Browsing NTNU Open by Author "Berto, Filippo"
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40CrMoV13.9 notched specimens under multiaxial fatigue: An overview of recent results
Razavi, Seyed Mohammed Javad; Peron, Mirco; Torgersen, Jan; Berto, Filippo; Welo, Torgeir (Journal article; Peer reviewed, 2017)The multiaxial fatigue strength of circumferentially V-notched and semicircular notched specimens made of 40CrMoV13.9 has been investigated in this paper. The multiaxial load were applied using combined tension and torsion ... -
A comparison between numerical and approximate methods for rapid calculation of NSIFs
Solberg, Klas; Lepore, Marcello; Berto, Filippo (Journal article; Peer reviewed, 2019)To more rapidly predicting the integrity of components weakened by sharp notches, notch stress intensity factors (NSIFs) are usually evaluated. Many methods have been proposed evaluating NSIFs, ranging from the stress ... -
A diagram for capturing and predicting failure locations in notch geometries produced by additive manufacturing
Solberg, Klas; Berto, Filippo (Journal article; Peer reviewed, 2020)In a recent work by the authors Solberg and Berto (2019), as-built notch geometries of Inconel 718 produced by selective laser melting was investigated under fatigue loading. One of the findings was that fatigue did not ... -
A metallurgical and thermal analysis of Inconel 625 electron-beam welded joints
Romanin, Luca; Ferro, Paolo; Fabrizi, Alberto; Berto, Filippo (Journal article; Peer reviewed, 2019)Inconel 625 is a nickel-based superalloy that finds application in many industrial sectors thanks to its high strength, excellent fabricability, and outstanding corrosion resistance. It is characterized by a good weldability ... -
A novel algorithm for crack path identification based on infrared images
Romanin, Luca; Vinogradov, Alexey; Berto, Filippo; Ferro, Paolo (Journal article; Peer reviewed, 2019)The present work aims at developing a new approach towards the analysis of the crack path through the access to the information from the infrared (IR) video imaging of the steady fatigue crack growth. We first test some ... -
A novel approach for assessing the fatigue behavior of PEEK in a physiologically relevant environment
Peron, Mirco; Torgersen, Jan; Berto, Filippo (Journal article; Peer reviewed, 2018)In recent years, the need of surgical procedures has continuously increased and, therefore, researchers and clinicians are broadly focusing on the development of new biocompatible materials. Among them, polyetheretherketone ... -
A strain-based criterion for failure load prediction of steel/CFRP double strap joints
Razavi, Seyed Mohammad Javad; Ayatollahi, Majid Reza; Majidi, Hamid Reza; Berto, Filippo (Journal article, 2018)One of the most effective approaches to improve the strength of steel structures is using the carbon fiber reinforced polymer (CFRP) as externally-bonded sheets. In this paper, a strain-based failure criterion, namely the ... -
A synthesis of geometry effect on brittle fracture
Razavi, Seyed Mohammad Javad; Ayatollahi, Majid reza; Berto, Filippo (Journal article, 2018)There are numerous analytical solutions in order to take into account the geometry effect on the fracture toughness and the fracture load of the cracked specimens. However, due to the complexities of the mentioned criteria ... -
A three-dimensional long-term strength criterion of rocks based on micromechanical method
XP, Zhou; XC, Huang; Berto, Filippo (Journal article; Peer reviewed, 2018)Rock-like materials are driven not only by applied stresses, but also by time that exhibits creep characteristics. It is significant to establish three-dimensional long-term strength criterion of rocks. In this paper, it ... -
Acoustic emission assessment of impending fracture in a cyclically loading structural steel
Rastegaev, Igor; Danyuk, Alexey; Afanas’yev, Maxim; Merson, Dmitry; Berto, Filippo; Vinogradov, Alexei (Peer reviewed; Journal article, 2016)Using the advanced acoustic emission (AE) technique, we address the problem of early identification of crack initiation and growth in ductile structural steels under cyclic loading. The notched 9MnSi5 steel specimens with ... -
