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IMPACT TEST

IMPACT TEST. EXPERIMENT # 7 Instructor: M.Yaqub. IMPACT LOAD. Shock load or sudden load is referred as impact load. In order to select a material to withstand sudden intense below, we must measure a material’s resistance to failure in an impact test.

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IMPACT TEST

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  1. IMPACT TEST EXPERIMENT # 7 Instructor: M.Yaqub

  2. IMPACT LOAD • Shock load or sudden load is referred as impact load. • In order to select a material to withstand sudden intense below, we must measure a material’s resistance to failure in an impact test. • The ability to withstand an impact below is referred as toughness of the material.

  3. IMPACT TEST

  4. IMPACT TEST CURVE

  5. RESULT OF IMPACT TEST • From the curve, it is clear at high temperature, a higher amount of energy is required for the fracture. • Here fracture is ductile, means a lot of deformation before the fracture. • At low temperature, a small amount of energy is required for the fracture. • Here fracture is brittle, means a very small (practically no) deformation before the fracture.

  6. DUCTILE TO BRITTLE TRANSITION TEMPERAURE • The fracture mechanism changes from ductile to brittle over a narrow range of temperature. • This temperature is called DUCTILE TO BRITTLE TRANSITION TEMPERATURE (DBTT). • DBTT can be read from the impact test curve as the median temperature of the curve.

  7. MORE ABOUT DBTT • DBTT should be below the working environment temperature for a metal subjected to impact loading condition. • Not all materials have a distinct DBTT. • Usually BBC metals have DBTT while FCC metals don’t.

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