Dredge Hose Stiffness

[Gumpmaster]

I'm trying to figure out the bending stiffness of a 27 inch ID, 3/4 inch wall dredge hose. I'm bending it through a specified displacement and rotation and need to find out the resulting moments and shears.

Does anyone have any experience with this type of hose? Any approximate modulus of elasticity? I originally cacl'd it as HDPE, but that gives astronomical stresses, so I'm guessing that the actual dredge hose is significantly less stiff. The hose is described as " multi-ply high tensile tire cord reinforced by a dual spring steel wire helix".

 

[dhengr]

I’d talk with dredging contractors or suppliers of that type of hose. They undoubtedly would have the best info. in terms of section properties and material mechanical properties. I would wonder if it isn’t just as likely a hose buckling problem or a situation where it flexes and crimps closed or to a significant restriction. Maybe the compression side of the hose, at the tight bend should be supported by a half round steel plate (in cross section, with dia. of 27"), but then bent to the major radius you need. With this reinforcing structure strapped to the hose. Maybe check with rubber tire manuf’ers., how do they figure stresses and deflections in a heavily loaded truck tire when it is running on smooth roadway or when it hits a chuck hole? What are the important section properties, perameters, characteristics, and material properties. The duel wire helix acts as a reinforcing mesh in compression (maybe tension) continuously supported by the rubber plys and their ability to do this in compression (or tension) and shear and bond with the wire. Think Chinese finger trap, or spring wire wound in two opposite directions. It seems to me that over the years I had seen something on this matter as related to hydraulic hoses, and how the various components provide strength and flexibility, under + or - pressure.