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Cited by 37 publications
(24 citation statements)
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“…As low weight has become one of the most urgent targets for both vehicles and airplanes in meeting customer demands and government regulations for energy efficiency, the situation can be improved with the implementation of CFRP composites because of their many advantages in terms of high strength-to-density ratio and good fatigue resistance. The complexity derives from different failure mechanisms, which are influenced by several factors according to previous studies: (1) mechanical properties of the material components, such as fibre, matrix, and fibre-matrix interface 11 ; (2) fibre orientation and fibre volume fraction 12,13 ; and (3) manufacturing defects and material aging due to the extreme working conditions (eg, fibre defects, 14 voids, [1][2][3][4][5][6][7][8][9][10] and mechanical degradation due to hygrothermal aging 15 or ultraviolet radiation 16 ). i, sample after n, cycles; [σ t ], = tensile strength; [σ c ], = compressive strength; a, = normalized stress amplitude; q, = normalized mean stress; c, = ratio between compressive strength and tensile strength; A, f, = constants associated with material; γ(v v ), = intercept of S − N, curve with vertical axis (for composite with void content of v v , ); k(v v ), = slope of S − N, curve (for composite with void content of v v , ); σ max , σ min , = maximum and minimum stress of cyclic load; D, = fatigue damage index; E 0 , = initial modulus; E(N), = residual modulus of the N th , cycle; E(N f ), = modulus at final fracture; δ(u, v v ), φ i (u, v v ), = functions related to the characteristics of damage accumulation (i∈, 1,2) done to investigate the mechanical properties of polymer composites; however, some of the work revealed that the voids have an impact on the mechanical properties, especially fatigue performance.…”
Section: Introductionmentioning
confidence: 99%
“…As low weight has become one of the most urgent targets for both vehicles and airplanes in meeting customer demands and government regulations for energy efficiency, the situation can be improved with the implementation of CFRP composites because of their many advantages in terms of high strength-to-density ratio and good fatigue resistance. The complexity derives from different failure mechanisms, which are influenced by several factors according to previous studies: (1) mechanical properties of the material components, such as fibre, matrix, and fibre-matrix interface 11 ; (2) fibre orientation and fibre volume fraction 12,13 ; and (3) manufacturing defects and material aging due to the extreme working conditions (eg, fibre defects, 14 voids, [1][2][3][4][5][6][7][8][9][10] and mechanical degradation due to hygrothermal aging 15 or ultraviolet radiation 16 ). i, sample after n, cycles; [σ t ], = tensile strength; [σ c ], = compressive strength; a, = normalized stress amplitude; q, = normalized mean stress; c, = ratio between compressive strength and tensile strength; A, f, = constants associated with material; γ(v v ), = intercept of S − N, curve with vertical axis (for composite with void content of v v , ); k(v v ), = slope of S − N, curve (for composite with void content of v v , ); σ max , σ min , = maximum and minimum stress of cyclic load; D, = fatigue damage index; E 0 , = initial modulus; E(N), = residual modulus of the N th , cycle; E(N f ), = modulus at final fracture; δ(u, v v ), φ i (u, v v ), = functions related to the characteristics of damage accumulation (i∈, 1,2) done to investigate the mechanical properties of polymer composites; however, some of the work revealed that the voids have an impact on the mechanical properties, especially fatigue performance.…”
Section: Introductionmentioning
confidence: 99%
“…Very fast or slow flow rates during matrix infusion due to non-optimised process parameters usually lead to small voids which are evenly distributed within the laminate [2][3][4][5][6]. Due to vacuum leakage of the mould relatively large voids occur which are often located between different layers of the laminate [7,8]. Voids within fibre bundles usually have small dimensions, between fibre bundles they are larger and have often spherical shapes [3,4].…”
Section: Introductionmentioning
confidence: 99%
“…A presença de vazios afeta severamente as propriedades das resinas poliméricas e, por consequência, as propriedades dos materiais compósitos produzidos com estas resinas, principalmente as propriedades mecânicas [1][2][3][4] . Em compósitos, os vazios podem se apresentar em vários formatos e tamanhos, sendo diversas as causas para a sua formação, entre elas, o aprisionamento de gás (frequentemente gás úmido) durante o processo de impregnação dos reforços fibrosos com resina, os voláteis gerados durante a formulação da resina e bolhas de ar que podem ser aprisionadas durante a agitação de resinas de elevada viscosidade [5][6][7][8][9] .…”
Section: Introductionunclassified