Reducing pipes stainless concentric reducer are common and important components in pressurized pipeline systems, but research on reducing pipe problems is still largely blank. The stress of concentric reducer, eccentric reducer, and reducer bend under internal pressure, in-plane bending moment, and torque was studied through theoretical analysis, and verified through finite element numerical analysis and experiments.
The main tasks include:
1. Derived the circumferential stress formula and longitudinal stress formula for reducing bends under internal pressure. Under the corresponding structural parameter conditions, the circumferential stress formula for reducing pipes can be transformed into the circumferential stress formula for concentric reducing pipes, eccentric reducing pipes, or equal diameter bending pipes. On this basis, the ultimate pressure formula for reducing pipes was derived. The ultimate internal pressure of the reducer is controlled by its large end section stainless concentric reducer.
2. The formula for the ultimate bending moment of a reducer has been derived, and the ultimate bending moment of the reducer is controlled by its small end section. The ultimate bending moment of concentric and eccentric reducers is equivalent to the ultimate bending moment of a straight pipe with the same cross-sectional size as the small port. The ultimate bending moment of a reducing bend pipe is based on the ultimate bending moment of concentric and eccentric reducing pipes with the same size as the small end face, multiplied by a bending moment coefficient. According to the magnitude of the bending coefficient of the reducing bend pipe, it is divided into four intervals, and the bending moment coefficient is calculated according to the regression equation of the corresponding interval.
3. The formula for the ultimate torque limit of a reducer has been derived, and the ultimate torque of the reducer is controlled by its small end section, which is equivalent to the formula for the ultimate torque of a straight pipe with the same size as the small end section as the basic term, multiplied by a coefficient. The ultimate torque of concentric reducers is slightly higher than that of eccentric reducers, and the ultimate torque of the large end section of the reducer is relatively smaller than that of the small end section. The concept that the torque at one end cannot be fully transmitted to the other end when subjected to end face torque in a reducing bend pipe is also proposed, and the torque will gradually be converted into bending moment during transmission. The bending moment of one end face of a 90 ° bend can be converted from the torque of the other end face.
4. Proposed finite element modeling methods for concentric reducers, eccentric reducers, and reducers stainless concentric reducer.
Summarize the characteristics of stress distribution or deformation:
(1) The phenomenon of relative opening of the large end and relative contraction of the small end caused by the bending moment generated by the area pressure difference between the large and small ends of the concentric reducer under internal pressure;
(2) Under the action of internal pressure, the circumferential stress on the inner surface of the eccentric side of the eccentric reducer at the large end and the outer surface of the eccentric side at the middle is the highest.
The above theoretical achievements have been validated through finite element numerical analysis and experimental verification. The experiment also showed that under internal pressure, the bending radius of the ring shell and the cross-sectional radius of the tube both increased, while the wall thickness of the tube changed very little.
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