A Mechanical Analyzer for Computing Transient Stresses in Airplane Structures

Abstract

A mechanical-analogy-type analyzer is described which is used for computing the transient stresses in an undamped elastic structure. The two main functions of the analyzer are (a) to evaluate the stresses due to the deformations of an elastic structure in its various normal modes, and (b) to superpose the effects of the modes with proper regard taken of their phase relations. Function (a) is accomplished by the use of torsional-pendulum simulators, and function (b) by the proper design of the electronic pickup and recording circuit. The analyzer is particularly useful in the determination of dynamic landing stresses in airplane structures.

Influence of fibre orientation on pultruded GFRP material properties

“…Considering the orthotropic nature of FRP composite, the effect in its thickness direction is generally ignored which is very small compared with the in-plane dimensions [2]. In this study, pultruded GFRP is reasonably regarded as a tetragonal material [23], which assumes that its material properties in the thickness direction is the same as one other direction. Apart from investigations on wood (e.g.…”