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The element body force vector f^e is given by _____

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The element body force vector f^e is given by _____

(a) Co-ordinates

(b) f^e=\(\frac{2Πr̅A_e}{3}\)[f̅r,f̅z,f̅r,f̅z,f̅r,f̅z]^T

(c) f^e=\(\frac{2Πr̅A_e}{3}\)[f̅x,f̅y]^T

(d) f^e=\(\frac{2Πr̅A_e}{3}\)

I have been asked this question in unit test.

This interesting question is from Finite Element Modelling topic in division Axis Symmetric Solids Subjected to Axis Symmetric Loading of Finite Element Method

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The correct choice is (b) f^e=\(\frac{2Πr̅A_e}{3}\)[f̅r,f̅z,f̅r,f̅z,f̅r,f̅z]^T

Explanation: A body force is a force that acts throughout the volume of a body. Forces due to gravity, electric fields and magnetic fields are examples of body forces. Body forces contrast with contact forces or the classical definition of surface forces which are exerted to the surface of an object.

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