Design and development of solid carbide step drill K34 for machining of CFRP and GFRP composite laminates

Ship structures made of glass fiber-reinforced polymer (GFRP) composite laminates are considerably thicker than aircraft and automobile structures and more likely to contain voids. The production characteristics of such composite laminates were investigated in this study by ultrasonic nondestructive evaluation (NDE). The laminate samples were produced from E-glass chopped strand mat (CSM) and woven roving (WR) fabrics with different glass fiber contents of 30–70%. Approximately 300 pulse-echo ultrasonic A-scans were performed on each sample. The laminate samples produced from only CSM tended to contain more voids compared with those produced from a combination of CSM and WR, resulting in the relative density of the former being lower than the design value, particularly for high glass fiber contents of ≥50%. The velocity of the ultrasonic waves through the CSM-only laminates was also lower for higher glass fiber contents, whereas it steadily increased for combined CSM–WR laminates. Burn-off tests of the laminates further revealed that the fabric configuration of the combined CSM–WR laminates was of higher quality, prevented the formation of voids, and improved inter-layer bonding. These findings indicate that combined CSM–WR laminates should be used to achieve more accurate ultrasonic NDE of GFRP composite structures.

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Creep effects on tension-tension fatigue behavior of angle-ply GFRP composite laminates

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2019.02.010 ◽

2019 ◽

Vol 123 ◽

pp. 144-156 ◽

Cited By ~ 13

Author(s):

A. Vahid Movahedi-Rad ◽

Thomas Keller ◽

Anastasios P. Vassilopoulos

Keyword(s):

Composite Laminates ◽

Fatigue Behavior ◽

Gfrp Composite

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Prediction of fatigue life for woven GFRP composite laminates with impact damage

National Conference on Challenges in Research & Technology in the Coming Decades (CRT 2013) ◽

10.1049/cp.2013.2552 ◽

2013 ◽

Author(s):

P.S. Shreyas ◽

L. Jullya Naik ◽

H.S. Shetty ◽

N.R. Mathivanan

Keyword(s):

Fatigue Life ◽

Composite Laminates ◽

Impact Damage ◽

Gfrp Composite

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Multiple response optimisation of process parameters during drilling of GFRP composite with a solid carbide twist drill

Materials Today Proceedings ◽

10.1016/j.matpr.2020.02.384 ◽

2020 ◽

Vol 28 ◽

pp. 2039-2046

Author(s):

Ritesh Bhat ◽

Nanjangud Mohan ◽

Sathyashankara Sharma ◽

Dayananda Pai ◽

Sathyabodh Kulkarni

Keyword(s):

Process Parameters ◽

Multiple Response ◽

Twist Drill ◽

Gfrp Composite ◽

Solid Carbide

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Microstructures of the Fiber-Round Hole of the Chafer Cuticle

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.199 ◽

2009 ◽

Vol 79-82 ◽

pp. 199-202

Author(s):

Xin Yan Wu ◽

Fu Ling Guan ◽

Bin Chen ◽

You Wei Wang

Keyword(s):

Mechanical Properties ◽

Stress Concentration ◽

Composite Laminates ◽

3D Models ◽

Fiber Reinforced Composites ◽

Round Hole ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Protein Matrix ◽

Design And Development

In this paper, microstructure and mechanical properties of the chafer cuticle were investigated. The microstructures of the chafer cuticle were first observed with a SEM. It showed that the cuticle is a kind of chitin-fiber-reinforced biocomposite with protein matrix. There are some holes existing in the chafer cuticle and the fibers around hole are continuous. Based on the observed results of the SEM, the analyses of 3D models on the simple composite elements with fiber-round hole were conducted. The result showed the microstructures of composite laminates with fiber-round holes can decrease the stress concentration and well transfer the stress. So it can improve the strength and toughness of the composite laminates included holes. These conclusions may present a bio-inspired approach for design and development of advanced man-made fiber-reinforced composites.

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