Structural Stresses 8 th Grade Industrial Technology Structural

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Structural Stresses 8 th Grade Industrial Technology Structural Stresses

Structural Stresses 8 th Grade Industrial Technology Structural Stresses

Objective § To identify the four structural stresses as they act on structures Compression

Objective § To identify the four structural stresses as they act on structures Compression Torsion Tension Shearing Structural Stresses

Click to Select a Specific Stress Structural Stresses Table of Contents § Compression §

Click to Select a Specific Stress Structural Stresses Table of Contents § Compression § Tension § Torsion § Shearing Structural Stresses

Compression Definition § Forces that cause material to be pushed together § Causes materials

Compression Definition § Forces that cause material to be pushed together § Causes materials to buckle Structural Stresses Back to Table of Contents

Compression Example Structural Stresses Click here then select squeezing force

Compression Example Structural Stresses Click here then select squeezing force

Tension Definition § Forces that cause material to be pulled apart § Tension causes

Tension Definition § Forces that cause material to be pulled apart § Tension causes materials to snap Structural Stresses Back to Table of Contents

Tension Example Tension § Cables are under tension stress Structural Stresses Click here then

Tension Example Tension § Cables are under tension stress Structural Stresses Click here then select stretching force

Torsion Definition § A force that causes materials to twist and bend Structural Stresses

Torsion Definition § A force that causes materials to twist and bend Structural Stresses Back to Table of Contents

Torsion Stress in Action Tacoma Narrows Bridge in high wind before it collapsed (click

Torsion Stress in Action Tacoma Narrows Bridge in high wind before it collapsed (click below for video) Structural Stresses Click here then select twisting force

Shear Definition § A stress that causes materials to tear or slide by each

Shear Definition § A stress that causes materials to tear or slide by each other Structural Stresses Back to Table of Contents

Shear Example § Shear stress causes materials to tear apart Structural Stresses Click here

Shear Example § Shear stress causes materials to tear apart Structural Stresses Click here then select sliding force

Review Table Stress Picture Description Tension Pulling Compression Pushing Torsion Twisting Shearing Sliding Structural

Review Table Stress Picture Description Tension Pulling Compression Pushing Torsion Twisting Shearing Sliding Structural Stresses

Structural Stresses Question § Which type of stress would you apply to your pencil

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

Structural Stresses Answer § Shear stress would be the easiest stress you could apply

Structural Stresses Answer § Shear stress would be the easiest stress you could apply to break your pencil § A pencil would require larger amounts of compression, tension, or torsion than could be applied by hand. Structural Stresses

Resource § Brusic, S. , Fales, J. , & Kuetemyer, V. (2004). Technology today

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