Research Themes

Condition Monitoring

ctw/pt

Condition Monitoring of structurally loaded polymers and composites is of crucial importance in many applications. It provides information about the current status of the material as measured by certain important material parameters.

The condition which limits the lifetime of the structure should be measured in a non-destructive manner if replacement of the test piece is undesired. Furthermore, the structures under investigation are generally difficult to reach with conventional measurement equipment. Therefore part of the research is focussed on in-service monitoring.

Click on the author’s name to obtain more information about the project.

Material characterisation of asbestos cement pipes by ultrasound measurements

2011-2014

STAFF

Vaidotas Cicenas

This research focuses on the identification of a material parameter that can be identified sufficiently accurate by ultrasonic technologies. It must also be possible to assess the condition and the remaining life time of asbestos cement pipes employing this material parameter.

contact

Remko Akkerman, Richard LoenderslootRoy Visser

Partners:

TTI-w Wetsus

Lifetime assessment of uPVC gas and water distribution pipes

2010-2014

Staff

Emiel Drenth

In a previous PhD research project the framework of a non-destructive lifetime assessment method with physical ageing as the predominant factor limiting the lifetime of uPVC pipes was developed. Before the method can be put into practice, the framework has to be extended and refined, putting an emphasis on increasing the resolution of micro-indentation measurements. Furthermore, the research focuses on incorporating the influence of gelation, molecular weight, additives, injection moulding, bi-axial stretching in the existing framework

Contact

Ton BorRoy Visser

Partners:

Cogas, Enexis, Liander, Stedin, Bureauleiding, Delta, Rendo, Vitens

Characterising the lifetime of uPVC water pipes using ultrasound measurements

2010-2013

IMG_1539

Staff

Mahmoud Ravanan

With only a measurement technique the residual lifetime of a structure cannot be determined. A translation between the measurement results and the current and future condition of the structure is required to determine the residual lifetime. This translation step from ultrasound measurements towards the residual lifetime of uPVC pipes is the main focus of this research project. The ultrasound measurement technique itself is under development in a separate research project.



Contact

Remko AkkermanRichard LoenderslootRoy Visser

Partners

TTI-w Wetsus


Vibration based structural health monitoring of composite structures

2009-2013

Staff

Ted Ooijevaar

Vibration based damage identification methods are promising as an alternative for the time consuming and costly Non Destructive Testing methods currently available. These methods also offer the potential to be used in a real-time Structural Health Monitoring system.

Contact

Laurent Warnet

Partners

Cleansky, Fokker, NLR, AgustaWestland, Applied Mechanics Group of the University of Twente.

Key Publications

Ooijevaar, Composite Structures, 2010

InnoWator 

Development of an ultrasound measurement technique to determine the residual lifetime of uPVC water pipes

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2009-2011

Staff

Andriejus Demcenko

Ultrasonic measurement techniques are one of the most frequently used techniques for inspection of engineering structures. In this project a new ultrasonic measurement technique to evaluate the (physical) ageing state and crack growth in uPVC water distribution pipes is developed.

Contact

Remko AkkermanRichard LoenderslootRoy Visser

Partners

Applus Rtd, Vitens.

Lifetime assessment of uPVC gas pipes

2005-2010

Staff

Roy Visser

The consequences of physical ageing limit the lifetime of uPVC gas distribution pipes. The focus of the research project is therefore on the influence of physical ageing on the mechanical behaviour of uPVC gas pipes. The procedure of determining the residual lifetime is based on these findings and is split into four aspects/chapters: the choice for the yield stress as a measure for the condition of the pipe material, characterisation of the change of the yield stress time (its ageing kinetics), determining the critical condition and development of a method of measuring the current condition.

Contact

Roy VisserTon Bor

Partners

Cogas Infra & Beheer BV, Enexis, Liander, Stedin, KWR, Eindhoven University of Technology

Key Publications

Visser, Macromolecular Materials and Engineering, 2010