Impact buckling of thin bars in the elastic range hinged at both ends
This is a 1934 NASA technical report, issued as a NACA-era memorandum, on how thin elastic bars hinged at both ends buckle under impact loads, written for engineers doing structural analysis. The first picture is a log-scale chart of f(a,b) against shock load b for several values of a, the second plots a dimensionless buckling ratio against a with a Eulerian load curve, and the third shows stress curves for different shock impulses S peaking near b of 0.6. For a designer these are dense engineering graphs, useful mainly as examples of plotted curve families with labelled axes and fine grid lines.
