^Back To Top
In an effort to help designers better assess the downstream life cycle impacts of their design choices, manufacturing companies and researchers have developed many design decision support tools referred to as Design for X (DFX) methodologies. The ‘X’ in DFX represents any one of a variety of design considerations occurring throughout the product life cycle, such as quality, manufacturing, production, assembly or environment. A DFX decision support tool can take many forms. It could be procedure or a set of guidelines on paper, or it could be a computer program that performs various types of analyses resulting in cost, manufacturability, or performance estimates, which are then used by the designer in making decisions. This paper gives an overview of research that is expanding the domain of design for X-Abilities (DFX) into new and important areas. The paper concludes with some general guidelines that suggest how manufacturing firms can develop useful, effective DFX tools.
Download Full Text
The complete sets of second-and third-order elastic constants of the cubic fullerene C60 have been obtained using the strain energy density derived from interactions up to three nearest neighbors of each molecule in the unit cell. The finite strain elasticity theory has been used to get the strain energy density of C60. The strain energy density is compared with the strain dependent lattice energy density obtained from the continuum model approximation and the expressions for the second-and third-order elastic constants of C60 are obtained. The second-order potential parameter is deduced from the measured second-order elastic constant of C60 and the third-order potential parameter is estimated from the Lennard-Jones interatomic potential for C60. The inter lattice displacements, the three independent second-order elastic constants and the six independent third-order elastic constants of C60 are also determined. The second-order elastic constants are compared with the experimental elastic constants of C60. The third order-elastic constants are found to exhibit anisotropy in certain directions of the elastic wave propagation in the crystal. We also study the effect of pressure on the second-order elastic constants of C60.
Download Full Text