tensiontest.rst

Tension test

.. toctree::
   :maxdepth: 2

   specimens

important Attributes for a tension test [ISO 6892-1:2016(E)]

• ao [mm] ... original thickness of a flat test piece or wall thickness of a tube
• bo [mm] ... original width of the parallel length of a flat test piece or average width of the longitudinal strip taken from a tube or width of flat wire
• do [mm] ... original diameter of the parallel length of a circular test piece, or diameter of round wire or internal diameter of a tube
• Do [mm] ... original external diameter of a tube
• Lo [mm] ... original gauge length
• So [mm²] ... original cross-sectional area of the parallel length
• Su [mm²] ... minimum cross-sectional area after fracture
• A [%] ... percentage elongation after fracture
• Ag [%] ... percentage plastic extension at maximum force, Fm
• Agt [%] ... percentage total extension at maximum force, Fm
• At [%] ... percentage total extension at fracture
• dLm [mm] ... extension at maximum force
• dLf [mm] ... extension at fracture
• Fm [N] ... maximum force
• e.Le [1/s] ... strain rate

References

• TechReport (DIN6892-1) ISO 6892-1:2009, Metallische Werkstoffe – Zugversuch – Teil 1: Prüfverfahren bei Raumtemperatur 2009
• TechReport (DIN6892-2) ISO 6892-2:2009, Metallische Werkstoffe – Zugversuch – Teil 2: Prüfverfahren bei erhöhter Temperatur 2009
• ISO 6892-1:2016(E)
• VDA 238-100 2010:12
• Weißbach, W. Werkstoffkunde und Werkstoffprüfung: Strukturen, Eigenschaften, Prüfung Vieweg, 2007

Brucheinschnürung

Z = \frac{S_o-S_u}{So}

Bruchdehnung

A = \frac{L_u-L_o}{L_o}

Zugfestigkeit

R_m = \frac{F_m}{S_o}

Einschnürung [Semiatin1985, Gerhardt2015]

a: Probenbreite in der Einschnürung R: Krümmungsradius in der Einschnürung

k_{f}=\frac{F}{A_{\min }} \cdot \frac{1}{\sqrt{1+\frac{R}{a}} \cdot \ln \left(1+\frac{a}{2 R}+\sqrt{\frac{a}{R} \cdot\left(1+\frac{a}{4 R}\right)}-1\right)}