The influence of hole quality on mechanical behavior and strain distribution of open‐hole <scp>CFRP</scp> laminates subject to different machining processes

Li, Maojun; Jiang, Xiaoqing; Su, Ting

doi:10.1002/pc.27099

Cited by 16 publications

(15 citation statements)

References 28 publications

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“…The laser processing material is based on continuous pulse ablation, so the ablation depth and thermal damage are related to the laser pulse overlap rate. And the overlap between adjacent pulses is expressed as 9 :

η goodbreak= 1 goodbreak- \frac{v}{r \cdot f}

where v is the laser scanning speed, r , and f are the laser spot diameter and the pulse laser repetition frequency, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…7 The CFRP samples were machined by abrasive water jet machining (AWJM) without heat affected zone (HAZ), but due to water jet impact led to carbon fiber pull-out and delamination. 8,9 Laser induced plasma micromachining (LIPMM) has the characteristics of small HAZ and thermal damage, [10][11][12] which is used to drill micro-hole in CFRP with small HAZ and excellent roundness. 13 However, the LIPMM process is only applied to process micro and nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…Some non‐traditional machining methods have been proposed for processing difficult‐to‐machine materials, significantly enhancing the mechanical and chemical properties of the components 7 . The CFRP samples were machined by abrasive water jet machining (AWJM) without heat affected zone (HAZ), but due to water jet impact led to carbon fiber pull‐out and delamination 8,9 . Laser induced plasma micromachining (LIPMM) has the characteristics of small HAZ and thermal damage, 10–12 which is used to drill micro‐hole in CFRP with small HAZ and excellent roundness 13 .…”

Section: Introductionmentioning

confidence: 99%

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Study on anisotropic heat transfer and thermal damage in nanosecond pulsed laser processing of CFRP

et al. 2023

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Nanosecond pulsed laser processing is an efficient method of processing carbon fiber reinforced plastic(CFRP), which is widely used in the manufacturing field of aviation, medical, and auto industries. The anisotropic heat transfer of carbon fiber is a key factor degrading the surface integrity of laser processing CFRP. So it is urgent to explore the significant mechanism of anisotropic heat transfer of laser interacting with CFRP. A novel numerical model considering anisotropic heat transfer was established to analyze heat transfer and thermal damage of CFRP laser machining. By comparison of simulation and experiments, the average error of ablation depth and width ranges from 4.71% to 15.09%, so the model could precisely simulate the CFRP laser machining. It demonstrates that the heat conductivity along the axial carbon fiber is higher than that along the radial, resulting in an elliptical ablation morphology. And when the laser scanning direction is parallel to the direction of the carbon fiber, deeper and narrower microgrooves can be obtained. In addition, laser processing at the edge of the CFRP plate causes serious heat accumulation, leading to severe thermal damage. The simulation and experiments were conducted to explore the effect of parameters including laser energy, scanning speed, and scanning space on the depth and width of laser ablation. A deeper micro‐channel with a smooth machined surface and small thermal damage was obtained when laser energy E = 0.275 mJ, scanning speed v = 630 mm/s, and scanning space h = 21 μm.

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η goodbreak= 1 goodbreak- \frac{v}{r \cdot f}

where v is the laser scanning speed, r , and f are the laser spot diameter and the pulse laser repetition frequency, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on anisotropic heat transfer and thermal damage in nanosecond pulsed laser processing of CFRP

et al. 2023

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“…On the other hand, the stress concentration around hole is related to the hole size, [32] shape, [1,33,34] drilling quality, [35] and its boundary conditions (filled hole), [36] even the environment. [37] For small holes, the strength value has a logarithmic linear relationship with the hole size that larger opening could be with lower strength, which is similar to the effect of crack size on the metal strength.…”

Section: Introductionmentioning

confidence: 99%

Analysis of tensile damage characteristics of single filled bolt hole in laminate

Zhang

Pan

et al. 2023

Polymer Composites

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The strength of filled bolt holes of composites is an important parameter in developing the bearing bypass envelope curves for bolted joint structures in engineering design. This paper presents the procedures of tensile failure strengths and damage for a laminate with a filled bolt hole. Tests of two different cases, open‐hole tension (OHT) and filled‐hole tension (FHT), were performed and repeated seven times, respectively. A new type of virtual testing based on the LaRC05 criteria coupling with XFEM crack technique was developed to predict and analyze the crack initiation and early propagation around the bolt hole in the laminates. Two analytical methods were also adopted to predict the residual strength for a laminate after drilling. The results show that the thinner sample would present a higher strength with the same material system. It is also shown that the virtual test can well capture the failure modes, revealing that the 0° fiber has a natural function of crack arrest, the 90° layers that are the fracture pioneers with matrix tensile failure trigger the fiber breakage of 0° layers, and the failure of 45° layers occurs at the last. Additionally, an interesting phenomenon is observed that the initial failure around the filled hole edge does not affect the structural stiffness. Finally, a good agreement is achieved among the experimental, analytical and numerical results. It suggests that the results could provide a valuable guidance for the design of multi‐bolted joint structure.

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“…Mechanical performance and durability of composites with open holes can be analyzed using open-hole tension (OHT) tests. [32][33][34][35][36] While research has explored the effect of open holes on synthetic composites, there is limited information on natural fiber and sustainable composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal cycling on open‐hole tensile strength of sustainable composites: An experimental investigation

Varikkadinmel,

Kaushik,

Singh

2023

Polymer Composites

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Sustainable composites are presently employed in applications where structural demands are minimal. Basalt fiber reinforced PLA (BFPLA) and polybutylene succinate (BFPBS) composites, incorporates bio‐based materials, offer the potential to reduce non‐renewable resource consumption and improve end‐of‐life disposal practices. Given the significance of thermal aging in semi‐structural applications and the necessity for open holes (notches) for installation and assembly, little is known about how thermal cycling (TC) affects the open‐hole strength of sustainable composites. This experimental work establishes a quantitative relationship between open‐hole strength and TC, taking into account varying abrasive waterjet pressures, and explores the impacts of thermal aging on the notch sensitivity, thermal, mechanical, and physical properties. BFPBS displayed better unnotched tensile strength and notched strength than pre‐thermal BFPLA specimens after they have been subjected to 100 TC ranging from −20 to 55°C. Thermal aging significantly influenced notch sensitivity, emphasizing its consideration in evaluating notch performance. This research provides a significant contribution to our current understanding of the effects of thermal aging on sustainable composites, enabling their informed application in a variety of industries and the results highlight their promising potential, in particular BFPBS, as strong alternative for medium load applications.Highlights Evaluated thermal aging effects on basalt fiber (BF) composites, revealing improved properties in BF/PBS composites after thermal cycles. Established quantitative link between mechanical behavior and thermal cycling using varying waterjet pressure values. Basalt fibers enhanced crystallinity and thermal stability of PLA and PBS polymers, showing promise for sustainable composites. Notch sensitivity impacted by thermal aging, underlining the importance of considering these effects in notch performance evaluation. BF/PBS composites demonstrated potential as robust alternatives for indoor products and sports equipment.

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The influence of hole quality on mechanical behavior and strain distribution of open‐hole CFRP laminates subject to different machining processes

Cited by 16 publications

References 28 publications

Study on anisotropic heat transfer and thermal damage in nanosecond pulsed laser processing of CFRP

Study on anisotropic heat transfer and thermal damage in nanosecond pulsed laser processing of CFRP

Analysis of tensile damage characteristics of single filled bolt hole in laminate

Effect of thermal cycling on open‐hole tensile strength of sustainable composites: An experimental investigation

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