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The starting point is a component's plastic flow, i.e. its plastic deformation.
Exceeding the yield point results in plastic flow and thus plastic deformation of the component.
A material's flow stress kf in pascal (Pa, N/m2) is the force F in a uniaxial stress state based on the cross-sectional area (A) that is needed to reach and sustain plastic flow and to achieve permanent deformation.
Mit Überschreitung der Streckgrenze (auch als Fließgrenze bezeichnet) tritt das plastische Fließen und somit die plastische Verformung des Bauteils ein.