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Related publications (113)

Page 3 of 6

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

John Botsis, Joël Cugnoni, Parviz Navi, 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

A functional approach towards the design, development, and test of an affordable dynamic prosthetic foot

Grégory Alain Huot, Mathieu Manuel Janier, Kamiar Aminian, Véronique Michaud, John Botsis, Joël Cugnoni, Mathieu Pascal Falbriard, Klaus Benedikt Schönenberger, Rajasundar Chandran

Humanitarian actors involved in physical rehabilitation, such as the International Committee of the Red Cross (ICRC), usually provide their beneficiaries with lower-limb prostheses comprising Solid Ankle Cushion Heel (SACH) feet as these are considered app ...

PUBLIC LIBRARY SCIENCE2022

Reliability Analysis of Lead-free Solders

John Botsis, Joël Cugnoni

In this study, a deep analysis of the reliability of lead-free (SnAgCu) solders in comparison with tin-lead solders have been done for a particular aerospace application. Creep properties of this solder composition have been investigated, and results have ...

Int Assoc Engineers-Iaeng, Unit1, 1-F, 37-39 Hung To Road, Kwun Tong, Hong Kong, 00000, Peoples R China2008

Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

Hans Georg Limberger, John Botsis, Dragan Coric, Marco Lai

Optical low coherence reflectometry and fiber Bragg gratings written in small diameter (50 micrometer) optical fibers were used for measurements of non-homogenous internal strain fields inside an epoxy specimen with sub-grating length resolution. The resul ...

Optical Society of America2010

Delamination in cross-ply laminates: Identification of traction-separation relations and cohesive zone modeling

David Enrique Alanis Rojas, John Botsis, Joël Cugnoni, Ebrahim Farmand Ashtiani

Identification of traction separation relations is at the forefront of damage and fracture mechanics of composite laminates. Such relations are of particular interest in fracture of laminates consisting of layers of different fiber orientations. In this st ...

Elsevier2015

Design optimization of a CFRP-aluminum joint for a bioengineering application

John Botsis, Georgios Pappas

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 ...

2019

Influence of gait loads on implant integration in rat tibiae: Experimental and numerical analysis

John Botsis, Joël Cugnoni, Marco Piccinini

Implanted rat bones play a key role in studies involving fracture healing, bone diseases or drugs delivery among other themes. In most of these studies the implants integration also depends on the animal daily activity and musculoskeletal loads, which affe ...

Elsevier2014

The 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 ...

Elsevier2017

A 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 ...

Elsevier2017

Effects of large scale bridging in load controlled fatigue delamination of unidirectional carbon-epoxy specimens

John Botsis, Joël Cugnoni, Ebrahim Farmand Ashtiani

Fatigue delamination growth in composites is accompanied by large scale bridging (LSB) that yields important toughening effects. However, the extent of this mechanism depends on the laminate geometry rendering its modeling a challenging task. This work pre ...

Elsevier2016

Experiments and numerical modelling on angle-ply laminates under remote mode II loading

John Botsis, Georgios Pappas, Niels Pichler, Charlie Joseph Simon Blondeau

Delamination is a very frequent damage mechanism that affects the integrity of laminated composites. In this study, the effect of ply orientation on crack growth resistance was analyzed for three different anti-symmetric interfaces (+/- 30 degrees, +/- 45 ...

ELSEVIER SCI LTD2020

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

John Botsis, Joël Cugnoni, Parviz Navi, 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

A comparative study of mode I delamination behavior of unidirectional glass fiber-reinforced polymers with epoxy and polyurethane matrices using two methods

John Botsis, Georgios Pappas

The mode I delamination behavior of a unidirectional glass-fiber reinforced polymer with a prototype elasto-plastic polyurethane matrix (GF/PU) was investigated and compared with that of glass/epoxy (GF/EP) using double cantilever beam specimens. Fracture ...

PERGAMON-ELSEVIER SCIENCE LTD2019

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

Anastasios Vassilopoulos, John Botsis, Behzad Dehghan Manshadi, 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

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

John Botsis, 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

Factors affecting subject-specific finite element models of implant-fitted rat bone specimens: critical analysis of a technical protocol

John Botsis, Joël Cugnoni, Marco Piccinini

The authors propose a protocol to derive finite element (FE) models from micro computer tomography scans of implanted rat bone. A semi-automatic procedure allows segmenting the images using specimen-specific bone mineral density (BMD) thresholds. An open-s ...

Taylor & Francis2014

The 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 ...

Elsevier2018

Stress-relaxation and microscopic dynamics of rabbit periodontal ligament

John Botsis, Colin Sanctuary

2007

An efficient method for fiber bridging traction identification based on the R-curve: Formulation and experimental validation

John Botsis, Joël Cugnoni, Thomas Gmür, 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 ...

Elsevier2017

Bone reactions to controlled loading of endosseous implants: a pilot study

John Botsis, Joël Cugnoni

Objectives: To validate an experimental setup designed to apply load onto bone tissue using osseointegrated implants in a rabbit model. Specifically, (1) to design an apparatus capable of generating controlled forces, (2) to assess implant placement, maint ...

Wiley-Blackwell2008