Iterative preliminary design tools for composite structures

1990 ◽  
Vol 16 (1-3) ◽  
pp. 103-123 ◽  
Author(s):  
Stephen R. Hall
Keyword(s):  
Composite Structures ◽  
Preliminary Design ◽  
Design Tools

Systematic Process Chain Creation for CFRP Structures in Early Product Development Stages

2016 ◽  
Vol 1140 ◽  
pp. 328-334
Author(s):  
Matthias Behr ◽  
Carsten Schmidt
Keyword(s):  
Composite Structures ◽  
Production Costs ◽  
Preliminary Design ◽  
Process Chain ◽  
Whole Process ◽  
Reinforced Plastic ◽  
Building Process ◽  
Process Chains ◽  
Carbon Fibre Reinforced Plastic ◽  
Specific Sequences

A planning method is presented which allows to systematically building process chains based on a preliminary design of composite structures. The method utilises the specific sequences of procedural steps that occur in the production of carbon fibre reinforced plastic (CFRP) structures, to build sub process chains for each component of the structure. Process restrictions are considered to evaluate the suitability of different production processes. To obtain the whole process chain of the structure, different joining methods are applied in addition to combine the components and its sub process chains. The results of the presented method are used in an overarching development procedure to investigate resulting impacts on the solution. Possible impacts could be the production costs or the material characteristics.

Impact on composite structures

2004 ◽  
Vol 108 (1089) ◽  
pp. 541-563 ◽  
Author(s):  
G. A. O. Davies ◽  
R. Olsson
Keyword(s):  
Composite Structures ◽  
Structural Damage ◽  
Impact Damage ◽  
Laminated Composite ◽  
Design Tools ◽  
Laminated Composite Structures ◽  
Consequent Reduction ◽  
The Subject ◽  
Research Initiatives ◽  
Damage Tolerant

The problem of impact damage in laminated composite structures, and the consequent reduction in residual strength, has been a topic of continual research for over two decades. The number of journal papers on the subject now runs into four figures and most have been conscientiously reviewed by Abrate(1991, 1994, 1998). This review is not intended to be in the academic tradition, with emphasis on acknowledging the authorship of all the various research initiatives. Instead we present our opinions so that the reader can appreciate our current understanding of the problem, our capability of predicting by analysis, and the scope of the design tools for avoiding structural damage, or at least designing damage tolerant aerospace structures.

An invariant-based performance-oriented procedure for preliminary design of composite structures

2018 ◽  
Vol 90 (3) ◽  
pp. 532-541 ◽  
Author(s):  
Francesco Danzi ◽  
Giacomo Frulla ◽  
Giulio Romeo
Keyword(s):  
Composite Structures ◽  
Material Selection ◽  
Geometrical Shape ◽  
Preliminary Design ◽  
Functional Requirements ◽  
Content Type ◽  
Scaling Procedure ◽  
Daunting Task ◽  
Design Activities ◽  
Effort Reduction

Purpose This paper aims to present a systematic performance-oriented procedure to predict structural responses of composite layered structures. The procedure has a direct application in the preliminary design of aerospace composite structures evaluating the right and most effective material. Design/methodology/approach The aforementioned procedure is based upon the definition of stiffness invariants. In the paper, the authors briefly recall the definition and the physical explanation of the invariants, i.e. the trace; then they present the scaling procedure for the selection of the best material for a fixed geometrical shape. Findings The authors report the basic principles of the scaling procedure and several examples pertaining typical responses sought in the preliminary design of aeronautic structures Research limitations/implications Typically, during early stages, engineers had to perform the daunting task of balancing among functional requirements and constraints and give the optimum solution in terms of structural concept and material selection. Moreover, preliminary design activities require evaluating different responses as a function of as less as possible parameters, ensuring medium to high fidelity. The importance of incorporating as much physics and understanding of the problem as early as possible in the preliminary design stages is therefore fundamental. A robust and systematic procedure is necessary. Practical implications The time/effort reduction in the preliminary design of composite structures can increase the overall quality of the configuration chosen. Social implications Reduction in design costs and time. Originality/value In spite of the well-known invariant properties of composites, the application and extension to the preliminary design of composite structures by means of a scaling rule is new and original.

