Bøger af Roger T. Fenner

This book is intended as a textbook providing a deliberately simple introduction to finite element methods in a way that should be readily understandable to engineers, both students and practising professionals. Only the very simplest elements are considered, mainly two dimensional three-noded "constant strain triangles", with simple linear variation of the relevant variables. Chapters of the book deal with structural problems (beams), classification of a broad range of engineering into harmonic and biharmonic types, finite element analysis of harmonic problems, and finite element analysis of biharmonic problems (plane stress and plane strain). Full FORTRAN programs are listed and explained in detail, and a range of practical problems solved in the text. Despite being somewhat unfashionable for general programming purposes, the FORTRAN language remains very widely used in engineering. The programs listed, which were originally developed for use on mainframe computers, have been thoroughly updated for use on desktops and laptops. Unlike the first edition, the new edition has problems (with solutions) at the end of each chapter.

Contents - Preface - Notation - 1 Introduction - 1.1 Polymeric Materials - 1.2 Polymer Processing - 1.3 Analysis of Polymer Processes - 1.4 Scope of the Book - 2 Introduction to the Main Polymer Processes - 2.1 Screw Extrusion - 2.2 Injection Moulding - 2.3 Blow Moulding - 2.4 Calendering - 2.5 Other Processes - 2.6 Effects of Processing - 3 Processing Properties of Polymers - 3.1 Melting and Thermal Properties of Polymers - 3.2 Viscous Properties of Polymer Melts - 3.3 Methods of Measuring Melt Viscosities - 3.4 Elastic Properties of Polymer Melts - 3.5 Temperature and Pressure Dependence of Melt Properties - 3.6 Processing Properties of Solid Polymers - 4 Fundamentals of Polymer Melt Flow - 4.1 Tensor Notation - 4.2 Continuum Mechanics Equations - 4.3 Constitutive Equations - 4.4 Boundary Conditions - 4.5 Dimensional Analysis of Melt Flows - 4.6 The Lubrication Approximation - 4.7 Mixing in Melt Flows - 5 Some Melt Flow Processes - 5.1 Some Simple Extrusion Dies - 5.2 Narrow Channel Flows in Dies and Crossheads - 5.3 Applications to Die Design - 5.4 Calendering - 5.5 Melt Flow in an Intensely Sheared Thin Film - 6 Screw Extrusion - 6.1 Melt Flow in Screw Extruders - 6.2 Solids Conveying in Extruders - 6.3 Melting in Extruders - 6.4 Power Consumption in Extruders - 6.5 Mixing in Extruders - 6.6 Surging in Extruders - 6.7 Over-all Performance and Design of Extruders - 7 Injection Moulding - 7.1 Reciprocating Screw Plastication - 7.2 Melt Flow in Injection Nozzles - 7.3 Flow and Heat Transfer in Moulds - Appendix A Finite Element Analysis of Narrow Channel Flow - Appendix B Solution of the Screw Channel Developing Melt Flow Equations - Appendix C Solution of the Melting Model Equations - Further Reading - Index -