Abstract:Machining process of glass fiber composites usually induces delamination damage. The presence of delamination may cause changes in the mechanical characteristics of the composite structures. In this research, a comprehensive experimental study is performed to analyze the influence of different parameters such as thermal fatigue, lay-up arrangement, resin type, feed rate and cutting velocity on the delamination of glass fiber composites under different drilling processes. Besides, influence of ultrasonic vibrat… Show more
“…It should also be mentioned that ML 506 epoxy resin was used as resin. 15 Figure 1.The necessary components of composite ring specimen (ASTM D2290).…”
Section: Methodsmentioning
confidence: 99%
“…It should also be mentioned that ML 506 epoxy resin was used as resin. 15 Also, two different hole diameters (2 mm and 4 mm) are chosen to investigate the effects of the notch during thermal cycling. Each hole is produced using a vertical hole drilling machine as shown in Figure 2.…”
Section: Experiments Materialsmentioning
confidence: 99%
“…often leads to fatigue and failure of structures. 15,16 Many researches have been done on lifetime assessment of materials under thermal fatigue, 17 but there are fewer studies with particular focus on curved structures such as rings, tanks, and cylinders. Therefore, practical investigations are needed on the life assessment of the structures subjecting to cyclic loadings.…”
In this paper, different mechanical responses of polymer matrix composite rings under thermal cycling are analyzed. The polymer matrix composite rings are classified to un-notched and open-hole specimens and tested based on the naval ordnance laboratory-ring tensile test method. Internal pressure, fracture and surface degradation changes as a function of the hole diameter and number of cycles are investigated. Experimental results suggest that specimens with larger hole radius have more mechanical property variations during thermal cycling. Also, it is revealed that the mechanical properties of laminates degrade as a function of the number of cycles and the hole diameter. The results also demonstrate that long splitting fiber breakage is the main mode for the failure of un-notched specimens, whereas fiber breakage and fiber matrix debonding are the two main modes for the failure of open-hole specimens. Finally, a multiple regression model is proposed to predict the tensile response of un-notched and open-hole polymer matrix composite rings subjected to thermal cycling condition.
“…It should also be mentioned that ML 506 epoxy resin was used as resin. 15 Figure 1.The necessary components of composite ring specimen (ASTM D2290).…”
Section: Methodsmentioning
confidence: 99%
“…It should also be mentioned that ML 506 epoxy resin was used as resin. 15 Also, two different hole diameters (2 mm and 4 mm) are chosen to investigate the effects of the notch during thermal cycling. Each hole is produced using a vertical hole drilling machine as shown in Figure 2.…”
Section: Experiments Materialsmentioning
confidence: 99%
“…often leads to fatigue and failure of structures. 15,16 Many researches have been done on lifetime assessment of materials under thermal fatigue, 17 but there are fewer studies with particular focus on curved structures such as rings, tanks, and cylinders. Therefore, practical investigations are needed on the life assessment of the structures subjecting to cyclic loadings.…”
In this paper, different mechanical responses of polymer matrix composite rings under thermal cycling are analyzed. The polymer matrix composite rings are classified to un-notched and open-hole specimens and tested based on the naval ordnance laboratory-ring tensile test method. Internal pressure, fracture and surface degradation changes as a function of the hole diameter and number of cycles are investigated. Experimental results suggest that specimens with larger hole radius have more mechanical property variations during thermal cycling. Also, it is revealed that the mechanical properties of laminates degrade as a function of the number of cycles and the hole diameter. The results also demonstrate that long splitting fiber breakage is the main mode for the failure of un-notched specimens, whereas fiber breakage and fiber matrix debonding are the two main modes for the failure of open-hole specimens. Finally, a multiple regression model is proposed to predict the tensile response of un-notched and open-hole polymer matrix composite rings subjected to thermal cycling condition.
“…These advantages include good mechanical properties combined with lightweight due to high strength to weight ratio and high stiffness to weight ratio as well as good chemical resistance of polymeric composites 2 . Different types of fibers have been studied as reinforcements including synthetic fibers, such as, glass, 3 aramid 4 and carbon, 5 as well as natural fibers such as cotton, 6 jute, 7,8 ramie, 9 flax 10 and combination of natural and synthetic fibers 11,12 . Due to their high strength and low density relative to other fibers, carbon fiber composites are being extensively employed in structural applications where high strength and low weight is required 13 …”
In this study, high-performance polyethylene (HPPE) fiber-based needle punched nonwovens were interleaved in cross-plied woven carbon fabric/epoxy composite laminates to enhance their interlaminar and impact properties. The placement of needle punched nonwoven interleaves exhibited considerable enhancement in interlaminar shear strength (ILSS), impact damage tolerance, and compression after impact (CAI) strength of laminates as evidenced by higher interlaminar strength, less absorbed energy, higher elastic energy, reduced damage degree, reduced out-of-plane deformation, higher loadbearing capacity, and higher residual compressive strength as compared to control sample. In particular, the composite laminate with placement of interleaves in alternating sequence between carbon plies resulted in 205.76% increase in ILSS and 129, 103 and 85% increase in CAI at 10, 25, and 40 J impact energy, respectively. Moreover, damaged surface area and out-of-plane deformation reduced to 38.75% and 62.5%, respectively for the same specimen impacted at 40 J energy. These results suggest that the HPPE fiber-based needle punched nonwoven interleaving can be adopted as a simple and low-cost approach compared with other interleaving techniques, to enhance the resistance to delamination, impact performance, and damage tolerance of traditional structural laminates.
“…Principle of using vibration assisted machining methods was initially proposed by Kumabe [20]. Principle of the indicated technique is to add a frequency of up to 40 kHz with a low ultrasonic vibrational amplitude (2-30 μm) on the tool-workpiece [21]. Kato and Takeyama [22] stated machining force and chips size will be decreased in ultrasonic assisted drilling comparing to conventional drilling.…”
In this study, rotary ultrasonic assisted end grinding (RUAEG) of silicon nitride (Si 3 N 4) was discussed. In addition, comparison of RUAEG with conventional end grinding was carried out. Machining parameters effect on the process was experimentally and statistically distinguished. Moreover, interaction of the influential parameters was discussed and the optimum condition was obtained. It is concluded from interaction plots that ultrasonic vibration influence on surface roughness was greater in lower cutting depths and higher rotational speeds. Moreover, by RUAEG process, it could acquire higher material removal speed with lower thrust force. Exerting ultrasonic vibration on the tool was more influential comparing to other grinding parameters. From morphological examinations, that was concluded RUAEG of ceramics results in lower amount of scratches, diminishing grinding lines and smoothing the surface due to be knocked continuously by the tool.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
