Publications de Parviz Navi | EPFL Graph Search

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

Property changes in thermo-hydro-mechanical processing COST Action FP0904 2010-2014: Thermo-hydro-mechanical wood behavior and processing

Parviz Navi

Thermo-hydro-mechanical (THM) treatment is a combined action of temperature, moisture, and mechanical force, which leads to modified wood (THMW). Various types of eco-friendly THM processes have been developed to enhance wood properties and generate new ma ...

Walter De Gruyter Gmbh2015

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

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

Micromechanics of creep and relaxation of wood. A review COST Action E35 2004-2008: Wood machining - micromechanics and fracture

Parviz Navi

Wood, like all polymeric materials, shows viscoelastic behaviour. The time dependent behaviour of wood depends on material anisotropy, temperature, moisture and stresses. To predict the behaviour of wood, numerous mathematical models have been developed la ...

De Gruyter2009

Experimental observations and micromechanical modeling of successive-damaging phenomenon in wood cells’ tensile behavior

Parviz Navi, Marjan Sedighi Gilani

Springer, Springer-Verlag2007

Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level

Parviz Navi, Marjan Sedighi Gilani

Springer, Springer-Verlag2007

Microfibril angle non-uniformities within normal and compression wood tracheids

Parviz Navi, Homeira Sunderland, Marjan Sedighi Gilani

Springer, Springer-Verlag2005

Simulation of cement paste microstructure hydration, pore space characterization and permeability determination

Parviz Navi, Karen Scrivener

An Integrated Particle Kinetics Model (IPKM) to simulate the evolution of cement microstructure during hydration is presented. The advantages of the model are that the space is not divided into discrete pixels, so there is no lower resolution on the size o ...

2005