Transition structures in grass covered slopes of primary flood defences tested with the wave impact generator

The stability of grass covered slopes on primary flood defences under wave attack is an important aspect with respect to the strength of the entire dike. In a grass slope many transitions to objects (poles, stairs, fences, buildings et cetera) or other revetments (concrete, asphalt, placed block revetment) can be present. This can potentially...

Notitie onderzoek asfaltdijkbekledingen 2012-2015

Ontwikkelingen van asfaltdijkbekledingen zijn: • Onverwachte snelle degradatie van oudere asfaltdijkbekleding. Circa 300 km asfaltdijkbekleding is ouder dan 30 jaar. Hiervan blijkt een deel onverwacht snel te kunnen degraderen. Het huidige beheer, toetsregels en inspecties brengen deze snelle achteruitgang niet of niet goed in kaart. Ook...

Dijkbekledingen van GeoCrete, ontwerpmethodiek voor GeoCrete

Het projectbureau Zeeweringen tracht in voorkomende gevallen maatwerk te leveren waar het betreft alternatieve typen dijkbekledingen. In dit kader is ook een middels GeoCrete versterkte bekleding nader onderzocht. In het voorliggende rapport wordt de ontwerprelatie tussen laagdikte en toelaatbare golfhoogte voor dit type dijkbekleding afgeleid.

NLR experience with high velocity burner rig testing 1979-1989

The NLR has two high velocity burner rigs for oxidation and hot corrosion testing. A large, custom-built rig was commissioned in 1977 to enable actual components to be tested. A smaller rig for specimen testing was purchased in 1986. Experience with these rigs over the last decade is reviewed.

Performance of high temperature coatings on F100 turbine blades under simulated service conditions

The performance of various pack, gas phase, noble metal aluminide and overlay coatings, applied on FlOO 1st stage turbine blades, was determined in a 300 hours simulated service test in the NLR high temperature burner rig using flight-by-flight test conditions. An estimate of relative coating life and ranking, based on these particular blade...

TURBISTAN: A standard load sequence for aircraft engine discs

The development of TURBISTAN is a joint international effort to derive a loading standard representative for fighter aircraft engine disc usage. A representative loading standard offers considerable potential advantages over the present zero-max type of loading used for disc material evaluation. This is because the standard incorporates the...

AGARD cooperative test programme on titanium alloy engine disc material

In recent years a strong interest in the application of damage tolerance techniques for llfing of gas turbine engine discs has developed. Before the damage tolerance approach can be safely implemented it requires sensitive and reliable crack detection techniques, operational loading information and improved knowledge of fatigue crack growth and...

Operating conditions and materials selection and development in gas turbines

This paper consists of two parts. In the first part, concerning operational conditions in gas turbines, the following topics are covered: - the magnitude of temperatures, temperature profiles, and stresses in various components - transient temperature conditions, occuring as a result of e.g. throttle setting changes and affecting thermal fatigue...