L-191 Test set-up session - SCJ Workshop Appendix_H

August 2014
Emmanuel Schultz (Propulsion Technology)

This group dealt with the SCJ test against All-Up-Round Munitions.

The aim was to share best practice in this area, highlight difficulties or deficiencies (in general, or for specific configuration / munitions) and to clarify the STANAG where necessary.

It included discussions on the test requirement, the test set-up, measurement equipment, other equipment (e.g. conditioning plates) and evidence of the reaction level (e.g. reference in order to assess the pressure signal).

The topics of interest are described in more details hereafter:

What requirement would be the most suitable and how?

  •  A list of approved shaped charges and associated set-up?
  •  Specified jet characteristics at impact? (e.g.:V2D = V2D0 ± X%; D = D0 ± Z%;...)
  •  Other possibilities?

Test set up: standard and non standard examples of test arrangement:

  •  Type & configuration of the SCJ (w/ or w/o ballistic cap, probe)
  •  Type of conditioning plate (thickness and material)
  •  Distances: SCJ - conditioning plate, and SCJ - test item
  •  Any protection to prevent spall effect
  •  Impact point, munition configuration (w or w/o packaging, AUR or each energetic components individually, horizontal or not)
  •  Position of measuring equipment
  •  Positioning of protective equipment
  •  Reproducibility
  •  How do we ensure the charge operated properly?

What type of measuring equipment is used, how they are used and for what:

  •  Video, high speed video
  •  Pressure gauges
  •  Photography
  •  Wave velocity measurements in the munition tested
  •  Any other (like ballistic pendulum mentioned in the STANAG, thrust measurement,…

Test procedure:

  •  Test on an inert item
  •  Calibration of pressure with regards to the signal generated by the SCJ itself.
  •  Calibration test to discriminate between reaction type
  •  Number of tests

Assessment of the reaction level:

  •  Is there issue with using the response descriptors
  •  Which evidence are the most useful to assess the reaction level