A Model for the Thermoplastic Analysis of Metal Matrix Laminates PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
This report describes the development of a theoretical model for the thermoplastic analysis of metal matrix fiber reinforced laminates. The nonlinear analysis is based on an incremental form of classical lamination theory in which the laminate can be loaded by residual stresses, thermal loads and edge stress resultants. The constituent stresses of the layers of the laminate are computed as the phase average stresses of the Composite Cylinder Assemblage. The matrix plasticity is treated by a transversely isotropic J2 theory with the exception that the response is found in an average sense since the onset of plastic flow (von Mises yield surface) and the flow itself (Prager's Rule) are based on the matrix phase average stresses. The hardening is temperature-dependent and kinematic. The mathematical model also accounts for the temperature dependency of the fiber and matrix material properties.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
This report describes the development of a theoretical model for the thermoplastic analysis of metal matrix fiber reinforced laminates. The nonlinear analysis is based on an incremental form of classical lamination theory in which the laminate can be loaded by residual stresses, thermal loads and edge stress resultants. The constituent stresses of the layers of the laminate are computed as the phase average stresses of the Composite Cylinder Assemblage. The matrix plasticity is treated by a transversely isotropic J2 theory with the exception that the response is found in an average sense since the onset of plastic flow (von Mises yield surface) and the flow itself (Prager's Rule) are based on the matrix phase average stresses. The hardening is temperature-dependent and kinematic. The mathematical model also accounts for the temperature dependency of the fiber and matrix material properties.
Author: Yehia Ahmed Bahei-El-Din
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 522
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Book Description
Author: George Staab
Publisher: Elsevier
ISBN: 0080523927
Category : Technology & Engineering
Languages : en
Pages : 327
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Book Description
This text provides students with the theoretical knowledge and practical skills necessary to identify, model, and solve structural analysis problems. The material is illustrated throughout with numerous diagrammatic examples, as well as example problems similar in nature to those found in lower level strength of materials texts. The difficulty of these and the homework problems varies from simple to complex. A solutions manual is provided for lecturers who adopt the book for classroom teaching.This book mirrors the teaching method used in strength of materials courses taught in the first years of an undergraduate degree and relate this higher level treatment back to that. The author is involved in the development of the latest teaching methods (with McGraw Hill), and his style is straightforward. There is web-mounted software to back up the book's content, plus a solutions manual for instructors. There are approximately 20-30 homework problems per chapter, making a substantial body of material for teaching use.Mirrors the teaching method used in strength of materials courses Straightforward and user-friendly writing style Web-mounted software and solutions manual for instructors
Author: David J. Barrett
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 128
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Book Description
Author: F. Mirzadeh
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 9
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Book Description
An analytical, inelastic micromechanical model, with temperature-dependent matrix properties, is employed to study metal matrix composite (MMC) laminates subjected to thermomechanical loading. The predictions are based on knowledge of the thermomechanical response of transversely isotropic, elastic graphite or silicon carbide fibers and elastic-viscoplastic, work-hardening, temperature-dependent titanium or aluminum matrix. The model is applied to predict initial yielding and thermomechanical response of silicon carbide/titanium and graphite/aluminum laminates. The results demonstrate the effect of cooling from a stress-free temperature and the mismatch of thermal and mechanical properties of the constituent phases on the laminate's subsequent mechanical response. Typical results are presented for [±45], laminates subjected to monotonic tension, cyclic tension/compression, biaxial tension, and thermal loadings. It is shown that inclusion of temperature-dependent properties has a significant influence on both the initial yield surface and the inelastic response of metal matrix composites. It is also shown that the degree of applied biaxial loading has a significant effect on the response of laminates.
Author: Ad Vlot
Publisher: Springer Science & Business Media
ISBN: 9781402000386
Category : Science
Languages : en
Pages : 556
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Book Description
Like New, No Highlights,No Markup,all pages are intact.
Author: P. G. Sheasby
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 632
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Book Description
Author: Anthony Sexton
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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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:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 384
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Book Description
Author: John R. Smith
Publisher:
ISBN:
Category : Laminated plastics
Languages : en
Pages : 124
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Book Description
Composite materials display excellent specific strength and stiffness, light-weighting benefits, and are effective replacements for metals which are typically heavy and susceptible to corrosion. Next generation transportation, military, infrastructure, and marine sectors are extensively using fiber reinforced composite materials for part replacement and structural applications. Producing these advanced composite structures can often result in extensive development time and material wastage. There is a need to understand composite laminate formability and implement predictive methodology during product design to minimize manufacturing costs. The overall objective of this research was to predict the formability of thick section, plain woven, thermoplastic matrix composite laminates by analyzing parts produced with the combined application of localized heat and pressure. This research dealt with (a) optimizing the manufacturing process for thermoformed laminates using a single, hemispherical cup and a design of experiment approach, (b) generating a global strain map of the formed laminate with continuum mechanics, and using this as a comparative tool to generate a predictive, analytical model built upon bilinearly blended Coons patches and cubic-splines, (c) constructing a finite element model capable of forming conditions to predict global temperature profiles of the laminate, and (d) developing a bi-component shear stress based mechanical relationship for an as-formed part which considered the predicted intraply shear from section (b) and the predicted temperature profile of section (c). Section (a) minimized the amount of cross-sectional variance within one millimeter and permitted the assumption of uniform thickness throughout the thermoforming process. The analytical model of section (b) produced results which were highly comparable to experimental trials. On average, there was a point to point difference of 2.5 millimeters with a standard deviation of 1.4 and a variation in intraply shear of 4.3 degrees with a standard deviation of 4. Thermal profiles of section (c) were determined from finite element analysis and able to match experimental tests for undeformed laminates within an average accuracy of 10°C. Section (d) summarized the predicted mechanical properties and produced a stress profile for a formed laminate.
