scholarly journals Additive Manufacturing-Based In Situ Consolidation of Continuous Carbon Fibre-Reinforced Polycarbonate

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2450
Author(s):  
Andreas Borowski ◽  
Christian Vogel ◽  
Thomas Behnisch ◽  
Vinzenz Geske ◽  
Maik Gude ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Carbon Fibre ◽  
Bending Test ◽  
Thermoplastic Composites ◽  
Experimental Investigations ◽  
Material Structure ◽  
Three Point Bending ◽  
Continuous Fibre ◽  
Local Material

Continuous carbon fibre-reinforced thermoplastic composites have convincing anisotropic properties, which can be used to strengthen structural components in a local, variable and efficient way. In this study, an additive manufacturing (AM) process is introduced to fabricate in situ consolidated continuous fibre-reinforced polycarbonate. Specimens with three different nozzle temperatures were in situ consolidated and tested in a three-point bending test. Computed tomography (CT) is used for a detailed analysis of the local material structure and resulting material porosity, thus the results can be put into context with process parameters. In addition, a highly curved test structure was fabricated that demonstrates the limits of the process and dependent fibre strand folding behaviours. These experimental investigations present the potential and the challenges of additive manufacturing-based in situ consolidated continuous fibre-reinforced polycarbonate.

An investigation of in situ impregnation for additive manufacturing of thermoplastic composites

2021 ◽  
Vol 64 ◽  
pp. 972-981
Author(s):  
Daniel Kaczmarek ◽  
Daniel Walczyk ◽  
James Garofalo ◽  
Margaret Sobkowicz-Kline
Keyword(s):  
Additive Manufacturing ◽  
Thermoplastic Composites

Structural analysis of elastically bent organic crystals using in situ indentation and micro-Raman spectroscopy

2017 ◽  
Vol 53 (97) ◽  
pp. 13035-13038 ◽  
Author(s):  
Manish Kumar Mishra ◽  
Kamini Mishra ◽  
S. A. Syed Asif ◽  
Praveena Manimunda
Keyword(s):  
Raman Spectroscopy ◽  
Structural Analysis ◽  
Structural Dynamics ◽  
Bending Test ◽  
Organic Crystals ◽  
Three Point Bending ◽  
Micro Raman Spectroscopy

The structural dynamics of two elastically bendable, halogenated N-benzylideneaniline organic crystals were studied using an in situ three-point bending test and Raman spectroscopy.

scholarly journals Three-point bending study on the microscopic fracture behavior of pre-oxidized Cr-coated Zr-4 alloys

2021 ◽  
Vol 2076 (1) ◽  
pp. 012051
Author(s):  
Mingyue Du ◽  
Chenxue Wang ◽  
Jishen Jiang ◽  
Xianfeng Ma
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Fracture Behavior ◽  
Early Stage ◽  
Bending Test ◽  
Cracking Behavior ◽  
Three Point Bending ◽  
Crack Penetration ◽  
Cr Coating

Abstract In this study, an in situ three-point bending test was carried out to study the mechanical properties and cracking behavior of the Cr-coated Zr-4 alloy considering the effect of pre-oxidation. The results showed that high temperature pre-oxidation led to the formation of intermetallic ZrCr2 at the coating/substrate interface and an α-Zr(O) layer beneath the interface. During the three-point bending test, the Cr coating and Zr-4 substrate showed good plastic deformation. However, the brittle intermetallic ZrCr2 diffusion layer exhibited cracks in the early stage, which accelerated the crack penetration to the Cr coating and the Zr-4 substrate, leading to the pre-failure of the pre-oxidized sample.

scholarly journals Effect of marine environment on the behaviour of concrete structures reinforced by composite materials

2020 ◽  
Vol 21 (4) ◽  
pp. 407
Author(s):  
Chafika Djelal ◽  
Mardy Long ◽  
Abdelkader Haddi ◽  
Julien Szulc
Keyword(s):  
Marine Environment ◽  
Concrete Structures ◽  
Bending Test ◽  
Experimental Investigations ◽  
The North ◽  
Four Point Bending ◽  
Failure Loads ◽  
Four Point Bending Test ◽  
Living Organisms

This study deals with experimental investigations of beam performances in a marine environment. Two kinds of concrete beams, unreinforced and reinforced with carbon plates and carbon rods, are being tested. The first one is stored in a laboratory, the other is exposed to a marine environment located in the north of France. After 12 months, all beams are tested via a four-point bending test in a laboratory. Results obtained have shown that beams stored in marine environment have a better behaviour than those stored in laboratory. It should be noted that no damage has occurred on these beams. However, we observe a significant increase of load of about 32% to 48% causing the first crack observed on the beams stored in marine environment compared to those stored in the laboratory. This means that beams in situ offer increased stiffness and a slight gain of failure loads. This may be due to the development of living organisms (in a marine environment) which acted as additional adhesive and sealing, providing a protection of concrete structures against damage.

scholarly journals Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 910
Author(s):  
Michał Musiał ◽  
Tomasz Trapko ◽  
Jacek Grosel
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Stiffness ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Bending Test ◽  
Experimental Investigations ◽  
Cross Sectional ◽  
Three Point Bending ◽  
Reinforced Polymer ◽  
Externally Bonded

This paper presents experimental investigations of reinforced concrete (RC) beams flexurally strengthened with carbon fiber reinforced polymer (CFRP) strips. Seven 3300 mm × 250 mm × 150 mm beams of the same design, with the tension reinforcement ratio of 1.01%, were tested. The beams differed in the way they were strengthened: one of the beams was the reference, two beams were passively strengthened as precracked (series B-I), two beams were passively strengthened as unprecracked (series B-II) and two beams were actively strengthened as unprecracked (series B-III). Moreover, the strengthening parameters differed between the particular series. The parameters were: CFRP strip cross-sectional areas (series B-I, B-II) or prestressing forces (series B-III). The beams were statically loaded, up to the assumed force value, in the three-point bending test and deflections at midspan were registered. After unloading the beams were suspended on flexible ropes (the free-free beam system) and their eigenfrequencies were measured using operational modal analysis (OMA). The static measurements (deflections) and the dynamic measurements (eigenfrequencies) were conducted for the adopted loading steps until failure. Static stiffnesses and dynamic stiffnesses were calculated on the basis of respectively the deflections and the eigenfrequencies. The qualitative and quantitative differences between the parameters are described.

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