STRESS AND STRAIN CONCENTRATION AT A CIRCULAR HOLE IN AN INFINITE PLATE

摘要

The theory of elasticity shows that the maximum stress at a circular hole in an infinite plate in tension is three times the appliednstress when the material remains elastic. The effect of plasticity of the material is to lower this ratio. The stress concentration factor is approximately where (Es)a π/2 is the secant modulus at the point of maximum stress and (Eg) is the secant modulus at points far removed from the hole, where the stress is applied. This relation must be solved by trial and error. Values of stress concentration obtained from the formula are in good agreement with limited tests on 24S-T3 aluminum-alloy tension panels. The strain concentration factor determined at the same time is also in agreement with these tests.