20.500.12556/RUL-174953 Modelling of mechanical response of weldlines in injection-moulded short fibre-reinforced polymer components Short fibre-reinforced polymers (SFRPs) are increasingly used in structural applications where mechanical integrity under complex loading is critical. However, conventional modelling approaches often fail to accurately predict mechanical behaviour in weldline regions formed during injection moulding, where microstructural anomalies and pre-existing damage significantly degrade performance. This study addresses these limitations by extending a hybrid micro–macromechanical constitutive framework to incorporate localised initial damage at weldlines. Calibration and validation of the model were conducted using directional tensile tests on dumbbell-shaped polyamide 66 specimens reinforced with 25 wt% glass fibres, featuring controlled weldline geometry. Digital image correlation (DIC) was employed to capture strain fields, while injection moulding simulations provided fibre orientation distributions and weldline positioning. Results demonstrate that incorporating initial damage and its independent evolution for the cold weld region significantly improves prediction accuracy in weldline zones without compromising model efficiency. The proposed approach can be integrated seamlessly with existing finite element framework and offers a robust solution for simulating SFRP components with weldlines, enhancing reliability in safety-critical applications. short-fibre-reinforced polymers weldline modelling material damages fibre orientation injection moulding process simulation constitutive modelling digital image correlation polimeri modeliranje zvarne linije poškodbe materiala usmerjenost vlaken brizganje materialov true false true Angleški jezik Slovenski jezik Članek v reviji 2025-10-10 13:23:08 2025-10-10 13:23:15 2025-12-02 04:07:35 0000-00-00 00:00:00 2025 0 0 20 str. no. 19, art. 2712 Vol. 17 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531:678.7:519.6 2073-4360 10.3390/polym17192712 252711171 Nabergoj,_Urevc_..._Modelling....pdf Nabergoj,_Urevc_..._Modelling....pdf 1 12B1912595AE1011E66F7FDD9330A8D3 0c55875f839a8b38b251bb57baf0fb5cc26c1036c459bd9f6bc14cf1c5eb04d3 7a6708df-a5cb-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=219863 https://www.mdpi.com/2073-4360/17/19/2712 1 46d314c8-a5cb-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=219862 Fakulteta za strojništvo 0 0 0