Topological design for 3D-printing of carbon fibre reinforced composite structural parts

Design for additive manufacturing from a force-flow perspective

Introduction of New Concept U*sum for Evaluation of Weight-Efficient Structure

Flat ends of boilers with stress relief grooves have been used for many years. The existing standards set the value for the endplate thickness and admissible range of values for radius of the groove and the minimum thickness of the endplate under the relief groove. However, the codes do not specify the optimal parameters values for the endplate with stress relief groove. In this paper, the authors study the optimal choice of parameters for circular groove, and then propose its shape modification to elliptical, which considerably decreases stress concentration appearing in the zone of the groove. In the next step, the elliptical shape is replaced by the groove modelled by two spline functions, which results in further reduction of stress concentration. Finally, the groove with shape including several spline functions is proposed as an optimal one. In the performed study, the finite element modelling and the simple search method in optimisation procedures are used.

Parametric optimisation of stress relief groove shape in flat ends of boilers

A new parameter U** that represents load paths in structures is applied to a truck cab under collision. Since the main part of a compartment should be maintained in a linear elastic condition, a linear U** analysis can be applied. U** for the deformed body is statically calculated from the extracted deformation results of a crash simulation. A substitution-modulus method is applied to reproduce the material and geometrical nonlinearities. An index "m2-4msU**" is proposed as a standard condition for the truck cab. The predominant load paths along the floor member and the shear effect of the floor panel are demonstrated.

Load Transfer in Truck Cab Structures under Initial Phase of Frontal Collision

In recent years, a novel method for computing loadflow orientations and loadpaths, which is based on iterative solutions of non‐linear equations and finite element results, has emerged in the literature. In the present investigation, the prior formulation and approach has been enhanced by deriving explicit expressions for computing loadflow orientations. The new equations produce more accurate loadflow orientations and improve the fidelity of calculated loadpaths. In particular, for a typical loaded plate containing a hole, the density of loadflow lines is also shown to provide accurate values of stress concentration factor. Subsequently, loadflow visualisation for biaxially loaded plates containing non‐optimal and optimal holes is undertaken to identify key features of the stress distributions. It is found that regions of “recirculation” are apparent for non‐optimal hole shapes, whereas no recirculation zones are present for optimal shapes. In general, it is considered that loadflow visualisation is a simple but powerful tool for use by structural designers and analysts.

Advances in two‐dimensional structural loadflow visualisation

Airframe Life Extension By Optimised Shape Reworking — Overview Of Dsto Developments

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Advances in two‐dimensional structural loadflow visualisation

Airframe Life Extension By Optimised Shape Reworking — Overview Of Dsto Developments