No abstract available

[en] Connecting device between an arm and the handling gripper of the manipulator, enabling the gripper to be changed remotely, comprising a gripper holding assembly that can pivot to turn the gripper about its axis and a control assembly that can move axially inside the gripper holding assembly by means of a traction system associated with the manipulator arm to open and shut the gripper; each assembly includes not less than two remotely removable parts. This various parts are joined by bayonet connectors and locking devices

No abstract available

No abstract available

[en] Thermally actuated shims designed for the Large Coil Test Facility (LCTF) provide passive clamping capability for inaccessible structural interfaces. These shims were designed to hold the test coils tightly in place against the bucking post. This particular interface is relatively inaccessible, tends to loosen as the structure cools down, and experiences high loads due to magnetic interaction of the test coils. As designed, the shims are loose at assembly and tighten as the temperature of the structure decreases. These devices utilize the difference in the thermal coefficient of expansion of materials to drive a double acting wedge which causes an increase in shim thickness as the temperature is decreased. These magnets are for fusion applications. 1 ref

[en] The discharge chamber of the tokamak device is described. It includes smooth-walled electrically closed metallic sections with branch pipes electrically connected with the chamber by the operture circuit. To decrease the forces affecting chambes walls due to the reduction of distortions from branch pipe apertures in current distribution in the chamber walls, the branch pipes are equipped with shunting rings ajoining the chamber in the aperture circuit

[en] A guide structure is described for aligning fuel assemblies of a nuclear reactor and for guiding control elements for telescoping movement within guide channels of fuel assemblies. (E.C.B.)

[en] Dynamic partitioning or substructuring is the reduction of degrees of freedom by neglecting the dynamical influence of higher modes of certain substructure. One of the major reasons for these techniques not being widely accepted is the lack of criteria to judge the accuracy of the computed data. So far as natural frequencies are concerned a theorem is formulated which gives upper bounds for the error due to dynamic substructuring. The theorem is tested by applying it to a special statically exact substructuring method which is gained from a fixed-mode approach. The error estimation turns out to be strict enough to decide on the validity of DOF-reduction. (orig.)

[en] Failure localization in a variety of mechanical structures may be ascribed to elevated temperature, which may be effectively analyzed by employing the inclusion model. This work presents an explicit solution to the plane thermal inclusion problem, based on the customized Green’s function. A contour integral representation is further developed so as to provide an effective and straightforward approach for treating an arbitrarily shaped inclusion. Several benchmark examples are examined to validate the present solution. (paper)

[en] Optimal structural design under creep conditions, initiated over 20 years ago, brings a fairly large variety of problems, interesting both from theoretical and engineering point of view. Existence of the time factor leads to optimization for a prescribed lifetime and the number of independent variables in governing equations increases by one. Practial importance is connected with design of metal structures working at elevated temperatures, structures made of plastics, concrete etc. Here we discuss optimization problems with constraints imposed on brittle and ductile creep rupture, stiffness, creep buckling, dynamic behaviour. Some further possible directions of development are mentioned as well. (orig.)