Question

Virtual displacement field is _____________

(a) K=\(\frac{EA}{l}\)

(b) F=ma

(c) f(x)=y

(d) ф=ф(x)

I have been asked this question at a job interview.

This question is from One Dimensional Problems topic in section One Dimensional Problems of Finite Element Method

Answer 1

The correct option is (d) ф=ф(x)

For explanation I would say: Virtual work is defined as work done by a real force acting through a virtual displacement. Virtual displacement is an assumed infinitesimal change of system coordinates occurring while time is held constant.