Question

The stress σ in a truss element is given by ____

(a) σ=E

(b) σ=ε

(c) σ=Eeε

(d) σ=α

I got this question in an interview for internship.

Asked question is from Plane Trusses topic in section Trusses of Finite Element Method

Answer 1

The correct choice is (c) σ=Eeε

For explanation I would say: Stress is a physical quantity that expresses the internal forces that neighboring the particles of a continuous material exert on each other. Expression for element stresses can be obtained by noting that a truss element in local co-ordinates is simple two- force member.