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<p>In a first step, the objective of this research is to investigate a modified layer removal method (LRM) in order to isolate several concentric cylinders (or layers) from an HDPE-80 pipe. It involves combining milling and boring operations to prepare 5 similar specimens at different radial positions. In a second step,&#xa0;a modified LRM is used to study the distribution of residual stresses across the pipe thickness. After slitting, residual displacements (δr) are measured in the extreme layers (1: inner and 5: outer) and in the intermediate layers (2, 3, and 4). The calculation procedure is based on available models which are adapted to this configuration. It is found that δr &gt; 0 for the innermost layer while it remains negative (δr &lt; 0) for the rest of the layers. For all employed methods, LRM (turning or boring, exponential and approximation), absolute values of tensile stresses at outermost side (layer 5) are higher than compressive ones (taking place in other layers). Based on 168-h relaxation period, residual stresses from turning ranged through the pipe wall from − 0.22 to + 1.30&#xa0;MPa, while for boring, they varied from − 0.20 to + 1.02&#xa0;MPa. For the intermediate layers, all methods show closer compressive results. At the inner side, fluctuating results are noted, and it is the exponential method that overestimates the level of stress in contrast to <i>Broutman’s approximation</i> (3.00&#xa0;MPa against 2.5&#xa0;MPa). Compared to literature data, residual stresses in the innermost layer are positive and in the same range for all methods (between + 1.39 and + 2.35&#xa0;MPa), whereas they are relatively low at the innermost pipe layer ranging from − 1.90 to − 0.22&#xa0;MPa.</p>

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A modified progressive layer removal method based on turning and boring: residual stress analysis in HDPE-80 pipe

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Soumia Bouchakhchoukha,
  • Latifa Alimi,
  • Kamel Chaoui

摘要

In a first step, the objective of this research is to investigate a modified layer removal method (LRM) in order to isolate several concentric cylinders (or layers) from an HDPE-80 pipe. It involves combining milling and boring operations to prepare 5 similar specimens at different radial positions. In a second step, a modified LRM is used to study the distribution of residual stresses across the pipe thickness. After slitting, residual displacements (δr) are measured in the extreme layers (1: inner and 5: outer) and in the intermediate layers (2, 3, and 4). The calculation procedure is based on available models which are adapted to this configuration. It is found that δr > 0 for the innermost layer while it remains negative (δr < 0) for the rest of the layers. For all employed methods, LRM (turning or boring, exponential and approximation), absolute values of tensile stresses at outermost side (layer 5) are higher than compressive ones (taking place in other layers). Based on 168-h relaxation period, residual stresses from turning ranged through the pipe wall from − 0.22 to + 1.30 MPa, while for boring, they varied from − 0.20 to + 1.02 MPa. For the intermediate layers, all methods show closer compressive results. At the inner side, fluctuating results are noted, and it is the exponential method that overestimates the level of stress in contrast to Broutman’s approximation (3.00 MPa against 2.5 MPa). Compared to literature data, residual stresses in the innermost layer are positive and in the same range for all methods (between + 1.39 and + 2.35 MPa), whereas they are relatively low at the innermost pipe layer ranging from − 1.90 to − 0.22 MPa.