GKN Aerospace Engineering Services

Port Melbourne, Australia

GKN Aerospace Engineering Services

Port Melbourne, Australia
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Bardell N.S.,GKN Aerospace Engineering Services
Australian Journal of Mechanical Engineering | Year: 2011

A review of the use of interaction equations as a means of quantifying the integrity of aerospace structures under combined loading is presented. The main methods of solution for the proportional reserve factor are discussed, with emphasis placed on present-day industrystandard numerical methods. Examples are presented that demonstrate the comparative ease with which interaction equations can now routinely be solved quickly and accurately. The application of this capability to the design of modern aircraft structures is reviewed and its usefulness as a complementary tool to finite element analysis is discussed. © Institution of Engineers Australia, 2011.


Bardell N.S.,GKN Aerospace Engineering Services | Evans G.J.,GKN Aerospace Engineering Services
Australian Journal of Mechanical Engineering | Year: 2012

A brief review is presented of the sand-heap analogy as a means of determining the ultimate plastic torque capacity of a ductile metallic prismatic bar of known cross-section. A novel method using an industry-standard computer-aided design (CAD) tool is then described for determining the shape and corresponding sand-heap volume for a general cross-section that can include the presence of keyways, fillets, rebates, and holes. Existing solutions for simple regular cross-section shapes are used as a benchmark for the solutions from the new method, and perfect agreement is found. Subsequent examples are presented which demonstrate the ease with which sand-heap formations and their corresponding volumes can be found for more general cross sections that are more representative of those used in practical engineering applications. © Institution of Engineers Australia, 2012.


Bardell N.S.,GKN Aerospace Engineering Services
14th Australian International Aerospace Congress, AIAC 2011 | Year: 2011

A review of the use of interaction equations as a means of quantifying the integrity of aerospace structures under combined loading is presented. The main methods of solution for the proportional Reserve Factor are discussed, with emphasis placed on present day industrystandard numerical methods. Examples are presented which demonstrate the comparative ease with which interaction equations can now routinely be solved quickly and accurately. The application of this capability to the design of modern aircraft structures is discussed and evaluated.


Bardell N.S.,GKN Aerospace Engineering Services | Frazer N.E.M.,GKN Aerospace Engineering Services
Australian Journal of Structural Engineering | Year: 2012

A simple matrix-displacement method is presented here to facilitate the static analysis of rigidly-jointed coplanar beam frames. The geometric arrangement of the frame, the boundary conditions, the material properties, and the external loading, are allowed complete generality, thereby enabling a large range of 2D structures to be modelled. Point loads, self-weight, inertial and distributed loads may all be accommodated in the analysis; emphasis is placed on the inclusion of the distributed loads, since these prove a more significant challenge to represent accurately in a matrix-displacement type of analysis. The chief novelty of this work is that for such structures exact solutions may be obtained with great ease for the displacement, reactions, and the individual member bending moment, shear force, and axial force, through the inclusion of suitable serendipity functions in the element formulation. The computational effort is the minimum possible for this class of problem, requiring the solution to just 3S simultaneous equations, where S represents the total number of junctions or nodes used to define the frame. Such solutions can easily be implemented using desktop computing, and five examples of increasing complexity are presented herein to demonstrate the efficacy of the method. © Institution of Engineers Australia, 2012.

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