An analyse simulation for single pore closure in hot cylinder ingots;

The stress and strain distribution and evolution during pore deformation are analyzed and various factors influencing the pore closure and welding are examined.

According to the simulation results,the main factors influencing pore closure and their functions are analyzed,and a regression formula for calculating the critical reduction is established by taking into account the influencing pattern of every main factor.

The law of void evolution, criterion of void closure and factors which affect void closure are revealed in this paper.

Infinite hydraulic stress or equivalent strain is required when Gurson Model is employed to realize void closure of materials.

Based on an approximate interpolation scheme,an analytical model for void closure in nonlinear plastic materials was established.

The effects of friction condition on closing the hole has also been investigated.

It involves components of supercavitating weapon and special requirement of each component, schemes of body stabilization in supercavity and the added mass ou supercavitating bodies,cavity stability and instability mechanisms,theoretical schemes of cavity closure,and hydrodynamic forces of body in supercavity .