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Beam deflection Test ProcedureBeam deflection Test Procedure

Mechanics of Materials Lab, CIVL 3325October, 27, 2011

Bending Stress TestBending Stress Testσ

E

ε

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Deflection of a Cantilever Beam:Deflection of a Cantilever Beam:

3PL3EI

3

1

PL

constant b:3

1

1 1E

I h

DeflectionDeflectionP

E

(3I/L3) δ

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ApparatusApparatusDial gauge ClampSpecimen

Main barLoading hanger Bearing

ApparatusApparatus

ClClamp

Force transmission element

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ApparatusApparatus

Group I Group III Group II

Malmi Beal Cody Baker

Overton Bridges Clint BakerOverton Bridges Clint Baker

Thomas McAnally Owens

Syverson Gafferd Parrish

Ford Mariano W. Apperson

Ellis DePriest Morgan

A. Apperson Elzey Brasher

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Group IGroup I

Various Lengths (same material and h)

φ ~ L3

Group IGroup I

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Group IIIGroup III

Various materials (same L and h)

δ ~ 1/E

Group IIIGroup III

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Group IIGroup II

Various sections (same material and L)

δ ~ 1/h3

Group IIGroup II

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PlotsPlots

A

Plot A-B data for three C values on the same plot:

A

B

C1

C2

C3