James Marrow Profile
James Marrow

@james_marrow

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My research is focussed on the degradation of structural materials and the role of microstructure.

Oxford University
Joined May 2011
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@james_marrow
James Marrow
7 years
New article from @OxfordMaterials: on in situ study of damage development in a needle-stitched ceramic matrix composites
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@james_marrow
James Marrow
8 years
Using x-ray radiographs @DiamondLightSou to see the crack, which we’ll tomograph in 3D. Here’s one (just a mobile phone photo of the screen!). The sample is 0.5 mm thick, and we’ll grow the crack in steps of 40 um (less than the thickness of a human hair). @OxfordMaterials
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@james_marrow
James Marrow
8 years
Team from @OxfordMaterials back @DiamondLightSou for another experiment on i12. We’re watching how cracks grow between the sheets in carbon-fibre composite for aerospace. We want to know how to make it tougher. Our loading rig (beige cylinder thing) is in front of the camera
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@james_marrow
James Marrow
8 years
Just heard that John Knott ( has passed away. He had a profound effect on my career, and will be greatly missed.
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@james_marrow
James Marrow
8 years
There is a crack, a crack in everything.
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James Marrow
8 years
Very clear report by #HouseofLords on critical need for UK Government decision on the future of #nuclear energy
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@james_marrow
James Marrow
8 years
#RobotWars @DiamondLightSou ?.No, we're investigating the toughness of natural biomaterials with #xray #tomography
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@james_marrow
James Marrow
8 years
New, simple FE-based method to calculate J-integral of a crack from an experimental surface displacement field
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@james_marrow
James Marrow
8 years
Graphite cracking up at 850C. Measuring how it takes the strain with #neutrons and image analysis. @OxfordMaterials @STFC_Matters
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@james_marrow
James Marrow
8 years
#nuclear graphite at 850C, being slow loaded to investigate its strength. The donuts helped! @OxfordMaterials with @STFC_Matters #neutrons
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@james_marrow
James Marrow
8 years
Furnace and neutron source problems. morale dropping?@OxfordMaterials @STFC_Matters. Science is tough, but Donuts could be the solution
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@james_marrow
James Marrow
8 years
RT @DiamondLightSou: ⚡️ “The little crack that could - fatigue testing on I12”.
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@james_marrow
James Marrow
8 years
@mmostafavi1 @DiamondLightSou @james_marrow it's been great to share this unique beamline with @BristolUni team (& Tim from @portsmouthuni).
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@james_marrow
James Marrow
8 years
A quick visualisation of the fatigue crack we've nurtured over the past few days. Now for the analysis! @OxfordMaterials @DiamondLightSou 😫
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@james_marrow
James Marrow
8 years
300000 more fatigue cycles and a bit more load, but we overcame 'closure'. Can you spot the difference?.@OxfordMaterials @DiamondLightSou
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James Marrow
8 years
@mmostafavi1 Not quite, but we've given it 250,000 cycles and it's not budged (yet) - that's the power of fatigue crack closure for you!.
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@james_marrow
James Marrow
8 years
We grew our crack to a good size then reduced load to study "crack closure" retardation. It's stopped growing - or has it? More cycles. .
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@james_marrow
James Marrow
8 years
It moves!! This is the unique rig @OxfordMaterials is using to grow a fatigue crack and record high resolution tomographs @DiamondLightSou
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@james_marrow
James Marrow
8 years
Do you recall the teeny-tiny fatigue crack we tweeted a little while ago? It's grown. @DiamondLightSou @OxfordMaterials
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@james_marrow
James Marrow
8 years
RT @MEx_ESRF: @RockSquasher @DiamondLightSou Have a plan A, a plan A2, A3, Plan B, Plan B2. ! Organise shifts for the team. Oh and coffee.….
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