The measured results shows that the damage of the bit body was mainly caused by tangentialstress.
测定结果表明，钎头体主要是由切向应力引起账裤破坏。
2
The results show that opening point, opening angle, maximal tangentialstress and critical load vary with aspect ratio and inclined angle. The most dangerous inclined angle is obtained accordingly.
The proposed finite difference boundary condition expands the scope of application of FDTD to scattering problems of objects with a finite acoustic impedance but without tangentialstress.