Interlaminar Toughness of Fusion Bonded Thermoplastic Composites PDF Download
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Author: Francisco Raúl Sacchetti
Publisher:
ISBN: 9789036543781
Category :
Languages : en
Pages : 114
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Book Description
Thermoplastic composites are of increasing interest to the aerospace industry. The melt-processability of the thermoplastic matrix allows for fast manufacturing and assembling techniques, such as thermoforming and fusion bonding, which are also highly suitable for process automation. Fusion bonding involves heating of the interface between the parts to be bonded, application of pressure and finally cooling of the bonded parts. Even though successful commercial application of fusion bonding can already be found in the aerospace industry, a wider use requires additional developments in order to improve the predictability, reliability and robustness of fusion bonded joints. This first of all requires a better understanding of that what is perceived as ‘the load bearing capacity’, as measured by mechanical testing of fusion bonded joints.Two mechanisms that are essential for the generation of the load bearing capacity of fusion bonded joints are (i) intimate contact development, followed by (ii) the interdiffusion of polymer chains across the interface. Although these two mechanisms are a prerequisite for the development of a bond, they are not the only mechanisms that determine the performance of a fusion bonded joint. The physical state of the bond line and the structural morphology of the interface also plays an important role. The objective of this work is to identify, to analyse and, when possible, to quantify the relation between the physical state and the structural morphology induced by the fusion bonding process, and the resulting mechanical performance of the joints. For this purpose, the most relevant variations in physical state and structural morphology, as induced by the fusion bonding process, were identified. These factors were then isolated experimentally, and their effects on the interlaminar fracture toughness of the joints were studied.
Author: Francisco Raúl Sacchetti
Publisher:
ISBN: 9789036543781
Category :
Languages : en
Pages : 114
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Book Description
Thermoplastic composites are of increasing interest to the aerospace industry. The melt-processability of the thermoplastic matrix allows for fast manufacturing and assembling techniques, such as thermoforming and fusion bonding, which are also highly suitable for process automation. Fusion bonding involves heating of the interface between the parts to be bonded, application of pressure and finally cooling of the bonded parts. Even though successful commercial application of fusion bonding can already be found in the aerospace industry, a wider use requires additional developments in order to improve the predictability, reliability and robustness of fusion bonded joints. This first of all requires a better understanding of that what is perceived as ‘the load bearing capacity’, as measured by mechanical testing of fusion bonded joints.Two mechanisms that are essential for the generation of the load bearing capacity of fusion bonded joints are (i) intimate contact development, followed by (ii) the interdiffusion of polymer chains across the interface. Although these two mechanisms are a prerequisite for the development of a bond, they are not the only mechanisms that determine the performance of a fusion bonded joint. The physical state of the bond line and the structural morphology of the interface also plays an important role. The objective of this work is to identify, to analyse and, when possible, to quantify the relation between the physical state and the structural morphology induced by the fusion bonding process, and the resulting mechanical performance of the joints. For this purpose, the most relevant variations in physical state and structural morphology, as induced by the fusion bonding process, were identified. These factors were then isolated experimentally, and their effects on the interlaminar fracture toughness of the joints were studied.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722316860
Category :
Languages : en
Pages : 34
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Book Description
Edge delamination tension and double cantilever beam tests were used to characterize the interlaminar fracture toughness of continuous graphite-fiber composites made from experimental thermoplastic polyimides and a model thermoplastic. Residual thermal stresses, known to be significant in materials processed at high temperatures, were included in the edge delamination calculations. In the model thermoplastic system (polycarbonate matrix), surface properties of the graphite fiber were shown to be significant. Critical strain energy release rates for two different fibers having similar nominal tensile properties differed by 30 to 60 percent. The reason for the difference is not clear. Interlaminar toughness values for the thermoplastic polyimide composites (LARC-TPI and polyimidesulfone) were 3 to 4 in-lb/sq in. Scanning electron micrographs of the EDT fracture surfaces suggest poor fiber/matrix bonding. Residual thermal stresses account for up to 32 percent of the strain energy release in composites made from these high-temperature resins. Hinkley, J. A. and Johnston, N. J. and Obrien, T. K. Langley Research Center RTOP 505-63-01-01...
Author: J. A. Hinkley
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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Book Description
Author: C. Ageorges
Publisher: Springer Science & Business Media
ISBN: 1447101715
Category : Technology & Engineering
Languages : en
Pages : 285
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Book Description
Fusion bonding is one of the three methods available for joining composite and dissimilar materials. While the other two, mechanical fastening and adhesion bonding, have been the subject of wide coverage both in textbooks and monographs, fusion bonding is covered here substantially for the first time. Fusion bonding offers a number of advantages over traditional joining techniques and it is anticipated that its use will increase dramatically in the future because of the rise in the use of thermoplastic matrix composites and the growing necessity for recyclability of engineering assemblies. Fusion Bonding of Polymer Composites provides an in-depth understanding of the physical mechanisms involved in the fusion bonding process, covering such topics as: - heat transfer in fusion bonding; - modelling thermal degradation; - consolidation mechanisms; - crystallisation kinetics; - processing-microstructure-property relationship; - full-scale fusion bonding; - fusion bonding of thermosetting composite/thermoplastic composite and metal/thermoplastic joints. The book focuses on one practical case study using the resistance welding process. This example exposes the reader to the development of processing windows for a novel manufacturing process including the use of experimental test programmes and modelling strategies.
Author: Haibin Ning
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 1501511610
Category : Technology & Engineering
Languages : en
Pages : 369
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Book Description
The book covers various thermoplastic composites, including continuous and discontinuous fiber thermoplastic composites. It describes processing methods and explains the effect of different processing parameters on the structure and performance of thermoplastic composites. Characterization and mechanics of the composite are also discussed in the book.
Author: Norman Joseph Johnston
Publisher:
ISBN:
Category : Thermoplastic composites
Languages : en
Pages : 18
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Book Description
Author: Roderic C. Don
Publisher:
ISBN:
Category : Thermoplastics
Languages : en
Pages : 35
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Book Description
The efficiency of the welded joints is quantified by comparing test results to compression molded lap shear strength. A rapid increase in strength that asymptotically approaches the compression molded baseline is measured. In general, resistance welded APC-2 with PEEK film requires longer process times, with fiber motion occurring at the joint, to achieve a maximum lap shear strength of 44.8±7.6 MPa. The APC-2/PEI resistance welded specimens achieved a maximum strength of 35.9±1.0 Mpa in shorter time with no fiber motion. The baseline for the APC-2/PEI was determined from isothermal processing (1200 sec at 293°C) to be 43.6±3.8 MPa."
Author: Sylvie Beland
Publisher: William Andrew
ISBN: 0815517904
Category : Technology & Engineering
Languages : en
Pages : 185
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Book Description
Recent developments in high performance thermoplastic resins and their composites are described in this book, and the benefits and limitations of these emerging materials are assessed for aerospace and other applications. Discussions on the performance of neat and continuous fiber reinforced thermoplastic resins in terms of their properties and environmental and chemical resistance are provided.
Author: P. G. Kelleher
Publisher: iSmithers Rapra Publishing
ISBN: 9780902348783
Category : Technology & Engineering
Languages : en
Pages : 140
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Book Description
This report covers semi and non-crystalline thermoplastics, polymer blends and various classes of reinforcing fibres, and the properties which determine their suitability for specific applications. A detailed discussion of the injection moulding of reinforced thermoplastics includes the effect of processing on fibre distribution and breakage. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
