Modeling the Dynamic Response of a Carbon-Fiber-Reinforced Plate at Resonant Vibrations Considering the Internal Friction in the Material and the External Aerodynamic Damping

2017 ◽  
Vol 53 (4) ◽  
pp. 425-440 ◽  
Author(s):  
V. N. Paimushin ◽  
V. A. Firsov ◽  
V. M. Shishkin
Keyword(s):  
Carbon Fiber ◽  
Internal Friction ◽  
Dynamic Response ◽  
Fiber Reinforced ◽  
Resonant Vibrations ◽  
Aerodynamic Damping ◽  
Reinforced Plate ◽  
Carbon Fiber Reinforced

scholarly journals Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Pascal Simon ◽  
Philipp Drechsel ◽  
Peter Katrik ◽  
Kay-Obbe Voss ◽  
Philipp Bolz ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Dynamic Response ◽  
High Power ◽  
Energy Deposition ◽  
Surface Velocity ◽  
Monte Carlo Code ◽  
Low Density ◽  
Fiber Reinforced ◽  
Proton Beams ◽  
Carbon Fiber Reinforced

Various graphite targets with a tantalum core were exposed to 440 GeV pulsed proton beams at the HiRadMat facility at CERN. The dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. The study comprises different graphite grades, such as polycrystalline, expanded and carbon-fiber reinforced graphite, and low-density graphitic foams, all candidates for beam-intercepting devices in high-power accelerators. The purpose of the tantalum core is to concentrate the large energy deposition in this high-density material that withstands the localized beam-induced temperature spike. The generated pressure waves are estimated to result in stresses of several hundred MPa which subsequently couple with the surrounding graphite materials where they are damped. Spatial energy deposition profiles were obtained by the Monte Carlo code FLUKA and the dynamic response was modelled using the implicit code ANSYS. Using advanced post-processing techniques, such as fast Fourier transformation and continuous wavelet transformation, different pressure wave components are identified and their contribution to the overall dynamic response of a two-body target and their failure mode are discussed. We show that selected low-intensity beam impacts can be simulated using straight-forward transient coupled thermal/structural implicit simulations. Carbon-fiber reinforced graphites exhibit large (macroscopic) mechanical strength, while their low-strength graphite matrix is identified as a potential source of failure. The dynamic response of low-density graphitic foams is surprisingly favourable, indicating promising properties for the application as high-power beam dump material.

Internal Friction in Glass Fiber- and Carbon Fiber-Reinforced Composites with a T-107 Matrix

2019 ◽  
Vol 64 (4) ◽  
pp. 535-539
Author(s):  
Yu. E. Kalinin ◽  
A. T. Kosilov ◽  
O. V. Ovdak ◽  
A. M. Kudrin ◽  
O. A. Karaeva ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Internal Friction ◽  
Glass Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Composites ◽  
Carbon Fiber Reinforced

Investigation of the Dynamic Response of a Multispot System at Joining Using Ultrasonic Welding

2021 ◽  
Author(s):  
Tae Hwa Lee ◽  
Pei-Chung Wang ◽  
S. Jack Hu ◽  
Mihaela Banu
Keyword(s):  
Carbon Fiber ◽  
Dynamic Response ◽  
Polymer Composite ◽  
Ultrasonic Welding ◽  
Thermoplastic Composite ◽  
Fiber Reinforced ◽  
Welding Sequence ◽  
Carbon Fiber Reinforced Composites ◽  
Carbon Fiber Reinforced ◽  
Welding Sequences

Abstract Ultrasonic welding is one of the most practical joining method for polymer composite materials and has been adapted in the aerospace and automotive industries. To effectively join polymer composite assemblies, it is critical to understand the dynamic response of the welding system so that sound heating generation and welding sequences in the ultrasonic welding of the assemblies can be properly obtained. This study presents a dynamic response model of a multi-spot configuration assembly using ultrasonic welding. Here, a dynamic model of joining a U-shaped carbon fiber reinforced thermoplastic composite part with a flat part is developed and analyzed through the ratio between the frequencies generated at different locations of the spot with respect to the edges of the assembly and the natural frequency. Finally, this ratio is correlated with the weld quality of the multiple spot configuration. Guidelines for designing multisport sequence are extracted. This study provides a method to design the welding sequence in ultrasonic welding of carbon fiber reinforced composites.

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

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