Acoustic emission study on the effect of notch shape and temperature on elastic energy release during impact testing of 17Mn1Si pipe steel
Panin, S.V.; Byakov, AV; Vlasov, IV; Maruschak, PO; Berto, Filippo; Vinogradov, Alexey (Journal article; Peer reviewed, 2018)Main fracture mechanisms are determined in 17Mn1Si steel during impact Charpy testing of specimens with three types of notches at different test temperatures covering ductile-to-brittle transition. The influence of the ... -
Additive manufacturing of fine-grained and dislocation-populated CrMnFeCoNi high entropy alloy by laser engineered net shaping
Guan, Shuai; Wan, Di; Solberg, Klas; Berto, Filippo; Welo, Torgeir; Yue, Tai Man; Chan, K.C. (Journal article; Peer reviewed, 2019)The equiatomic CrMnFeCoNi high entropy alloy is additively manufactured by the laser engineered net shaping (LENSTM) process, and the solidification conditions, phase formation, as-deposited microstructures, and tensile ... -
Additive Manufacturing of Semiconducting Silicon
Witsø, Peder Solum (Master thesis, 2019)Additiv tilvirkning er en produksjonsteknisk klasse som benyttes i mange industrisektorer. Produksjonsteknikken kan prosessere et bredt utvalg av metaller, polymerer og keramer, men additiv tilvirkning av halvledere er ... -
Advanced local approach for the fatigue assessment of aluminium weldments
Leonardi, Andrea (Master thesis, 2018)The first step in fatigue design of welded joint is particularly complex e difficult. Welded bead geometries can not be precisely definied. Parameters such as bead shape and toe radius change from joint to joint, even if ... -
An Energy-Based Approach for Fatigue Life Estimation of Welded Joints without Residual Stress through Thermal-Graphic Measurement
Mi, Chengji; Li, Wentai; Xiao, Xuewen; Berto, Filippo (Journal article; Peer reviewed, 2019)The traditional methodologies for fatigue life assessment of welded joints strongly depend on geometries and surface characteristics, as well as time. In this paper, an energy-based approach, independent of structures ... -
An In-Depth Analysis of the Bond Strength of a Dissimilar Al-Fe HYB (Hybrid Metal Extrusion & Bonding) Joint
Mathiasson, Marie (Master thesis, 2019)Den patenterte Hybrid Metal Extrusion & Bonding (HYB) sveiseprosessen muliggjør sammenføyning av aluminium og stålkomponenter ved bruk av tilsettmateriale og plastisk deformasjon i fast fase. I denne rapporten er det gitt ... -
An innovative micromechanics-based three-dimensional long-term strength criterion for fracture assessment of rock materials
Zhou, Xiao-Ping; Huang, Xiao-Cheng; Berto, Filippo (Journal article; Peer reviewed, 2018)Rocks may exhibit time-dependent behaviors. Long-term strength criterion significantly dominates creep failure of rocks. Rocks contain many microcracks, which lead to degrade of long-term strength. In this paper, it is ... -
Analysis of the plastic zone near the crack tips under the uniaxial tension using ordinary state‐based peridynamics
Zhou, XP; Shou, YD; Berto, Filippo (Journal article; Peer reviewed, 2018)In this paper, the plastic model of ordinary state‐based peridynamics is established. The size and shape of plastic zone around crack tips with the different inclination angles are simulated using ordinary state‐based ... -
Application of an average strain energy density criterion to obtain the mixed mode fracture load of granite rock tested with the cracked asymmetric four-point bend specimens
Razavi, Seyed Mohammad Javad; Aliha, Mohammad Reza Mohammad; Berto, Filippo (Journal article, 2018)Mixed mode brittle fracture behaviour of granite rock is studied experimentally and theoretically using Asymmetric Four Point Bend (AFPB) specimens containing pre-cracks subjected to different mixed mode loading conditions, ... -
Application of the Theory of Critical Distances for Fatigue Assessment of Notched Additively Manufactured Inconel 718
Hornnes, Marius (Master thesis, 2019)Inconel 718 er et materiale som er velegnet til bruk ved høye temperaturer og i korrosivt miljø. Materialet har i tillegg egenskaper som gjør det vanskelig å produsere komponenter med komplekse geometrier ved bruk av ...