.H., Walbridge, S.

“…•Reversal-based damage count model.•Effective crack growth data.•Multi R-ratio model. Several theories and methodologies for running effective-strain and…”
Get full text

Mean stress effect in stress-life for hard steels by Gaia da Silva, D., Lockwood, J.T., Liang, W., Topper, T.H.

“…•A compressive mean stress rule for carburized steels.•This rule allows an increase in design stresses in compression.•For negative mean stresses fatigue life…”
Get full text

Threshold crack growth behavior of shear and tensile cracks by Bonnen, J.J.F., Topper, T.H.

“…► Shear/tensile plane cracking studied in SAE 1045 smooth specimen biaxial fatigue. ► Short/long crack models predicted specimen fatigue lives and endurance…”
Get full text

A model of crack opening stresses in variable amplitude loading using smooth specimen fatigue test data for three steels by El-Zeghayar, M., Topper, T.H., Soudki, K.A.

“…The rate of the recovery of the crack opening stress to its steady state level after the application of an underload is modeled by an exponential build-up…”
Get full text

The influence of biaxial strain ratio and strain range on crack growth mode and crack shape by Topper, T. H., Bonnen, J. J. F., Khalil, M., Varvani-Farahani, A.

“…Axial-torsion tests were used to determine and model the combinations of strain range and crack length at which the crack growth changed from a shear to a…”
Get full text

Prediction of crack-opening stress levels for 1045 as-received steel under service loading spectra by Khalil, M, Topper, T.H

“…A crack growth analysis based on a fracture mechanics approach was used to model the fatigue behavior of as-received 1045 steel specimens for three load…”
Get full text

Modeling crack closure and damage in variable amplitude fatigue using smooth specimen fatigue test data by El-Zeghayar, M., Topper, T.H., Conle, F.A., Bonnen, J.J.F.

“…Modeling changes in crack opening stress level and fatigue damage using data derived from periodic underload fatigue tests of smooth specimens. [Display…”
Get full text

Prediction and correlation of the average crack-opening stress with service load cycles by Khalil, M, Topper, T.H

“…The crack-opening stresses of a crack emanating from an edge notch in three different materials — a 2024-T351 aluminum alloy, a 1045 annealed steel, and a 1045…”
Get full text

Effective strain-fatigue life data for variable amplitude fatigue by TOPPER, T. H, LAM, T. S

Get full text

Changes in crack-opening stress after underloads and overloads in 2024-T351 aluminium alloy by Dabayeh, A.A., Topper, T.H.

“…A variable-amplitude block-loading history consisting of high, near-yield-stress, underloads or compression-tension overloads followed by constant-amplitude…”
Get full text

The influence of variable amplitude loading on crack closure and notch fatigue behaviour by MacDougall, Colin, Topper, T.H.

“…Smooth and notched 1045 steel specimens were tested under constant amplitude, R = −1 loading and under a variable amplitude load history consisting of periodic…”
Get full text

Fatigue of cast aluminium alloys under constant and variable-amplitude loading by Dabayeh, A.A., Xu, R.X., Du, B.P., Topper, T.H.

“…Three cast aluminium materials, Al 206, Al 319 and Al 390, were fatigue tested under constant- and variable-amplitude loading. A stress ratio of −1 was used…”
Get full text

The effect of bending overloads on torsional fatigue in normalized 1045 steel by Bonnen, J.J.F, Topper, T.H

“…Variable amplitude bending-torsion fatigue experiments were conducted on axle-shafts to determine the effects of overloads on the fatigue life of normalized…”
Get full text

The role of in-phase and out-of-phase overloads on the torsional fatigue of normalized SAE-1045 steel by Bonnen, J.J.F., Conle, F.A., Topper, T.H.

“…Several researchers have demonstrated that, under both uniaxial and in-phase biaxial loading, periodic overloads of yield stress level magnitude can be used to…”
Get full text

An experimental study of the effect of a flaw at a notch root on the fatigue life of cast Al 319 by Dabayeh, A.A, Berube, A.J, Topper, T.H

“…Smooth and notched specimens of a 319 cast aluminum alloy containing casting defects were fatigue tested in the as cast and hipped conditions. Hipping is a…”
Get full text

Derivation of crack closure and crack growth rate data from effective-strain fatigue life data for fracture mechanics fatigue life predictions by Lam, T.S., Topper, T.H., Conle, F.A.

“…This study deals with the behavior of short cracks growing out of notches. Three types of load histories are used: (a) a fully-reversed constant amplitude…”
Get full text

Crack growth and closure mechanisms of shear cracks under constant amplitude biaxial straining and periodic compressive overstraining in 1045 steel by Varvani-Farahani, A, Topper, T.H

“…Crack growth and roughness induced closure mechanisms of shear cracks under 180° out-of-phase strain histories having constant amplitude straining and periodic…”
Get full text

Notch fatigue behaviour as influenced by periodic overloads by DuQuesnay, D.L., MacDougall, C., Dabayeh, A., Topper, T.H.

“…The fatigue behaviour of centre-notched specimens of a 2024-T351 aluminium alloy is examined under a variable-amplitude loading sequence consisting of a…”
Get full text

The modified life law applied to SAE-1045 steel by DOWDELL, D.J, LEIPHOLZ, H.H.E, TOPPER, T.H

“…Miner's rule is seen to hold probabilistic significance. Erroneous predictions must therefore be caused by using inadequate data in the damage summation…”
Get full text