ANALYSES OF LAMINATED COMPOSITE, HOLLOW DRIVE SHAFTS

[Dojo2000]

http://newfirstsearch.oclc.org/WebZ/...agename=record [img]tongue.gif[/img] agetype=print:entityprinting=true:entitycurrecno=3 0:sessionid=sp03sw03-57401-d6zsmnmj-74abrm:entitypagenum=43:0

<blockquote>quote:</font><hr>
Title: ANALYSES OF LAMINATED COMPOSITE, HOLLOW DRIVE SHAFTS
Author(s): KIM, CHUN-DO
Degree: PH.D.
Year: 1993
Pages: 00208
Institution: THE UNIVERSITY OF OKLAHOMA; 0169
Advisor: Major Professor: CHARLES W. BERT
Source: DAI, 54, no. 11B, (1993): 5902

Abstract:
Cylinders laminated of advanced-fiber-reinforced composite materials, with polymer matrices, are widely used as structural components in the aerospace industry. Because of the high modulus, high strength, and low density of such materials, a significant weight saving can be realized. Thus, by appropriate design of the layup configuration, desirable performance can be obtained. For example, the use of composite cylindrical tubes would permit the use of longer drive shafts than is possible with conventional (aluminum alloy or steel) shafts designed to carry the same horsepower and weight per unit length.

In this study, theoretical analyses are presented for determining the critical speed, buckling torque, and dynamic instability regions of a circular cylindrical hollow drive shaft with layers of arbitrarily laminated composite materials by means of various shell theories. The theory used is the dynamic analog of the Sanders best first approximation shell theory. By means of tracers, the analysis can be reduced to that of various simpler shell theories, i.e., Love's first approximation, Loo's, Morley's, and Donnell's shell theories, also, to that of the more precise, but complicated Flugge's shell theory.

Also, a simplified theory for predicting the first-order critical speed of a shear deformable, composite material drive shaft is presented. The shaft is modeled as a rotating anisotropic Bresse-Timoshenko beam generalized to include bending-twisting coupling.

Also, a simple procedure to achieve an optimal design, considering critical speed, buckling, and material failure, is described and illustrated for a specific example. In order to consider the requirements for strength, the first-ply-failure criterion is applied by considering the effects of both driving torque and unbalance force due to mass eccentricity.
<hr></blockquote>

Sounds like what nova was talking about with carbon fiber driveshafts and stuff. Just thought this was nice info.

[Ike]

does it scare anybody else that i actually understand what that guy was talking about?

[Dominic]

No, because I do to. Previously a mech. engineer with good a background [img]smile.gif[/img]

[nova]

Wow! Somebody actually paid attention to something I said. :D [img]graemlins/burnout.gif[/img]

Its as I said though, one of the main advantages of CF over standard materials is that it can flex a great deal more without breaking. Its impact resistance is, however, less that desireable.

I'm currently attempting to design and produce some Carbon Fiber body panels for F-Bodies and in my design investigations have learned that I will have to build them with a thin layer of fiberglass over the outside to keep the panels from cracking and shattering under impact. Otherwise one rock is kicked up while driving and that means a whole new body panel.