Describe the five different techniques demonstrated. Background Non-Destructive Testing During the design process great care must be taken...

50.1K

Verified Solution

Question

Civil Engineering

Describe the five different techniques demonstrated.
Background
Non-Destructive Testing During the design process great caremust be taken to match the design to the application. This processinvolves, among others, material selection, material processing,and service condition analysis. As we have found through thematerial outlined in the text a great number of decisions have tobe made during the design process to insure that the product meetsall of the needs of the application. Once a product is produced wemust evaluate its quality to determineio9 if the design issuccessful. Destructive testing will give us some information aboutcomponent properties, but requires the loss of the product. Sometypes of destructive testing can also be impractical for largecomponents. In some instances only a small number of components areactually produced and destruction of any of the parts may be toocostly. Nondestructive techniques are used to evaluate the qualityof components without the sacrifice of the part. These methods canbe used together with fracture toughness information to evaluatewhether flaws will cause crack propagation or can be used tomonitor the growth of cracks that could result in fatigue failure.The simplest nondestructive test method, abbreviated NDT, is avisual inspection. Often this visual inspection can reveal cracksor other flaws such as in welds or castings or other productionproblems.
Many quality problems at the surfacemay be invisible to the naked eye or may exist hidden in theinterior of the component. For these hidden or microscopic flawsother techniques are used.
These techniques include:
Magnetic-ParticleinspectionÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Inductive (eddy current) inspection
Fluorescent-PenetrantinspectionÂ Â Â Â Â Â Â Â Radiographic inspection
Dye PenetrantinspectionÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Acoustic-Emission inspection
Ultrasonic inspection

Answer & Explanation Solved by verified expert

3.8 Ratings (615 Votes)

Describe the five differenttechniques demonstratedBackgroundNonDestructive Testing During thedesign process great care must be taken to match the design to theapplication This process involves among others materialselection material processing and service condition analysis Aswe have found through the material outlined in the text a greatnumber of decisions have to be made during the design process toinsure that the product meets all of the needs of the applicationOnce a product is produced we must evaluate its quality todetermineio9 if the design is successful Destructive testing willgive us some information about component properties but requiresthe loss of the product Some types of destructive testing can alsobe impractical for largecomponents In some instances onlya small number of components are actually produced and destructionof any of the parts may be too costly Nondestructive techniquesare used to evaluate the quality of components without thesacrifice of the part These methods can be used together withfracture toughness information to evaluate whether flaws will causecrack propagation or can be used to monitor the growth of cracksthat could result in fatigue failure The simplest nondestructivetest method abbreviated NDT is a visual inspection Often thisvisual inspection can reveal cracks or other flaws such as in weldsor castings or other production problemsMany quality problems at thesurface may be invisible to the naked eye or may exist hidden inthe interior of the component For these hidden or microscopicflaws other techniques are usedThese techniquesincludeFluorescentPenetrantinspectionDye PenetrantinspectionAcousticEmission inspection1MagneticParticleinspectionMagnetic particleInspection MPI is anondestructive process for detecting surface and shallowsubsurface discontinuities in ferromagnetic materials such as ironnickel cobalt and some of their alloys The process puts amagnetic field into the partThe principle of themethod is that the specimen is magnetised to producemagnetic lines of force or flux in thematerial The most versatile technique is using a 110v AChand held electromagnetic yoke magnet a white strippable paint ascontrast background and a magnetic ink composed of iron powderparticles in a liquid carrier baseThe area is magnetisedwith the yoke magnet In the event of a surface or slightly subsurface defect being present the lines of magnetic force willdeform around the defectThe magnetic ink is applied and theiron powder particles will bridge the gap caused by the defect andgive a visible indication against the white contrastbackgroundMAGNETIC PARTICLEINSPECTION IS PERFORMED IN FOUR STEPSInduce a magnetic field in the specimenApply magnetic particles to the specimens surfaceView the surface looking for particle groupings that arecaused by defectsDemagnetize and clean the specimenADVANTAGES OF MAGNETICPARTICLE INSPECTIONCan find both surface and near subsurface defectsSome inspection formats are extremely portable and lowcostRapid inspection with immediate resultsIndications are visible to the inspector directly on thespecimen surfaceCan detect defects that have been smeared overCan inspect parts with irregular shapes external splinescrankshafts connecting rods See Answer

Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:

Unlimited Question Access with detailed Answers
Zin AI - 3 Million Words
10 Dall-E 3 Images
20 Plot Generations
Conversation with Dialogue Memory
No Ads, Ever!
Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!

Become a Member