and ultimate strength 
. Most
metals are considered isotropic. In contrast fibrous materials,
such as wood, typically have properties that are directionaly
dependant and are generally considered anisotropic (not
isotropic).A beam element has the same mechanical and physical properties
in all directions, i.e., they are independent of direction. For
instance, cutting out three tensile test specimens, one in the x-direction,
one in the y-direction and the other oriented 45 degrees
in the x-y plane, a tension test on each
specimen, will result in the same value for the modulus of
elasticity (E), yield strength and ultimate strength . Most
metals are considered isotropic. In contrast fibrous materials,
such as wood, typically have properties that are directionaly
dependant and are generally considered anisotropic (not
isotropic).