Mechanics of Aircraft Structures

ISBN-13: 9781119583912 / Angielski / Twarda / 2021 / 320 str.

Ashaq Adnan

Spis treści

CONTENTSPreface xiiiPreface to the First Edition xv1 Characteristics of Aircraft Structures and Materials 11.1 Introduction / 11.2 Types of Aircraft Structures / 11.2.1 Fixed-wing Aircraft / 11.2.2 Rotorcraft / 21.2.3 Lighter-than-air Vehicles / 21.2.4 Drones / 21.3 Basic Structural Elements in Aircraft Structure / 31.3.1 Fuselage / 31.3.2 Wing / 31.3.3 Landing Gear / 31.3.4 Control Surfaces / 41.4 Aircraft Materials / 4Problems / 62 Loads on Aircraft Structures 72.1 Introduction / 72.2 Basic Structural Elements / 72.2.1 Axial Member / 72.2.2 Shear Panel / 82.2.3 Bending Member (Beam) / 92.2.4 Torsion Member / 102.3 Wing and Fuselage / 112.3.1 Load Transfer / 112.3.2 Wing Structure / 122.3.3 Fuselage / 13Problems / 153 Introduction to Elasticity 183.1 Introduction / 183.2 Concept of Displacement / 193.3 Strain / 213.4 Stress / 263.5 Equations of Equilibrium in a Uniform Stress Field / 283.6 Equations of Equilibrium in a Nonuniform Stress Field / 303.7 Stress Vector-Stress Component Relations / 323.8 Principal Stress / 343.9 Shear Stress / 373.10 Stress Transformation / 393.11 Linear Stress-Strain Relations / 413.11.1 Strains Induced by Normal Stress / 423.11.2 Strains Induced by Shear Stress / 453.11.3 Three-Dimensional Stress-Strain Relations / 463.12 Plane Elasticity / 513.12.1 Stress-Strain Relations for Plane Isotropic Solids / 513.12.2 Stress-Strain Relations for Orthotropic Solids in Plane Stress / 543.12.3 Governing Equations / 553.12.4 Solution by Airy Stress Function for Plane Isotropic Solids / 583.12.5 Plane Elasticity Solutions in Polar Coordinate System / 603.13 Formulations Beyond 2D Plane Elasticity / 64Problems / 664 Torsion 744.1 Introduction / 744.2 Torsion of Uniform Bars with Arbitrary Cross-section/ 754.2.1 Governing Equations / 754.2.2 Boundary Conditions / 784.3.3 Torque-Stress Relations / 794.3.4 Warping Displacement / 804.3.5 Torsion Constant / 804.3 Bars with Circular Cross-Sections / 814.3.1 Elasticity Approach using Prandtl Stress Function / 814.3.2 Mechanics of Solid Approach / 844.4 Bars with Narrow Rectangular Cross-Sections / 874.5 Closed Single-Cell Thin-Walled Sections / 914.5.1 The s-n coordinate system / 914.5.2 Prandtl Stress Function / 934.5.3 Shear Flow q / 944.5.4 Shear Flow - Torque Relation / 954.5.5 Twist Angle / 964.5.6 Torsion Constant J / 994.6 Multicell Thin-Walled Sections / 1024.7 Warping in Open Thin-Walled Sections / 1074.8 Warping in Closed Thin-Walled Sections / 1114.9 Effect of End Constraints / 113Problems / 1205 Bending and Flexural Shear 1265.1 Introduction / 1265.2 Bernoulli-Euler Beam Theory / 1265.2.1 Unidirectional Bending on Beams witha Symmetric Section / 1265.2.2 Bidirectional Bending on Beams withan Arbitrary Section / 1325.3 Structural idealization / 1375.4 Transverse Shear Stress due to Transverse Force inSymmetric Sections / 1465.4.1 Narrow Rectangular Cross-Section / 1475.4.2 General Symmetric Sections / 1485.4.3 Thin-Walled Sections / 1505.34.4 Shear Deformation in Thin-Walled Sections / 1515.5 Timoshenko Beam Theory / 1545.6 Saing-Venant's Principle / 1585.7 Shear Lag / 162Problems / 1656 Flexural Shear Flow in Thin-Walled Sections 1716.1 Introduction / 1716.2 Flexural Shear Flow in Open Thin-Walled Sections / 1716.2.1 Symmetric Thin-Walled Sections / 1726.2.2 Unsymmetric Thin-Walled Sections / 1766.2.3 Multiple Shear Flow Junctions / 1786.2.4 Selection of Shear Flow Contour / 1796.3 Shear Center in Open Sections / 1806.4 Closed Thin-Walled Sections and Combined Flexural andTorsional Shear Flow / 1866.4.1 Shear Center / 1876.4.2 Statically Determinate Shear Flow / 1916.5 Closed Multicell Sections / 194Problems / 1987 Failure Criteria for Isotropic Materials 2057.1 Introduction / 2057.2 Strength Criteria for Brittle Materials / 2057.2.1 Maximum Principal Stress Criterion / 2057.2.2 Coulomb-Mohr Criterion / 2067.3 Yield Criteria for Ductile Materials / 2087.3.1 Maximum Shear Stress Criterion (Tresca YieldCriterion) in Plane Stress / 2087.3.2 Maximum Distortion Energy Criterion (von MisesYield Criterion) / 2107.4 Fracture Mechanics / 2157.4.1 Stress Concentration / 2157.4.2 Concept of Cracks and Strain Energy Release Rate / 2167.4.3 Fracture Criterion / 2187.5 Stress Intensity Factor / 2237.5.1 Symmetric Loading (Mode I Fracture) / 2237.5.2 Antisymmetric Loading (Mode II Fracture) / 2257.5.3 Relation between K and G / 2277.5.4 Mixed Mode Fracture / 2317.6 Effect of Crack Tip Plasticity / 2327.7 Fatigue Failure / 2357.7.1 Constant Stress Amplitude / 2357.7.2 S-N Curves / 2357.7.3 Variable Amplitude Loading / 2367.8 Fatigue Crack Growth / 236Problems / 2398 Elastic Buckling 2448.1 Introduction8.2 Eccentrically Loaded Beam-Column / 2448.3 Elastic Buckling of Straight Bars / 2458.3.1 Pinned-Pinned Bar / 2478.3.2 Clamped-Free Bar / 2508.3.3 Clamped-Pinned Bar / 2518.3.4 Clamped-Clamped Bar / 2528.3.5 Effective Length of Buckling / 2538.4 Initial Imperfection / 2548.5 Postbuckling Behavior / 2568.6 Bar of Unsymmetric Section / 2628.7 Torsional-Flexural Buckling of Thin-Walled Bars / 2658.7.1 Nonuniform Torsion / 2658.7.2 Torsional Buckling of Doubly Symmetric Section / 2678.7.3 Torsional-Flexural Buckling / 2698.8 Elastic Buckling of Flat Plates / 2758.8.1 Governing Equation for Flat Plates / 2738.8.2 Cylindrical Bending / 2758.8.3 Buckling of Rectangular Plates / 2768.8.4 Buckling under Shearing Stresses / 2798.9 Local Buckling of Open Sections / 280Problems / 2829 Analysis of Composite Laminates 2879.1 Plane Stress Equations for Composite Lamina / 2879.2 Off-Axis Loading / 2939.3 Notation for Stacking Sequence in Laminates / 2959.4 Symmetric Laminate under In-Plane Loading / 2969.5 Effective Moduli for Symmetric Laminates / 2999.6 Laminar Stresses / 3039.7 [±45°] Laminate / 305Problems / 306Index 308

O autorze

C. T. Sun, PhD, is Neil A. Armstrong Distinguished Professor Emeritus of Aeronautics and Astronautics at Purdue University. Dr. Sun was the inaugural recipient of the AIAA-ASC James H. Starnes Award and the 2007 ASME Warner T. Koiter Medal.Ashfaq Adnan, PhD, is Professor in the Mechanical and Aerospace Engineering Department at the University of Texas at Arlington and a Fellow of ASME. His research focus is on deformation, damage, and failure of biological, bioinspired, and engineered materials at multiple length scales.