Compromise: An Effective Approach for Designing Composite Conical Shell Structures

1990 ◽  
Vol 112 (3) ◽  
pp. 362-368 ◽  
Author(s):  
W. J. Fuchs ◽  
H. M. Karandikar ◽  
F. Mistree ◽  
H. A. Eschenauer
Keyword(s):  
Conical Shell ◽  
Composite Structures ◽  
Composite Laminate ◽  
Fiber Composite ◽  
Shell Structures ◽  
Preliminary Design ◽  
Fiber Reinforced ◽  
Membrane Theory ◽  
Minimal Weight ◽  
Made In

The layout of fiber composite structures compared to that of structures made from conventional homogeneous isotropic materials is far more difficult, because a fiber composite (laminate) is built up of several unidirectional layers (UD-layers) with fibers set at different angles. A contribution to the structural analysis and preliminary design of a fiber-reinforced conical shell is made in this paper. The equations of the membrane theory are used for analyzing the shell behavior. The design, with the objective of obtaining minimal deformation at minimal weight, subject to a set of failure constraints, is achieved by formulating and solving a compromise Decision Support Problem. Some designs of a fiber reinforced conical shell subjected to pressure load and temperature are presented.

Multilevel/Multiobjective Design of Composite Structures

2012 ◽  
Vol 525-526 ◽  
pp. 197-200
Author(s):  
Omar Bacarreza ◽  
M.H. Aliabadi ◽  
A. Apicella
Keyword(s):  
Mechanical Behavior ◽  
Composite Structures ◽  
Preliminary Design ◽  
Detailed Design ◽  
Design Variables ◽  
Multiobjective Design

A multilevel multiobjective platform for structural sizing reproducing the sequence of actions taken during design and structural sizing in industry is presented in this paper. This platform is integrated at two design levels labeled as Preliminary Design Level and Detailed Design Level. The set of design variables can be divided into a group of variables describing the main conceptual layout that affect the dimensions and architecture of the model and a second group of variables influencing the material and mechanical behavior. This kind of approach can be effective if it is possible to separate the constraints that are strongly dependent on the design variables of different design levels.

scholarly journals SURVEY-BASED ASSESSMENT OF DESIGN SKILL DEVELOPMENT IN ENGINEERING PROJECT COURSES

2011 ◽  
Author(s):  
Brian Frank ◽  
David Strong
Keyword(s):  
Assessment Tool ◽  
Problem Definition ◽  
First Year ◽  
Preliminary Design ◽  
Design Tools ◽  
Engineering Project ◽  
The Third ◽  
Future Improvement ◽  
Before And After ◽  
Design Experience

A pilot of a paper-based assessment tool of design skill is presented. The tool is used to assess the development of skills before and after a first year design experience, and before and after a third year multidisciplinary course in design tools and methodology. The tool is an open-ended survey that may be administered quickly and assessed using a simple rubric. Significant improvements were found over the term of the first year course in the areas of problem definition and testing; improvements were observed in the categories of Conceptual Design, Preliminary Design, and Detailed Design in the third year course. Ideas for future improvement are discussed.

Dynamic Non-Interference Constraints in Goal-Directed Geometry

1995 ◽  
Author(s):  
Stewart Coulter ◽  
Bert Bras ◽  
David Rosen
Keyword(s):  
Computer Aided Design ◽  
Preliminary Design ◽  
Design Tools ◽  
Multi Objective Optimization ◽  
Computational Framework ◽  
Linkage Design ◽  
Engineering Models ◽  
Aided Design ◽  
Dynamic Interference

Abstract Improvements in computer-aided design tools can significantly increase designer productivity. The ability to explore a variety of possible designs quickly and effectively is essential for a designer. In a previous paper, Goal Directed Geometry (GDG) was introduced as a computational framework for preliminary design, aiding the formulation of engineering models with geometric considerations, and the solution of these models with a multi-objective optimization package. The geometric considerations were limited to static noninterference constraints, introducing a metric and method for prevention of geometric interference between two subassemblies. In this paper, this metric and method are expanded to include the prevention of interference between moving subassemblies, or dynamic interference. Based on a series of repetitive static checks, this metric is intended to be accurate and simple for the designer to use. A case study is presented showing the GDG implementation for a linkage design problem, demonstrating the use of this metric. This parametric GDG model is then solved using an existing optimization program called DSIDES.

Preliminary Design of Tubular Composite Structures Using Netting Theory and Composite Degradation Factors

1995 ◽  
Vol 117 (4) ◽  
pp. 390-394 ◽  
Author(s):  
B. W. Tew
Keyword(s):  
Corrosion Resistance ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Composite Structures ◽  
High Strength ◽  
Preliminary Design ◽  
Light Weight ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Design Calculations

Tubular products and process vessels built using fiber-reinforced composite materials provide significant advantages in applications that require corrosion resistance, high strength, and light weight. A design approach based on netting theory is presented which enables engineers to develop preliminary structural designs for these structures using composite materials. The integration of creep, cyclic loading, and environmental degradation factors into initial design calculations is also discussed and illustrated.

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