Internal Stresses in Aluminum Engines. Neutrons. DRSA Inreach. Measuring Residual Stresses. Introduction of research project Solidification of casting alloys Stresses and strains Crystal lattices Diffraction Neutrons Experimental design Data Analysis of data. - PowerPoint PPT Presentation
INTRODUCTION TO THE DRSA Inreach - 2012
DRSA Inreach
Internal Stresses in Aluminum Engines Neutrons1Introduction of
research projectSolidification of casting alloysStresses and
strainsCrystal latticesDiffractionNeutronsExperimental
designDataAnalysis of dataMeasuring Residual StressesWavelength
about 2 Go through several cm of AlWhat Waves Will We Use
LightWrong wavelength, absorbedX-raysWavelength OK, strongly
absorbedElectronsWavelength OK, very strongly absorbed (penetrate
less than a mm)NeutronsWavelength OK, able to pass through many cm
of AlWe chose neutrons
Possible WavesWhat is a Neutron?Subatomic particleDiscovered in
1932Electrically neutralWith protons, they form nucleiStable in the
nucleusUnstable when free, half-life 10 minutes and 11 seconds when
free, beta decay (neutron turns into a proton, electron and
electron antineutrino)Able to penetrate matter because electrically
neutralAbout the same mass as a proton
NRU ReactorWhat makes the Reactor Go?Fuel is metallic composite
containing uranium enriched in U235U235 is a fissile isotope of
uraniumSo what does fissile mean?
What makes the Reactor Go?So answer the question, what makes the
reactor go?A chain reaction
What makes the Reactor Go?Then whats all the water in there
for?Neutrons ejected from fission are going too fast for U235
nuclei to capture them.The water slows them down.
McMaster Reactor
MonochromationBraggs Law
ReactorSample
Diffraction
how do we design an experiment using neutronsNext Week
