You can read the first three posts in this series here: Post 1, Post 2, Post 3 There are limited options for dealing with a hole in a shear web. There is a often used ESDU reference for this situation. ESDU sheets are a commercial product and unless you, or your organization have paid for […]

You can read the first two posts in this series here: Post 1, Post 2 When you calculate a buckling allowable that is beyond the material shear yield stress the allowable is unrealistic. For shear buckling this can be particularly problematic as the shear yield strength is not typically given in the common material data set so […]

To refine the simple buckling analysis in the first post you can take account of the panel edge fixity and account for material non linearity. This post concerns how to take account of panel edge fixity. The method I prefer is defined in (NACA-TN-2661, 1952), this reference is the grand daddy of aircraft buckling source material. This paper […]

Writing the text book has been a good opportunity to go and re-examine the fundamentals of panel buckling analysis. Shear Buckling of a thin (elastic) panel is a good place to start. First of all, Terms: Why use the term elastic buckling? When you use Young’s Modulus to calculate the buckling allowable no allowance is […]

Brazing is not widely used in the aircraft industry. Recently we were asked to substantiate a number of brazed joints by one of our clients and that give us the opportunity to research this subject. This is a brief summary of the material from our soon to be released text book. The general opinion is that a brazed joint […]

In 2 or 3 months we will have the first draft of our Structures Analysis text book ready to release. We will be sending out advance alpha review copes to everyone on our mailing list.  If you want to join in the review process it will be your chance for you to help us check […]

This is a method that can be used to reduce the apparent high stresses caused by geometric stress concentrations in fine mesh FE models with linear material properties……which is quite a mouthful. In my few years in the analysis trade I have noticed that structures, despite the advances in analysis tools, have not been getting much […]

In the course of writing a section for the textbook, I found a version of the Needham method in the US Airforce Stress Manual, there was one small error in the source material which is corrected in both the textbook and the spreadsheet file. Section crippling can be a stand alone check, or can be used […]

The three volumes of the NASA structures manual