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John Botsis

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Publications associées (116)

Isothermal Ageing of SnAgCu Solder Alloys: Three-Dimensional Morphometry Analysis of Microstructural Evolution and Its Effects on Mechanical Response

Joël Cugnoni, John Botsis, Milad Maleki

Due to the high homologous temperature and fast cooling rates, the microstructures of SnAgCu (SAC) solders are in a meta-stable state in most applications, which is the cause of significant microstructural evolution and continuous variation in the mechanic ...

Springer2014

An iterative analytical/experimental study of bridging in delamination of the double cantilever beam specimen

John Botsis, Behzad Dehghan Manshadi, Anastasios Vassilopoulos, Ebrahim Farmand Ashtiani

Large scale bridging in mode-I delamination of layered composites is an important toughening mechanism. While its extent depends on constituent materials, it is also influenced by specimen geometry. Here, an analytical approach is adopted to express the th ...

Elsevier2014

Monitoring strain gradients in adhesive composite joints by embedded fiber Bragg grating sensors

Hans Georg Limberger, John Botsis, Véronique Michaud, Roohollah Sarfaraz Khabbaz, Georgios Violakis, Luis Pablo Canal Casado

The adhesive bonding of composite materials can be applied to assemble light-weight structures for aeronautical applications. However, the application of adhesive bonds in primary load-bearing structures is limited by the lack of adequate techniques to mon ...

Elsevier2014

Thin ply composites: Experimental characterization and modeling of size-effects

Joël Cugnoni, John Botsis, Robin Amacher, Larissa Sorensen

Thin-ply composites are rapidly gaining interest in the composite industry, not only because of the larger design possibilities that they offer, but also because of positive size effects that have been shown to improve performance in various loading condit ...

Elsevier2014

Influence of the moisture content on the fracture characteristics of welded wood joint. Part 1: Mode I fracture

Joël Cugnoni, Parviz Navi, John Botsis, Martin Rhême

Friction welding is a joining technique for wood materials. The positive aspects of this technique are the speed of processing and the absence of chemical or mechanical agents, but the welded joints are not water resistant. To understand better the effect ...

De Gruyter2013

External Mechanical Microstimuli Modulate the Osseointegration of Titanium Implants in Rat Tibiae

Joël Cugnoni, John Botsis

Purpose. To assess the effect of external mechanical microstimuli of controlled magnitude on the microarchitecture of the peri-implant bone beds in rat tibiae. Materials and Methods. Tibiae of forty rats were fitted with two transcutaneous titanium cylinde ...

Hindawi Publishing Corporation2013

Monitoring strain gradients in adhesive composite joints by embedding fibre Bragg grating sensors

Hans Georg Limberger, John Botsis, Véronique Michaud, Behzad Dehghan Manshadi, Georgios Violakis, Luis Pablo Canal Casado

2013

Monitoring and characterization of the interfacial fracture in sandwich composites with embedded multiplexed optical sensors

Joël Cugnoni, John Botsis, Ebrahim Farmand Ashtiani

Interfacial debonding is one of the most critical damage modes that threatens the structural performance of sandwich composites. In this work, integrated multiplexed fiber Bragg grating (FBG) sensors of 1 mm gauge length are used for detection and characte ...

Elsevier Sci Ltd2013

Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture

Joël Cugnoni, Parviz Navi, John Botsis, Martin Rhême

As a second part of this series, the present study also addresses the water resistance of joints obtained by friction welding. Here, the mode II fracture is in focus, that is, 4-points end-notched flexure specimens (4-ENF) were investigated with various mo ...

De Gruyter2013

Microstructure-based modeling of the ageing effect on the deformation behavior of the eutectic micro-constituent in SnAgCu lead-free solder

Joël Cugnoni, John Botsis, Milad Maleki

The eutectic micro-constituent in SnAgCu solder governs the deformation behavior of the joint as it shows better deformation resistance than the Sn dendrites and occupies a high volume percentage of the whole solder. The main scope of this study is to deve ...

Elsevier2013

A combined experimental/numerical study of the scaling effects on mode I delamination of GFRP

John Botsis, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Bridging by intact fibers is an important toughening mechanism in composite materials. However, a direct experimental evaluation of its contribution is difficult to achieve and in the case of large scale bridging the thickness, h, may have an important inf ...

Elsevier2013

On the Effects of the Lateral Strains on the Fiber Bragg Grating Response

John Botsis, Dimitrios Karalekas, Marco Lai

In this paper, a combined experimental-numerical based work was undertaken to investigate the Bragg wavelength shift response of an embedded FBG sensor when subjected to different conditions of multi-axial loading (deformation). The following cases are exa ...

Mdpi Ag2013

Implementation of the "loaded implant" model in the rat using a miniaturized setup - description of the method and first results

Joël Cugnoni, Philippe Bonhote, John Botsis

Objective To miniaturize the loaded implant model to permit its application to small rodents. In this model, two titanium implants are placed 8 mm apart with their heads protruding from the skin and are forced together by a dedicated actuator. To assess th ...

Wiley-Blackwell2012

Monitoring of non-homogeneous strains in composites with embedded wavelength multiplexed fiber Bragg gratings: A methodological study

John Botsis, Samuel Stutz, Dragan Coric

For the detection of problems like fastening failures and delamination in composites, the employment of embedded fiber Bragg grating (FBG) sensors is considered an effective tool to measure non-homogeneous internal strains near damage or interfaces of diss ...

2012

Numerical And Statistical Estimates Of The Representative Volume Element Of Elastoplastic Random Composites

Joël Cugnoni, John Botsis, Matteo Galli

In many applications elastoplastic composites are used in limited amounts, therefore it is important to have estimates of the size of their representative volume element both for modeling and experimental purposes. In this work the tensile response of part ...

Elsevier2012

Low energy impact damage monitoring of composites using dynamic strain signals from FBG sensors - Part I: Impact detection and localization

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

Fiber reinforced composite materials risk to suffer from subsurface, barely visible, damage induced by transverse relatively low energy impacts. This two-paper series presents a method for the localization of an impact and identification of an eventual dam ...

2012

Low energy impact damage monitoring of composites using dynamic strain signals from FBG sensors - Part II: Damage identification

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

In part I of this two-paper series, a method for the localization of an impact using dynamic strain signals from fiber Bragg grating (FBG) sensors is presented. In this paper, an inverse numerical-experimental method allowing to identify the damage based o ...

2012

An experimental-numerical study of moisture absorption in an epoxy

Joël Cugnoni, John Botsis, Dragan Coric, Marco Lai

It is well known that moisture absorption impairs the mechanical and physical properties of polymers. Conventionally, the material's hygric strains are described as the product of a constant coefficient of moisture expansion (CME) and moisture concentratio ...

2012

Composites Part A: Applied Science and Manufacturing

Thomas Gmür, John Botsis

Elsevier2012

Crack tip identification with long FBG sensors in mixed-mode delamination

John Botsis, Samuel Stutz, Daniel Sans Canovas

The uncertainty of the crack tip position inside composite coupons during a delamination test under variable fracture mode conditions reduces the accuracy of the experimental results. In this work a method is presented where the crack tip position is locat ...

2012

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