Publikasjoner og ansvarsområder
Application of LBW and LAHW for fillet welds of 12 and 15 mm structural steel
Additive Manufacturing for repair – great potential waiting to be explored
Effect of Thermal Residual Stresses on Ductile-to-Brittle Transition of a Bi-material Specimen by Using the CAFE Method
The effect of residual stress on fracture of materials or structures has been widely studied. However, its influence on ductile-to-brittle transition (DBT), a crucial phenomenon of structural materials, has rarely been investigated so far. In the present study, employing the eigenstrain method resid...
A piecewise offset deposition strategy for reducing residual stress and distortion of wire and arc additive manufactured thin-walled structures
A new method to estimate the residual stresses in additive manufacturing characterized by point heat source
Residual stress in additive manufacturing (AM) is one of the key challenges in terms of structural integrity and finish quality of printed components. Estimating the residual stress distribution on additively manufactured components is complex and computationally expensive with full scale thermo-mec...
Stress-strain curves of metallic materials and post-necking strain hardening characterization: A Review
For metallic materials, standard uniaxial tensile tests with round bar specimens or flat specimens only provide accurate equivalent stress–strain curve before diffuse necking. However, for numerical modelling of problems where very large strains occur, such as plastic forming and ductile damage and ...
Effect of the Lüders plateau on ductile fracture with MBL model
In this study, the effect of Lüders plateau on the ductile crack growth resistance has been investigated with the Gurson damage model and the modified boundary layer (MBL) model, under mode I plane strain condition. The Lüders plateau is modeled as horizontal by keeping the plateau stress ...
CAFE based Multi-scale Modelling of Ductile-to-Brittle Transition of Steel with a Temperature Dependent Effective Surface Energy
It is still a challenge to numerically achieve the interactive competition between ductile damage and brittle fracture in ductile-to-brittle transition (DBT) region. In addition, since two types of fracture occur at two independent material length scales, it is difficult to process them with the sam...
Experimental measurement of temperature-dependent equivalent stress-strain curves of a 420 MPa structural steel with axisymmetric notched tensile specimens
Recently, the authors in this paper proposed a correction function to determine material’s equivalent stress-strain curve with axisymmetric-notched tensile specimens. In this study, tensile tests were performed at room temperature, -30℃ and -60℃ with axisymmetric notched tensile specimens to verify ...