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EngineeringMechanics

20xx-x-xModule10LearningOutcomesDefine/DiscussMaterialPropertiesassociatedwithStress-StrainDiagramsDefineHooke’sLawNormalStress-StrainDiagram

Material

PropertiesStiffness:

E=

Modulus

of

Elasticity=Young’s

ModulusHooke’s

Law(validfor

linearelasticregion):σ=

EεNormalStress-StrainDiagram

Strength:Capacityforhighstress/ultimatestressToughness:Capacityforenergyabsorption(areaunderstress-straincurve)Resilience:Capacityfordeformingelastically

(areaunderelastic

region)Ductility:Capacityforhighdeformation/strainBrittleness:Lowcapacityfordeformation/strainWorksheet

Worksheet

No.Question1What

istheapproximate

Modulusof

Elasticityfor

A36

Steel?2What

istheapproximate

UltimateStrength

ofA36

Steel?3What

istheapproximate

UltimateStrengthof

6061-T6

Aluminum?4What

istheapproximate

Proportional

Limitofthe

common

MagnesiumAlloy?5What

istheapproximateYieldStress

ofthe

A36

Steel?6Which

ofthese

material

isthestrongest?Why?Aluminumor

Magnesium7Which

isthe

mostductile

material?Why?SteelorAluminum

or

Magnesium8Which

isthe

most

brittle

material?Why?SteelorAluminum

or

Magnesium9Which

material

isthestiffest?

Why?SteelorAluminum

orMagnesiumWorksheetsolution

No.QuestionAnswer1What

istheapproximate

Modulusof

Elasticityfor

A36

Steel?200GPa2What

istheapproximate

UltimateStrength

ofA36

Steel?400MPa3What

istheapproximate

UltimateStrengthof

6061-T6

Aluminum?310MPa4What

istheapproximate

Proportional

Limitofthe

common

MagnesiumAlloy?125MPa5What

istheapproximateYieldStress

ofthe

A36

Steel?250MPa6Which

ofthese

material

isthestrongest?HighestUltimateUtressAluminumor

Magnesium7Which

isthe

mostductile

material?HighestESteelorAluminum

or

Magnesium8Which

isthe

most

brittle

material?LowestESteelorAluminum

or

Magnesium9Which

material

isthestiffest?

HighestESteelorAluminum

orMagnesium

InternalForcesduetoExternalLoads AxialCentricLoads NormalStressandShearStress GeneralStateofStressataPoint(3D) PlaneStress(2D) NormalStrainandShearStrain Stress-StrainDiagrams MechanicalPropertiesofMaterials LinearElasticBehavior,Hooke’sLaw,andPoisson’sRatio StressesonInclinedPlanes PrincipalStressesandMaxShearStress StressConcentrations StrainTransformation GeneralizedHooke’sLawforIsotropicMaterials FactorofSafetyandAllowableStresses/Loads NonlinearBehaviorandPlasticity StaticallyIndeterminateStructures ThermalandPre-strainEffectsVibrationandshipvibrationEngineeringMechanics

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