Structural elements and components made from ductile materials are generally designed such that the material doesn't
yield under the expected loading condition in service. When the element is in a state of plane stress,
it's convenient to first calculate
principal stresses for the point that is going to be analyzed.
Then following theories of failure calculator for ductile materials can be used to analyze the element against yielding using Maximum Shear Stress Theory and DistortionEnergy Theory
failure criteria. Calculation tool is only valid for ductile material under
static plane stress loading.
The formulas used for the calculations are given in the List of Equations
section.
Theories of Failure Calculator for Ductile Materials:
Note: Use dot "." as decimal seperator.
RESULTS

Parameter 
Condition to be met for safe design 
Status 
MSS theory 






DE theory 
(σmax^2  σmax*σmin + σmin^2)^0.5 < Sy/n





Note: Dot "." in the drawing shall remain inside the polygon for safe design
according to MSS theory and shall remain inside ellipse according to DE theory.
Use design factor included graphs for evaluation.