Analysis and evaluation of friction effects on mode II delamination testing

Mencattelli, Lorenzo; Borotto, Marco; Lazzeri, Roberta; Botsis, J.

doi:10.1016/j.compstruct.2018.01.085

Cited by 17 publications

(4 citation statements)

References 6 publications

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“…In compliance with the proposed methodology, load-displacement and S−N data have been extracted from reported data in [57], as depicted in figures 7 and 8 respectively. Node-to-surface interaction has been established between the bonded region of FST and HC, and hard contact normal behaviour along with tangential behaviour with friction formulation coefficient having a value of 0.8 [61,62]. Besides this, the unbonded region is again provided with a 'Penalty' constraint enforcement method to prevent any penetration of the facesheet in the honeycomb core.…”

Section:  Modelling and Simulationmentioning

confidence: 99%

Determination of Paris parameters from S−N curve in the simulation of fatigue in Nomex honeycomb sandwich structures

Tripurari

Jamil

2022

Mater. Res. Express

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Determination of S-N and Paris parameters form the two primary approaches as far as fatigue testing is concerned. With many economic factors and complexities involved in experimentation, these approaches are not related to each other and require implementation of separate test standards for both of them. In this work, an attempt is made on the interconvertibility of these experimental parameters and a numerical technique based on virtual crack closure technique (VCCT) is proposed for the evaluation of Paris parameters from S-N curve, corresponding to four-point bending end notched flexural (4ENF) sandwich specimen made up of Nomex® aramid honeycomb core with glass fibre reinforced composite (GFRP) facesheets. VCCT was effectively utilised for the estimation of strain energy release rates (SERR), in both 2D plane stress/strain and 3D conditions, which were compared with each other, and the resultant was incorporated with the S-N data for the determination of parameters of the Paris curve. These determined parameters were employed for the simulation of fatigue delamination growth by using “Direct Cyclic” step and compared with the results obtained from literature. The comparison revealed a good agreement between the two, thereby validating the proposed technique.

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Section:  Modelling and Simulationmentioning

confidence: 99%

Determination of Paris parameters from S−N curve in the simulation of fatigue in Nomex honeycomb sandwich structures

Tripurari

Jamil

2022

Mater. Res. Express

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“…All produced specimens had a total length of 280 mm. In order to optimize the use of material, the specimens for mode I, were cut in a width of 10 mm, expecting to follow a plane strain approximation according to Pappas and Botsis (2016), while the ones for mode II at 25 mm width, as in Mencattelli et al (2018). Specimen preparation and apparatus for the testing of the mode I experiments were the same with the ones reported in Pappas and Botsis (2016).…”

Section: Fracture Testsmentioning

confidence: 99%

“…Specimen preparation and apparatus for the testing of the mode I experiments were the same with the ones reported in Pappas and Botsis (2016). The corresponding ones for mode II were the ones reported in Mencattelli et al (2018) using the 4ENF configuration with ball bearings, mounted though in an MTS hydraulic testing machine equipped with a 100 kN load cell, since high loads were expected (loads up to 12 kN were finally measured). The choice of thickness of the aluminum panel was made to avoid any plastic deformation far from the crack front based on the range of anticipated toughness.…”

Section: Fracture Testsmentioning

confidence: 99%

Design optimization of a CFRP–aluminum joint for a bioengineering application

Pappas

Botsis

2019

Des. Sci.

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Lightweight design demands and complexity requirements of modern high-end structures in aerospace, automotive, sports and bioengineering can be successfully covered by a combination of fiber reinforced polymers (FRPs) with metallic components. Conventionally, mechanical locking is favored in integrating multi-material parts, avoiding bonded interfaces. The feasibility of a multi-material carbon FRP–aluminum structural component of a robotic exoskeleton, fabricated in a single step with the FRP directly cured on the aluminum domain, was investigated. To conduct the feasibility analysis, pertinent systematic FE modeling involving cohesive contact was employed to optimize the design, while strength and fracture testing were conducted to define the formed interfaces’ resistance. Sandblasting treatment was also investigated and compared with plain surfaces. The results show that the effect of residual stresses due to curing process governs the created joint’s durability. To reduce their effect, the local compliance of the multi-material components was altered by introducing a compliant layer along with modification of the aluminum domains’ local geometry in a manner that does not compromise the overall structural integrity. The interface stresses of the optimized geometry are a few times lower than the ones estimated for the initial design. The methodology adopted herein delivers some guidelines on treating such problems.

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“…Therefore, the mechanical performance of bamboo and concrete affects the quality of bonding between bamboo and concrete. Connectors plastically deformed before damaging bamboo and concrete [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

The Study Bolted Joints Strength in Bamboo-Concrete Composite

Yusra

2023

CEBEL

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Bamboo ropes assembled in parallel and filled with mortar to create a composite structure. This study uses fixed loads and uses the EYM method. The purpose of this study is to investigate how connection strength, maximum load and stiffness values in normal weight concrete. The concrete design 25MPa used for threaded connections with diameters of 6 mm, 8 mm, and length of 40 cm. This study provides a maximum stress analysis of bolted joint strength and joint behavior. In this test, the study yielded a P-max value of 88.25kN at 6 mm diameter and a P min value of 16.87kN at 6 mm diameter for each variation of the sample. The P-Max value for 8 mm diameter is 29.71kN and the P-Min value for 8 mm diameter is 10.1kN. The stiffness values for each variant with a K-Max value of 41.53kN for diameter six and a K-Min value of 0.96kN for diameter six are 1.98kN K-Max value and 1.98kN K-Min value for diameter 8 mm, 0.21kN for diameter eight. The lateral resistance gives the same result of 8.8kN as for the ones melting point model. The maximum value of the pivot strength at 6 mm diameter and 40% load is 41.53kN/mm2. The highest value of the 40% load test with a diameter of 8 mm is 1.98kN/mm2. Two angle variations used in the test: 45° and 60°. The angular change of the sample damaged during the test was 60°, and the sample damage was 8 mm in diameter.

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Analysis and evaluation of friction effects on mode II delamination testing

Cited by 17 publications

References 6 publications

Determination of Paris parameters from S−N curve in the simulation of fatigue in Nomex honeycomb sandwich structures

Determination of Paris parameters from S−N curve in the simulation of fatigue in Nomex honeycomb sandwich structures

Design optimization of a CFRP–aluminum joint for a bioengineering application

The Study Bolted Joints Strength in Bamboo-Concrete Composite

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