How to calculate stress on a pipe wall

[Galvax85]

I have a PVC fitting that keeps cracking. The fitting consists of 2 parts. One piece is placed over the end of a flexible PVC ribbed hose, and the other is inserted inside the hose. The 2 parts act as a compression fitting to attach to the end of the hose. The hose typically has an outside diameter of 1.85". When the internal part is screwed into the hose, it expands the hose's outer diameter to 1.9". The inner diameter of the external part is 1.8". How do I calculate the stress exerted by the compressed hose material on the external part of my fitting?

 

[Chestermiller]

I have a PVC fitting that keeps cracking. The fitting consists of 2 parts. One piece is placed over the end of a flexible PVC ribbed hose, and the other is inserted inside the hose. The 2 parts act as a compression fitting to attach to the end of the hose. The hose typically has an outside diameter of 1.85". When the internal part is screwed into the hose, it expands the hose's outer diameter to 1.9". The inner diameter of the external part is 1.8". How do I calculate the stress exerted by the compressed hose material on the external part of my fitting?

Can you provide a diagram?

 

[Galvax85]

Can you provide a diagram?

https://files.acrobat.com/a/preview/0f3bc05c-05fa-4f75-8304-bcba3d6c7de7

https://files.acrobat.com/a/preview/0f3bc05c-05fa-4f75-8304-bcba3d6c7de7

If the information in my previous post conflicts with what is on the drawing, use the drawing dimensions.

 

[JBA]

Is this failure something that occurs after a period of time in service? If so, have you investigated all of the potential environmental and service elements that might cause loss of strength and/or embrittlement of the outer ring.

 

[Galvax85]

No, they are not in service. No, they are not exposed to foreign elements.

 

[JBA]

Can you find out from the supplier/manufacturer the compressive modulus of the flexible pvc hose material?