Standard Test Method for Determining Thermoplastic Pipe Wall Stiffness

Importancia y uso:

5.1 The performance under bending and compression load of a thermoplastic plastic pipe wall design obtained by this method can be used for the following:

5.1.1 To determine the stiffness of the pipe wall section. This is a function of the pipe dimensions, the wall design, the arc length tested, and the physical properties of the material of which the pipe is made.

5.1.2 To compare the characteristics of various thermoplastic pipe wall designs.

5.1.3 To compare the characteristics of various plastics in pipe form.

5.1.4 To study the interrelations of dimensions, materials, and deformation properties of thermoplastic pipe designs.

5.1.5 To measure the deformation and load-resistance at any of several significant events which may occur during the test.

5.1.6 To provide a reasonable quality control/quality assurance test for very large diameter plastic pipes.

5.2 The time-dependent pipe wall stiffness of a thermoplastic pipe obtained by this test method may used for the following:

5.2.1 To predict the residual stiffness of the pipe wall in bending and compression at all times after initial loading.

5.2.2 For purposes of design, to determine a modulus of relaxation under sustained loads.

5.2.3 To quantify the influence of material formulations of thermoplastics on the modulus of relaxation.

5.2.4 To study the influence of geometric patterns of wall profiles on the modulus of relaxation.

5.3 The time-independent reduction of wall thickness at springline may be used for the following:

5.3.1 For pipe wall stiffness, to quantify the efficiency of all wall profiles of any material composition and a given geometry with that of a solid uniform thickness wall.

Subcomité:

F17.40

Volúmen:

08.04

Número ICS:

23.040.20 (Plastic pipes)

Palabras clave:

buckling; modulus of relaxation; moment of inertia; pipe stiffness; residual pipe stiffness;