Mode I delamination onset in carbon fibre reinforced SiC: Double cantilever beam testing and cohesive zone modelling

Hofmann, Severin

doi:10.1016/j.engfracmech.2017.05.018

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…It is difficult to determine the critical energy release rate for the mechanical properties of the SiC deposition. The critical energy release rate of carbon reinforced SiC matrix composite is reported to be 0.1–0.53 mJ/mm 2 [ 32 , 33 , 34 , 35 ]. Here, as shown in Figure 8 , the models with different critical energy release rates (0.05 mJ/mm 2 , 0.1 mJ/mm 2 , and 0.15 mJ/mm 2 ) are calculated respectively.…”

Section: Numerical Modellingmentioning

confidence: 99%

Experimental and Numerical Investigation on C/SiC Composite Z-Pinned/Bonded Hybrid Single-Lap Joints

Wang

Guan

et al. 2021

Materials

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Z-pinned/bonded joints are great potential connection components that have been used in the 2D C/SiC composite structures; however, the hybrid joints present complex failure mechanism considering the secondary deposited SiC matrix in the clearance. Therefore, the mechanical performance and failure mechanism of the joints are investigated through experimental and numerical methods in this paper. Experiment results show that two peaks exist in the load–displacement curves. The first load peak is 2891–4172 N with the corresponding displacement of 0.10–0.15 mm, and the second load peak is 2670–2919 N with the corresponding displacement of 0.21–0.25 mm. Besides that, the secondary deposited SiC matrix exhibits discrete distribution, and it has significant effects on the failure mechanism. Validated by experimental data, the proposed three-dimensional numerical model based on modified Hashin’s criterion and fastener element can predict the mechanical performance and failure process. The numerical results indicate that the first load peak is dominated by the deposited SiC matrix near the edge, while the second peak is dominated by the z-pin and the SiC matrix near the z-pin. Moreover, the effects of the deposited SiC matrix’s strength and distribution are discussed, which is meaningful to the optimal design of C/SiC composite z-pinned/bonded hybrid single-lap joints.

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Section: Numerical Modellingmentioning

confidence: 99%

Experimental and Numerical Investigation on C/SiC Composite Z-Pinned/Bonded Hybrid Single-Lap Joints

Wang

Guan

et al. 2021

Materials

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“…The bending stiffness was adopted to evaluate the flexibility of monofilaments before and after modification, and the testing principle was a cantilever beam method. 26 In order to gain more accurate results, the testing parameters were selected after several trials. Moreover, the final result was expressed with an average value and a standard deviation of three replicates.…”

Section: Mechanical Characterizationsmentioning

confidence: 99%

Surface modification of polylactic acid (PLA) and polyglycolic acid (PGA) monofilaments via the cold plasma method for acupoint catgut-embedding therapy applications

Zhang

2019

Textile Research Journal

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Polylactic acid (PLA) and polyglycolic acid (PGA) monofilaments have been the most recently, widely used acupoint catgut-embedding therapy (ACET) biodegradable materials. However, their poor hydrophilicity and cell adhesion are common limitations during applications. To improve their surface properties, modification technologies should be generally applied. This paper firstly adapted polymer chips to produce four types of PLA and PGA monofilaments, and then attempted cold oxygen plasma treatment for surface modification. Afterwards, the modified monofilaments were fully characterized with respect to structure, mechanical and in vitro properties. The results showed that both the PLA and PGA monofilaments became coarser after modification, and their hydrophilicity was improved, while their weight and diameter sizes were slightly decreased. The tensile properties and flexibility of the modified samples changed little, and their swelling ratio increased sharply. All the prepared samples exhibited good cell viability, with more than 75% of cells being viable. Sample PM-PLA2 (plasma-modified PLA2) and sample PM-PGA2 (plasma-modified PGA2) presented the largest cell attachment ratio (cultured for 48 h) at 52.16% ± 1.05% and 58.39% ± 2.07%, respectively. In sum, this cold plasma method successfully improved the hydrophilicity and in vitro properties of PLA and PGA monofilaments, while retaining the other excellent properties, and warrants further study to develop new PLA and PGA-embedding materials with outstanding clinical efficacy.

