Please enable JavaScript.
Coggle requires JavaScript to display documents.
Stress/Strain (Stress (Calculate (Elastic modulus * strain, F / A), Yield…
Stress/Strain
Stress
Calculate
Elastic modulus * strain
F / A
tension = +
compression = -
Proportionality point
end of linear region
Yield point
material would return to a 0.002 0f strain
After this point material cannot go back to its original length anymore
Ultimate Point
Tensile Strength
Maximum stress a material can take
Failure point
fracture
2 phases
crack formation
Crack propagation
Fatigue
#
failure of a material under applied cyclic stress
material will show brittleness even if usually ductile
Improving fatigue
decrease mean load in cyclic strain
change design features
surface treatment
Strain
deltaL / L
Poisson Effect
-Ex / Ez = - Ey / Ez
Elastic Modulus
slope of elastic part of the curve
stress / strain
Creep
Constant stress at elevated temperatures (above .4 Tm)
Improving creep
solid solution alloying
dispersion strengthening
increasing grain size
S-N Curves
They show how many times a certain stress was applied to break a material
Above the curve material failed, below the curve it did not
Ductility
tells how much a material can stretch before it breaks
Resilience
area under the elastic region
Toughness
Area under the whole stress/strain curve
Hardness
resistance to indentation