Concept

Damage tolerance

Publications associées (51)

Atomic mechanism and prediction of hydrogen embrittlement in iron

Hydrogen embrittlement in metals has posed a serious obstacle to designing strong and reliable structural materials for many decades, and predictive physical mechanisms still do not exist. Here, a new H embrittlement mechanism operating at the atomic scale ...

Nature Publishing Group2013

Simultaneous Vehicle Crossing Effects on Fatigue Damage Equivalence Factors for North American Roadway Bridges

Alain Nussbaumer, Scott Walbridge, Nariman Maddah, Vincent Fischer

In many design codes for roadway bridges, fatigue design involves passing a load model over an influence line for a critical location on the bridge and then determining the resulting nominal stress range. For fatigue design in the finite-life domain, this ...

American Society of Civil Engineers2013

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

John Botsis, Joël Cugnoni, 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

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

Ermüdungssicherheit von Brücken – Teil 2: Nachweis basierend auf den Messwerten des Monitoring-Projekts „Bahnbrücke Eglisau“

Eugen Brühwiler, Senta Haldimann

Bei der genieteten Rheinbrücke in Eglisau wurde über einen Zeitraum von einem Jahr ein Monitoring durchgeführt. Die mittels Rainflow-Analyse ausgewerteten Messwerte dienten als Grundlage für den Nachweis der Ermüdungssicherheit. Die Messquerschnitte sind i ...

2012

Fatigue safety of riveted bridges - Part 2: Verification based on the monitoring data of the project "Railway Bridge at Eglisau"

Senta Haldimann

Fatigue safety of riveted bridges Part 2: Verification based on the monitoring data of the project "Railway Bridge at Eglisau". Long term monitoring over one year has been conducted on the riveted Railway Bridge over the Rhine at Eglisau. Measured values w ...

Wiley-Blackwell2012

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

Fatigue Life Prediction of Composites and Composite Structures, 1st Edition

The use of composites is growing in structural applications in many industries including aerospace, marine, wind turbine and civil engineering. There are uncertainties about the long term performance of these composites and how they will perform under cycl ...

Woodhead Publishing2010

Residual stress effects in tubular K-joints crack growth

Alain Nussbaumer, Claire Acevedo

Seeking light and transparent bridge designs, engineers and architects have found an efficient and artistic way to fulfill their requirements: steel tubular bridges. Like any other welded structure, the joints of this kind of bridge suffer from high tensil ...

EPFL2010

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