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Author: H. Kang Publisher: ISBN: Category : Fatigue Languages : en Pages : 6
Book Description
Lightweight thermoplastic-based fiber-metal laminates were developed based on a self-reinforced polypropylene and a glass fiber-reinforced polypropylene composite material with two sheets of aluminum alloy 2024-T3. The laminates were manufactured using a fast one step cold press manufacturing procedure. The mechanical behavior of the laminates was then investigated under tensile and fatigue loading conditions. The tensile properties of the plain aluminum, the composite materials, and the thermoplastic fiber-metal laminates (TFML) were investigated at quasi-static rates of loading. The fatigue tests were also conducted under load control based on the ASTM E 466 standard procedure. Various loading cycles were employed for the fatigue tests in order to minimize the possibility of heat generation on the composite materials. Three different load levels were applied for the fatigue specimens with zero to max loading. Results have shown that the glass fiber-reinforced polypropylene hybrid systems exhibited higher fatigue strength than the self-reinforced polypropylene based fiber-metal laminates. Following this, a simple prediction method for fatigue life of the TFMLs has been introduced. It is clearly indicated that the stress ranges calculated using the proposed method for the monolithic AL2024-T3 and the TFMLs are very similar at the same cycles to failure.
Author: H. Kang Publisher: ISBN: Category : Fatigue Languages : en Pages : 6
Book Description
Lightweight thermoplastic-based fiber-metal laminates were developed based on a self-reinforced polypropylene and a glass fiber-reinforced polypropylene composite material with two sheets of aluminum alloy 2024-T3. The laminates were manufactured using a fast one step cold press manufacturing procedure. The mechanical behavior of the laminates was then investigated under tensile and fatigue loading conditions. The tensile properties of the plain aluminum, the composite materials, and the thermoplastic fiber-metal laminates (TFML) were investigated at quasi-static rates of loading. The fatigue tests were also conducted under load control based on the ASTM E 466 standard procedure. Various loading cycles were employed for the fatigue tests in order to minimize the possibility of heat generation on the composite materials. Three different load levels were applied for the fatigue specimens with zero to max loading. Results have shown that the glass fiber-reinforced polypropylene hybrid systems exhibited higher fatigue strength than the self-reinforced polypropylene based fiber-metal laminates. Following this, a simple prediction method for fatigue life of the TFMLs has been introduced. It is clearly indicated that the stress ranges calculated using the proposed method for the monolithic AL2024-T3 and the TFMLs are very similar at the same cycles to failure.
Author: René Alderliesten Publisher: Springer ISBN: 3319562274 Category : Technology & Engineering Languages : en Pages : 310
Book Description
This book contributes to the field of hybrid technology, describing the current state of knowledge concerning the hybrid material concept of laminated metallic and composite sheets for primary aeronautical structural applications. It is the only book to date on fatigue and fracture of fibre metal laminates (FMLs). The first section of the book provides a general background of the FML technology, highlighting the major FML types developed and studied over the past decades in conjunction with an overview of industrial developments based on filed patents. In turn, the second section discusses the mechanical response to quasi-static loading, together with the fracture phenomena during quasi-static and cyclic loading. To consider the durability aspects related to strength justification and certification of primary aircraft structures, the third section discusses thermal aspects related to FMLs and their mechanical response to various environmental and acoustic conditions.
Author: Publisher: ISBN: Category : Languages : en Pages : 223
Book Description
Equations for predicting the theoretical stresses and mechanical properties of fiber/metal laminates were derived. These were applied to a model high temperature laminate system based on 8OO9 aluminum and glass fiber reinforced U-25 thermoplastic polyimide. The effects of aluminum surface treatment on bond strength were investigated; chemical surface treatments gave superior bond strength compared to mechanical treatments. Adequate bond strength was obtained using simplified and environmentally safe surface preparation techniques. The tensile yield and ultimate strength, elastic modulus, fracture behavior, dynamic mechanical behavior, chemical resistance, and fatigue resistance of the laminate were investigated. Most properties were found to correlate well with the theoretical predictions. The laminate showed excellent strength retention at temperatures above 200 deg C. Fatigue resistance as- processed was found to be comparable to monolithic 8009. Post-stretching the laminate was shown to increase both fatigue life and yield strength substantially.
