Blar i NTNU Open på forfatter "Kjellstadli, Jonas Tøgersen"
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Burst Distribution by Asymptotic Expansion in the Equal Load Sharing Fiber Bundle Model
Kjellstadli, Jonas Tøgersen (Journal article; Peer reviewed, 2019)We derive an asymptotic series expansion for the burst size distribution in the equal load sharing fiber bundle model, a predominant model for breakdown in disordered media. Earlier calculations give expressions with correct ... -
Can Local Stress Enhancement Induce Stability in Fracture Processes? Part I: Apparent Stability
Kjellstadli, Jonas Tøgersen; Bering, Eivind; Hendrick, Martin; Pradhan, Srutarshi; Hansen, Alex (Journal article; Peer reviewed, 2019)By comparing the evolution of the local and equal load sharing fiber bundle models, we point out the paradoxical result that stresses seem to make the local load sharing model stable when the equal load sharing model is ... -
Can Local Stress Enhancement Induce Stability in Fracture Processes? Part II: The Shielding Effect
Kjellstadli, Jonas Tøgersen; Bering, Eivind; Pradhan, Srutarshi; Hansen, Alex (Journal article; Peer reviewed, 2019)We use the local load sharing fiber bundle model to demonstrate a shielding effect where strong fibers protect weaker ones. This effect exists due to the local stress enhancement around broken fibers in the local load ... -
Local versus Equal Load Sharing in the Fiber Bundle Model
Kjellstadli, Jonas Tøgersen (Doctoral theses at NTNU;2019:368, Doctoral thesis, 2019)Fracture is a huge field of research that includes physics, geology, materials science, and engineering. Most approaches are very specialized, but what if we instead want to focus on the big picture to look for general ... -
A pilot study of scoring individual sleep apnea events using non-contact radar technology, pulse oximetry and machine learning (Somnofy®)
Toften, Ståle; Kjellstadli, Jonas Tøgersen; Tyvold, Stig Sverre; Moxness, Mads Henrik Strand (Peer reviewed; Journal article, 2021)The gold standard for assessing sleep apnea, polysomnography, is resource intensive and inconvenient. Thus, several simpler alternatives have been proposed. However, validations of these alternatives have focused primarily ... -
Variation of elastic energy shows reliable signal of upcoming catastrophic failure
Pradhan, Srutarshi; Kjellstadli, Jonas Tøgersen; Hansen, Alex (Journal article; Peer reviewed, 2019)We consider the Equal-Load-Sharing Fiber Bundle Model as a model for composite materials under stress and derive elastic energy and damage energy as a function of strain. With gradual increase of stress (or strain) the ...