Ductile Behavior

1 case · 11 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: Modified Detail focus: Damage clear all

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Macroscopic view of the fracture in the pipe body. In the bottom of the figure, the fracture of the pipe shows a thicker thickness, revealing that this is the pipe region that was first damaged by bending (buckling). In the top of the figure, the fracture shows a (ductile) shearing mechanism and the thickness is thinner, as will be better observed in the macrography.
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 - Aspect Before AnalysisDf - Fracture

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, 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
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
Macrography of a longitudinal section of the pipe at the fracture position, in the thinner thickness. The external side of the pipe (OD) is to the left side of the figure, and the internal side of the pipe is to the rigth of the figure. The fracture occurred by shearing the pipe in a single event (probably due to tensile stresses during removal).
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 - Ductile Fracture
Macrographic detail of the longitudinal section of the pipe at the fracture position, in the thicker thickness. The several secondary cracks, opened to the OD, were created during bending and shows evidences of compression, responsible for the increase in the pipe thickness.
33
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 - Ductile Fracture
Micrography of the longitudinal section of the pipe, at the thicker part of the fracture, showing several secondary cracks opened to the external side of the pipe. There are no problems in the material structure and the cracks are associated to large plastic deformation.
36
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 - Ductile Crack

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