scholarly journals Investigation of Damage Reduction When Dry-Drilling Aramid Fiber-Reinforced Plastics Based on a Three-Point Step Drill

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5457
Author(s):  
Fu-Ji Wang ◽  
Meng Zhao ◽  
Jian-Bo Yan ◽  
Shen Qiu ◽  
Xin Liu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Drilling Parameters ◽  
Fiber Deformation ◽  
Cutting Model ◽  
Step Drill

Aramid fiber-reinforced plastic (AFRP) is widely used in bullet-proof and armor structures, and is difficult to drill because of the high-toughness aramid fibers with ductile fracturing—differently from carbon fiber. Therefore, drilling quality cannot be ensured by the drilling used for carbon fiber-reinforced plastic, and frequently, delamination and burrs occur in the drilling process. This article first established a two-dimensional cutting model for analyzing the fiber deformation and material interface cracking. According to the model, reducing the thrust force and the radial force of the edge on the fibers is an effective way to reduce the fiber deformation, and a three-point step drill is proposed further. Comparative experiments were carried out among twist drilling, candle core drilling and three-point step drilling under three drilling parameters. The results show that the three-point step drill changed the traditional cutting behavior on the drill-exit material into a compound process. Finally, the AFRP was cut effectively with the novel drill with a small thrust force, and the delamination and “burrs area” were reduced through different drilling parameters. In summary, the three-point step drill can drill the AFRP without delamination and burrs with 0.02 mm/rev, which provides a new solution of cost-effective production for AFRP manufacturers.

Surface damage reduction of dry milling carbon fiber reinforced plastic/polymer using left–right edge milling tool

2020 ◽  
Vol 39 (11-12) ◽  
pp. 409-421 ◽  
Author(s):  
Fu-Ji Wang ◽  
Jian-Bo Yan ◽  
Meng Zhao ◽  
Dong Wang ◽  
Xiao-Nan Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Concentrated Force ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Milling Tool ◽  
Carbon Fiber Reinforced ◽  
Cutting Model

Carbon fiber reinforced plastic/polymer is popular for aerospace structures and these structures require milling with desired configuration and integrity within strict damage tolerance. However, due to the influence of cutting thrust force on the surface materials when milling carbon fiber reinforced plastic/polymer, it is easy to cause surface damages. This article aimed to study the effect of cutting thrust force direction and size on the damages and guided the suitable milling tool and cutting parameters, further to propose a milling method with low damages. The two-dimensional cutting model was established successfully for analyzing the tool–composite contact and the fiber–plastic/polymer interface crack. Based on the model, the cutting direction forward inside and small cutting force are the ways to avoiding the burrs and tears. The thrust force was the main concentrated force causing the damages in milling, so the left–right edge milling tool was proposed to realize cutting fibers to inside for both surfaces. Besides, small feed per tooth is an effective way to reduce the force. Therefore, the left–right edge milling tool with small feed per tooth is low-damages method. Comparative milling experiments are carried out to verify the method, from the result, the burrs, tears and delamination are effectively inhibited.

Monitoring of hole surface integrity in drilling of bi-directional woven carbon fiber reinforced plastic composites

2020 ◽  
Vol 234 (12) ◽  
pp. 2432-2458 ◽  
Author(s):  
Tarakeswar Barik ◽  
Kamal Pal ◽  
Smruti Parimita ◽  
Priyabrata Sahoo ◽  
Karali Patra
Keyword(s):  
Carbon Fiber ◽  
Feed Rate ◽  
Thrust Force ◽  
Internal Surface ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Circularity Error ◽  
Drill Point

Fiber-reinforced plastic is one of the top priorities lightweight materials with excellent mechanical properties for the aerospace industries in recent years. However, it is difficult to machine despite having unique properties due to its non-homogeneous and abrasive nature in alternate fiber and matrix layers. Thus, it is found to be a challenging task to drill hole on such hard-to-machine materials, which is highly essential for the development of most of the engineering structural components. The present work addresses various drilling-induced defects such as delamination, circularity error, and roughness variations in the hole surface during drilling of quasi-isotropic cross-fiber oriented bi-directional woven-type carbon fiber reinforced plastic laminate using a full factorial design of experiments for different drill geometry. The response surface methodology was considered for the regression model development, which was found to be highly significant. The machining forces with associated torque have also been acquired during drilling, which was divided and further analyzed in time domain to correlate with drilling flaws. The drilling-induced delamination was found to be higher at a high feed rate using a higher drill point angle due to substantial thrust force generation at the initial stages in the drilling cycle. However, the internal surface finish with associated circularity error was reduced for higher spindle speed with less feed rate using a low drill point angle because of low torque fluctuation at the final drilling phases. The axial thrust force was found to be a prime indicator of drilled hole surface delamination, whereas drilling torque precisely indicated internal surface roughness as well as circularity error. The global root mean square, along with a local peak of thrust and torque, both were highly essential to completely characterize the drilled hole quality.

