Pulse–pressure loading effects on aviation and general engineering structures—review
Abstract This paper reviews various aspects of modeling an explosion on an aircraft, which can be extended to more general structures. A brief summary of material and structural models is given, followed by a detailed history of pulse–pressure loading models with an emphasis on free–free beams and how pulse characteristics affect a structure's response. Techniques to desensitize pulse shape effects are discussed, which culminate in the form of pressure–impulse isodamage curves. Studies using random loading models are also presented.
Design and explosive testing of a blast resistant luggage container
The development and testing of a blast resistant luggage container is detailed. A design was conceptualized and an analytical feasibility study was performed. Once the results of this analysis proved positive, more detailed models of the container structure were developed, small scale design specimens were constructed and tested to determine strength, and a 7irst prototype was developed. Blast loading predictions were made with a modified wave tracing and combustion code. The first prototype was tested to failure. Based on these results, structural response and blast loading models were modified and a second generation prototype was developed. This container successfully withstood the detonation of a bomb larger than that which caused the loss of Pan American flight 103 over Lockerbie, Scotland in December 1988.
Vibrations of a mass-loaded clamped-free Timoshenko beam
The purpose of this study is to determine the influence of rotary inertia and shear deformation on the motion of a flexible robot arm modelled as a cantilevered Timoshenko beam with a lumped moment of inertia at the free end. The first five natural frequencies and modal shapes of this Timoshenko beam are determined. The frequency results are presented graphically in three-dimensional plots as a function of the (tip mass)/(beam mass) ratio and the (radius of gyration of the tip mass)/(beam length) ratio.