What is a self-enhanced processing system?
Increasing the wall thickness of the container can increase the load carrying capacity of the container to a certain extent. However, for high-pressure, ultra-high pressure vessels, as the working pressure increases, the infinite increase in wall thickness will make the stress distribution on the vessel wall more uneven. Moreover, when the working pressure in the container is greater than 0.58 σs, increasing the wall thickness does not prevent the yield of the inner wall. In addition, the increase in wall thickness undoubtedly increases the difficulty of material consumption and processing. Therefore, the method of improving the elastic load carrying capacity of the high-pressure and ultra-high-pressure vessels and immediately and effectively is to pre-stress the walls.
Self-strengthening is the application of high pressure on the inner wall of the cylinder, yielding the inner wall, producing a radially enlarged residual deformation, and then removing the pressure. At this time, due to the elastic contraction of the outer layer material, the inner layer material which has been plastically deformed is subjected to compressive stress after elastic recovery, and a method of obtaining residual compressive stress is obtained. The thickness of the inner wall of a thick-walled cylinder is greater than that of the outer wall when subjected to an internal pressure load. When the inner wall yields, the outer layer of the cylinder still has a considerable elastic load carrying capacity. If the inner layer material is first yielded by hydraulic method or mechanical pressing method on the inner wall before work, the residual material expands to form elastoplastic shape, and the inner layer is subjected to compression prestressing after unloading, and the outer layer is subjected to tensile prestressing. The stress on the inner wall will be reduced when the pressure load is re-loaded after work, while the stress on the outer wall is increased, the difference in the stress between the inner and outer layers is reduced, and the unevenness of the stress distribution is improved, and the inner wall is yielded after being repressurized. The pressure is increased (Figure 4-13). Self-energization does not increase the burst pressure of thick-walled cylinders. Since the inner wall obtains residual compressive stress, the ability of the inner wall material to resist fatigue damage can be improved, which is beneficial to improve the fatigue life.
The self-reinforcing process generally has the outer wall strain as the control variable, corresponding to each circumferential strain, which indicates the degree of plastic deformation of the cylinder, and determines the corresponding elastoplastic interface radius.
The biggest advantage of the self-reinforced container is that after the internal pressure is applied, the stress of the inner wall with the largest stress is reduced, the stress distribution becomes uniform, the entire stress is maintained within the elastic range, the elastic operation range is expanded, and the elastic load bearing capacity is improved.
Another outstanding advantage of the self-reinforced container is that there is a compressive residual stress on the inner wall, which reduces the average stress of the inner wall during operation and significantly increases the fatigue strength.
Self-reinforced technology has become an important method for the design of ultra-high pressure vessels. As a pressure treatment technology, self-reinforcing can also be used in the manufacture of general pressure vessels. The purpose is to reduce the thickness of the wall and save material due to the improvement of the elastic bearing capacity; or to replace the use with a lower strength material to reduce the production cost of the product.
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Label: What is a self-enhanced processing system?
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