Experimental investigation on thickness changes during necking process

Through experimental study of necking process,thickness changes and maximum axial stress during the process were investigated.Different necking coefficients were achieved by using tubes of different diameters.In the experimental study,thickness changes in deformation zone were analyzed,especially for the final thickness changes.The maximum necking force and the limit necking coefficient were investigated.The results of experimental study and calculation were compared to verify the accuracy of calculated results.It shows that the calculation results based on incremental theory is more closer to the experimental results.