Why is there a fully plastic section modulus Zfull and a maximum plastic section modulus Zmax displayed for some cross-sections?

Answer

The fully plastic section modulus Zfull is related to the full-plastic bending moment Mpl,full. For Mpl,full, there is only one internal force available in the respective direction. It is not possible to increase this internal force, even if the cross-section is not perfectly plastic.

On the other hand, the maximum plastic bending moment Mpl,max related to the maximum plastic section modulus Zmax refers to the perfectly plastic state of the cross-section. In this case, the interaction of the internal forces in the y- and z-direction is possible.

Keywords

Fully plastic Section modulus Perfectly plastic Plastic Bending moment

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