Publications associées à Damage tolerance

A WIM-Based Assessment of Multiple Vehicle Presence Effects on Fatigue Damage of Highway Bridges

Alain Nussbaumer, Scott Walbridge, Matthew James Sjaarda

The fatigue provisions for bridge design in North America and Europe are highly simplified for the sake of practical implementation, in comparison with the state of the art in understanding of the true fatigue behavior. Historically, one significant simpli ...

2024

Discretization Uncertainties of Flow and Fatigue Damage Simulations of a Reversible Francis Pump-Turbine at Off-Design Operation in Turbine Mode

Drazen Dujic, Philippe Alexandre Bontemps, Daniel Biner

In the framework of the XFLEX HYDRO H2020 European Project, a 5 MW reversible Francis pump-turbine prototype, equipped with an industrial full size frequency converter, is investigated to demonstrate enhanced grid regulation capacities of variable speed hy ...

SPRINGER INTERNATIONAL PUBLISHING AG2022

Out-of-plane (flatwise) behavior of through-tenon connections using the integral mechanical attachment technique

Yves Weinand, Aryan Rezaei Rad, Henry V. Burton

This paper aims to characterize the force–deformation response of through-tenon wood-wood connections subjected to out-of-plane (flatwise) loads. Six beech LVL timber specimen groups with variations in the fiber orientation (parallel and perpendicular) and ...

2020

Acoustic emission and ultrasonic testing for fatigue damage detection in a RC bridge deck slab

Eugen Brühwiler, Imane Bayane

There is a significant need to examine precisely the conditions of concrete road bridges because of the increasing traffic and axle loads and the fact that most existing bridges were not designed with respect to fatigue. In-situ investigations are challeng ...

2019

Assessing the compressive strength of concrete under sustained actions: From refined models to simple design expressions

Aurelio Muttoni, Miguel Fernández Ruiz, Darko Tasevski

The detrimental influence of high levels of sustained load on the compressive strength of concrete has been acknowledged and investigated since the 1950s. Despite the potential significance of this phenomenon in many situations, current design codes still ...

2019

Effect of Loading Pattern on Fatigue Behavior of Laminated Composites

Thomas Keller, Anastasios Vassilopoulos, Abdolvahid Movahedirad

The effect of load interruptions on the fatigue behavior of (±45)2s angle-ply glass/epoxy composite laminates was investigated in this work. Constant amplitude fatigue experiments were performed at different stress levels to derive base line fatigue data. ...

MDPI2018

Influence of visco-elasticity on the stress development induced by alkali-silica reaction

Karen Scrivener, Cyrille Dunant, Alain Benjamin Giorla

The alkali-silica reaction causes long-term degradation in the microstructure of affected concrete as well as macroscopic expansion. In this paper, a micro-mechanical model based upon an explicit representation of the microstructure has been used to simula ...

Pergamon-Elsevier Science Ltd2015

Fatigue Response of Solvent-Based Self-Healing Smart Materials

Véronique Michaud, Sam Neuser

We investigated the healing of epoxy resins with embedded ethyl phenylacetate (EPA) solvent loaded capsules and shape memory alloy (SMA) wires under fatigue loading in tapered double cantilever beam (TDCB) mode. Under cyclic loading, the kinetics of solven ...

Springer Verlag2014

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

Vibration-based characterization of impact induced delamination in composite plates using embedded FBG sensors and numerical modelling

John Botsis, Joël Cugnoni, Jeannot Frieden

Dynamic strain signals from embedded fiber Bragg grating sensors are used for experimental modal analysis in carbon fiber reinforced polymer plates. Throughout a series of impact tests, the change of eigen-frequencies due to damage is evaluated for differe ...

2011

Impact Load Measurements in an Erosive Cavitating Flow

Ayat Karimi, Jean-Pierre Franc

Impact load measurements were carried out in a high-speed cavitation loop by means of a conventional pressure sensor flush-mounted in the region of closure of the cavity where maximum damage was observed. The sensor was dynamically calibrated by the ball d ...

2011

Probabilistic fatigue analysis of a post-weld treated tubular bridge

Alain Nussbaumer, Scott Walbridge

In this paper, several probabilistic models for evaluating the fatigue performance of post-weld treated tubular bridge structures are briefly described. The application of the models is then demonstrated on a full-scale example bridge. Under realistic traf ...

2006

Residual stress characterization in a single fibre composite specimen by using FBG sensor and the OLCR technique

Fabiano Colpo

The purpose of this thesis is to characterize internal strains in polymeric materials due to consolidation. In view of this, optical Fiber Bragg Grating sensors are an excellent non-destructive tool for internal strain characterization and damage detection ...

EPFL2006