Electrical resistance changes of 3D carbon fiber/epoxy woven composites under short beam shear loading along different orientations

2021 ◽  
pp. 114549
Author(s):  
Chaofeng Han ◽  
Shuwei Huang ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Carbon Fiber ◽  
Electrical Resistance ◽  
Shear Loading ◽  
Woven Composites ◽  
Short Beam ◽  
Beam Shear ◽  
Carbon Fiber Epoxy

Microstructure optimizations for improving interlaminar shear strength and self-healing efficiency of spread carbon fiber/epoxy laminates containing microcapsules

2020 ◽  
Vol 55 (1) ◽  
pp. 27-38
Author(s):  
Yasuka Nassho ◽  
Kazuaki Sanada
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Optical Microscope ◽  
Interlaminar Shear Strength ◽  
Self Healing ◽  
Short Beam ◽  
Healing Efficiency ◽  
Beam Shear ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy

The purpose of this study is to improve interlaminar shear strength and self-healing efficiency of spread carbon fiber (SCF)/epoxy (EP) laminates containing microcapsules. Microencapsulated healing agents were embedded within the laminates to impart a self-healing functionality. Self-healing was demonstrated on short beam shear specimens, and the healing efficiency was evaluated by strain energies of virgin and healed specimens. The effects of microcapsule concentration and diameter on apparent interlaminar shear strength and healing efficiency were discussed. Moreover, damaged areas after short beam shear tests were examined by an optical microscope to investigate the relation between the microstructure and the healing efficiency of the laminates. The results showed that the stiffness and the apparent interlaminar shear strength of the laminates increased as the microcapsule concentration and diameter decreased. However, the healing efficiency decreased with decreasing the microcapsule concentration and diameter.

Experimental study of the anisotropic thermal conductivity of 2D carbon-fiber/epoxy woven composites

2021 ◽  
Vol 267 ◽  
pp. 113870
Author(s):  
Hu Zhang ◽  
Kefan Wu ◽  
Guangming Xiao ◽  
Yanxia Du ◽  
Guihua Tang
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Carbon Fiber ◽  
Woven Composites ◽  
Anisotropic Thermal Conductivity ◽  
Carbon Fiber Epoxy

Rail Shear and Short Beam Shear Properties of Various 3-Dimensional (3-D) Woven Composites

2016 ◽  
Author(s):  
Mark Pankow ◽  
Ashiq Quabili ◽  
Stephen Whittie ◽  
Chian Yen
Keyword(s):  
Woven Composites ◽  
Shear Properties ◽  
3 Dimensional ◽  
Short Beam ◽  
Beam Shear

scholarly journals Short Beam Shear Behavior and Failure Characterization of Hybrid 3D Braided Composites Structure with X-ray Micro-Computed Tomography

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1931
Author(s):  
Liwei Wu ◽  
Xiaojun Sun ◽  
Chunjie Xiang ◽  
Wei Wang ◽  
Fa Zhang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Transverse Shear ◽  
Failure Modes ◽  
Hybrid Composites ◽  
Shear Loading ◽  
Micro Computed Tomography ◽  
Braided Composites ◽  
Braided Composite ◽  
Shear Property ◽  
Beam Shear

Three-dimensional braided composite has a unique spatial network structure that exhibits the characteristics of high delamination resistance, damage tolerance, and shear strength. Considering the characteristics of braided structures, two types of high-performance materials, namely, aramid and carbon fibers, were used as reinforcements to prepare braided composites with different hybrid structures. In this study, the longitudinal and transverse shear properties of 3D braided hybrid composites were tested to investigate the influences of hybrid and structural effects. The damage characteristics of 3D braided hybrid composites under short beam shear loading underwent comprehensive morphological analysis via optical microscopy, water-logging ultrasonic scanning, and X-ray micro-computed tomography methods. It is shown that the shear toughness of hybrid braided composite has been improved at certain degrees compared with the pure carbon fiber composite under both transverse and longitudinal directions. The hybrid braided composites with aramid fiber as axial yarn and carbon fiber as braiding yarn exhibited the best shear toughness under transverse shear loading. Meanwhile, the composites with carbon fiber as axial yarn and aramid fiber as braiding yarn demonstrated the best shear toughness in the longitudinal direction. Due to the different distribution of axial and braiding yarns, the transverse shear property of hybrid braided structure excels over the longitudinal shear property. The failure modes of the hybrid braided composite under the two loading directions are considerably different. Under transverse loading, the primary failure mode of the composites is yarn fracture. Under longitudinal loading, the primary failure modes are resin fracture and fiber slip. The extensive interfacial effects and the good deformation capability of the hybrid braided composites can effectively prevent the longitudinal development of internal cracks in the pattern, improving the shear properties of braided composites.

A Novel Method for Dynamic Short-Beam Shear Testing of 3D Woven Composites

2012 ◽  
Vol 53 (3) ◽  
pp. 493-503 ◽  
Author(s):  
T. R. Walter ◽  
G. Subhash ◽  
B. V. Sankar ◽  
M. C. Song ◽  
C. F. Yen
Keyword(s):  
Woven Composites ◽  
Shear Testing ◽  
Short Beam ◽  
Beam Shear ◽  
3D Woven Composites ◽  
Novel Method

scholarly journals Improved impact response of hygrothermally conditioned carbon/epoxy woven composites

2016 ◽  
Vol 23 (6) ◽  
pp. 699-710 ◽  
Author(s):  
Yucheng Zhong ◽  
Sunil Chandrakant Joshi
Keyword(s):  
Carbon Fiber ◽  
Impact Resistance ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Elastic Response ◽  
Woven Composites ◽  
Low Velocity ◽  
Hygrothermal Conditioning ◽  
The Impact ◽  
Carbon Fiber Epoxy

AbstractThe effects of hygrothermal conditioning and moisture on the impact resistance of carbon fiber/epoxy composite laminates were investigated. Specimens were fabricated from carbon fiber/epoxy woven prepreg materials. The fabricated specimens were either immersed in water at 80°C or subjected to hot/wet (at 80°C in water for 12 h) to cold/dry (at -30°C in a freezer for 12 h) cyclic hygrothermal conditions, which resulted in different moisture contents inside the laminates. It was found that the absorbed moisture did not migrate out from composite materials at -30°C. Neither of the hygrothermal conditions in this study had detrimental effects on the microstructure of the laminates. Low-velocity impact testing was subsequently conducted on the conditioned specimens. When attacked by the same level of impact energy, laminates with different moisture levels experienced different levels of impact damage. Moisture significantly alleviated the extent of damage in carbon fiber/epoxy woven laminates. The elastic response of the laminate under impact was improved after hygrothermal conditioning. The mechanism behind the improved impact resistance after absorbing moisture was proposed and deliberated.

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