ESDU Composites Series
These Sections provide a rapidly growing collection of data for use in the design of fibre-reinforced laminated composite materials. The information is provided primarily for use in aerospace, but has wide application to other areas of engineering where composite materials offer benefits.
The Sections contain the solutions to many strength analysis problems met in the design of fibre-reinforced laminated composite structures. These include failure criteria, plate vibration and buckling, analysis of bonded joints, and stress concentrations, in addition to the calculation of basic stiffnesses and stresses including built-in thermal stresses.
Laminated composites can be specified in very many forms and assembled in a multitude of lay-up arrangements. Because of this complexity the only practical form in which many of the solutions can be provided is as a computer program, and Fortran programs are provided for many of the analysis methods. In addition to the freedom to change the overall geometry the designer in composites has the freedom to arrange the material strength and/or stiffness to meet the local loading. This complicates the design process and it is often difficult to select a route to the best combination of geometry and material. The Sections contain guidance on the factors influencing the design and suggest methods of achieving the desired solution.
Section 1: Organisational Documents
Section 2: Laminated Composites
Laminate stacking sequences for special orthotropy. (Application to fibre reinforced composites).
Estimation of the stiffnesses and apparent elastic properties of laminated flat plates.
Elastic stress and strain distributions around circular holes in infinite plates of orthotropic material (applicable to fibre reinforced composites).
Example of the use of Data Item No. 85001. Choice of reinforcement for a circular hole in a fibre reinforced laminated plate. (Data relating to one particular set of laminate properties.)
Transverse (through-the-thickness) shear stiffnesses of fibre reinforced composite laminated plates.
Stiffnesses of laminated flat plates.
Stress analysis of laminated flat plates.
Design of laminated plates subjected to in-plane loads and bending moments.
Thickness selection for the flanges and web of a composite I-section beam subjected to bending and shear.
- ESDU 82013
Section 3: Buckling of Balanced Laminated Composites
Stiffness of loaded flat strips under sinusoidally distributed bending couples at their edges (for use in local buckling calculations). (Uniaxial or biaxial loading. Isotropic or orthotropic materials.)
Estimation of the local buckling stress under biaxial compression of an isotropic skin with fibre reinforced integral unflanged stiffeners.
Buckling of rectangular specially orthotropic plates.
Buckling of flat rectangular plates (isotropic, orthotropic and laminated composite plates and sandwich panels).
Buckling of flat rectangular orthotropic plates.
Elastic buckling of cylindrically curved laminated fibre reinforced composite panels with all edges simply-supported under biaxial loading.
Elastic buckling of long, flat, symmetrically-laminated (AsBoDf), composite stiffened panels and struts in compression.
- ESDU 73007
Section 4: Buckling of Unbalanced Laminated Plates
Elastic buckling of unbalanced laminated fibre reinforced composite plates. (Rectangular plates of AsBtDs type, all edges simply-supported under biaxial loading.)
- ESDU 94006
Section 5: Sandwich Panels with Composite Face Plates
Elastic wrinkling of sandwich columns and beams with unbalanced laminated fibre reinforced face plates (face plates of AsBoDs, AsBlDs and AsBsDs types).
Elastic wrinkling of sandwich panels with laminated fibre reinforced face plates (face plates of AsBoDs, AsBlDs and AsBsDs types).
- ESDU 87013
Section 6: Composite Plates under Pressure
Flat rectangular orthotropic plates under uniformly distributed normal pressure. Elastic stresses and deflections for various forms of edge restraint.
- ESDU 93011
Section 7: Failure Criteria
Failure modes of fibre reinforced laminates.
Failure criteria for an individual layer of a fibre reinforced composite laminate under in-plane loading.
Failure analysis of fibre reinforced composite laminates.
Delamination of tapered composites.
Through-the-thickness stresses and failure in the corner radius of a laminated composite section.
Delamination and free edge stresses in composite laminates subjected to uniform prescribed axial strain and temperature change.
- ESDU 82025
Section 8: Bonded Joints
Shear stresses in the adhesives in bonded joints. Single step double lap joints loaded in tension.
Inelastic shear stresses and strains in the adhesives bonding lap joints loaded in tension or shear.
Elastic stresses in the adhesive in single step double lap bonded joints.
Elastic adhesive stresses in multistep lap joints loaded in tension.
Guide to the use of Data Items in the design of bonded joints
- ESDU 78042
Section 9: Damping and Response to Acoustic Loading
Estimation of damping in laminated and fibre-reinforced plates.
Estimation of r.m.s. strain in laminated skin panels subjected to random acoustic loading.
Endurance of fibre-reinforced composite, laminated structural elements subjected to simulated random acoustic loading.
Estimation of rms strain in laminated face plates of simply-supported sandwich panels subjected to random acoustic loading. Including a simplified natural frequency prediction method.
- ESDU 85012
Section 10: Natural Modes of Vibration
Natural frequencies of rectangular, specially orthotropic laminated plates.
Natural frequencies of simply-supported sandwich panels with laminated face plates.
Natural frequencies of singly-curved laminated plates with simply-supported edges.
Natural frequencies of isotropic and orthotropic rectangular plates under static in-plane loading (including shear loading).
ESDU TM 71
ESDU TECHNICAL MEMORANDUM A Rayleigh-Ritz method of analysis for vibration of orthotropic plates under static in-plane loading (including shear)
- ESDU 83036
- Aircraft Noise
- Fatigue - Endurance Data
- Fatigue - Fracture Mechanics
- Fluid Mechanics, Internal Flow
- Fluid Mechanics, Internal Flow (Aerospace)
- Heat Transfer
- Physical Data, Chemical Engineering
- Stress and Strength
- Transonic Aerodynamics
- Vibration and Acoustic Fatigue
- Wind Engineering