Question

What is the SI unit for the stress of a material?

(a) N

(b) N m

(c) N m^-1

(d) N m^-2

The question was asked by my school principal while I was bunking the class.

I would like to ask this question from Plastic Deformation topic in chapter Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy

Answer 1

The correct option is (d) N m^-2

To explain: Stress is defined as the internal forces acting in a material. The various types of stresses are shear, tensile, yield, and ultimate tensile strength. All these stresses are defined as Newton/meganewton per square meter.