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“…The bending stiffness was used to represent flexibility of samples, and the test standard was according to cantilever beam method. 44 To achieve accurate results, test parameters were selected after several trials. Meanwhile, the final result was expressed with an average value and a standard deviation of 10 replicates.…”

Section: Flexibilitymentioning

confidence: 99%

Surface modification of polylactic acid and poly (D, L-lactide-co-glycolide) biodegradable materials via chitosan-coating treatment: A new approach for developing novel antibacterial acupoint catgut embedding materials

Zhang

2018

Textile Research Journal

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Surgical site infections are liable to cause significant postoperative morbidity and increase health costs. However, polylactic acid and poly (D,L-lactide-co-glycolide) acupoint catgut-embedding therapy materials used to stimulate certain points for curing diseases are typically devoid of antibacterial activity. Here we report novel polylactic acid and poly (D,L-lactide-coglycolide) embedding materials with effective antibacterial properties via chitosan-coating treatment that retained their inherent excellent characteristics. To achieve more comprehensive properties, polylactic acid polymer chips and poly (D,Llactide-co-glycolide) multifilaments were adopted to fabricate embedding materials, and their preparation processes were studied. Meanwhile, a new one-dip-one-rolling coating system was designed and established in this work. Afterwards, characterizations such as fundamental properties, mechanical properties and biocompatibility were explored. The results showed that both the polylactic acid and poly (D,L-lactide-co-glycolide) groups with covered chitosan layers showed a different increase in weight and diameter. FT-IR analysis indicated that there were interactions between the pure embedding materials and chitosan molecules, the present of hydroxyl group (-OH) and some polar bonds such as (N-H) amide II and (C=O) amide I would be benefit for the hydrophilicity of modified materials. Chitosan-coated polylactic acid monofilaments in group 2 (breaking strength ¼ 31.26 AE 1.62 cN/dtex, breaking elongation ¼ 34.82 AE 5.21%) and chitosan-coated poly (D,Llactide-co-glycolide) braiding threads in group 2 (breaking strength ¼ 92.58 AE 1.69 cN/dtex, breaking elongation ¼ 73.39 AE 2.38%) showed better mechanical properties. Antibacterial efficacy and cell cytocompatibility of polylactic acid and poly (D,L-lactide-co-glycolide) groups were greatly enhanced after coating. The degradation behaviors were slowed down, providing a longer-lasting effect during the treatment process. In conclusion, the modified polylactic acid and poly (D,L-lactide-co-glycolide) embedding materials with good, comprehensive performance presented great potential in acupoint catgut-embedding therapy clinical applications. Keywords surgical site infections, polylactic acid, poly(D,L-lactide-co-glycolide), antibacterial properties, chitosan Acupoint catgut-embedding therapy (ACET) research is a promising acupuncture treatment, characterized by the insertion of biodegradable materials into some parts of human body. 1,2 Once inserted, embedded materials in the acupoints will produce a series of stimulation effects to cure the disease concerned. 3 In this field, ACET has attracted much attention because of its inherent

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Mode I delamination onset in carbon fibre reinforced SiC: Double cantilever beam testing and cohesive zone modelling

Cited by 15 publications

References 17 publications

Experimental and Numerical Investigation on C/SiC Composite Z-Pinned/Bonded Hybrid Single-Lap Joints

Experimental and Numerical Investigation on C/SiC Composite Z-Pinned/Bonded Hybrid Single-Lap Joints

Surface modification of polylactic acid (PLA) and polyglycolic acid (PGA) monofilaments via the cold plasma method for acupoint catgut-embedding therapy applications

Surface modification of polylactic acid and poly (D, L-lactide-co-glycolide) biodegradable materials via chitosan-coating treatment: A new approach for developing novel antibacterial acupoint catgut embedding materials

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