Experimental and numerical analysis of bolt-loaded open-hole laminates reinforced by winded carbon rovings

Botzkowski, Tim; Galkin, Siegfried; Wagner, Sebastian; Sikora, Sebastian P.; Kärger, Luise

doi:10.1016/j.compstruct.2016.01.057

Cited by 12 publications

(12 citation statements)

References 18 publications

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“…Manufacturing Design Laboratory (MDLab), Purdue University, West Lafayette, USA attachment to surrounding structures 4 limiting the use of the high strength materials. Meanwhile, molded discontinuous fiber composite structures often lack the strength and impact resistance required for structural applications but enable high-rate production of geometrically complex parts which require minimal postprocessing.…”

Section: And Difficulty Withmentioning

confidence: 99%

“…Continuous fiber tow reinforcements in hybrid-molded, thermoplastic composite structures are an emerging technology for providing lightweight, mass producible, structural components for industries such as automotive. 1,2 Traditional continuous fiber reinforced composite structures suffer from limited geometric design flexibility 3 and difficulty with attachment to surrounding structures 4 limiting the use of the high strength materials. Meanwhile, molded discontinuous fiber composite structures often lack the strength and impact resistance required for structural applications but enable high-rate production of geometrically complex parts which require minimal postprocessing.…”

Section: Introductionmentioning

confidence: 99%

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Simulating performance of tow reinforced hybrid-molded composites

Miller

Månsson

2023

Journal of Thermoplastic Composite Materials

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A critical milestone to the adoption of 3D tow reinforced hybrid-molded structures is the development of design guidelines and analysis techniques for accurate performance modelling. The cross-sectional dimensions of the tow bundle leads to fiber length discrepancies between the inner fibers and the outer fibers which manifest as tow spreading and local fiber waviness. The effects of simulating the resulting fiber orientations and effective elastic properties is investigated by modelling a representative beam in tension and bending load cases and comparing to previous experimental results. Accounting for fiber waviness in tension demonstrated greatly improved part stiffness predictions. Spread tow bundles improved predicted strength and stiffness over simulations where tow was constrained to a uniform cross section. Increased tow reinforcement increased bending stiffness, but failure behavior was significantly influenced by the overmolding material.

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Section: And Difficulty Withmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulating performance of tow reinforced hybrid-molded composites

Miller

Månsson

2023

Journal of Thermoplastic Composite Materials

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“…The thickness effect on the translaminar fracture toughness and strength of composites laminates with an open hole was investigated by Chen et al through numerical method, which could capture the failure mode and patterns [15]. In order to investigate the strength of bolt connected CFRP laminates, experimental and numerical analyses were performed to clarify the stiffness and failure behavior of notched laminates [16]. Bao and Liu proposed a model based on the surface cohesive element for the progressive failure analysis of splitting and delamination for composite laminates with an open hole, and the simulation was well consistent with experimental results on strength and failure mode [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Zhang

Chen

et al. 2020

Polymers

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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.

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“…17 Additionally, winded carbon fibre rovings can be used to reinforce bolt-loaded open-holes. 18 The utilization of short-fibre-reinforced thermoplastics in engineering applications has increased strongly in the last years. 19 Recent studies on short-fibre-reinforced thermoplastics investigated how to increase the mechanical performance of such components locally by integrating continuous fibre-reinforced sheets.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the previous investigations where open-hole laminates were reinforced through tapes 4 or winded patches, 18 the present work deals with the reinforcement of open-hole injected thermoplastic plates. Due to the non-directional fibres and the high matrix proportion, the bearing strength of short-fibre thermoplastics is low, which makes local thickenings necessary.…”

Section: Introductionmentioning

confidence: 99%

Analysis of open-hole-tension plates made of short fibre thermoplastic and reinforced with continuous fibre tailored inserts

Arnaut¹,

Dimassi²,

Romahn

et al. 2020

Journal of Thermoplastic Composite Materials

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In the present paper, the influence of tailored load introduction inserts applied to a bolt-loaded open-hole injection plate with different short glass fibre content is investigated. The tailored load introduction inserts made with a Tailored Fibre Placement (TFP) process, as well as open-hole injection plates without an insert were considered as reference samples. The samples were tested under tensile bolt-loading. The influence of the TFP-inserts on the load bearing properties of the open-hole injection plates was investigated. The test results show a huge increase of the load-carrying ability of the short-glass-fibre specimens when TFP-inserts are integrated. Moreover, the damage tolerance was dramatically improved as the specimens with integrated TFP-inserts did not fail abruptly and a residual strength higher than the strength of the test specimen without insert could be observed. However, the strength of the test specimen with integrated insert did not exceed the strength of the insert itself in most cases.

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Experimental and numerical analysis of bolt-loaded open-hole laminates reinforced by winded carbon rovings

Cited by 12 publications

References 18 publications

Simulating performance of tow reinforced hybrid-molded composites

Simulating performance of tow reinforced hybrid-molded composites

Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Analysis of open-hole-tension plates made of short fibre thermoplastic and reinforced with continuous fibre tailored inserts

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