ASME International
0022-0817
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Demonstration of a New, Fast Probability Integration Method for Reliability Analysis The performance of a new, fast probability integration method which combines an improved equivalent normal concept and a scheme for linearizing a quadratic limit state is carefully examined. The examples tested include various combinations of linear and nonlinear limit states with normal and non-normal variables; some examples are considered the worst possible cases. It is demonstrated that the new method is able to provide accurate probability-of-failure estimates for most cases and performs reasonably well when the Rackwitz-Fiessler method produces severe errors.
Tập 109 Số 1 - Trang 24-28 - 1987
Structural Analysis of Two General Constraint Kinematic Chains and Their Practical Application The structural analysis of space linkages with two general constraints has been conducted by using Franke’s condensed notation. Linkages with mobility one and mobility two with up to three loops are considered. Censuses of chains with eight, nine, eleven and twelve links and a case study describing a practical application of these chains are presented.
Tập 93 Số 1 - Trang 231-238 - 1971
Some Applications of Graph Theory to the Structural Analysis of Mechanisms Concepts in graph theory, which have been described elsewhere [2, 4, 6] have been applied to the development of (a) a computerized method for determining structural identity (isomorphism) between kinematic chains, (b) a method for the automatic sketching of the graph of a mechanism defined by its incidence matrix, and (c) the systematic enumeration of general, single-loop constrained spatial mechanisms. These developments, it is believed, demonstrate the feasibility of computer-aided techniques in the initial stages of the design of mechanical systems.
Tập 89 Số 1 - Trang 153-158 - 1967
Type Synthesis of Plane Linkages The type synthesis of plane linkages can be formulated as a systematic enumeration of linear graphs. In this study, the concepts of a “contraction map” of a graph and of enumeration technique by permutation group are introduced in order to enumerate plane kinematic chains having 13 turning joints and 10 links. In addition, an algorithm for deriving all plane kinematic chains from those of a lower number of links is introduced.
Tập 89 Số 1 - Trang 159-170 - 1967
Improving Ultrasonic Machining Rates—Some Feasibility Studies Investigations are reported on the influence on removal rate of slurry liquid cavitation, low temperature, liquid metal, and stress corrosion embrittlement of the work material, tool vibration amplitude, grit size and method of application of slurry, and the influence of heat-treatment and applied stress conditions of the workpiece. From these studies it is postulated that there may be three basic mechanisms involved in the ultrasonic machining process—microchip removal and material displacement by plastic deformation, and particle removal by fracture.
Tập 87 Số 1 - Trang 39-46 - 1965
Torque and Stress Balanced Design of Helically Armored Cables A new linear model of the mechanical behavior of helically armored cables is introduced. This model can be used to establish the conditions necessary to achieve a torque balanced cable construction and the requirements for equal load sharing among the armoring wires. Existing linear models are unable to accomplish this and more exact nonlinear formulations are not readily usable. It is recognized that a cable model is needed which more accurately describes the physical behavior of cables and yet is capable of solution by hand-calculation. This becomes particularly important in preliminary design where many other variables are also involve. The proposed cable model is tested for accuracy by comparison with a manufactured cable shown to be torque balanced.
Tập 103 Số 1 - Trang 61-66 - 1981
Mechanics of Conventional Spinning In conventional spinning of cones, the cone-wall thickness variation was studied using blanks of 1100-0 commercially pure aluminum sheet of 0.050-in. thickness. The results revealed that the radial stress induced in the unspun flange is the major cause of nonuniform wall thickness of spun cones. The theoretical tangential force component was derived by use of the deformation energy method. Qualitative agreement was found between the theoretical and the experimental values of tangential force component in the underspinning conditions.
Tập 85 Số 4 - Trang 346-350 - 1963
A Theory of Shear Spinning of Cones The theoretical deformation mechanism of shear spinning of cones was re-evalued. It was found that the predicted tangential or power spinning forces for commercially pure aluminum and lead for several spinning conditions agreed well with the experimental data. In addition, the normal force and axial force components were also evaluated and fair agreement between theory and experiment was achieved.
Tập 83 Số 4 - Trang 485-494 - 1961
A Study of Shear-Spinnability of Metals The deformation zone in shear-spinning is idealized for a two-dimensional process and maximum permissible thickness reduction without fracture is predicted in terms of the stress system in this zone. The effect of deviation from the sine law on the maximum reduction before fracture is shown analytically to be due to the influence of distortions of the unspun flange on the state of stress under the roller. The results of analytical work are compared with experimental data and good agreement has been obtained. The phenomenon of back extrusion in shear-spinning is shown to be the result of a compressive stress in the spun section parallel to the mandrel side and is greatly influenced by mandrel angle and deviation from the sine law.
Tập 83 Số 4 - Trang 478-483 - 1961
Maximum Reduction in Power Spinning of Tubes An experimental technique is described for determining the maximum reduction in forward tube spinning as a function of the process variables. Results have indicated that for materials with tensile reduction of area above 45 percent a maximum spinning reduction of about 80 percent in one pass is the limit. Of all the process variables considered, only the feed had any appreciable influence on spinnability. In comparing maximum reduction with tensile reduction of area complete similarity was observed between shear (cone) and tube spinnability of metals. An approximate analysis is made to determine maximum reduction in tube spinning as a function of process variables and material properties. A brief discussion is presented on coefficient of friction in metal-forming processes.
Tập 86 Số 1 - Trang 49-54 - 1964