Tensile Test Post-Laboratory Dr. Ken Lulay EGR270 Spring 2009.

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Presentation transcript:

Tensile Test Post-Laboratory Dr. Ken Lulay EGR270 Spring 2009

Tensile Testing Uniaxial test Record force (  =F/A 0 ) and strain Important mechanical properties Yield strength (  ys or  yp ) Yield strength (  ys or  yp ) Tensile strength (  UT ) Tensile strength (  UT ) Modulus of Elasticity (E) Modulus of Elasticity (E) Ductility (%EL and %AR) Ductility (%EL and %AR)

Materials Tested 2024-T351 aluminum alloy AISI 1045 hot rolled steel UHMW-PE (polyethylene) Acrylic AISI 1045 CF, 1018CF and 4140CF provided

Unload/reload “Blips” are due to changes in load rate (many polymers are very rate sensitive) Necking extends

Extensometer removed, Cross-heads stopped Unload/reload Load rate increased

Young’s modulus of steel: 30Mpsi, of aluminum alloys: 10Mpsi Density of aluminum is about 1/3 that of steel

Tensile Strength Fracture Stress

Conclusions Stress-strain data was recorded for five materials Basic mechanical properties were determined Did mechanical properties meet or exceed specifications?

Recommendations Additional testing could include: Hardness Hardness Charpy impact toughness Charpy impact toughness Chemical composition Chemical composition

QUESTIONS?