Showing papers in "Nuclear Engineering and Design in 1974"

TL;DR: In this paper, a number of finite element models are called into attention for the idealization of composite structures such as reinforced and prestressed concrete components, and different inelastic constitutive models are proposed for the behaviour of concrete in the pre- and post-failure regime.

TL;DR: In this paper, the problem of the harmonic forced vibrations of a massless rigid disc supported on an elastic layered medium is studied and the resulting mixed boundary value problems are reduced to sets of Fredholm integral equations that are solved numerically for a wide range of frequencies.

TL;DR: In this article, an elastic three-dimensional finite element which allows the mode I-mode II inverse square root crack front singularity is described and a threedimensional solution for the compact tension fracture specimen resulting from use of the element is given.

TL;DR: In this paper, the authors present a survey of the recent developments in linear heat transfer analysis and present the techniques that permit the practical analysis of large and complex three-dimensional heat conduction problems.

TL;DR: A review of the work done during the last few years on the dynamic interaction between thermal fields and solid bodies is presented in this paper, where memory effects, both in the mechanical and thermal response (i.e. viscoelasticity and second sound), are also discussed.

TL;DR: In this article, the feasibility of representing a three-dimensional soil-structure interaction problem by a plane strain model, and the errors involved in such representation, were studied. But it is not possible to obtain a two-dimensional representation that will approximate both the dynamic stiffness and radiation damping over a reasonable range of frequencies.

TL;DR: In this article, a comprehensive method of analysis for nuclear fuel rods was presented by first developing appropriate constitutive relations for the fuel and the clad materials that take into account elastic-plastic behavior, primary as well as secondary creep, mechanical densification (hot pressing), fuel swelling, fuel cracking and healing, and fuel redistribution.

TL;DR: In this article, it was shown that the rate of advance of a quench front over a hot surface is a function of the initial temperature, the thickness and the physical properties of the hot surface, and the cooling water flow conditions.

TL;DR: A survey of both the continuum and the finite element approaches to the soil-structure interaction problem is made in this article, where the limitations and advantages of both methods are evaluated with an emphasis on the present state of the art.

TL;DR: In this article, a least square type statistic operating on exit enthalpy differences was developed to ascertain, in conjunction with the COBRA-II subchannel computer analysis, an optimum value for the coefficient of Rowe and Angles's single-phase mixing correlation β.

TL;DR: In this paper, the natural frequencies of cylindrical shells clamped at one end and closed at the other by different types of shells of revolution (cones, hemispheres, ellipsoids, etc.) were determined using programs written for the digital computer.

TL;DR: In this article, the failure probability for a pressure vessel is made on the basis of linear elastic fracture mechanics (LEFM). Failure is identified by actual crack length equal to critical crack length.

TL;DR: In this article, a two-dimensional transient heat conduction model for rewetting a hot surface by a falling liquid film predicts that for stainless steel, Inconel or Zircaloy only a wall thickness of some 0.020 in.

TL;DR: In this paper, a thermal stress initiated mechanism for fuel-coolant interaction problems is presented using elastic stress theory for the cases of both temperature-dependent and independent mechanical properties, including the effect of the choice of surface heat transfer boundary condition and the compressibility of the unsolidified inner core.

TL;DR: The use of recently declassified boride and carbide additives and selective thermal arrest hydriding cycles have simplified the manufacture of crack-free massive hydrides of a variety of hydridable metals and have improved the mechanical properties of the as-fabricated and the thermally aged hydride as discussed by the authors.

TL;DR: In this article, the problem of fracture propagation and arrest in a cylindrical pressure vessel containing an initial surface flaw is considered, where the flaw has the most unfavorable geometry and orientation, namely, a crack lying on a meridional plane.

TL;DR: The current version of the computer program NONSAP for linear and nonlinear, static and dynamic finite element analysis is presented and the solutions of some sample problems considered during the development of the program are presented.

TL;DR: In this paper, a polynomial expansion of the displacement model is proposed to improve the stiffness of the model, e.g. by direct approximation of the strain field as opposed to its derivation from the displacement field.

TL;DR: In this article, the authors present a survey of the shakedown theory, including the accommodation of a structure to the prescribed loading range as well as inadaptation and unserviceability of elastic-plastic structures under repetitive and fluctuating loads.

TL;DR: In this article, the vibrational behavior of two long, elastic, coaxial cylindrical shells containing conveying fluid was analyzed using an exact and approximate formula for the added mass of the fluid.

TL;DR: In this article, the validity of approximating frequency-independent foundation impedance functions by constant parameters was evaluated for nuclear power plant structures, and the results such as frequencies, damping, and in-structure response spectra were then compared.

TL;DR: In this article, a stochastic model is presented for predicting the elastic response of light multi-degree-of-freedom secondary systems to strong motion earthquakes, and the influence of nonstationarity is evaluated.

TL;DR: Experimental and theoretical investigations are reported on the flow and temperature distribution in local recirculating flows in rod bundles, downstream of a blockage, showing that with a sufficiently high Reynolds number, similar geometry and similar heat distribution, the dimensionless temperature fields in recirculation flows are equal and independent of the Reynolds and Prandtl numbers.

TL;DR: In this article, the use of lithium hydride (LiH) as a highly efficient neutron-shielding material is considered, which contains, combined into a single, stable compound, two of the elements most effective in attenuating and absorbing neutrons.

TL;DR: In this article, a method of analysis and the associated computer program are presented for the purpose of solving steady-state nonlinear heat transfer problems in two-dimensional structures, where the nonlinearity arises from the dependence of the thermal conductivities on temperature as well as from the presence of rediative heat transfer between parts of the structure.

TL;DR: IAMBUS-1 as discussed by the authors is a digital computer code for the thermal and mechanical design, in-pile performance prediction and postirradiation analysis of arbitrary fuel rods, and some numerical results illustrating typical and diverse IAMBUS usage.

TL;DR: In this article, the authors present a rational procedure for calculating the velocity of tornado-generated missiles, including the setup of a simplified three-dimensional tornado wind model, a mechanism for the missile to be injected into, and sustained in, the wind field, as well as the description of missile acceleration in the wind fields, based on the centrifugal force consideration.

TL;DR: In this paper, a theoretical analysis has been performed to study molecular and turbulent transport phenomena between subchannels of infinite bare rod arrays at laminar, transition and turbulent flow conditions.

TL;DR: In this paper, a high precision triangular plate bending element for the analysis of thick plates is developed in thin paper, which has three nodes and 12 degrees of freedom per node, and explicit expressions for stiffness coefficients are derived.

TL;DR: In this paper, the finite element technique was employed in the solution of elastic-viscoplastic problems, and the solution algorithm employed is relatively simple and possesses many advantages over the conventional computational procedures utilized in elasto-plastic material analysis.