Effects of drilling strategies for CFRP/Ti stacks on static mechanical property and fatigue behavior of open-hole CFRP laminates

An, Qinglong; Zhong, Bingfu; Wang, Xianfeng; Zhang, Hongzhou; Sun, Xiaofeng; Chen, Ming

doi:10.1016/j.jmapro.2021.01.036

Cited by 38 publications

(11 citation statements)

References 28 publications

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“…Some studies have indicated surface roughness of the hole wall has an effect on the fatigue mechanical properties of CFRP [23,26], the low-temperature drilling process can greatly improve the surface quality of the hole wall [12][13][14][15][16][17][18][19][20], to compare the influence of a low-temperature drilling environment on the mechanical properties of CFRP, there must be a group of specimens drilling at room temperature whose roughness is similar to the specimens drilling at low temperature. So, it is necessary to measure the roughness of the hole wall.…”

Section: Drilling Surface Roughnessmentioning

confidence: 99%

Investigating the Effect of Low-Temperature Drilling Process on the Mechanical Behavior of CFRP

2022

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Previous research has found that lower temperature drilling is helpful to improve the hole quality of carbon fiber reinforced polymer (CFRP). However, the influence of the lower temperature drilling process on the mechanical behavior of composites is yet not fully understood. To examine the influence of the lower temperature drilling process on the mechanical behavior of CFRP, the open hole CFRP specimens used for mechanical tests were obtained with three cases: drilling with −25 °C/uncoated carbide drills/(1000 rpm, 0.02 mm/r), 23 °C/coated carbide drills/(4000 rpm, 0.03 mm/r), and 23 °C/uncoated carbide drills/(1000 rpm, 0.02 mm/r), respectively; corresponding, three groups of open-hole specimens are obtained: specimens drilling at low-temperature with low damage, specimens drilling at room-temperature with low damage and specimens drilling at room-temperature with low damage; the mechanical behavior of the three groups specimens were obtained by static tensile, tensile–tensile fatigue cyclic tests and residual tensile strength test. The results have shown that the mechanical properties of specimens with a low-temperature drilling process is lower than those of the specimen with a normal drilling process due to the better drilling quality. The damage accumulation in specimens was increased with the damage degree of the original hole, the greater the damage degree, the worse the mechanical properties.

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Section: Drilling Surface Roughnessmentioning

confidence: 99%

Investigating the Effect of Low-Temperature Drilling Process on the Mechanical Behavior of CFRP

2022

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“…Owing to the high thermalsensitivity and heterogeneous nature of FRTP, machining-induced defects (matrix smearing, thermal degradation, delamination, burr and surface cavity [1,26]) often occur under improper / sub-optimal machining conditions. Such defects not only affect the surface quality/assembly tolerance of the machined parts, but also compromise their reliability [27] and can lead to undesirable part rejection and wasteful power expenditure.…”

Section: Introductionmentioning

confidence: 99%

Process characteristics, damage mechanisms and challenges in machining of fibre reinforced thermoplastic polymer (FRTP) composites: A review

Luo

Catalanotti

et al. 2023

Preprint

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Fibre reinforced thermoplastic polymer (FRTP) composites have been used for a wide range of engineering applications (e.g. in transport, construction, energy, etc) due to their excellent mechanical properties and ease of repair and recycling. In recent years, FRTP is increasingly deployed as an alternative to conventional thermoset carbon fibre reinforced epoxy (CF/epoxy) composites, for the purpose of reducing the carbon footprint and contributing to a sustainable manufacturing agenda. Machining of FRTP remains an indispensable process to achieve rapid parts assembly whilst meeting stringent geometric tolerances. However, due to the heterogeneous structure and high thermal sensitivity of FRTP, a range of machining-induced damages (such as matrix smearing, thermal degradation, delamination, burr and surface cavity) often occur, leading to concerns on machined parts quality and reliability. To date, composite machining studies have been mostly focused on conventional thermoset CF/epoxy and there is a lack of an up-to-date, in-depth review of the latest advancement concerning the machining of FRTP. This paper provides a state-of-the-art overview on the recent developments in FRTP machining over the past decade, with a particular emphasis on machining characteristics, damage mechanisms as well as the challenges facing such manufacturing process. The purpose is to present the composite manufacturing community with a timely update, which may guide and inspire further research and development for future FRTP manufacturing.

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“…The main parameters, namely cutting speed and feed rate, are typically varied in the range from 10 m/min to 150 m/min and from 0.025 mm/rev to 0.1 mm/rev, respectively [ 3 ]. The good drill bit geometry for one-shot drilling was defined as drill point angle (135°–140°) [ 11 , 48 , 49 ], helix angle (22°–35°) [ 8 , 42 ], and clearance angle (5°–10°) [ 13 ]. Shu et al reported about the reduction in drilling temperature in CFRP from 160 °C to 90 °C, which corresponded to conventional and dedicated drill bit geometry with a double margin [ 50 ].…”

Section: Introductionmentioning

confidence: 99%

Application of ANN for Analysis of Hole Accuracy and Drilling Temperature When Drilling CFRP/Ti Alloy Stacks

et al. 2022

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Drilling of Carbon Fiber-Reinforced Plastic/Titanium alloy (CFRP/Ti) stacks represents one of the most widely used machining methods for making holes to fasten assemblies in civil aircraft. However, poor machinability of CFRP/Ti stacks in combination with the inhomogeneous behavior of CFRP and Ti alloy face manufacturing and scientific community with a problem of defining significant factors and conditions for ensuring hole quality in the CFRP/Ti alloy stacks. Herein, we investigate the effects of drilling parameters on drilling temperature and hole quality in CFRP/Ti alloy stacks by applying an artificial neuron network (ANN). We varied cutting speed, feed rate, and time delay factors according to the factorial design L9 Taguchi orthogonal array and measured the drilling temperature, hole diameter, and out of roundness by using a thermocouple and coordinate measuring machine methods for ANN analysis. The results show that the drilling temperature was sensitive to the effect of stack material layer, cutting speed, and time delay factors. The hole diameter was mainly affected by feed, stack material layer, and time delay, while out of roundness was influenced by the time delay, stack material layer, and cutting speed. Overall, ANN can be used for the identification of the drilling parameters–hole quality relationship.

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Effects of drilling strategies for CFRP/Ti stacks on static mechanical property and fatigue behavior of open-hole CFRP laminates

Cited by 38 publications

References 28 publications

Investigating the Effect of Low-Temperature Drilling Process on the Mechanical Behavior of CFRP

Investigating the Effect of Low-Temperature Drilling Process on the Mechanical Behavior of CFRP

Process characteristics, damage mechanisms and challenges in machining of fibre reinforced thermoplastic polymer (FRTP) composites: A review

Application of ANN for Analysis of Hole Accuracy and Drilling Temperature When Drilling CFRP/Ti Alloy Stacks

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