Results 261 to 270 of about 366,784 (310)

Crack growth and closure behaviour of surface cracks

International Journal of Fatigue, 2004
Abstract This paper investigated the crack growth and closure behaviour of surface cracks in AISI 4130 alloy steel under the constant amplitude loading and single-overload conditions. The compliance measurements of depth- and surface-wise crack closure were performed using the backface strain gauge and the near-tip gauge, respectively.
exaly   +2 more sources

Model for surface cracking

Physical Review B, 1993
We introduce a network model to study the cracking of the surface of a material subjected to an imposed strain along one boundary, or to a surface shrinkage induced by drying or cooling. The model we study is an electrical analog of the mechanical problem, and consists in a network of fuses whose breaking thresholds are randomly distributed.
COLINA H, DE ARCANGELIS, Lucilla, ROUX S.   +2 more
openaire   +2 more sources

Recognition of pavement surface crack

2010 Sixth International Conference on Natural Computation, 2010
This article describes the pavement crack detection system architecture shows the hardware options and rationale, as well as the system works. This paper uses the median of the road image de-noising filter. In contrast to edge detection sobel and prewitt operator to verify the validity and advantages of the sobel.
Pengyu Zhang, Hong Li
openaire   +1 more source

On the behavior of crack surface ligaments

Nuclear Engineering and Design, 1996
Small ligaments connecting the fracture surfaces just behind a moving crack front are assumed to exist under certain conditions. The ligaments are rapidly torn as the crack advances. Inelastic straining of such ligaments influences the energy balance in the fracture process.
P. Nilsson, K.-G. Sundin, P. Ståhle
openaire   +1 more source

Crack surface contact of surface and internal cracks in a plate with residual stresses

International Journal of Fracture, 1994
The problem of a mode I surface or internal crack in a plate with residual stresses is examined. The emphasis in this study is in accounting for crack surface contact. The importance of such problems is realized in both crack detection and in the stress intensity factor calculations.
Roger D. Cordes, Paul F. Joseph
openaire   +1 more source

All-crack remanufacturability evaluation for blade with surface crack

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2021
Remanufacturing repair has been applied as a promising technology to extend the fatigue life of damaged components. For the compressor blade with shallow surface crack, crack can be directly repaired by crack arrest and healing technology. However, for the blade with macrosurface crack, a surface notch will be generated by crack grinding process and ...
Mingchao Ding, Yuanliang Zhang
openaire   +1 more source

Crack‐Resistance Curves of Surface Cracks in Alumina

Journal of the American Ceramic Society, 1988
The resistance of coarse‐grained alumina to stable crack growth, initiated from “naturally’occurring surface flaws, was studied in strength tests with a bend‐bar technique. The surface cracks experienced R‐curve behavior over the first few hundred micrometers; i.e., the applied crack driving force had to be increased with crack extension. Compared to R
Rolf W. Steinbrech, Olaf Schmenkel
openaire   +1 more source

Crack growth rate of an inclined surface crack

Engineering Fracture Mechanics, 1992
Investigation of surface crack growth in 16MnR steel specimens with crack inclination angle β = 0°, 30° and 45° and under the condition of biaxial loading ratio Px:Py = 0, 0.5 and 1 is reported in this paper. A formula of the stress intensity factor for surface cracked cruciform specimens loaded biaxially is calibrated using the finite element method ...
Zeng Zhaojing, Dai Shuho
openaire   +1 more source

Crack propagation in solids and crack-surface roughness

Physica A: Statistical Mechanics and its Applications, 1999
It is seen from extensive computer simulation results and some experimental observations that for inhomogenous solids with moving cracks, the surface roughness exponent $\xi$ crosses over from a low value $\xi \sim 0.42$ to a higher value $\xi \sim 0.8$, as the crack-tip velocity increases above a certain threshold.
Chakrabarti, Buddhapriya, Chakrabarti, Bikas K   +1 more
openaire   +1 more source

Anisotropic clustering on surfaces for crack extraction

Machine Vision and Applications, 2015
Machine vision provides an efficient way for the automatic crack detection of civil structures. However, it is still very challenging to extract the small cracks embedded in noisy background. Even some very recent methods require manual intervention or omission of crack width.
Guoteng Zhao, Tongqing Wang, Junyong Ye
openaire   +1 more source