8/4/2019 Presentation on Stress Analysis

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PRESENTED BY

AAKASH ARYA AND AMAN ARORA

PRESENTATION ON STRESS ANALYSISPRESENTATION ON STRESS ANALYSIS

DRONACHARYA COLLEGE OF

ENGINEERING

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` Stress analysis is an engineering studythat

determinesthe stressin materials andstructures

subjectedtostaticordynamic forcesor loads

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` A stress analysisis required forthe study anddesign ofstructures, e.g.,tunnels,dams,mechanical parts, andstructural

frames among others,underprescribedor expected loads.

` Stress analysis maybe appliedas a design step tostructures

thatdo notyet exist.

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` The aim ofthe analysisisusuallytodetermine

whetherthe elementorcollection of elements,usually

referredto as a structure,can safely withstandthe

specified forces.

` Thisis achieved when the determinedstress from the

applied force(s)is lessthan the ultimate tensile

strength,ultimate compressive strengthor fatigue

strengththe material is known tobe able to withstand,

thoughordinarily a factorofsafetyis appliedin design.

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MODELLING

EXPERIMENTALTESTING

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` All real objectsoccupya three-dimensionalspace. The stressanalysiscan besimplifiedin caseswhere the physicaldimensions andtheloading conditionsallowsthe structure tobe assumed asone

dimensional ortwo-dimensional andthisprocessiscalledmodelling.

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` Appro imate solutio s for bou dary- alue

problems can be obtained t rou h the use of

numerical methods such as the finiteelementmethod, finite differencemethod and boundery

elementmethod.

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` A stress analysiscan be madeexperimentallyby applyingforcesto a test elementorstructure andthen determiningthe resulting stressusingsensors. In thiscase the processwould more properlybe known

astesting (destructive or non-destructive). Special equipment,such as a windtunnel,hydraulicmechanisms,or weights areusedto applythe staticordynamic loading.

` Experimental determination ofstressescan be carriedoutusing, for example,the photoelastic methodordynamicmechanical analysis.

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` Photo elastic method is anexperimental methodtodetermine stressdistributionin a material.

` The methodis mostlyusedin cases where mathematicalmethodsbecome quitecumbersome.

` The methodserves as animportanttool fordetermining the critical stresspointsin a material andisoften used fordeterminingstressconcentration factorsin irregular geometries.

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` Dynamic Mechanical Analysis is atechnique usedtostudy andcharacterize materials.

` A sinusodial stressis applied andthe strain in the material is

measured, allowing one todetermine the complex modulus.The temperature ofthe sample orthe frequencyofthe stress are oftenvaried, leading to variationsin thecomplex modulus;

` this approachcan be usedto locate

the glasstransition temperature ofthe material, as well astoidentifytransitionscorresponding toothermolecular motions.

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