How to measure the ring stiffness. It can be tested using
Ring stiffness testing machine. And can test the tensile strength, bending strength, bending modulus, shear strength, ring stiffness and other tests.
Plastic pipe is a high-tech composite building chemical building materials, and chemical building materials are the fourth largest category of new building materials emerging after steel, wood and cement. In recent years, chemical building materials have made rapid progress in our country. In particular, the widespread use of new environmentally-friendly plastic pipe has created a revolution in replacing traditional building materials.
The numerical value of the stiffness of the plastic pipe ring represents the resistance of the plastic buried pipe against external pressure. If the ring stiffness of the pipe is too small, the pipe may undergo excessive deformation or collapse. On the other hand, if the ring stiffness is chosen too high, excessive moments of inertia in the area must be used, which will cause too much material and cost.
Testing range: testing of ring pipe flexibility, ring stiffness, flatness, weld elongation, pipe creep ratio, etc., determination of ring stiffness of ring-shaped cross-section thermoplastic plastic pipe and glass-fiber reinforced plastic pipe, meeting PE double-wall corrugated pipe, winding pipe And various pipe standards requirements.
GB/T 9647-2003 Determination of Ring Stiffness of Thermoplastic Pipes
GB/T18477-2001 Unplasticized polyvinyl chloride (PVC-U) double-wall corrugated pipe for underground drainage
GB/T19472.1-2004 Bulk polyethylene (PE) structural wall piping system Part 1: Polyethylene double-wall corrugated pipe materials
GB/T16800-1997 Core foamed polyvinyl chloride (PVC-U) pipe for drainage
GB/T18477-2001 Unplasticized polyvinyl chloride (PVC-U) double-wall corrugated pipe for underground drainage
GB/T21237-2008 glass fiber reinforced plastic sand tube
GB/T 165-2002 high density polyethylene winding wall structure pipe
GB/T 838-1998 glass fiber winding reinforced thermosetting resin sandwich sand pressure pipe
The following formula can be used to calculate the ring stiffness calculation formula for each sample a, b, and c
Si=(0.0186+0.025Yi/di)Fi/LiYi
Ring stiffness calculation formula:
Fi—The force value relative to the deformation of 3.0% of pipe, in kN
Li-sample length in meters (m)
Yi─The amount of deformation, in meters (m), corresponding to the deformation of 3.0% of the deformation, such as:
Y/di=0.03,
Calculate the ring stiffness of the pipe in kN per square meter (KN/m2). When averaging the three values, use the following formula:
S=(Sa+Sb+Sc)/3
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