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Träfflista för sökning "LAR1:kth ;mspu:(review);pers:(Dahlberg Carl F. O. 1980)"

Sökning: LAR1:kth > Recension > Dahlberg Carl F. O. 1980

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1.
  • Halilovic, Armin E., et al. (författare)
  • A conceptual modeling approach for investigating multiple failure mechanisms in the environmentally driven ductile-to-brittle transition region
  • Recension (övrigt vetenskapligt/konstnärligt)abstract
    • A continuum modeling approach that considers two separate failure mechanisms of steels subjected to hydrogen embrittlement is proposed based on experimental observations. The brittle failure is modeled using a cohesive zone approach, where both the cohesive strength and the fracture energy are degraded when exposed to hydrogen. The ductile failure is modeled using the Gurson model that includes a strain driven nucleation of void. Here, the nucleation model also incorporates hydrogen degradation where an increase in hydrogen is assumed to increase the volume of nucleated voids. This modeling approach is divided into two parts where the first step is to utilize a conceptual degradation of both failure modes and calibrate modeling parameters, and the second part incorporates a coupled diffusion-mechanical approach.
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2.
  • Lindblom, David, et al. (författare)
  • In-situ neutron imaging of delayed hydrogen cracking in highstrength steel - experiments and modeling
  • Recension (övrigt vetenskapligt/konstnärligt)abstract
    • Hydrogen delayed fracture, also known as hydrogen-induced cracking, is a type of brittle fracture that occurs due to the slow diffusion and accumulation of hydrogen atoms, leading todecreased ductility and eventual cracking under constant load. This paper presents an in-situobservation, using neutron imaging, of delayed crack propagation caused by hydrogen embrittlement in a high strength martensitic steel specimen. The experiments involved mechanicalloading of a single-edge-notch bend specimen while submerged in an electrolyte solution (H2O+ 3.5% NaCl) under cathodic polarization to facilitate hydrogen ingress. Neutron transmission images were obtained in-situ and used to monitor intermittent crack propagation wasrecorded over a period of 12 hours. The stress state at each crack configuration was extracted from a three-dimensional elastic-plastic finite element simulation, which was tailoredto match the quantitative information acquired from the neutron radiographs of the fractureprocess. To gain insight into the evolution of hydrogen concentration with crack propagation,a modeling scheme for stress-assisted hydrogen diffusion was employed. These simulationsprovided qualitative information on the relation between intermittent crack propagation andthe subsequent supply of hydrogen to the crack tip. Finally, a failure locus was constructedbased on the calculated hydrogen concentration levels and the experimentally determinedcrack growth resistance.
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  • Resultat 1-2 av 2
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recension  (2)Ta bort avgränsningen
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övrigt vetenskapligt/konstnärligt (2)
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Dahlberg, Carl F... (2)Ta bort avgränsningen
Halilovic, Armin E. (2)
Tengattini, Alessand ... (1)
Faleskog, Jonas (1)
Efsing, Pål, 1965- (1)
Elmukashfi, Elsiddig (1)
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Woracek, Robin (1)
Lindblom, David (1)
Helfen, Lukas (1)
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Kungliga Tekniska Högskolan (2)
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