Human performance

1.

What are main strength and Strain material parameters characterising    material performance during at Tensile loading?

-Young’s modulus

-Yield strength,

-Elongation

-Reduction in area

-Ultimate tensile strength

-Fracture strength

2.What equations describe the Strain hardening stage on true stress- true strain curve above yield strength And before reaching the necking?

-Holomon equation

-Ramberg-Osgood equation

3.What is Hall -Petch equation And what is the meaning of the main parameters in this equation?

-correlating the material Behaviour with yield strength

-Decreasing the grain size, increase the yield strength

-Increasing s_i (Stress acting against Dislocation movement), increase  the Yield strength.

4.What are main mechanical testes Applicable for strength characteristic determination for ceramics?

-Tensile test

-Flexural tests (not the same strength values)

-Ring on ring test

5.What are external factors Affecting the brittle fracture (generally fracture mechanisms) of structural Steels?

-Loading conditions: temperature, load ratio, component Geometry (stress state, notches presence)

6.What are internal factors Affecting the brittle fracture (generally fracture mechanisms) of structural Steels?

-Steel microstructure (Chemical composition, grain size, Effect of other microstructure constituents)

7.What is effect of carbon and manganese on transition temperatures Shift of structural ferritic steels?

-%Mg      = Incerase energy absorption, transition Temperature

-% C        = Decrease energy absorption, Transition temperature

8.What transition temperatures Follow from charpy type test and/or temperature dependence of impact energy?

-FATT(t_50%)

-T27

-DBTT