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Experimental Study and Computer Simulation of the Effect of Spider Shape on the Weld-lines in Extruded Plastic Pipe by Y. Huang; P. Prentice is a Materials Science article available to read on EtoBox.

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## Abstract Weld‐lines, also referred to as spider‐lines or knit‐lines, are regions in the wall of an extruded plastic pipe, running the whole length of the pipe, at which there is a change in dimension and a possible reduction in mechanical properties. Weld‐lines result from the flow of the polymer melt around the supports (spiders) that hold the metal core to the outer die assembly in an in‐line annular die. This work examines the fatigue life and the tensile strength of weld‐lines created by a conventionally shaped “torpedo” spider and four modified spider shapes. It is demonstrated that the shape of the spiders has a dramatic effect on the fatigue life of weld‐lines while having a minimal effect on the tensile strength in static loading. The experimental results show that the fatigue life of the weld‐line produced by one of the four new shaped spiders is significantly higher than that of a conventionally shaped spider. Numerical simulations of the flow field around this new and conventional spiders were carried out using the package FIDAP® based on the finite element method (FEM). The simulation results provide a good explanation for the experimental observations and show that

Who reads Experimental Study and Computer Simulation of the Effect of Spider Shape on the Weld-lines in Extruded Plastic Pipe?

Author

Y. Huang; P. Prentice

Publisher

Society for Plastic Engineers; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0032-3888)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)