Mechanics of Aircraft Structures

MECHANICS OF AIRCRAFT STRUCTURES Explore the most up-to-date overview of the foundations of aircraft structures combined with a review of new aircraft materials The newly revised Third Edition of Mechanics of Aircraft Structures delivers a combination of the fundamentals of aircraft structure with an overview of new materials in the industry and a collection of rigorous analysis tools into a single one-stop resource. Perfect for a one-semester introductory course in structural mechanics and aerospace engineering, the distinguished authors have created a textbook that is also ideal for mechanical or aerospace engineers who wish to stay updated on recent advances in the industry. The new edition contains new problems and worked examples in each chapter and improves student accessibility. A new chapter on aircraft loads and new material on elasticity and structural idealization form part of the expanded content in the book. Python code is included on the companion website that readers can use to solve design optimization problems. Readers will also benefit from the inclusion of: A thorough introduction to the characteristics of aircraft structures and materials, including the different types of aircraft structures and their basic structural elements An exploration of load on aircraft structures, including loads on wing, fuselage, landing gear, and stabilizer structures An examination of the concept of elasticity, including the concepts of displacement, strain, and stress, and the equations of equilibrium in a nonuniform stress field A treatment of the concept of torsion Perfect for senior undergraduate and graduate students in aerospace engineering, Mechanics of Aircraft Structures will also earn a place in the libraries of aerospace engineers seeking a one-stop reference to solidify their understanding of the fundamentals of aircraft structures and discover an overview of new materials in the field. Title Page Copyright Page Dedication Page Preface to the Third Edition Preface to the Second Edition Preface to the First Edition About the Companion Website 1 Characteristics of Aircraft Structures and Materials 1.1 INTRODUCTION 1.2 TYPES OF AIRCRAFT STRUCTURES 1.3 BASIC STRUCTURAL ELEMENTS IN AIRCRAFT STRUCTURE 1.4 AIRCRAFT MATERIALS PROBLEMS 2 Loads on Aircraft Structures 2.1 INTRODUCTION 2.2 BASIC STRUCTURAL ELEMENTS 2.3 Wing and Fuselage PROBLEMS 3 Introduction to Elasticity 3.1 INTRODUCTION 3.2 CONCEPT OF DISPLACEMENT 3.3 STRAIN 3.4 STRESS 3.5 EQUATIONS OF EQUILIBRIUM IN A UNIFORM STRESS FIELD 3.6 EQUATIONS OF EQUILIBRIUM IN A NONUNIFORM STRESS FIELD 3.7 STRESS VECTOR AND STRESS COMPONENTS RELATIONS 3.8 PRINCIPAL STRESS 3.9 SHEAR STRESS 3.10 STRESS TRANSFORMATION 3.11 LINEAR STRESS–STRAIN RELATIONS 3.12 PLANE ELASTICITY 3.13 FORMULATIONS BEYOND 2‐D PLANE ELASTICITY PROBLEMS REFERENCES 4 Torsion 4.1 INTRODUCTION 4.2 TORSION OF UNIFORM BARS WITH ARBITRARY CROSS‐SECTION 4.3 BARS WITH CIRCULAR CROSS‐SECTIONS 4.4 BARS WITH NARROW RECTANGULAR CROSS‐SECTIONS 4.5 CLOSED SINGLE‐CELL THIN‐WALLED SECTIONS 4.6 MULTICELL THIN‐WALLED SECTIONS 4.7 WARPING IN OPEN THIN‐WALLED SECTIONS 4.8 WARPING IN CLOSED THIN‐WALLED SECTIONS 4.9 EFFECT OF END CONSTRAINTS PROBLEMS REFERENCES 5 Bending and Flexural Shear 5.1 INTRODUCTION 5.2 BERNOULLI–EULER BEAM THEORY 5.3 STRUCTURAL IDEALIZATION 5.4 TRANSVERSE SHEAR STRESS DUE TO TRANSVERSE FORCE IN SYMMETRIC SECTIONS 5.5 TIMOSHENKO BEAM THEORY 5.6 SAINT‐VENANT'S PRINCIPLE 5.7 SHEAR LAG PROBLEMS REFERENCE 6 Flexural Shear Flow in Thin‐Walled Sections 6.1 INTRODUCTION 6.2 FLEXURAL SHEAR FLOW IN OPEN THIN‐WALLED SECTIONS 6.3 SHEAR CENTER IN OPEN SECTIONS 6.4 CLOSED THIN‐WALLED SECTIONS AND COMBINED FLEXURAL AND TORSIONAL SHEAR FLOW 6.5 CLOSED MULTICELL SECTIONS PROBLEMS 7 Failure Criteria for Isotropic Materials 7.1 INTRODUCTION 7.2 STRENGTH CRITERIA FOR BRITTLE MATERIALS 7.3 YIELD CRITERIA FOR DUCTILE MATERIALS 7.4 FRACTURE MECHANICS 7.5 STRESS INTENSITY FACTOR 7.6 EFFECT OF CRACK TIP PLASTICITY 7.7 FATIGUE FAILURE 7.8 FATIGUE CRACK GROWTH PROBLEMS REFERENCES 8 Elastic Buckling 8.1 INTRODUCTION 8.2 ECCENTRICALLY LOADED BEAM‐COLUMN 8.3 ELASTIC BUCKLING OF STRAIGHT BARS 8.4 INITIAL IMPERFECTION 8.5 POSTBUCKLING BEHAVIOR 8.6 BAR OF UNSYMMETRIC SECTION 8.7 TORSIONAL–FLEXURAL BUCKLING OF THIN‐WALLED BARS 8.8 ELASTIC BUCKLING OF FLAT PLATES 8.9 LOCAL BUCKLING OF OPEN SECTIONS PROBLEMS 9 Analysis of Composite Laminates 9.1 PLANE STRESS EQUATIONS FOR COMPOSITE LAMINA 9.2 OFF‐AXIS LOADING 9.3 NOTATION FOR STACKING SEQUENCE IN LAMINATES 9.4 SYMMETRIC LAMINATE UNDER IN‐PLANE LOADING 9.5 EFFECTIVE MODULI FOR SYMMETRIC LAMINATES 9.6 LAMINAR STRESSES 9.7 [±45°] LAMINATE PROBLEMS Index End User License Agreement