a b s t r a c tThe objective of this work is to define a simple linear model of joints used in aeronautics and to update this model efficiently.Industrial designers usually resort to semi-empirical linear joint models to represent the behavior of the joints of a large aeronautical structure. Here, we propose to develop a one-dimensional linear joint model which is capable of representing the behavior of every joint of a large structure globally while enabling local nonlinear reanalysis of the most highly loaded joints. Work on nonlinear reanalysis is not considered in this paper.In order to solve the numerical difficulties encountered in some of modeling situations, an updating strategy based on the constitutive relation error is proposed. Since the updating efficiency is significantly affected by the ratios of the stiffnesses of the different parts of the model, the strategy consists in rigidifying some parts of the model in order to control the updating accuracy and the rate of convergence. The numerical results of a standard model and a rigidified model illustrate the updating improvements allowed by the strategy.
_-THE BRITISH MEDICAL _70URNTAL. [May i5, i869. CORRESPONDENCE. EXPLA'NATION REGARDING THE REPORT OF THE ACTION OF MERCURY. SIR,-In the Report of the Edinburghi Committee on the Action of Mercury, which appeared in the JOURNAL of May 8th,it is stated that'"all the operations" for biliary fistulae were performed by me. In this matter, the reporter has fallen into error. Of the thirty-three operations, o-ie was performed by Dr. Fraser, two by Dr. Gamgee, and the rest by myself. The fr~st operation was done by Dr. Gamgee, who, when the Committee began its work, was more familiar than any of us with the operative procedure necessary. I did most of the operations, not because I was possessed of any unusual skill in such procedures, but simply on account of Dr. Gamgee and me agreeing that, while he should undertake the chemical work~, I should attend to the surgery required in the researchi. I am, etc.,
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