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2013 | Buch

Introduction Kapitel lesen Erstes Kapitel lesen

Drilling of Polymer-Matrix Composites

verfasst von: Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim

Verlag: Springer Berlin Heidelberg

Buchreihe : SpringerBriefs in Applied Sciences and Technology

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

This brief focus on drilling of polymer matrix composites for aerospace and defence applications. It gives an introduction to machining of polymer composites and discusses drilling as a processing of composites.

Inhaltsverzeichnis

Frontmatter

Part I

Frontmatter
Chapter 1. Introduction
Abstract
The technologically advancing society is continuously challenging the limits of conventional materials and placing newer demands on material performance. Extreme and sometimes conflicting requirements are forcing us to engineer materials that are not possible by conventional alloying methods. Composite materials form a material system composed of a mixture or combination and are insoluble in each other. Composite material comes under one class of engineered material developed specifically to meet such a challenge. Glass fibre reinforced resin matrix composites were first introduced in the early 1940s. Since then, the use of composites is growing steadily in various industries such as aircraft, marine, automobile, sporting goods, etc.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim
Chapter 2. Drilling of Composites
Abstract
The cutting process consists of removing a layer of material from blank to obtain a component of the required shape and dimensions and with specified quality of surface finish. During the process of material removal there is a relative motion between the workpiece and cutting tool. Such a relative motion is produced by a combination of rotary and translatory movement either of the work pieces or of cutting tool or both. The relative motion depends on the type of cutting operation. The cutting operation carried out on any machine tool is based on the theory, which is the same for all processes. The importance of the cutting process may be further appreciated by the observation that nearly every device in use in our complex society has one or more machined surfaces or holes.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim

Part II

Frontmatter
Chapter 3. Effects of Drill Points While Drilling of Composites
Abstract
The mechanism of the material removal in an oblique cutting process such as drilling, the variation of the forces with time and their influence on accompanying damage, the optimal drill point geometry for minimizing the drilling forces and the subsequent damage are some of the directions in which the work in the machining of composite material is progressing. Four facet, eight-facet, Jo-point, inverted cone and special geometry are some of the widely used tool designs in drilling composite materials.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim

Part III

Frontmatter
Chapter 4. Effects of Drill Points While Drilling at High Spindle Speed
Abstract
High speed machining is now recognized as one of the key manufacturing technologies for higher productivity and throughput. It is well known that the most effective way of achieving good quality holes while drilling fibre reinforced plastics is by reducing the thrust and torque.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim
Chapter 5. Numerical Prediction of the Critical Thrust Force Causing Delamination at the Hole Exit
Abstract
Delamination at the exit of the hole is considered the most costly damage in the composite structure. This defect leads to a significant loss of the tensile strength and the stiffness of the composite part when it is loaded in compression, shear or fatigue loading.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim
Chapter 6. Effects of Drilling Parameters on Mechanical Strength
Abstract
The damage generated during the drilling of Fibre Reinforced Plastics (FRP) is detrimental to the mechanical behavior of the composite structure. Degree of damage depends on the feed, spindle speed, tool material and nature of cutting edge etc. This work is focused on analyzing the influence of drilling parameters (spindle speed and feed) on the strength of the glass fibre reinforced woven fabric laminates and further to study the residual stress distribution around the hole after drilling. Holes were drilled at the center of the specimens in a CNC machining center using 6 mm diameter micro grain carbide drill for various spindle speeds (1,000–4,000 rpm) and feed rates (0.02, 0.06, 0.10, and 0.20 mm/rev).
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim
Chapter 7. Behavior of Composite Laminates with Drilled and Moulded Hole Under Tensile Load
Abstract
Nowadays, composite materials are used within primary load carrying aircraft structures. Recent examples are Boeing 787 and Airbus A350XWB where the composite weight content has increased to 50–60 %. However, joining of a composite part on a structure often requires manufacturing holes in order to place bolts or rivets. To obtain these holes, different processes can be implemented such as drilling or moulding. Drilling process concerns a conventional machining procedure where the composite materials are machined to produce hole. Nonetheless, it implies destruction of fibre continuity, large stress concentration and delamination at the hole entry and the hole exit. Such result of damages can cause significant reduction in both tensile and compressive strength of composite structure.
Vijayan Krishnaraj, Redouane Zitoune, J. Paulo Davim
Metadaten
Titel
Drilling of Polymer-Matrix Composites
verfasst von
Vijayan Krishnaraj
Redouane Zitoune
J. Paulo Davim
Copyright-Jahr
2013
Verlag
Springer Berlin Heidelberg
Electronic ISBN
978-3-642-38345-8
Print ISBN
978-3-642-38344-1
DOI
https://doi.org/10.1007/978-3-642-38345-8

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