Effect of Residual Stresses on the Failure of Laser Cladded Rail

Dr Aditya Narayanan, Research Associate

21 September 2016

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Objectives• Measure residual stresses

after laser cladding• Determine the effect of

residual stresses on fracture of rail

• Develop FE model to simulate laser cladding process and predict how parameters influence stress state

2

Rail joint

Cladded rail

Above: Section of cladded rail near an insulated rail joint; joint consists of electrical insulator and is used for signalling (ruler shown for scale)

Residual Stresses in Rail Samples

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Left: 0.5 m length of cladded rail (martensitic clad on rail steel) set up for neutron diffraction on translatable stage

Above: Schematic of strain directions obtained using this experimental arrangement

Rail

Stage

Neutron detectors

Incident beam (thick arrow)

εzzεyy

Diffracted beam (thin arrows)

Detector