Study on the Mechanical Properties of Carbon Fiber Composite Material of Wood

2015 ◽  
Vol 1120-1121 ◽  
pp. 659-663
Author(s):  
De Jun Shen ◽  
Zi Sheng Lin ◽  
Yan Fei Zhang
Keyword(s):  
Carbon Fiber ◽  
Glass Fiber ◽  
Aramid Fiber ◽  
Polymerization Process ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Fiber Reinforced Plastic ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic

through the use of domestic carbon fiber cloth and combining domestic fast-growing wood of Larch and poplar wood, the CFRP- wood composite key interface from the composite process, stripping bearing performance, Hygrothermal effect, fracture characteristics and shear creep properties to conducted the system research . Fiber reinforced composite (Fiber Reinforced Plastic/Polymer, abbreviation FRP) material by continuous fibers and resin matrix composite and its types, including carbon fiber reinforced composite (Carbon Fiber Reinforce Plastic/Polymer, abbreviation CFRP), glass fiber reinforced composite (Glass Fiber Reinforced Plastic/Polymer, abbreviation GFRP) and aramid fiber reinforced composite (Aramid Fiber Reinforced Plastic/Polymer, abbreviation AFRP). PAN based carbon fiber sheet by former PAN wires, PAN raw silk production high technical requirements, its technical difficulty is mainly manifested in the acrylonitrile spinning technique, PAN precursor, acrylonitrile polymerization process with solvent and initiator ratio. Based on this consideration, the subject chosen by domestic PAN precursor as the basic unit of the CFRP as the object of study.

Machinability of drilling T700/LT-03A carbon fiber reinforced plastic (CFRP) composite laminates using candle stick drill and multi-facet drill

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540031 ◽  
Author(s):  
Cheng-Dong Wang ◽  
Kun-Xian Qiu ◽  
Ming Chen ◽  
Xiao-Jiang Cai
Keyword(s):  
Carbon Fiber ◽  
Feed Rate ◽  
Composite Laminates ◽  
Thrust Force ◽  
Spindle Speed ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Drilling Parameters ◽  
Cfrp Composite

Carbon Fiber Reinforced Plastic (CFRP) composite laminates are widely used in aerospace and aircraft structural components due to their superior properties. However, they are regarded as difficult-to-cut materials because of bad surface quality and low productivity. Drilling is the most common hole making process for CFRP composite laminates and drilling induced delamination damage usually occurs severely at the exit side of drilling holes, which strongly deteriorate holes quality. In this work, the candle stick drill and multi-facet drill are employed to evaluate the machinability of drilling T700/LT-03A CFRP composite laminates in terms of thrust force, delamination, holes diameter and holes surface roughness. S/N ratio is used to characterize the thrust force while an ellipse-shaped delamination model is established to quantitatively analyze the delamination. The best combination of drilling parameters are determined by full consideration of S/N ratios of thrust force and the delamination. The results indicate that candle stick drill will induce the unexpected ellipse-shaped delamination even at its best drilling parameters of spindle speed of 10,000 rpm and feed rate of 0.004 mm/tooth. However, the multi-facet drill cutting at the relative lower feed rate of 0.004 mm/tooth and lower spindle speed of 6000 rpm can effectively prevent the delamination. Comprehensively, holes quality obtained by multi-facet drill is much more superior to those obtained by candle stick drill.

Laminate Orientation Effect on Drilling of Carbon Fiber Reinforced Plastic Composites

2013 ◽  
Vol 315 ◽  
pp. 768-772
Author(s):  
Ismail Mahamad Hakimi ◽  
S. Sharif ◽  
Denni Kurniawan
Keyword(s):  
Carbon Fiber ◽  
Fiber Orientation ◽  
Thrust Force ◽  
Machining Process ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Cfrp Composites ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced plastic (CFRP) composites are often used in combination with other materials, requiring it to be machined during fabrication of a structure. Drilling as the most common machining process of CFRP is complex often results in delamination of the composites. The complexity is contributed by CFRP composites fiber orientation which can be of unidirectional or quasi-isotropic type depending on the applications. This study reviews the machinability of CFRP composites by considering fiber orientation and machining conditions used during drilling. Their relation with machining thrust force which leads to delamination is the central theme. An insight in obtaining delamination-free holes is also discussed.

scholarly journals Multiple Sensor Monitoring of CFRP Drilling to Define Cutting Parameters Sensitivity on Surface Roughness, Cylindricity and Diameter

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2796 ◽  
Author(s):  
Miguel Álvarez-Alcón ◽  
Luis Norberto López de Lacalle ◽  
Francisco Fernández-Zacarías
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Electric Power ◽  
Thrust Force ◽  
Cutting Speed ◽  
Carbon Fiber Reinforced Plastic ◽  
Machining Parameters ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Machining parameters affects the final quality of components made in carbon fiber reinforced plastic (CFRP) composite materials. In this framework, the work here presented aims at studying the right combination of cutting speed (vc) and feed rate (vf), for dry drilling of carbon fiber reinforced plastic composite materials, which obtained better results regarding roughness, hole cylindricity, and diameter. A series of experimental tests were carried out under different drilling conditions (vc/vf), monitoring the thrust force (Fz), torque (T), and electric power (EP), to define which one can help more for industrial daily life production. Results validation was carried out using the analysis of variance, in order to relate main machining parameters cutting speed and linear feed, with thrust force, drilling torque, main spindle electric power and hole quality parameters (average roughness, cylindricity and diameter). The conclusions show that thrust force is not proportional to the cutting speed and the best combinations of cutting speed and feed were found out around the average values of tested parameters. Spindle electric power is an interesting element to take into account because it is easy to consider in real production.

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