A new form of equivalent stress for combined axial–torsional loading considering the tension–compression asymmetry of polymeric materials

What is it about?

Although the von Mises equivalent stress has been generally adopted, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials such as polymeric materials. This work proposes a new form of equivalent stress in which the tensile and compressive yield strengths are presented. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions.

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Why is it important?

The proposed form of equivalent stress is important for designing stress-controlled combined axial–torsional loading experiments for the material with the tension–compression asymmetry.