Sorry, here's the Cook & Rockey data table...
https://files.engineering.com/getfile.aspx?folder=8115ad36-5757-4d50-a512-228528e6fb59&file=Cook_and_Rockey.jpg
Yes, I had the wrong exponent for one of the terms in the Galambos equation for that case. With that correction, the 4 curves in my version of the Data Sheet agree fairly well with the 4 curves using the Galambos equations.
Also, the Cook & Rockey data for the case of long simple/short fixed...
My copy of the Data Sheet says "Third Issue June 1963"
The most recent reference referred to by the data sheet is:
Shear Buckling of Rectangular Plates with Mixed Boundary Conditions
I. T. Cook and K. C. Rockey
The Aeronautical Quarterly
Volume XIV, November 1963, Part 4
pages 349-356
I have a...
Sorry I just saw this. I have a copy of Data Sheet 02.03.01. I can confirm that nu is built into the buckling coefficient, with an assumed value of 0.3.
I did a quick comparison using the equations from Galambos as a baseline (Guide to Stability Design Criteria for Metal Structures, Fifth...
Maybe it's confusing because we're using the word "load" for both internal and external loads. The load P at the end of a cantilever beam is the external load, which causes internal loads and stresses at various locations inside the beam. The MS is written based on internal loads/stresses at...
I won't discuss your particular examples, but I will provide some general information.
You can think of limit load as the highest "actual" load the part will ever see. To ensure the part is safe at that load, we design it to the ultimate load, which is the limit load times a factor of safety...
here is the second picture I intended to send in the previous post
https://files.engineering.com/getfile.aspx?folder=1bf7b842-13d9-452f-84fe-9e1374ae30c2&file=pic1.JPG
Of course it depends on many factors, but for high aspect ratio wings, as used on commercial transports for example, the most commonly used shape is probably the Z section, at least for metallic structures. It is good because it has good bending stiffness (moment of inertia) and also has good...
The basic problem is: how do you use simple 1D test data (e.g. uniaxal tension, pure shear) to predict failure of real parts that are exposed to combined states of stress, possibly in 3D. Von Mises and Principal Stresses are one way to do that.
Since the VM stress is by definition a positive...
"Appendix C" of the following document is another source for the Ekvall methodology. I believe it is a publically available document via the DTIC technical reports website.
Development of Advanced Aluminum Alloys from Rapidly Solidified Powders for Aerospace Structural Applications, by R. E...
The most common material metrics are strength-to-weight (Ftu/rho) and stiffness-to-weight (E/rho). If you consider E/rho of aluminum, steel, and titanium, they all have about the same value, so there would appear to be little to choose. However, there are other metrics that are often more...
In computing vibration or buckling eigenvalues using Nastran SOL 103 or 105, an ASET is used to reduce the computational effort. Often, the translational DOFs are sufficient to describe the desired modes. Of course there are exceptions, so it is not a blanket statement.
For example, a...
The European Space industry has a document called "Threaded fasteners handbook" with ID number ECSS-E-HB-32-23A (the copy I am looking at is dated 16 April 2010). I think it is freely available on their website and should be easy to find.
Section 7.6.2 of that document is called "Compression...
When dealing with combinations of materials, it is better to deal with modulus weighted section properties (EA, EI, GJ) rather then simple area section properties (A, I, J). Assuming the outer shell is perfectly bonded to the inner foam, the stiffnesses of each will add to get the total...
The area of a cross-section is a measure of the axial stiffness and strength of the member, that is, how much does it stretch under a given axial load and at what load will it break. The moment of inertia of the cross-section is a measure of the bending stiffness and strength of the member...
The format for the BEAM element is given in the book "Finite Element Applications with Microcomputers" by J. Frank Potts and J. Walter Oler, published by Prentice-Hall in 1989.
You can view a copy on the Internet Archive if you create an account...
See attached description of MSC/MOD that I found in a 1988 computer magazine...
https://files.engineering.com/getfile.aspx?folder=4e62eff3-3100-44bb-9bcd-ce60407e6653&file=MSC-MOD.jpg
I do not recognize this format. If you are unable to find someone who does know, I will make a few guesses in case it helps.
BEAM
1 = you said material ID
.5 = you said section area
0 = since this is an integer, it may be a code to turn on or off certain options
.1 = you said section Ixx
.03 =...
It's going to depend on the fiber architecture involved. For thin lamina with unidirectional fibers, you can use the formulas in "Mechanics of Composite Materials" by Robert M. Jones. However, these will only give you the in-plane engineering constants, namely E1, E2, G12 and nu12. For woven...
The book "Design of Piping Systems" originally published by the M.W. Kellogg company in 1941 has flexibility factors and stress intensification factors for pipe bends in Chapter 3. The same information probably occurs elsewhere, but this is a pretty good reference. I think there are pdfs of...
