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How to solve O-ring fracture?


What should I do if the ring is broken? How do you know […]

What should I do if the ring is broken? How do you know that the O-ring is broken? Do you know how to solve this situation?

Visual inspection
The key step of failure analysis is to thoroughly inspect the mechanical damage of the o-shaped gasket. Obviously, all three O-rings are damaged, which will inevitably lead to leakage. Surprisingly, all three O-type errors point to the source of stress, not to stay away from it. However, ignoring other possible causes of failure may lead to ignoring more important factors, leading to the best prevention. In the example in this article, the o-ring did not cause any other mechanical damage. For example, the o-ring does not associate the evidence of crush failure with pressure. When the strength of the material exceeds the strength of the material to withstand the fluid pressure, the rubber will be squeezed into the attachment, in the gap between the "damaged" rubber area . This situation obviously does not exist on this o-shaped washer. And there is no indication that this O-ring has produced any compression of the assembled parts.
In addition, there is no evidence of chemical decomposition or thermal degradation of rubber materials. Unlike other damage points, O-rings have no obvious expansion, hardening, softening, foaming, compression deformation, brittleness or loss of tensile strength. Very simple, compared to other obvious damage. For these reasons, the chemical and thermal incompatibility of these sealants may prove not to be the root cause of failure.

Analyze the fracture
The failure of o-shaped gaskets most often occurs in the process of assembling o-shaped gaskets to meet application requirements. However, in this case, the o-rings passed the initial leak test and were used for several weeks. Damaged o-shaped gaskets are impossible. Therefore, O-rings must be intact during installation and initial pressure testing. This means that in the process of using the gasket, the O-gasket must be damaged, which is a rare condition for being installed in the groove in a static O-ring sealing device. This type of injury usually has one or two causes.
The most common application of O-ring damage is caused by tearing, which spreads from the initial torsion point. In this case, a part of the O-ring seal is crushed in the assembled metal parts, usually by accidentally ejecting the groove during installation. Damaged O-rings can show obvious signs of mechanical damage, including: some are severely crushed, O-rings are missing parts, except that the cross section is a semicircle, and so on. In some cases, a compact period will damage the O-ring using the initial leak test, which is due to the shrinkage of the initial sealing rubber ring. However, there is no evidence of any shrinkage of these malfunctioning seals.