Author
Th.B. Kermanidis
Other affiliations: University of Thessaly
Bio: Th.B. Kermanidis is an academic researcher from University of Patras. The author has contributed to research in topics: Finite element method & Stress intensity factor. The author has an hindex of 11, co-authored 31 publications receiving 1040 citations. Previous affiliations of Th.B. Kermanidis include University of Thessaly.
Papers
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TL;DR: In this article, a three-dimensional finite element model has been developed to simulate the laser welding process and predict laser welded panel distortions, which takes into account thermal, metallurgical and mechanical aspects.
302 citations
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TL;DR: In this article, a parametric finite element analysis was conducted to investigate the effect of failure criteria and material property degradation rules on the tensile behaviour and strength of bolted joints in graphite/epoxy composite laminates.
Abstract: A parametric finite element analysis was conducted to investigate the effect of failure criteria and material property degradation rules on the tensile behaviour and strength of bolted joints in graphite/epoxy composite laminates. The analysis was based on a three-dimensional progressive damage model (PDM) developed earlier by the authors. The PDM comprises the components of stress analysis, failure analysis and material property degradation. The predicted load–displacement curves and failure loads of a single-lap single-bolt joint were compared with experimental data for different joint geometries and laminate stacking sequences. The stiffness of the joint was predicted with satisfactory accuracy for all configurations. The predicted failure load was significantly influenced by the combination of failure criteria and degradation rules used. A combination of failure criteria and material property degradation rules that leads to accurate strength prediction is proposed. For all the analyses performed, the macroscopic failure mechanism of the joint and the damage progression were also predicted.
241 citations
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TL;DR: In this article, a parametric analysis of the three-dimensional geometry was performed numerically using the finite element code ANSYS with special attention given to the detailed modelling of the area around the bolt in order to account for all damage modes.
Abstract: A three-dimensional progressive damage model was developed to simulate the damage accumulation and predict the residual strength and final failure mode of bolted composite joints under in-plane tensile loading. The parametric study included stress analysis, failure analysis and material property degradation. Stress analysis of the three-dimensional geometry was performed numerically using the finite element code ANSYS with special attention given to the detailed modelling of the area around the bolt in order to account for all damage modes. Failure analysis and degradation of material properties were implemented using a set of stress-based Hashin-type failure criteria and a set of appropriate degradation rules, respectively. In order to validate the finite element model, a comparison of stress distributions with results from analytical models found in the literature was carried out and good agreement was obtained. A parametric study was performed to examine the effect of bolt position and friction upon damage accumulation and residual strength.
142 citations
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TL;DR: In this paper, numerical and experimental results from an investigation on the laser forming process of metallic plates are discussed, a three-dimensional finite-element algorithm has been developed, which includes a non-linear transient coupled thermal-structural analysis; the temperature dependency of the thermal and mechanical properties of the material being accounted for.
112 citations
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TL;DR: In this paper, an analytical model for the prediction of distortions caused by laser forming of metallic sheets is proposed; it is applied for the case of bending and it considers the non-uniform temperature distribution throughout the thickness of the plate, the development of plastic deformations on a certain area of the material and the subsequent distortions at the end of the process.
94 citations
Cited by
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1,969 citations
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12 Mar 2014
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Abstract: In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).
1,539 citations
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TL;DR: In this article, a more comprehensive review of recent literature in the broader area of mechanics of mechanically fastened joints in polymer-matrix composite structures is presented, including joint design methodologies, considerations of the influence of geometric effects and fastener preload selection.
434 citations
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TL;DR: In this article, the differences in the microstructure, defects and mechanical behavior of porous structures from a β-type Ti 24Nb 4Zr 8Sn manufactured by electron beam melting (EBM) and selective laser melting (SLM) were investigated and correlated to the compressive mechanical and fatigue properties.
404 citations
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TL;DR: In this article, a three-dimensional finite element model has been developed to simulate the laser welding process and predict laser welded panel distortions, which takes into account thermal, metallurgical and mechanical aspects.
302 citations