Measure the Bending Stiffness of Marine Hoses

Measure the weight of your marine hose sample using the scales.Measure the length of your marine hose sample. Make a note of this value. Divide the weight of your marine hose sample as determined in Step 1 by the length of your hose sample. Make a note of the product, which is the weight per unit length of your hose.Place your length of hose so that part of it hangs over the edge of your table. Measure the distance that it hangs over the edge of the table and multiply this value by the weight per unit length value you determined in

This value is the weight of the part of the hose that is causing the hose to bend due to the effect of gravity. Make a note of this value.Multiply the value determined in Step 3 by the gravitational field strength of the Earth. This gives you the force acting on the hose. Make a note of this value.Measure the outer and inner diameter of the hose using the tape measure. Take the fourth power of the innner diameter of the hose and subtract it from the fourth power of the outer diameter.

Multiply the result of this subtraction by pi. Divide this product by 64. This gives you the area moment of inertia of the hose. Make a note of this value.Measure the increase of the length of the hose that occurs as a result of hanging it over the edge of the table. This can be approximated by measuring the difference between the lengths of the top and bottom surfaces of the part of the hose that hangs. This will probably be a very small value. Divide this value by the length of the bottom surface of the part of the hose that hangs. Make a note of this value. It is the strain of the hose.