The effect of weave pattern and crack propagation direction on mode I delamination resistance of woven glass and carbon composites

Alif, Nidal; Carlsson, Leif A.; Boogh, L.

doi:10.1016/s1359-8368(98)00014-6

Cited by 132 publications

(83 citation statements)

References 6 publications

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“…In [17,18]. Though the strength properties of composites in the present study followed the same performance order as that of elongation to break, for fabric (table 1), such relations are not so simple.…”

Section: Resultsmentioning

confidence: 61%

Influence of weave of carbon fabric on abrasive wear performance of polyetherimide composites

Rattan

Bijwe

2006

Tribol Lett

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Three composites of Polyetherimide (PEI) reinforced with carbon fabric (CF) of three weaves viz. plain, twill and satin-4 H were developed keeping the amount of fabric constant (55% by vol.). Studies on mechanical properties confirmed that the twill weave composite (T) showed the highest strength, modulus (both tensile and flexural) and interlaminar shear strength (ILSS) followed by satin (S) and plain weave (P) composites. The performance order, however, was reverse in the case of toughness and elongation to break. Specific wear rate in a single-pass, unidirectional and un-lubricated abrasive wear mode against SiC paper showed strong influence of weave in mild wear condition (load 10 N). Composite S showed the highest wear resistance (W R ) followed by composites T and P. With increase in load, the difference in performance diminished to the extent that at 40 N, it was almost similar for all the three composites. This was correlated with the difference in the length of the fibers between crossover points which, in turn, allowed the microdisplacement of fibers in the composites during abrasion. This was supported by the SEM.KEY WORDS: bi-directionally (BD) reinforced polymer composites, abrasive wear behavior of BD composites, polyetherimidecarbon fabric composites, weaves of fabric in tribology

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Section: Resultsmentioning

confidence: 61%

Influence of weave of carbon fabric on abrasive wear performance of polyetherimide composites

Rattan

Bijwe

2006

Tribol Lett

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“…Generally, these are found to be more delamination resistant than their UD reinforced counterparts. The nonplanar structure of woven fabric reinforced composites causes a delamination crack to interact with matrix regions and the weave structure during its propagation, thereby increasing the growth resistance [32,33]. Figure 4.16 (right) shows a cross-section of the hybrid peel specimen.…”

Section: End-loaded-split Beam Experimentsmentioning

confidence: 99%

Weld strength of laser-assisted tape-placed thermoplastic composites

Grouve¹

108

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Cover: photograph of a leaf taken in Van Heek Park, Enschede. The veins in the leaf do not only serve to transport water and nutrients, but also support the leaf to give it its structure. WELD STRENGTH OF LASER-ASSISTED TAPE-PLACED THERMOPLASTIC COMPOSITES PROEFSCHRIFT SummaryLaser-assisted tape placement is an attractive manufacturing technology for the aerospace industry as it combines high productivity with low energy consumption. It comprises the automated deposition of fiber reinforced thermoplastic tapes to incrementally build up a structure. The process can also be used to tailor the properties of conventionally manufactured woven fabric reinforced components by locally reinforcing these with unidirectionally reinforced tapes. This thesis focuses on the weld strength between the tape and the woven fabric reinforced component. The principal objective is to develop an in situ processing strategy, combining high productivity and energy efficiency with high weld strength. For this purpose, the important bonding mechanisms, processing parameters and material properties are identified through a combination of experimental work and physical modeling.The interlaminar bonding process comprises the development of intimate contact followed by the interdiffusion of polymer chains. Both mechanisms depend strongly on the interface temperature. A thermal process model is, therefore, proposed specifically taking into account the optical aspects of laser heating. The model is validated experimentally. Based on the developed model, the important processing paramaters and material properties are identified.A mandrel peel test is introduced to quantify the interfacial fracture toughness between the tape and the laminate. The applicability and validity of the method is successfully demonstrated by comparing it to standardized fracture mechanics tests. The interfacial fracture toughness does not only depend on the degree of interlaminar bonding. The crystallinity and structural morphology of the interface also play an important role. This is demonstrated by a comparison between the (fast) tape placement process and a (slow) press-molding process. The tape-placed specimens outperform the press-molded specimens in terms of fracture toughness by almost a factor of two. This is attributed to the high cooling rates and short bonding time during the tape placement process. The former results in a low crystallinity, while the latter prevents the migration of tape fibers into the resin pockets of the laminate and thereby minimizes the fiber-fiber contact. Both the low crystallinity and the presence of resin pockets improve the interfacial fracture toughness.Finally, a processing strategy is proposed, which maximizes productivity and energy efficiency. The strategy involves the distribution of all laser power to the tape. Although the proposed strategy should be tested in practice, the work in this thesis suggests that an excellent weld strength will be achieved. i SamenvattingHet laser-verwarmd tape-placementproces is een aantrekkelij...

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“…In plain weave in the context of CFRP, there are three types of laid-up configurations available, out-of-phase/folded configuration, iso-phase/stacked configuration, and random phase configuration [46][47][48]. Also, the placement of the end of the crack-starter Polytetrafluoroethylene (PTFE) film may vary with respect to the position of the transverse or fill yarn and this can affect the crack propagation results [49].…”

Section: Lamina Stacking and Laid-up Configurationsmentioning

confidence: 99%

Multiscale Polymer Composites: A Review of the Interlaminar Fracture Toughness Improvement

Dikshit

Bhudolia

Joshi

2017

Fibers

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Abstract:Composite materials are prone to delamination as they are weaker in the thickness direction. Carbon nanotubes (CNTs) are introduced as a multiscale reinforcement into the fiber reinforced polymer composites to suppress the delamination phenomenon. This review paper presents the detailed progress made by the scientific and research community to-date in improving the Mode I and Mode II interlaminar fracture toughness (ILFT) by various methodologies including the effect of multiscale reinforcement. Methods of measuring the Mode I and Mode II fracture toughness of the composites along with the solutions to improve them are presented. The use of different methodologies and approaches along with their performance in enhancing the fracture toughness of the composites is summarized. The current state of polymer-fiber-nanotube composites and their future perspective are also deliberated.

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The effect of weave pattern and crack propagation direction on mode I delamination resistance of woven glass and carbon composites

Cited by 132 publications

References 6 publications

Influence of weave of carbon fabric on abrasive wear performance of polyetherimide composites

Influence of weave of carbon fabric on abrasive wear performance of polyetherimide composites

Weld strength of laser-assisted tape-placed thermoplastic composites

Multiscale Polymer Composites: A Review of the Interlaminar Fracture Toughness Improvement

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