scholarly journals Special Issue on Fracture Mechanics. Initiation and Growth Behavior of Small Surface Fatigue Cracks in Al-15Zn Powder Metallurgy Alloy.

1994 ◽  
Vol 43 (493) ◽  
pp. 1251-1257
Author(s):  
Atsushi SUGETA ◽  
Masahiro JONO ◽  
Hideyuki MORIMOTO ◽  
Hiroaki SAKAMOTO
Keyword(s):  
Powder Metallurgy ◽  
Fracture Mechanics ◽  
Fatigue Cracks ◽  
Growth Behavior ◽  
Special Issue ◽  
Small Surface ◽  
Surface Fatigue ◽  
Powder Metallurgy Alloy

scholarly journals Initiation and Growth Behavior of Small Surface Fatigue Cracks on Forged P/M Aluminum Alloys.

1993 ◽  
Vol 42 (473) ◽  
pp. 176-182 ◽  
Author(s):  
Masahiro JONO ◽  
Atsushi SUGETA ◽  
Hideyuki MORIMOTO ◽  
Kunihiko BESSHO
Keyword(s):  
Aluminum Alloys ◽  
Fatigue Cracks ◽  
Growth Behavior ◽  
Small Surface ◽  
Surface Fatigue

Saw NDE Techniques for Monitoring the Growth Behavior of Small Surface Fatigue Cracks

1984 ◽  
pp. 217-227 ◽  
Author(s):  
M. T. Resch ◽  
B. D. London ◽  
G. F. Ramusat ◽  
H. H. Yuce ◽  
D. V. Nelson ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Growth Behavior ◽  
Small Surface ◽  
Surface Fatigue

Correlations Between Advanced Nondestructive Evaluation Methods and Fracture Mechanics Parameters

1980 ◽  
Vol 102 (1) ◽  
pp. 50-55 ◽  
Author(s):  
C. M. Teller ◽  
J. R. Barton ◽  
G. A. Matzkanin ◽  
F. N. Kusenberger ◽  
R. E. Beissner
Keyword(s):  
Surface Wave ◽  
Fracture Mechanics ◽  
Nondestructive Evaluation ◽  
Surface Waves ◽  
Fatigue Cracks ◽  
Small Surface ◽  
Magnetic Perturbation ◽  
Hinge Model ◽  
Pulse Echo ◽  
Aisi 4340

Investigations were conducted on surface entering fatigue cracks, 0.13 to 1.27 mm (0.005 to 0.05 in.) long, in rod-type tensile specimens of HY 180 and AISI 4340 steels using surface wave ultrasonics and magnetic perturbation. Pulse-echo, surface wave ultrasonic results indicate that at 10 MHz the minimum flaw size detectable in HY 180 specimens is two to three times larger than that in AISI 4340. Also, fatigue cracks as long as 0.76 mm (0.030 in.) in HY 180 specimens could not be reliably detected with 10 MHz surface waves unless load was applied to open the crack. Extensive magnetic perturbation measurements on AISI 4340 suggest a “hinge” model for the opening of small surface entering fatigue cracks.

Growth behavior of short surface fatigue cracks in 2 1/4 Cr-1 Mo steel

KSME Journal ◽  
1989 ◽  
Vol 3 (2) ◽  
pp. 78-85 ◽  
Author(s):  
Chang Min Suh ◽  
Robert O. Ritchie ◽  
Young Goo Kang
Keyword(s):  
Fatigue Cracks ◽  
Growth Behavior ◽  
Surface Fatigue

Assessing surface fatigue crack growth in railway wheelset axle

2020 ◽  
Vol 2 (106) ◽  
pp. 59-67
Author(s):  
D.V. Rudavskyi ◽  
Yu.I. Kaniuk ◽  
Z.A. Duriagina ◽  
V.V. Kulyk ◽  
M.S. Shefer ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
Calculation Model ◽  
Energy Approach ◽  
Shear Stresses ◽  
Surface Fatigue ◽  
Surface Fatigue Crack

Purpose: The aim of the proposed research is to create a calculation model of surface fatigue crack growth at the axle of railway wheelset working under operational loads. Design/methodology/approach: The energy approach of the fracture mechanics was used to formulate the calculation model of fatigue crack propagation at the wheelset axle surface. The method of least squares was used to determine the investigated material mechanical constants that the kinetic equations of the calculation model contain. The system of differential equations of crack growth kinetics was solved numerically using the Runge-Kutta method. Findings: On the basis of the energy approach of the fracture mechanics the calculation model of fatigue macrocrack growth in three-dimensional elastic-plastic body in case of a mixed-mode I+II+III macromechanism of fracture has been built. On the basis of the created calculation model, the kinetics of the growth of fatigue cracks was investigated both in the middle part of the wheelset axle and in the axle journal. Research limitations/implications: The results obtained on laboratory specimens should be tested during a real railway wheelset axle investigation. Practical implications: The created calculation model can be used in practice to formulate method of residual lifetime estimation of railway wheelset axle. Originality/value: It was shown, that surface crack kinetics depends not only on the crack initial area but also significantly depends on the crack edge geometry and comparatively small crack-like defects at the wheelset axle surface can reach critical sizes in comparatively short run. It has been found that mechanical shear stresses caused by the weight of the loaded railway wagon in the cross section of the wheelset axle journal can significantly accelerate the growth of the transverse fatigue crack at the axle surface, reducing the period of crack subcritical growth by about 20%.

Sign in / Sign up

Export Citation Format

Share Document