Results 251 to 260 of about 42,527 (308)

Creep Crack Growth under Complex Loading

Journal of ASTM International, 2011
Abstract Fitness-for-service assessments of components operating at high temperature often require estimates of creep crack growth in service. Although methods for calculating creep crack growth are given in R5 and other codes, these methods are limited in terms of their range of application and can be over-conservative.
Ainsworth, R. A., Dean, D. W., Budden, P. J.   +2 more
openaire   +1 more source

Creep Crack Growth

1981
A concise review is presented of widely used theories for the quantitative description of the growth of cracks in creeping media. Deficiencies are highlighted of the way in which calculations of component lifetimes have been carried out. New data is presented which overcomes some of the deficiencies, and results are presented of calculated component ...
D. R. Hayhurst, C. J. Morrison, P. R. Brown   +2 more
openaire   +1 more source

CRACK TIP PARAMETERS FOR CREEP‐BRITTLE CRACK GROWTH

Fatigue & Fracture of Engineering Materials & Structures, 1998
Crack growth histories for creep‐brittle aluminium alloy 2519‐T87 are simulated by controlling the rate of release of finite element nodes along the crack growth path using a variable time‐step, nodal release algorithm. While earlier experimental studies established little or no correlation between time‐dependent fracture parameters and the crack ...
null Hall, null McDowell, null Saxena
  +4 more sources

Small-scale creep crack growth

Engineering Fracture Mechanics, 1992
Abstract The valid condition in which the stress strain field ahead of the crack tip is characterized by the stress intensity factor has been investigated. Creep crack growth tests of Alloy 718 with standard compact tension specimens have been carried out at a temperature of 923 K, which was proven to be in the small-scale creep region.
C.D. Liu, Y.F. Han, M.G. Yan, M.C. Chaturvedi   +3 more
openaire   +1 more source

Micromechanisms of creep crack growth

Scripta Metallurgica, 1989
Proposition d'une methode de prediction de la vitesse de propagation des fissures de fluage a partir des mesures experimentales du nombre de cavites aux extremites des ...
Yu, J Yu, Jin, HONG, SH
openaire   +1 more source

Mechanism of Thermally Assisted Creep Crack Growth

MRS Proceedings, 1995
AbstractWe use atomistic Monte-Carlo simulations to investigate the dynamics of cracks which sizes are smaller than the Griffith length. We demonstrate that such cracks can irreversibly grow proviso their size is larger than a certain critical length which is smaller than the Griffith length, as recently suggested [ L. Golubović and A.
Leonardo Golubović, Dorel Moldovan
openaire   +1 more source

Creep—fatigue crack growth

1994
In this chapter the main factors influencing high temperature creep—fatigue crack growth in engineering materials are discussed. The significance of minimum to maximum load ratio R, frequency, environment and temperature are considered in turn. Transgranular cycle dependent and intergranular time dependent controlled cracking processes are identified ...
G. A. Webster, R. A. Ainsworth
openaire   +1 more source

Creep crack growth in ductile, creep-resistant steels

International Journal of Fracture, 1987
Creep crack growth in two of the commonly used creep-resistant ferritic steels was investigated. Both steels were tested in the as-processed condition and after many years of service in electric power plants. The test temerature was 540°C (in one case also 500°C and 565°C) and test durations ranged from a few days to a year.
H. Riedel, V. Detampel
openaire   +1 more source

Creep Crack Growth

1989
On the background of the historical evolution of the subject area, the current knowledge on creep crack growth is reviewed. The discussion is grouped around the C* integral, which is the appropriate load parameter for describing creep crack growth in ductile materials.
openaire   +1 more source

Creep Crack Growth: From Discrete to Continuum Damage Modeling

2001
Creep crack growth in specimens and structural components has intensively been studied by many authors in the past decades. Depending on the scale adopted for the formulation of the problem, the related approach can be quite different. At the scale of individual cavities and those of the grain and grain boundaries, there is the micromechanical approach
Nguyen, B.N., Onck, P.R., van der Giessen, E.   +2 more
openaire   +2 more sources