Personne
John Botsis
Publications associées (80)
Design optimization of a CFRP-aluminum joint for a bioengineering application
Lightweight design demands and complexity requirements of modern high-end structures in aerospace, automotive, sports and bioengineering can be successfully covered by a combination of fiber reinforced polymers (FRPs) with metallic components. Conventional ...
Cambridge University Press (CUP)2019Transverse cracking in the bulk and at the free edge of thin-ply composites: experiments and multiscale modelling
John Botsis, Robin Amacher, Joël Cugnoni, Sébastien Kohler
Thin-ply composites were shown to exhibit significantly delayed transverse cracking, but the linear onset of damage scaling with ply thickness reported by Amacher et al. (2014) did not correspond to the established LEFM based in situ strength model. This s ...
2019The influence of through-thickness reinforcement geometry and pattern on delamination of fiber-reinforced composites: Part I - Experimental results
Véronique Michaud, John Botsis, Georgios Pappas
This experimental study reports effect of tuft geometry i.e., standard tufts and loops milled-down, and tufting pattern on Mode I interlaminar fracture in a GFRP. Standard tufting geometry is responsible for an increase in fracture resistance by 3.5-6 time ...
Elsevier2018Towards aerospace grade thin-ply composites: Effect of ply thickness, fibre, matrix and interlayer toughening on strength and damage tolerance
John Botsis, Robin Amacher, Joël Cugnoni, Larissa Sorensen, Sébastien Kohler
Thin-ply composites represent a promising approach to further improve the performance of carbon fibre composite structures thanks to their ability to delay the onset of matrix cracking and delamination up to the point of fibre dominated failure. However, t ...
ELSEVIER SCI LTD2018On the mechanical characteristics of a self-setting calcium phosphate cement
John Botsis, Luis Pablo Canal Casado, Dimitrios Karalekas, Alexios Bimis
Objective: To perform a mechanical characterization of a self-setting calcium phosphate cement in function of the immersion time in Ringer solution. Materials and methods: Specimens of self-setting calcium phosphate cement were prepared from pure alpha-TCP ...
Elsevier2017A multi-scale based cohesive zone model for the analysis of thickness scaling effect in fiber bridging
John Botsis, Luis Pablo Canal Casado
A cohesive zone model (CZM) is proposed to assess the thickness scaling effect associated with fiber bridging during fracture. The CZM was developed through a multi-scale simulation approach and utilizes an embedded cell model of the Double Cantilever Beam ...
Elsevier2017The influence of through-thickness reinforcement geometry and pattern on delamination of fiber-reinforced composites: Part II - Modeling
Véronique Michaud, John Botsis, Georgios Pappas
This article reports modeling techniques and results based on experimental Mode I characterization of a layered woven GFRP material with tufting reinforcement. Standard tuft and loop-less geometries are investigated on three different areal patterns to eva ...
Elsevier2017An efficient method for fiber bridging traction identification based on the R-curve: Formulation and experimental validation
John Botsis, Thomas Gmür, Joël Cugnoni, Guillaume Frossard
Fiber bridging is one of the main toughening mechanisms in mode I interlaminar and intralaminar fracture of laminated composites. Intact fibers exert closing forces on both faces of the crack, restraining crack propagation. An effective identification proc ...
Elsevier2017Mixed mode fracture behavior of welded wood joints investigated with the Arcan test
John Botsis, Joël Cugnoni, Parviz Navi, Martin Rhême
Friction welding of wood is an assembly method that is still under investigation and development. A possible application for welded wood joints is the fabrication of multi-layered panels (i.e., cross-laminated panels). In an effort to model the behavior of ...
Springer Verlag2016Intralaminar fracture of unidirectional carbon/epoxy composite: experimental results and numerical analysis
Fracture of carbon fiber reinforced polymers (CFRPs) is dominated by large scale fiber bridging which acts as a very important toughening mechanism. The objective of this paper is to investigate the intralaminar Mode I fracture in a unidirectional CFRP com ...
Elsevier2016