Designer's corner

Zweben, Carl

doi:10.1016/0010-4361(94)90102-3

Cited by 37 publications

(3 citation statements)

References 15 publications

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“…However, according to these theories, the strength of a fibrous structure would be, as claimed in [7], independent of the structure length or size, determined chiefly by l which is generally not related to l . However, this conclusion is in conflict with some of the experimental findings, for example [20,28]. Zweben [28] has listed many results as evidence for a size effect.…”

Section: Introductionmentioning

confidence: 86%

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Investigation on the strength–size relationship in fibrous structures including composites

Pan

Chen

Thompson

et al. 1998

Journal of Materials Science

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The size effects due to changes in gauge length and the influence of the fragmentation phenomenon in fibrous structures are examined. First, a theoretical analysis of the differences of the size effects in single fibre and in a fibrous structure is conducted. Then comprehensive experimental work is presented on single fibres, fibre bundles, and twisted yarns which can be considered as pseudo-composites. Next a comparison is made between the theoretical predictions and the experimental data. Causes for the size effect in a fibrous structure are explored.

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Section: Introductionmentioning

confidence: 86%

“…However, this conclusion is in conflict with some of the experimental findings, for example [20,28]. Zweben [28] has listed many results as evidence for a size effect. Also he has explored the reasons why the size effect in composites has not been widely recognized and the implications of the size effect for composite applications.…”

Section: Introductionmentioning

confidence: 86%

Investigation on the strength–size relationship in fibrous structures including composites

Pan

Chen

Thompson

et al. 1998

Journal of Materials Science

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“…According to Weibull's weakest link theory, 22 the strength of a brittle material is size dependent, since there is a higher probability that a larger volume of material contains a critical flaw. Many studies [23][24][25][26][27] have shown that the tensile strength of single brittle filaments decreases with increasing length. This reported size effect is well documented for carbon fibres since they are almost completely brittle and show 100% elastic recovery below the fracture strength.…”

Section: Single Fibre Bundle Testingmentioning

confidence: 99%

Net shape spray deposition for compression moulding of discontinuous fibre composites for high performance applications

Luchoo

Harper

Bond

et al. 2010

Plastics, Rubber and Composites

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Details are presented of a novel carbon/epoxy spray deposition process for producing high performance, net shape charges for low flow compression moulding. The Bentley-Raycell automated carbon composite charge deposition (BRAC3D) process sprays powdered epoxy and chopped carbon bundles onto three-dimensional (3D) tools, offering a fully automated process with no touch labour. It has been demonstrated that fibre volume fractions of up to 54% are achievable for random discontinuous fibre architectures, with low void content (1?6%). This extends the volume fraction range currently offered by liquid moulding/preforming processes and potentially reduces part scrap rate, since the resin flow direction is through thickness rather than in-plane. Results from an experimental programme are presented, which aims to benchmark the BRAC3D material against commercial advanced moulding compounds. Ultimate tensile strength, tensile modulus and Charpy impact values are reported to be 272 MPa, 44?4 GPa and 128 kJ m 22 respectively, for the random fibre architecture at a fibre volume fraction of 54%. This equates to a 99% stiffness retention and a 59% strength retention compared to a continuous fibre, quasi-isotropic counterpart. Observed trends for increasing fibre volume fraction and fibre length have been compared against finite element predictions and an analytical inclusion model. Simulations from a parametric cost model indicate that the BRAC3D process is cost effective for production volumes exceeding 1100 ppa for a structural demonstrator component, compared with prepreg and resin transfer moulding.

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Composite Materials

Zweben¹

2015

Mechanical Engineers' Handbook

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Composites are important materials which are now used widely, not only in the aerospace industry, but also in a large and increasing number of commercial mechanical engineering applications, such as internal combustion engines; machine components; thermal management and electronic packaging; automobile, train, and aircraft structures and mechanical components, such as brakes, drive shafts, flywheels, tanks, and pressure vessels; dimensionally stable components; process industries equipment requiring resistance to high‐temperature corrosion, oxidation, and wear; offshore and onshore oil exploration and production; marine structures; sports and leisure equipment; ships and boats; and biomedical devices. The four primary categories of composites are polymer matrix composites (PMCs), metal matrix composites (MMCs), ceramic matrix composites (CMCs), and carbon matrix composites (CAMCs). Carbon‐carbon composites (CCCs) are the most important subclass of CAMCs. Composites also offer a number of significant manufacturing advantages over monolithic metals and ceramics. Composites are complex and heterogeneous material systems.

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Designer's corner

Cited by 37 publications

References 15 publications

Investigation on the strength–size relationship in fibrous structures including composites

Investigation on the strength–size relationship in fibrous structures including composites

Net shape spray deposition for compression moulding of discontinuous fibre composites for high performance applications

Composite Materials

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