[HMIS]

Dear Na07,

in such case, you should search and dig for the information for yourself. you are a chemical engineering student!! please realize this.


anyway, first, think about the definitions of these two terms. What is ductility? well, as far as I know, ductility is the ability of the material to deform plastically.
as you may know that you have two different types of deformation; elastic: not permanent, and plastic: permanent. Once the material can deform plastically before it fails or break, then it is said to be ductile.

on the other hand; what is strength? it is nothing but the resistance of the material to the applied force! you should have had an experiment in the llurgy lab that showed you clearly how materials resist tension forces, I guess "tensile test". you should have drawn graphs of the behavior of several materials.

Now, what is the connection between strength and ductility? in production, engineers main focus is to produce materials have high strength but maximum ductility!! it is indeed difficult to have such material!! why? this is because when increase the material strength, it loses some of its ductility! and vice versa.. this is why engineers should optimize between these two parameters.

a clear example of high strength and nearly no ductility (very low ductility) material is tungsten. consider a rod of tungsten and then apply the tensile test to it, if you can recall the tensile test graphs in your lab notes, you will only experience an elastic phase for tungsten then the material fails!!

an example of solid materials with ductility is copper, take copper rod and apply the same test to it, you should observe two phases; elastic and plastic.

what we want as engineers is to have materials with good ductility to avoid sudden failure or fracture.

this is just what I could remember in this topic!! I hate writing here!! I prefer talking instead of that!! anyway, you still can search on the internet for lots of information


best regards

HMIS