[PDF] Top 20 Fatigue crack initiation and growth in a CrMo steel under hydrogen pressure

... Fatigue crack initiation Fatigue crack growth a b s t r a c t Along the hydrogen supply chain, metallic components, such as pressure vessels, com- ... Voir le document complet

... 2.2. Fatigue test conditions and geometry of the specimens ...machine and geometry of the specimens Two types of fatigue tests have been carried out: crack initiation and ... Voir le document complet

... frequency in the gigacycle regime. In this work, thin flat sheet, with ...of a complex phase ferrite-martensitic steels were considered for carrying out fatigue tests at high frequency (20 ... Voir le document complet

... of fatigue failure in structural materials has motivated many works towards assessing the physical reasons for material sensitivity to corrosion fatigue (CF) and providing adequate damage ... Voir le document complet

... than a critical level of 16 MPam 1/ 2 with higher crack growth rate than in high ...vapour in both gases. For K max higher than 16 MPam 1/2 , much faster growth rates ... Voir le document complet

... Thermal fatigue tests on AISI 316L(N) austenitic stainless steel samples are performed through pulsed laser on specimen that can be subjected to an additional static mechanical ...out in Helium ... Voir le document complet

... R A C T The present work is devoted to the investigation of fatigue crack initiation and growth in middle-cycle fatigue ( ∼10 5 ...quenched and tempered ... Voir le document complet

... the crack growth in fatigue, the crack growth rate is deduced and plotted versus crack growth for each sample ( ...). In the beginning of the ... Voir le document complet

... measurement In order to determine the temperature field on the sur- face of the specimen, a nonintrusive measurement tech- nique by infrared pyrometry was ...chosen. In the test, an advanced, ... Voir le document complet

... multiaxial fatigue crack initiation modes based on SEM observa- ...of crack initiation preferential sites shows that grains with multiple slip have a high probability of ... Voir le document complet

... jump in displacement field al- lows to identify crack ...the crack growth becomes steady when around three or four tows are ...dispersion in crack growth results could also ... Voir le document complet

... dation and g s is the related damage coefficient ( Table 1 ...is in good agreement with the experimental one ( ...pletely, and on the other hand a huge sliding parallel to fibres direction ... Voir le document complet

... some fatigue tests on notched specimens without car- bon strip are carried out to estimate the critical strain energy release rates in both warp and weft laminates made of two woven ...tested ... Voir le document complet

... The crack growth mechanism is a very complex process which starts with various matrix damage processes, like transverse crack- ing, longitudinal cracking, fibre debonding or delamination, that ... Voir le document complet

... conducted in NaCl/CP, three different specimens were used and the corresponding curves are well ...investigated, crack growth rates remain below the value corresponding to the plateau ... Voir le document complet

... encountered in measuring the crack length because of the stepwise nature of the crack growth and the extensive damage region associated with the crack ...I fatigue behav- ... Voir le document complet

... the crack tip acts as an hydrogen diffusion ...mechanisms and/or phase transformation on hydrogen distribution at the local ...with hydrogen content measurement at the local scale ... Voir le document complet

... measurements and the determination of the thermal load- ...especially in surface, since thermocou- ple soldering can disturb temperature measurements them- ...selves. In addition, these measurements ... Voir le document complet

... fracture in the range of giga cycle loading are classified based on the structural signs of damage related to a broad spectrum of spatial scales, including persistent slip bands (PSBs), fatigue ... Voir le document complet

... The fatigue crack growth rate data for Paris regime were provided by the OEM for conditions corresponding to the local temperature in the rim and the appropriate stress ...from a ... Voir le document complet