Browsing by Author "Neale, Geoffrey"
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Item Open Access An evaluation of large diameter through-thickness metallic pins in composites: dataset(Cranfield University, 2024-02-20 11:34) Neale, Geoffrey; Saaran, Vinodhen; Dahale, Monali; Skordos, AlexMechanical_Testing_Dataset: Tensile, compression and double canteliever beam experimental data mode_I_2mm_pin_job1.dat: Double canteliever beam simulation Marc input file. DCB_Simulation_output.xlsx: Double canteliever beam simulation results for load verses crack opening displacement.Item Open Access Characterisation of large diameter through-thickness metallic pins in composites(Cranfield University, 2022-09-29 14:53) Neale, Geoffrey; Saaran, Vinodhen; Dahale, Monali; Skordos, AlexPoster and extended abstract presented at the International Conference on Manufacturing of Advanced Composites (ICMAC 2022)Item Open Access An evaluation of large diameter through-thickness metallic pins in composites(Elsevier, 2024-03-24) Neale, Geoffrey; Saaran, Vinodhen; Dahale, Monali; Skordos, Alexandros A.There is increasing demand for functional through-thickness reinforcement (TTR) in composites using elements whose geometry exceeds limitations of existing TTR methods like tufting, stitching, and z-pinning. Recently, static insertion of large diameter TTR pins into heated prepreg stacks has proven a feasible and robust reinforcement process capable of providing accurate TTR element placement with low insertion forces and lower tow damage compared with existing methods for similar element sizes (>1mm diameter) like post-cure drilling. Local mechanical performance and failure mechanics of these pinned laminates are reported here. Laminates with a single statically inserted pins (1.2, 1.5, and 2.0 mm) can mostly retain their in-plane integrity alongside a local improvement in mode I delamination toughness in carbon fibre-benzoxazine laminates. Tensile strength is mostly unaffected by the pins resulting from delamination suppression, whereas there is up to a doubling of Young’s modulus. Compressive strength is significantly diminished (up to 42 %) in pinned laminates. Interlaminar toughness is improved, and peak toughness is pushed ahead of the crack as pin diameter increases. The lack of significant deterioration in in-plane tensile properties in pinned laminates produced using static insertion can expand the range and forms of materials that can be inserted compared to existing TTR.Item Open Access Insertion of large diameter through-thickness metallic pins in composites: dataset(Cranfield University, 2022-03-16 09:16) Neale, Geoffrey; Skordos, AlexForce vs Displacement Data.xlsx - Contains all the raw force versus displacement data for the insertion tests carried out in the associated publication.Thermal Ageing Analysis.xlsx - Contains the DSC data (time, temperature, rev heat capacity and rev heat flow) for Bx180-220 prepreg under ageing regimes in the associated publication.Item Open Access Material characterisation of large diameter through thickness reinforcing pins in composites(Cranfield University, 2022-09-29 14:57) Saaran, Vinodhen; Neale, Geoffrey; Skordos, AlexMSc individual research project poster (2021-2022) on large metallic through-thickness reinforcing pins in compsosites presented by Vinodhen Saraan. Presents an experimental characterisation of the pinned material behaviour.Item Open Access Thermomechanical behaviour of composites with embedded metallic pins(Cranfield University, 2022-09-29 14:29) Fu, yu; Neale, GeoffreyMSc individual research project poster (2021-2022) modelling the thermomechanical behaviour of large metallic through-thickness reinforcing pins in compsosites presented by Yu Fu. Presents an the development and validation of a local thermomechnical model around the pin placed in the composite.Item Open Access Z-direction heat transfer in composites hybridised with large diameter metallic pins(ICCM, 2023-08-04) Neale, Geoffrey; Fu, Y.; Skordos, Alexandros A.Continuous fibre reinforced polymer composites have a well-established track record of excellent structural performance but generally lack non-structural functionalities inherent in legacy materials like metals. As the range of applications for composites continues to expand beyond their traditional base in aerospace, and to meet ambitious ‘Net Zero’ targets, there is increasing demand for embedded functionality in composites, like electrical or thermal energy transfer, though which a multitude of other functionalities are derived. A particularly under addressed challenge is how to efficiently achieve significant z-direction (through-thickness) functionality, which is restricted by the planar nature of composite. Through- thickness reinforcement (TTR) is typically used to achieve improvements in outof-plane structural performance but can be applied to the integration of hybridising elements, like metallics, that can impart desired functionality. Here we demonstrate that composite hybridisation by the addition of large diameter (2 mm) metallic pins positively affects the z-direction transfer of thermal energy through carbon-benzoxazine composite without adverse effects on in-plane mechanical performance. This work conducts extensive mechanical and thermomechanical characterisation of the carbon-benzoxazine composite and the metal-composite hybridised system which feeds into the development of an experimentally validated macroscale (ply-level) representative volume element (RVE) finite element (FE) model. The FE model captures both thermal energy transfer and thermomechanical behaviour of the hybridised system during operation. Results show that highly conductive pins significantly improve the local thermal conductivity and act to accelerate heat flow through the hybridised system, reducing thermal lag through-the-thickness.