Analysis of mechanical properties of RTP pipe based on progressive failure model

doi:10.19491/j.issn.1001-9278.2025.07.008

Abstract

Abstract:

This study investigated the mechanical behavior of reinforced thermoplastic composite pipes （RTP） under internal pressure using finite element analysis. A Python⁃based parametric modeling script was developed to establish the reinforcement layer model in ABAQUS， incorporating the Hashin progressive failure criterion to predict damage initiation and progression. The simulation analyzed the effects of reinforcement layer configuration and fiber winding angles on pipeline performance. Results demonstrated that a four⁃layer reinforcement design withstood 10 MPa internal pressure with a safety margin， exhibiting only 1468 MPa stress in the innermost fibers （Hashin criterion <1）. Furthermore， fiber orientation significantly influences mechanical performance： at ±75 ° winding angles， maximum stress reduces by approximately 48 % compared to ±35 ° configurations （816.3 MPa vs. 1 569 MPa）， with the Hashin criterion decreasing to 0.278. These findings provide valuable insights for optimizing RTP design parameters to enhance structural integrity under operational pressures.

Key words: reinforced thermoplastic pipe, progressive failure, Hashin failure criterion, mechanical property, composite

CLC Number:

TQ327

WANG Wenhao, QIU Siyuan, LI Yajiao, SUN Jingyao, WU Daming, WANG Shuyuan, XU Hong, GAI Yunqing. Analysis of mechanical properties of RTP pipe based on progressive failure model[J]. China Plastics, 2025, 39(7): 44-48.

Figures/Tables 14

E₁/GPa	E₂/GPa	V₁₂	G₁₂/GPa	G₁₃/GPa	G₂₃/GPa
135	8.8	0.33	5.5	5.5	3.3

Tab.1. T300 carbon fiber reinforced layer material properties 1

X_t /MPa	X_c /MPa	Y_t /MPa	Y_c /MPa	S_xz /MPa	S_yz /MPa
1 548	1 226	55.5	232	89.9	89.9

Tab.2. T300 carbon fiber reinforced layer material properties 2

Fig.1. Program flow chart

Fig.2. Schematic diagram of the enhancement layer model

管内径/

管外经/

内衬层

厚度/mm

增强层

厚度/mm

缠绕角度/

管长度/

内压/

MPa

±55

300

Tab.3. Enhanced layer model parameters

Fig.3. Maximum fiber stress in layer reinforcement and Hashin failure criterion

Fig.4. Maximum stress in fibers of 4 reinforcing layers and Hashin failure criterion

Fig.5. Maximum stresses in fibers of 8 reinforcing layers and Hashin failure criterion

Fig.6. 4⁃layer enhancement layer model cloud diagram

Fig.7. 2⁃layer enhanced layer model cloud

Fig.8. Progressive failure diagram for the inner layer of a 2⁃layer reinforcement layer

Fig.9. Schematic distribution of different winding angles

Fig.10. Maximum fiber stress at different winding angles

Fig.11. Fiber stress and Hashin failure criterion for 35 °，55 °，75 ° winding angle

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