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John Botsis

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Publications associées (116)

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

Joël Cugnoni, Thomas Gmür, John Botsis, 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

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

Mode I interlaminar fracture of carbon epoxy laminates: Effects of ply thickness

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

In this work, the influence of ply thickness on strain energy release rate (ERR) in delamination of carbon epoxy laminates is addressed. Specimens with three ply thicknesses: 0.030, 0.075 and 0.150 mm are tested. While the ERR at onset of crack propagation ...

Elsevier2016

Characterization of intralaminar mode I fracture of AS4/PPS composite using inverse identification and micromechanics

John Botsis, Luis Pablo Canal Casado, Georgios Pappas

A detailed experimental-numerical study of large scale bridging during intralaminar fracture of AS4/PPS uniaxial thermoplastic composite is reported. Identification of bridging tractions is carried out using: (a) An inverse identification method based on q ...

Elsevier2016

Intralaminar fracture of unidirectional carbon/epoxy composite: experimental results and numerical analysis

John Botsis, Georgios Pappas

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

Mixed mode fracture behavior of welded wood joints investigated with the Arcan test

Joël Cugnoni, Parviz Navi, John Botsis, 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 Verlag2016

Peri-implant bone adaptations to overloading in rat tibiae: experimental investigations and numerical predictions

Joël Cugnoni, John Botsis, Marco Piccinini

Objectives(i) To assess the effects of mechanical overloading on implant integration in rat tibiae, and (ii) to numerically predict peri-implant bone adaptation. Materials and methodsTranscutaneous titanium implants were simultaneously placed into both tib ...

Wiley-Blackwell2016

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

Joël Cugnoni, John Botsis, 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

Numerical prediction of peri-implant bone adaptation: Comparison of mechanical stimuli and sensitivity to modeling parameters

Joël Cugnoni, John Botsis, Marco Piccinini

Long term durability of osseointegrated implants depends on bone adaptation to stress and strain occurring in proximity of the prosthesis. Mechanical overloading, as well as disuse, may reduce the stability of implants by provoking bone resorption. However ...

Elsevier2016

Multi-scale modeling of elasto-plastic response of SnAgCu lead-free solder alloys at different ageing conditions: Effect of microstructure evolution, particle size effects and interfacial failure

Joël Cugnoni, John Botsis, Milad Maleki

In microelectronics applications, SnAgCu lead-free solder joints play the important role of ensuring both the mechanical and electrical integrity of the components. In such applications, the SnAgCu joints are subjected to elevated homologous temperatures f ...

Elsevier2016

Large scale fiber bridging in mode I intralaminar fracture. An embedded cell approach

John Botsis, Luis Pablo Canal Casado, Georgios Pappas

Fiber reinforced composites can develop large scale bridging upon mode I fracture. This toughening mechanism depends on the constituents and the geometry of the specimen, and is especially important in unidirectional laminates when fracture is parallel to ...

Elsevier2016

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

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

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

Mode I fracture of thin-ply carbon-epoxy laminates: effects of ply and specimen thickness

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard, Martin Boesiger

IMDEA Materials Institute2015

Fracture of thin-ply carbon-epoxy laminates: ply-thickness effects

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2015

An experimental-numerical investigation of hydrothermal response in adhesively bonded composite structures

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

Water absorption and thermal response of adhesive composite joints were investigated by measurements and numerical simulations. Water diffusivity, saturation, swelling, and thermal expansion of the constituent materials and the joint were obtained from gra ...

Elsevier2015

Specimen thickness dependence of large scale fiber bridging in mode I interlaminar fracture of carbon epoxy composite

Joël Cugnoni, John Botsis, Ebrahim Farmand Ashtiani

Large scale bridging is an important toughening mechanism in composite laminates that depends on the specimen geometry as well as the constituent materials. In this work, an iterative approach is applied to identify the effect of specimen thickness on trac ...

Elsevier2015

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

Joël Cugnoni, John Botsis, 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

Influence of the thin ply size on mode I and II energy release rate of unidirectional carbon epoxy laminates

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2014

Studies of hygrothermal degradation of a single fiber composite: An iterative approach with embedded optical sensors and numerical analysis

Joël Cugnoni, John Botsis, Marco Lai

The hydrothermal ageing of glass/epoxy interface is investigated using an experimental numerical approach on cylindrical epoxy specimens with centrally located optical fibers. A 24 mm long Bragg grating sensor is inscribed on the optical fiber and used to ...

Elsevier2014

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

Joël Cugnoni, John Botsis, 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

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