What is the stiffness of FRP pipe?
The ring stiffness is the comprehensive parameter of the tube's resistance to external pressure. Obviously, the choice of ring stiffness is one of the keys to ensure the safe operation of plastic underground drainage pipe under the external compressive load. If the ring stiffness of the tube is too small, the tube may undergo excessive deformation or buckling failure. On the other hand, if the ring stiffness is chosen too high, the excessive cross section moment of inertia must be used, which will result in too much material and too high cost.
Ring stiffness refers to a technical index of FRP pipes subjected to external pressure.
Stiffness, also called ring stiffness, is a numerical indicator of actual resistance to external pressure. Ring stiffness S definition: S =EI /D 3 (where E is the elastic modulus of the material, I is the moment of inertia, D is the average diameter of the pipe ring), and the ring stiffness is KN/m2.
