scholarly journals Research on drilling CFRP laminate with a thin woven glass fiber surface layer using plane rake–faced twist drill

2021 ◽  
Author(s):  
Liping Liu ◽  
Bo Lian ◽  
Changgeng Zhou ◽  
Kehao Duan ◽  
Xueming Zhu ◽  
...  
Keyword(s):  
Surface Layer ◽  
Glass Fiber ◽  
Fiber Surface ◽  
Twist Drill ◽  
Cfrp Laminate ◽  
Woven Glass Fiber

scholarly journals Research On Drilling CFRP Laminate With A Thin Woven Glass Fiber Surface Layer Using Plane Rake Faced Twist Drill

2021 ◽  
Author(s):  
Liping Liu ◽  
Bo Lian ◽  
Changgeng Zhou ◽  
Kehao Duan ◽  
Xueming Zhu ◽  
...  
Keyword(s):  
Surface Layer ◽  
Glass Fiber ◽  
Geometric Structure ◽  
Thrust Force ◽  
Fiber Surface ◽  
Rake Angle ◽  
Drilling Process ◽  
Twist Drill ◽  
Cfrp Laminate ◽  
Woven Glass Fiber

Abstract The delamination produced during drilling CFRP will affect its structural strength seriously. Delamination is closely related to the thrust force during drilling, which is closely related to the tool, so it is particularly important to choose the tools with appropriate geometric structure. Many scholars used tools with different geometric structure to drill CFRP, and then conducted the drilling damage analyses and drilling mechanism researches. It finally came to a conclusion that drill with special structure had certain advantage compared with common twist drill in the drilling process. In this paper, a new type of plane rake faced twist drill was used to drill the CFRP laminate with a thin woven glass fiber surface layer. Experimental results showed that plane rake faced twist drill along cutting edge had a constant reference rake angle value, which caused the plane rake faced twist drill generated smaller thrust force and less drilling damage than the common twist drill. As the reference rake angle of plane rake faced twist drill increased, the thrust force and drilling damage decreased. It was revealed the inhibition of the thin woven glass fiber surface layer on the drilling damage at entrance and exit. Finally, it was proposed that when plane rake faced twist drill was used to drill CFRP laminate with a thin woven glass fiber surface, 46° reference rake angle should be selected.

scholarly journals Effect of the Reinforcement Phase on Indentation Resistance and Damage Characterization of Glass/Epoxy Laminates Using Acoustic Emission Monitoring

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
C. Suresh Kumar ◽  
K. Saravanakumar ◽  
P. Prathap ◽  
M. Prince ◽  
G. Bharathiraja ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Glass Fiber ◽  
Research Work ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Cumulative Energy ◽  
Static Indentation ◽  
Felicity Ratio ◽  
Woven Glass Fiber ◽  
Energy Absorbing

The effect of reinforcement phases on indentation resistance and damage behavior of glass/epoxy laminates was investigated in this research work. Woven glass fiber mat and nonwoven chopped glass fiber mat were used as fiber reinforcement phases for fabricating the laminates. Low-velocity impact and quasi-static indentation tests were performed on both laminates to investigate the contact behavior and energy-absorbing capability. Moreover, the acoustic emission (AE) technique was employed to monitor the indentation damage resistance. AE parameters including normalized cumulative counts (NCC), normalized cumulative energy (NCE), rise angle (RA), and felicity ratio (FR) were analyzed. The bidirectional laminates showed premature load drops and drastic changes in the normalized cumulative counts/energy profile in the beginning of loading cycles, indicating the development of macrodamage such as debonding/delamination. AE sentry function results of bidirectional laminates show longer PII function at the earlier stages, associated with minor PIII function and greater PIV function, indicating the continuous degradation and progression of damage. In contrast, the chopped laminates exhibited superior postimpact performance than the bidirectional laminates. The presence of randomly oriented fibres prevents the delamination crack propagation during compression loading, which was attributed with the increased residual compressive strength.

Modification of glass fiber surface by nylon-6,6 grafting

2005 ◽  
Vol 12 (5) ◽  
pp. 425-443 ◽  
Author(s):  
Maite Bera Aberem ◽  
Wei Feng ◽  
Abdellatif Ait-Kadi ◽  
Bernard Riedl ◽  
Josee Brisson
Keyword(s):  
Glass Fiber ◽  
Fiber Surface ◽  
Nylon 6,6

Investigation of the Wetting Process of Glass Fiber with Oligophenylene Sulfide Sulfone

2021 ◽  
Vol 899 ◽  
pp. 326-331
Author(s):  
Zhanna I. Kurdanova ◽  
Kamila T. Shakhmurzova ◽  
V.A. Guchinov ◽  
Ilya Kobyhno ◽  
Andrey Bezborodov
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Glass Fiber ◽  
Carbon Fibers ◽  
Fiber Surface ◽  
Reinforcing Fillers ◽  
Study Results ◽  
Wetting Time ◽  
Wetting Process ◽  
Over Time

The wettability of reinforcing fillers such as glass and carbon fibers is a significant factor influencing the mechanical properties of the composite. This study focuses on the effect of finishing glass fiber surfaces with different concentrations of oligophenylene sulfide sulfone solution on fiber wettability, which is determined by contact angle and wetting time. The Adam-Schütte method was chosen as a method for determining the contact angle. According to the study results a 1.5% solution of oligophenylene sulfide sulfone in N, N'-dimethylacetamide gives a contact angle of 45°, forming over time a thin film on the fiber surface, which indicates a sufficiently high sizing ability.

Macro/Meso/Micro Elastic-Viscoplastic Analysis of Plain-Woven Laminates Using Homogenization Theory

2014 ◽  
Vol 626 ◽  
pp. 365-371 ◽  
Author(s):  
Kohei Oide ◽  
Tetsuya Matsuda
Keyword(s):  
Experimental Data ◽  
Constitutive Equation ◽  
Glass Fiber ◽  
Present Method ◽  
Time Dependent ◽  
Homogenization Theory ◽  
Fiber Bundles ◽  
Woven Glass Fiber ◽  
Good Agreement

In this study, macro/meso/micro elastic-viscoplastic analysis of plain-woven laminates is conducted based on a homogenization theory for nonlinear time-dependent composites. For this, a plain-woven laminate is modeled with respect to three scales by considering the laminate as a macrostructure, fiber bundles (yarns) and a matrix in the laminate as a mesostructure, and fibers and a matrix in the yarns as a microstructure. Then, an elastic-viscoplastic constitutive equation of the laminate is derived by dually applying the homogenization theory for nonlinear time-dependent composites to not only the meso/micro but also the macro/meso scales. Using the present method, the elastic-viscoplastic analysis of a plain-woven glass fiber/epoxy laminate subjected to on-and off-axis loading is performed. It is shown that the present method successfully takes into account the effects of viscoplasticity of the epoxy in yarns on the elastic-viscoplastic behavior of the plain-woven GFRP laminate. It is also shown that the results of analysis are in good agreement with experimental data.

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