Plastic Deformation

1 case · 4 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Product: Drill Pipe clear all

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Macrography of a longitudinal section of the pipe at the fracture position, as ground, showing in the rigth side the thicker thickness and several secondary cracks opened to the external side of the pipe (created during bending), and in the left side the shearing mechanism and the thinner thickness.
39
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Longitudinal Section AspectDf - Plastic Deformation

More from these cases

ML00159 — Collapse of a Drill PipeM - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Macrography of a longitudinal section of the pipe at the fracture position, in the thicker thickness. The external side of the pipe (OD) is to the rigth side of the figure, and the internal side of the pipe is to the left of the figure. There are several secondary cracks, opened to the OD, created during bending.
37
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - NItal Etched MacroDf - Plastic Deformation
Micrographic detail of the ductile secondary cracks in the pipe body, close to the fracture. The strong plastic deformation is associated to the compression stresses generated by the buckling.
27
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
Micrographic detail of sheared pipe, showing strong plastic deformation at the fracture. All the structure is deformed in the direction of the failure shearing.
17
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Plastic Deformation