An improved semi-analytical solution for stress at round-tip notches

作者：Liu Mingchao; Gan Yixiang^*; Hanaor Dorian A H; Liu Bin; Chen Changqing

来源：Engineering Fracture Mechanics, 2015, 149: 134-143.

DOI：10.1016/j.engfracmech.2015.10.004

• Key-hole notches
• Crack tip blunting
• Stress concentration
• Stress equilibrium
• Failure criterion

In order to investigate the brittle failure of key-hole-notched components, the stress distribution at notch tips is studied numerically and theoretically. A semi-analytical formula is developed for the maximum notch-tip-stress, incorporating crack-tip-blunting, stress-concentration and stress-equilibrium. Stress distributions in notched plates are simulated by the finite-element method, showing improved accuracy of the formula relative to established solutions. Application of the developed equation to components containing U-notches and blunt V-notches, is explored, demonstrating its broad applicability. When combined with stress-based failure criteria, the semi-analytical model can be employed to assess brittle failure in notched components with significance toward fracture in heterogeneous materials.

• 出版日期2015-11
• 单位清华大学