Question

Difference between elastic & plastic section of modulas

Answer 1

Here is your answer

The elastic section modulus assumes the section remains elastic.  The plastic section modulus assumes the entire section yields.

  For a rectangular section the ratio of plastic section modulus to elastic section modulus is 1.5.  For WF shapes it is around 1.13-1.17.
The plastic section modulus is calculated by first finding the PNA (plastic neutral axis).  This is the axis about which there is an equal amount of AREA above and below.

The next step is to find the centroid of the area above and below the PNA independently.  
Now multiply the total area of the section times the distance between these two centroids

.  Now you have the plastic section modulus.  This for a ductile material like steel.  It is similar for something like a steel beam with a composite concrete slab, but not exactly the same

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Answer 2

plastik is non boidegradable