Small Rubber Bellow
The stress on the bellows is created by the pressure in the system and the deformation of the bellows. The pressure creates hoop (circumferential) stresses on the bellows, and radial film and bending stresses at the sidewalls, troughs, and crests of the waves. A thin shell that cannot resist bending is sometimes called a membrane, and the stress calculated by ignoring bending is called membrane stress. Radial membrane stress and bending stress are generated when the bellows is deformed.
Product Details
The stress on the bellows is created by the pressure in the system and the deformation of the bellows. The pressure creates hoop (circumferential) stresses on the bellows, and radial film and bending stresses at the sidewalls, troughs, and crests of the waves. A thin shell that cannot resist bending is sometimes called a membrane, and the stress calculated by ignoring bending is called membrane stress. Radial membrane stress and bending stress are generated when the bellows is deformed. When the bellows is working, some are subject to internal pressure and some are subject to external pressure. For example, the bellows of the bellows expansion joints and metal hoses are subject to internal pressure in most cases, while the bellows used for valve stem sealing is generally used. Under external pressure, the stress of bellows under internal pressure is mainly analyzed. The ability of bellows to withstand external pressure is generally higher than that of internal pressure. With the wide application of bellows, people have carried out a lot of analysis, research and experimental verification work on the stress of bellows, and put forward many calculation formulas, calculation programs and charts for engineering design. However, some methods are inconvenient to use due to complicated diagrams or procedures, and some methods assume conditions that are either too simplified or too ideal, and it is difficult to ensure safe and reliable use, and many methods have not been accepted by the engineering community. Therefore, there are very few methods that really meet the practical requirements.
There are two commonly used methods:
1. Numerical calculation of bellows stress
2. American EJMA stress calculation method
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