Question

The principal strains at a point are +800 × ${10}^{-6}$ cm/cm, +400 × ${10}^{-6}$ cm/cm and -1200 × ${10}^{-6}$ cm/cm. The volumetric srain is equal to

• A. +1200 × ${10}^{-6}$ cm/cm
• B. +800 × ${10}^{-6}$ cm/cm
• C. -1200 × ${10}^{-6}$ cm/cm
• D. zero

Answer 1

The correct option is D zero

${\epsilon }_v=800\times {10}^{-6}+400\times {10}^{-6}-1200\times {10}^{-6}=0$