How to calculate stress on a pipe wall

AI Thread Summary
To calculate the stress on the pipe wall of the PVC fitting, the dimensions of the hose and fitting must be accurately considered, specifically the outer diameter of the hose when compressed and the inner diameter of the fitting. The discussion highlights the need to investigate the compressive modulus of the flexible PVC hose material, which is essential for accurate stress calculations. The user notes that the fittings are not yet in service and are not exposed to environmental factors that could contribute to their cracking. Concerns about potential failure mechanisms over time are raised, emphasizing the importance of understanding material properties. Accurate calculations and material assessments are crucial to prevent future issues with the fittings.
Galvax85
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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?
 
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Galvax85 said:
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?
 
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.
 
No, they are not in service. No, they are not exposed to foreign elements.
 
Can you find out from the supplier/manufacturer the compressive modulus of the flexible pvc hose material?
 

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