Structural StressesStructural Stresses

Structural StressesStructural Stresses

88thth Grade Industrial Technology Grade Industrial Technology

Structural StressesStructural Stresses

ObjectiveObjective

To identify the four structural stresses as To identify the four structural stresses as they act on structuresthey act on structures

Compression

Tension

Torsion

Shearing

Structural StressesStructural Stresses

Structural StressesStructural StressesTable of ContentsTable of Contents

CompressionCompression

TensionTension

TorsionTorsion

ShearingShearing

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Sp

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Structural StressesStructural Stresses

Compression DefinitionCompression Definition

Forces that cause material to be pushed Forces that cause material to be pushed togethertogether

Causes materials to buckleCauses materials to buckle

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Structural StressesStructural Stresses

Compression ExampleCompression Example

Click here then select squeezing force

Structural StressesStructural Stresses

Tension Tension DefinitionDefinition

Forces that cause material to be pulled apartForces that cause material to be pulled apart

Tension causes materials to snapTension causes materials to snap

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Structural StressesStructural Stresses

Tension ExampleTension Example

Cables are under tension stressCables are under tension stress

Tension

Tension

Click here then select stretching force

Structural StressesStructural Stresses

Torsion DefinitionTorsion Definition

A force that causes materials to twist and bendA force that causes materials to twist and bend

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Structural StressesStructural Stresses

Torsion Stress in ActionTorsion Stress in Action

Tacoma Narrows Bridge in high wind before it collapsed (click below for video)

Click here then select twisting force

Structural StressesStructural Stresses

Shear DefinitionShear Definition

A stress that causes materials to tear or slide A stress that causes materials to tear or slide by each other by each other

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Structural StressesStructural Stresses

Shear ExampleShear Example

Shear stress causes materials to tear apartShear stress causes materials to tear apart

Click here then select sliding force

Structural StressesStructural Stresses

Review TableReview Table

StressStress PicturePicture DescriptionDescription

TensionTension PullingPulling

CompressionCompression PushingPushing

TorsionTorsion TwistingTwisting

ShearingShearing SlidingSliding

Structural StressesStructural Stresses

Structural Stresses QuestionStructural Stresses Question

Which type of stress would you apply to Which type of stress would you apply to your pencil if you wanted it to break it? your pencil if you wanted it to break it? Why would you choose this stress?Why would you choose this stress?

Structural StressesStructural Stresses

Structural Stresses AnswerStructural Stresses Answer

Shear stressShear stress Shear stress would be the easiest stress Shear stress would be the easiest stress

you could apply to break your pencilyou could apply to break your pencil A pencil would require larger amounts of A pencil would require larger amounts of

compression, tension, or torsion than compression, tension, or torsion than could be applied by hand.could be applied by hand.

Structural StressesStructural Stresses

ResourceResource

Brusic, S., Fales, J., & Kuetemyer, V. Brusic, S., Fales, J., & Kuetemyer, V. (2004). (2004). Technology today and tommorowTechnology today and tommorow. . New York: Glencoe. New York: Glencoe.