Assessment of injuries caused by complex blast waves using Axelsson's method

Authors:

  • Niklas Johansson

Publish date: 2016-10-26

Report number: FOI-R--4300--SE

Pages: 33

Written in: Swedish

Keywords:

  • Blast waves
  • Lung damage
  • Axelsson’s method
  • Blast Test Device
  • Heun’s method
  • Damage assessment simulation
  • MATLAB

Abstract

The report describes how Axelsson's method has been used to assess damages to humans caused by blast waves from detonations, in order to verify that the method and the equipment used works in a few simple cases. With Axelsson's method, the human torso is modeled as a one-dimensional mass-spring system. The simulated chest wall velocity is used to assess the damage a detonation would have had on a human lung. Three different scenarios were studied. To get pressure data input to the model in Axelsson's method, experimental trials were performed with a simulated human torso in the form of a metal cylinder, a so called Blast Test Device (BTD), with pressure sensors which registers the pressures around the cylinder. To solve the differential equations from Axelsson's method that describe the compression of the chest wall, Heun's method was used to numerically solve them. The solutions were used to determine the probable damage outcome from all trials. The results seem to agree with results from previous trials, which implies that the method should be suitable to be used to evaluate lung injuries caused by blast waves in more complex environments.