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- Understanding the internal mechanism

Hi everybody,

Poisson's ratio determine that when applying force in one direction (let say z direction) it would cause a relative major strain at that direction, and also two additional strains at the two other directions (x & y).

My question is, what is the explanation for the change in the body measurements ( shrink at x & y directions) when no external loads applied on these directions? In other words, what causes the material to move and change x-y dimentions? Also, when we look in the cross sections we find only the internal normal stress caused by the external force (z dir.) but no other internal stresses at the other (x & y) dir's.

If there is an 2 or 3 dim. detailed engineering example that can illustrate the use of posson's ratio i'll appreciate that.

Poisson's ratio determine that when applying force in one direction (let say z direction) it would cause a relative major strain at that direction, and also two additional strains at the two other directions (x & y).

My question is, what is the explanation for the change in the body measurements ( shrink at x & y directions) when no external loads applied on these directions? In other words, what causes the material to move and change x-y dimentions? Also, when we look in the cross sections we find only the internal normal stress caused by the external force (z dir.) but no other internal stresses at the other (x & y) dir's.

If there is an 2 or 3 dim. detailed engineering example that can illustrate the use of posson's ratio i'll appreciate that.