Mechanics-experimental researches on pipe unstable deformation under external pressure

It is a practical and efficient method to research the mechanism of pipe deformation under external pressure by means of pipe collapse-experiments. This article descripts pipe deformation experimental principles include the installations, experimental techniques, and experimental procedures and so on. The methods accord with the actual process of pipe deformation and particularly are propitious to record the test data and observe the processes of pipe deformation. It is very easy to record the test data and adjust the experimental methods. By the experimental data the factors influencing the pipe deformations under external pressure are analyzed and compared with present API theoretical methods, the results from the analysis are importance of which research the mechanism of pipe in failure of collapse deformation.