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Material Properties

Material Properties. 2142-391 Engineering Mechanical Laboratory AUTOMOTIVE DESIGN AND MANUFACTURING International Program, Chulalongkorn University. Lecturer. Aj. Thanyarat SINGHANART (TSN) Office room : AUTO. Bldg. 2 nd floor, room 213. Brackgrounds. Brackgrounds.

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Material Properties

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  1. Material Properties 2142-391Engineering Mechanical Laboratory AUTOMOTIVE DESIGN AND MANUFACTURING International Program, Chulalongkorn University

  2. Lecturer Aj. Thanyarat SINGHANART (TSN) Office room : AUTO. Bldg. 2nd floor, room 213

  3. Brackgrounds

  4. Brackgrounds Challenger was destroyed in the second minute of STS-51-L, the orbiter's tenth mission, on January 28, 1986, when an O-ring seal on its right solid rocket booster (SRB) failed. The O-rings failed to seal due to a variety factors, including unusually cold temperatures. This failure allowed a plume of flame to leak out of the SRB and impinge on both the external fuel tank (ET) and SRB aft attachment strut. This caused both structural failure of the ET, and the SRB pivoted into the orbiter and ET. The vehicle assembly then broke up under aerodynamic loads.

  5. O-ring “Properties drop in low temperature”

  6. Deformation of Axially-Loaded Member Deformation of Torsion Member Deflection of Beam Buckling Mathematical Models Safety Factor

  7. Objectives • To study how to test the materials for obtaining the desired properties. • Tensile test • Hardness test • Impact test • To study how to evaluate the mechanical properties of the materials. • Etc.（Options) • Can we relate the material properties to applications? • Can we determine the tensile strength from the hardness value? • Can we explain the fracture mechanism of ductile and brittle materials? • etc.

  8. STANDARD : Tensile test

  9. STANDARD : Hardness test

  10. STANDARD : Impact test

  11. Testing Machines • Materials: • Construction Steel • Shaft Steel • Cast Iron • Aluminum • Brass

  12. Stress-Strain Relationship

  13. Data Reduction (Tensile Test) • Young’s Modulus • 0.2% offset Yield Stress • Tensile Strength • % Elongation • % Reduction of Area • Modulus of Resilience • Modulus of toughness • Etc.

  14. Hardness test Materials: - Steel - Steel after hardening process

  15. Impact test Materials: - Steel - Aluminum - Brass

  16. SEE YOU NEXT WEEK

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