Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite
Autor: | Hang Li, Xutong Zhang, Hu Junfeng, Guo Wenkang, Xi Deng, Zhou Chen |
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Rok vydání: | 2020 |
Předmět: |
Carbon fiber reinforced polymer
Materials science Polymers and Plastics finite element method Delamination Composite number tensile test 02 engineering and technology General Chemistry Fibre-reinforced plastic 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article Finite element method 0104 chemical sciences lcsh:QD241-441 lcsh:Organic chemistry Ultimate tensile strength open hole strength UACS laminate Composite material 0210 nano-technology Damage tolerance Tensile testing |
Zdroj: | Polymers Volume 12 Issue 7 Polymers, Vol 12, Iss 1622, p 1622 (2020) |
ISSN: | 2073-4360 |
Popis: | Laminates with unidirectionally arrayed chopped strands (UACS) are one of the advanced short fiber reinforced polymer composites (SFRP) with significant application prospect, which greatly improves mechanical properties compared to the traditional SFRP, meanwhile ensuring excellent flowability. In practice, composite laminate with an open hole is one of the typical connective components, and it is necessary to clarify the allowable load and damage tolerance performance of notched structures. In the present study, UACS laminates were fabricated using the continuous carbon fiber reinforced polymer (CFRP) prepreg, on which regularly arrayed bi-angled slits were introduced by a commercial numerical control cutter. The tensile strength and strain distribution around the open hole of the notched UACS laminate were experimentally investigated, while the damage progression near the open hole of the notched UACS laminate was analyzed by the finite element method (FEM). The tensile strength of the notched UACS laminate was measured at 298 MPa, which is about 60% of the strength of the unnotched UACS laminate. The simulation results match well with the experimental results, although there is a little overestimate on strength, by about 5% and 7%, for unnotched and notched UACS laminates, respectively. The final critical failure mode for the notched UACS laminate is mainly dominated by the delamination instead of the fiber breakage in the unnotched UACS laminate. |
Databáze: | OpenAIRE |
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