Showing papers in "Journal of Engineering for Industry in 1973"
397 citations
210 citations
158 citations
146 citations
108 citations
105 citations
101 citations
82 citations
78 citations
77 citations
TL;DR: In this article, the concept of minimum recoverable strain energy is applied in the determination of pressure fields, and in companion papers the concepts are developed into design formulas, which are described.
Abstract: This is one of a series of papers by the authors on the loads exerted by bulk solids on containing bins. In this paper, the concepts are described. In particular, the principle of minimum recoverable strain energy is applied in the determination of pressure fields. In companion papers the concepts are developed into design formulas.
TL;DR: In this paper, an initial study has been made of a method for optimizing finite element grids based on the minimum potential energy where th nodal point positions are also treated as independent variables.
Abstract: : An initial study has been made of a method for optimizing finite element grids. This method is based on the minimum potential energy where th nodal point positions are also treated as independent variables. Necessary conditions have been obtained for the optimized grids. Case studies demonstrate the procedure for a one-dimensional tapered bar under axial load and for a two-dimensional square membrane subjected to a parabolic tensile stress. The optimized grids were observed to give improved stress estimates. (Author)
TL;DR: In this paper, the screw axis geometry associated with displacements of points and lines is studied and analytical expressions are developed for rigid body screw displacements which have one or more free parameters.
Abstract: The screw axis geometry associated with displacements of points and lines is studied. Analytical expressions are developed for rigid body screw displacements which have one or more free parameters. It is shown how to apply these results to the synthesis of spatial linkages. The theory is illustrated by numerical examples in which Cylindric-Cylindric cranks are designed to guide two points in a rigid body through five and then nine specified positions.
Esso1
TL;DR: In this article, the first phase of the development of computer programs for calculating elastic stress intensity factors at the critical (fatigue-prone) details of pressure hulls is summarized.
Abstract: : The report summarizes the first phase of the development of computer programs for calculating elastic stress intensity factors at the critical (fatigue-prone) details of pressure hulls. The work is part of a broader study aimed at the development of analytical methods for fatigue and fracture analysis of submarine hulls. Two new techniques are introduced. One is based on direct application of the linear elastic fracture mechanics relations between the stress intensity factors and the near crack tip displacement fields utilizing two-term series expansion. The stress intensity factors are computed directly from the nodal displacements obtained previously from the finite element program. The second technique is based on direct incorporation into the finite element computer program of the strain energy of the singular element enclosing the crack tip. Examples of the application of such methods to several simply axisymmetric and two-dimensional plane strain problems are presented along with recommendations for future studies and applications. (Author)