Bibliothèque de L'IMIST/CNRST

Sheet forming is the most common process used in metal forming and is therefore constantly being adapted or modified to suit the needs of forming composite sheets. Due to the increasing availability of various types of fibre reinforced polymeric sheets, especially with thermoplastic matrices, the scope of use of such materials is rapidly expanding in the automobile, building, sports and other manufacturing industries beyond the traditional areas of aerospace and aircraft applications. This book contains twelve chapters and attempts to cover different aspects of sheet forming including both thermoplastic and thermosetting materials. In view of the expanded role of fibre reinforced composite sheets in the industry, the book also describes some non-traditional applications, processes and analytical techniques involving such materials. The first chapter is a brief introduction to the principles of sheet metal forming. The next two chapters introduce the various forms of materials, manufacturing techniques and the fundamentals of computer simulation. Chapter 4 describes the different aspects of thermoforming of continuous fibre reinforced thermoplastics and the following chapter studies the shear and frictional behaviour of composite sheets during forming. Chapter 6 explores the possibility of applying the grid strain analysis method in continuous fibre reinforced polymeric sheets. The next two chapters address fundamental concepts and recent developments in finite element modelling and rheology. Chapter 9 introduces the theory of bending of thermoplastic composite sheets and shows a novel way of determining both longitudinal and transverse viscosities through vee-bend tests. A significant expansion in the usage of composite materials is taking place in biomedical areas. Chapter 10 discusses the thermoforming of knitted fabric reinforced thermoplastics for load bearing and anisotropic bio-implants. The final chapter introduces roll forming, a commonly used rapid manufacturing process for sheet metals, and discusses the possibility of applying it economically for continuous reinforced thermoplastic sheets.

Includes bibliographical references and index.

Description based on print version record.

Cover -- Contents -- Preface -- List of Contributors -- Chapter 1. Introduction to sheet metal forming -- Abstract -- 1.1. Introduction -- 1.2 Introduction to plastic flow theory -- 1.3. Forming characteristics of sheet metals -- 1.4. Forming limits for sheet metal -- 1.5. Industrial sheet metal forming -- 1.6. Bending and spring-back -- 1.7. Superplasticity -- References -- Chapter 2. Thermoplastic composite sheet forming: materials and manufacturing techniques -- Abstract -- 2.1. Introduction -- 2.2. Constituents -- 2.3. Properties -- 2.4. Manufacturing techniques -- Acknowledgement -- References -- Chapter 3. Computer simulation of thermoforming -- Abstract -- 3.1. Introduction -- 3.2. Sheet production -- 3.3. Thermoforming simulation -- 3.4. Concluding remarks -- References -- Chapter 4. Thermoforming of continuous fibre/thermoplastic composite sheets -- Abstract -- 4.1. Introduction -- 4.2. Experimental details and procedures -- 4.3. 2-D stamp forming -- 4.4. 3-D stamp forming -- 4.5. 3-D diaphragm forming of GF/PP laminates -- 4.6. Summary -- Acknowledgements -- References -- Chapter 5. Characterisation of shearing and frictional behaviour during sheet forming -- Abstract -- 5.1. Introduction -- 5.2. Transverse fibre flow -- 5.3. Intra-ply shear -- 5.4. Inter-ply slip -- 5.5. Friction during thermoforming -- References -- Chapter 6. Grid strain analysis and its application in composite sheet forming -- Abstract -- 6.1. Introduction -- 6.2. Large strain analysis -- 6.3. Method of least squares fitting -- 6.4. Forming a composite spherical dome -- 6.5. Forming a composite blister fairing -- 6.6. Draping theory of textile fabrics -- 6.7. Diagnostic applications -- 6.8. Concluding remarks -- References -- Chapter 7. Implicit finite element modelling of composites sheet forming processes -- Abstract -- 7.1. Introduction -- 7.2. Modelling of composite sheets during forming -- 7.3. Numerical solutions -- plane stress problems -- 7.4. Central indentation of a composite sheet -- the shear-buckling problem -- 7.5. Experimental comparisons -- diaphragm forming -- 7.6. Conclusions of plane stress analysis -- 7.7. Numerical solutions -- plane deformation problems -- 7.8. Conclusions of plane deformation analysis -- Acknowledgements -- Nomenclature -- References -- Chapter 8. Rheology of long fiber-reinforced composites in sheet forming -- Abstract -- 8.1. Introduction -- 8.2. Rheological properties -- 8.3. Rheological measurement techniques -- 8.4. Why the rheological properties are important and how to use them in sheet forming -- 8.5. Outlook -- References -- Chapter 9. Bending of continuous fibre-reinforced thermoplastic sheets -- Abstract -- 9.1. Introduction -- 9.2. Development of an idealised viscous bending model --T$10.