Dynamic Stress Measurement And Analysis Of A Large Explosion-containment Vessel

Explosion and detonation experiments have the possibility to destroy and pollute the environment, so these kinds of experiments were often taken in the shooting range or explosion tower. It makes inconvenience for us to choose the experiment place, also to observe the process of explosion and detonation in the short range. And the specimens for tests are difficult to recycle.Accompanying with the more and more use of explosion energy in the military and civilian engineering, such as high-energy weapons, explosion weld, explosion processing and composition, and so on, it presses us to operate the explosion and detonation experiments and the recycle the outcomes safely and frequently. Based on this background, the explosion vessel came into being.For the explosion vessels are loaded under relative high working load, so it's very important to make security evaluation for them. This paper adopts both the modal dynamic stress test and finite element simulation to study the dynamic stress respond of the explosion vessel under the structural working load.The main research contents: dynamic stress tests to the modal under 5 working conditions; using the finite element program for static analysis to the structure; using finite element program for numerical simulation to the transient dynamic stress response of the structure under 5 working conditions.1 Taking the covering soil as the structural load, this paper uses the finite element program to analyze the structural strength and distortion properties. The research indicates: under the covering soil condition, the structure's equivalent stress is lower than the design strength of the material. To increase or reduce the thickness of the covering soil makes little affect to the structural strength. And all the stress concentration parts happen on the doorframe, ground beam, etc.2 This paper applies dynamic stress tests to 5 working conditions. The results show: According to the results of the first and the second principal stresses, other than the first time in which the impact stress peak of the spherical shell surface achieved maximum due to blasting, the vibration basically dominated in the form of alternate tensile and compressive stress, which fell below 100 MPa immediately just after 1～2 cycles. The fatigue issue related to vibration could be ignored as a result of the accumulation of soil having eliminated the oscillation of the spherical shell; The strength of the model meets the design requirements; The area showing the most stress concentration is nearby the discharge port.; The shape factor of the explosive has a great influence to the structure safety.3 This paper adopts the finite element program for numerical simulation to the transient dynamic stress response of the structure. The results indicate: the results of numerical simulation and experiments are basically consistent.