NACA-RB-L4D29

Abstract

INTRODUCTION <br>The problem of predicting the strength of stiffened curved sheet under shear loads has received only a moderate amount of attention In the past. One particular aspect of the theory has beep treated to some extent, namely, the theory of pure diagonal tension in curved sheet. It Is well known, however, that the theory of pure diagonal tension is generally too conservative for use in design. The investigations by Schapitz (reference 1) and by Limpert (reference 2) were not very conclusive, and the Investigation by Thorn (reference 3) was Intended only to demonstrate the strength of a particular type of construotlon. An investigation of stiffened curved sheet under shear Mads has therefore been started by the National Advisory Committee for Aeronautics. <br>The project is of considerable&#160;magnitude and will' not be completed for some time- For these reasons and because of the lack of available information; it was considered desirable to publish, before completion of the projects such test results as might be of some direct usefulness to the designer. The present paper describes the spec$means tested to date aryl gives the observed skin-buckling stresses and the ultimate strengths developed.