Effect of drilling-induced damage on the open hole flexural fatigue of carbon/epoxy composites

Haeger, Andreas; Grudenik, Manuel; Hoffmann, Michael J.; Knoblauch, Volker

doi:10.1016/j.compstruct.2019.02.025

Cited by 33 publications

(11 citation statements)

References 24 publications

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“…Polymer composites must be drilled with the optimized parameters to avoid drilling-induced damage. [31][32][33] As seen in given literature researchers mainly focused on the effects of different tools on delamination. But there isn't any comprehensive study that focuses on how different drill bits and coatings affects temperature generated around a drilled hole.…”

Section: Introductionmentioning

confidence: 99%

Effects of cutting temperature and process optimization in drilling of GFRP composites

Ertürk

Vatansever

Yarar

et al. 2020

Journal of Composite Materials

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The present work deals with temperature effects and parametric optimization in the drilling of continuous glass fiber reinforced epoxy composite. Drilling ability was examined operating a drilling system with different drill bits, feed rate, and spindle speed parameters. The investigation was performed by changing the tool and composite interface. Drilling experiments were carried out under the dry condition. Thrust force and drilling temperatures were measured using dynamometer and thermal camera. Peel-up and push-out delamination were evaluated using an image analyzing tool. Results show that the tribo-mechanical behavior of the drilling operation is affected at different levels by tool coating. This behavior is related to the intrinsic friction properties of coating nature. Response surface methodology was used in the evaluation of experiment results. The feed rate of 0.13 mm/rev, spindle speed of 2425 rpm and HSS-TiN drill bit are found as an optimum drilling parameters and drill type.

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Section: Introductionmentioning

confidence: 99%

Effects of cutting temperature and process optimization in drilling of GFRP composites

Ertürk

Vatansever

Yarar

et al. 2020

Journal of Composite Materials

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“…However, the bottom Al sheet is joined only by the existing adhesive between the two Al sheets. The figures show that cracks within the CFRP are present near the rivet head, which could have an adverse effect on the fatigue performance under cyclic loading [27,28]. Additionally, non-uniform contacts between the rivet legs and the Al sheets are shown, resulting from an uneven deformation of CFRP within the rivet shank cavity.…”

Section: Self-piercing Riveted Joint Of Vibration-damping Aluminum and Cfrpmentioning

confidence: 99%

A Quality Study of a Self-Piercing Riveted Joint between Vibration-Damping Aluminum Alloy and Dissimilar Materials

2020

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This study investigates the quality of self-piercing riveted joints between vibration-damping aluminum (Al) and other dissimilar materials, namely aluminum alloy (AL5052-H32), steel alloy (GA590DP), and carbon-reinforced plastic (CFRP). The effects of die types (flat, cone, and nipple) on the geometrical characteristics and mechanical performance of the joints are studied using a cross-section examination and tensile shear load testing. The failure modes of each joint are also presented, showing the nature of the forces leading to the joint failures. The results indicate that, for all configurations, adequate joining between vibration-damping Al with AL5052-H32 is expected with a maximum shear load up to 3.28 kN. A shear load up to 3.6 kN was measured for the joints with GA590DP panels with acceptable top and bottom seal characteristics. A vibration-damping Al panel can only be positioned at the bottom when riveting with CFRP due to the brittle nature of CFRP. A tensile shear load up to 2.26 kN was found, which is the lowest amongst the materials tested in this study.

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“…Structural applications generally use mechanical joints to connect components to composite components because they are easy to disassemble. However, holes in CFRP composites are common and inevitable 8–12 . Bearing capacity may be reduced because holes are vulnerable to large stress concentrations, often resulting in unexpected combination failures.…”

Section: Introductionmentioning

confidence: 99%

Progressive damage and tensile failure of open‐hole carbon fiber polymer composites reinforced by carbon nanotubes

Han

Zhou

Ding

2022

J of Applied Polymer Sci

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Progressive damage and tensile failure of open‐hole carbon fiber/carbon nanotube reinforced composites with different off‐axis angles were detected by acoustic emission and Micro‐CT. K‐mean clustering algorithm can be utilized to post‐process signals of acoustic emission. Three critical points including linear growth point, near maximum load point and failure point, were selected to study progressive damage. Results indicated that stiffness variable decreased with the increase of off‐axis angle. When the off‐axis angle was 0°, higher initial stress and catastrophic brittle fracture characteristics can be obtained, whereas pseudo‐ductile behavior can be observed when off‐axis angles were 30° and 45° because of the alignment of yarn (fiber trellising) and the matrix plasticity. Due to the symmetrical structure of plain texture, there was a very interesting phenomenon that the tensile strength of composite specimen with 45° off‐axis angle was 23.65% higher than that of the specimen with an off‐axis angle of 30°. In the second stage of loading, the slope drop sharply when the load reached first key point, and Kaiser Effect can be observed. Acoustic emission technology and Micro‐CT method are beneficial to damage assessment of complex composites.

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Effect of drilling-induced damage on the open hole flexural fatigue of carbon/epoxy composites

Cited by 33 publications

References 24 publications

Effects of cutting temperature and process optimization in drilling of GFRP composites

Effects of cutting temperature and process optimization in drilling of GFRP composites

A Quality Study of a Self-Piercing Riveted Joint between Vibration-Damping Aluminum Alloy and Dissimilar Materials

Progressive damage and tensile failure of open‐hole carbon fiber polymer composites reinforced by carbon nanotubes

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