Author: Anthony Sexton Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Fibre--metal laminates are sandwich materials comprised of altering layers of fibre-reinforced composites and metal alloys. These materials can offer superior properties compared to the monolithic constituents such as superior specific strength compared to metals and better impact and fatigue resistance than composite materials. The use of fibre--metal laminates is currently restricted to specialised applications where the superior properties justify the high cost. This is due to the increased manufacturing time and cost over conventional materials. A method for mass production of fibre--metal laminates would allow them to be integrated more easily into existing production facilities and greatly reduce the cost associated with their use. This thesis investigates the stamp formability of fibre--metal laminates using two distinct materials; one laminate based on a self-reinforced polypropylene composite and the other based on a glass-fibre reinforced polypropylene composite. Specimens of varying geometry were stretched over a hemispherical punch to elicit different deformation modes in the fibre--metal laminates and a non-contact optical measurement system was used to measure the surface strain during deformation. These experiments analysed the effect of the deformation mode on the formability of the laminates. The results from the experimentation were used to assess the deformation behaviour of the fibre--metal laminates and to identify the safe forming limits of the materials. It was found that the fibre--metal laminates can be formed in a similar manner to monolithic metals. The self-reinforced polypropylene laminate was found to exhibit superior formability to monolithic aluminium whereas the glass-fibre reinforced polypropylene laminate showed reduced formability. In addition, the effect of temperature on the formability of the laminates was investigated. The temperature did not have a significant effect on the deformation behaviour during the forming process in either fibre--metal laminate and no increased formability was exhibited by the glass-fibre reinforced polypropylene based laminate. However, the self-reinforced polypropylene based laminate showed improved formability at elevated temperatures. Two significant findings were identified; the friction interaction between the specimens and the tooling has a major effect on the forming of the laminates, and the forming limits of the aluminium are improved when bonded to self-reinforced polypropylene composite. The finite element analysis software ABAQUS/Standard was chosen for simulation of fibre--metal laminate forming. Tensile tests were performed to obtain the mechanical behaviour of the constituent materials, where the composites were simulated using non-linear elastic orthotropic material models and the aluminium using an elastic-plastic model. The experimental forming results were compared to the simulation and it was found that the simulation could accurately represent the general forming behaviour of the laminates. There was difficulty in matching some of the glass-fibre reinforced polypropylene laminates due the non-homogeneous behaviour of the composite. Results from the simulated specimens were used to assess the deformation of the composite, which could not be directly observed in the experiments, and to determination a preliminary failure condition of the composite experiencing stretch forming using the predicted strain in the failure region.
Author: Ad Vlot Publisher: Springer Science & Business Media ISBN: 030648398X Category : Technology & Engineering Languages : en Pages : 224
Book Description
Glare is the name given to a new material for aircraft structures developed at Delft University in the Netherlands. It consists of thin aluminium layers bonded together by adhesive containing embedded fibres and is very resistant to fatigue. This book gives the inside story of how the development of Glare took place. It took more than two decades from the first tests in Delft to the major breakthrough following the decision of Airbus to apply the material on the A380 super-jumbo. This success was achieved by a small group of people inspired by professor Boud Vogelesang, people who kept believing in the material and fought against all obstacles during the years. This book tells the story of the ups and downs and the final success of their efforts.
Author: H. Kang
Author: H. Kang
Author: René Alderliesten
Author: Ad Vlot
Author: 
Author: Y. Toi
Author: R. Fredell
Author: Anthony Sexton
Author: Per Hofslagare
Author: Ad Vlot
Author: Saṅgītā Guptā (Ḍô)