Shaft alignment using strain gages: case studies

Capabilities of the NRCC/NAE flight impact simulator facility

This report describes the NRCC/NAE Flight Impact Facility in which birdstrike tests on aircraft parts can be carried out. Technical Information is given on the capabilities of the pneumatic cannon used to fire real bird carcasses against stationary targets, and on the auxiliary apparatus and instrumentation available at the Facility.

The effective lenght of a crack terminated by a hole

The influence of a small hole at the tip of a crack on the compliance of a cracked specimen is examined. It is shown that the compliance of the specimen with a hole is the same as the compliance of a specimen with an infinitely sharp but slightly longer crack, the increment of length being proportional to the radius of the hole. In the case of...

CURSHL: a high-precision finite element for shells of arbitrary shape

CURSHL is a high-precision finite element for the linear statie stress analysis of thin elastic shells of quite general shape. The element is a fully-conforming displacement element of curvilinear triangular form. The theoretical basis of the element is presented in fairly complete detail, and some aspects of the organization of the computer...

Application of the high precision triangular plate-bending element to problems with curved boundaries

The application of the high precision triangular plate-bending element to problems with curved boundaries is considered. Appropriate edge conditions for nodal points on these boundaries are derived. The error inherent in representing a curved boundary by a series of straight segments is found to be the limiting factor on accuracy, while the...

A high precision triangular plate-bending element

A fully conforming, displacement-type, finite element of triangular shape is developed and applied to the solution of several problems in the bending of plates. The deflection is represented by a fifth degree polynomial in the Cartesian co-ordinates of the mid-plane. Six deflection parameters, namely the displacement and its first and second...

Tables for the stress analysis of uniform circular rings

Tables are presented that facilitate the calculation of stresses and deflections in uniform circular rings . The tables essentially give the solution for a ring loaded by a set of elementary point loads, and, from them, the solution for a ring under a general system of concentrated loads can be obtained by superposition. The cases of in - plane...

Some remarks on a theory of creep-rupture of pressure vessels

A theory of creep-rupture of thick-walled cylindrical pressure vessels due to Rimrott, Mills, and Marin, is put in a more conveniently applied farm by introducing the concept of an effective stress. The theory is compared with available experimental data. Reasonable agreement is obtained in some cases, while in others better agreement is...

Stress concentration around shallow sperical depressions in a flat plate

A theoretical elastic stress analysls is given of an infinite flat plate which is loaded in uniaxial tension and which is weakened by two shallow spherical depressions cut symmetrically into each surface of the plate. Results are presented in the form of (i) tabulated functions from which the stresses and stress gradients at any significant...

Structural analysis of turbine rings: Calculated stresses in scalloped rings of constant section

Calculated stress data are presented for turbine rings suitable for tip-driven turborotors; these rings, whose function is to carry the turbine rotor blades, consist of short independent segments which are pinned to the supporting fan blades, and are arched or scalloped ta carry the operating leads more effectively. It is demonstrated that the...

Thermal stresses in multi-layer spherical shells

This report considers a thin spherical shell, the skin of which is made up of a number of uniform layers of different materials bonded together, and the stresses which occur therein as a result of a steady temperature gradient across the skin and internal pressure. After the metbod of stress calculation is outlined, numerical results are...

Thermal stressing due to an arbitrary heat source in a circular cut-out

This report presents formulas for the thermal stresses and d1splacements 1n a circular elastic piste with a concentric circular cut-out due to an arbitrary but steady heat input at the edges of the plate. Formulas for thermal stresses in an infinite plate with a single circular cut-out are obtained as a limiting case. Numerical results are...