PSI - Issue 77

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 77 (2026) 405–412

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers Voids in fibre-reinforced composites, often viewed as defects, significantly influence the structural integrity of manufacturing processes. This study examines the impact of voids on filament-wound composite pressure vessels, where voids can arise from processing parameter fluctuations or volatile evaporation during curing. While no universal standard defines acceptable void content, a threshold below 3% is often cited for many automotive applications; pushing below this level typically requires advanced, cost-intensive processing. Computed tomography (CT) of vessel samples revealed a non-uniform, layer-dependent void distribution. These measurements informed a finite element model in Abaqus, where void populations were represented statistically and sampled as random fields constrained by the observed spatial distribution. The results clarify how both the amount and distribution of voids affect global burst capacity, offering an insight to structural performance. © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers International Conference on Structural Integrity Influence of Voids on Structural Properties of a Composite Pressure Vessel Kumar C. Jois a , Marcus Welsh a , Takemoto Shinichirou b , Nobuhiro Yoshikawa b a Instiut für Textiltechnik of RWTH Aachen University, Otto-Blumenthal-Str. 1, 52074 Aachen, Germany. b Institute of Industrial Science, The University of Tokyo, 1538505 Japan. Abstract Voids in fibre-reinforced composites, often viewed as defects, significantly influence the structural integrity of manufacturing processes. This study examines the impact of voids on filament-wound composite pressure vessels, where voids can arise from processing parameter fluctuations or volatile evaporation during curing. While no universal standard defines acceptable void content, a threshold below 3% is often cited for many automotive applications; pushing below this level typically requires advanced, cost-intensive processing. Computed tomography (CT) of vessel samples revealed a non-uniform, layer-dependent void distribution. These measurements informed a finite element model in Abaqus, where void populations were represented statistically and sampled as random fields constrained by the observed spatial distribution. The results clarify how both the amount and distribution of voids affect global burst capacity, offering an insight to structural performance. © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers International Conference on Structural Integrity Influence of Voids on Structural Properties of a Composite Pressure Vessel Kumar C. Jois a , Marcus Welsh a , Takemoto Shinichirou b , Nobuhiro Yoshikawa b a Instiut für Textiltechnik of RWTH Aachen University, Otto-Blumenthal-Str. 1, 52074 Aachen, Germany. b Institute of Industrial Science, The University of Tokyo, 1538505 Japan. Abstract 1. Introduction Fiber-reinforced composites (FRCs) offer exceptional strength-to-weight ratios, corrosion resistance, and design flexibility, making them attractive for high-performance structures. Among their diverse applications, composite pressure vessels (CPVs) are widely used for hydrogen storage, space propulsion, breathing apparatus, and natural gas containment, where reduced mass and high reliability are critical. 1. Introduction Fiber-reinforced composites (FRCs) offer exceptional strength-to-weight ratios, corrosion resistance, and design flexibility, making them attractive for high-performance structures. Among their diverse applications, composite pressure vessels (CPVs) are widely used for hydrogen storage, space propulsion, breathing apparatus, and natural gas containment, where reduced mass and high reliability are critical. Keywords: Filament winding; Voids; Composite Pressure Vessel; Hydrogen storage Keywords: Filament winding; Voids; Composite Pressure Vessel; Hydrogen storage

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers 2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSI organizers 10.1016/j.prostr.2026.01.052