Help: Impact model

Table of Contents	ECSS	Model Page
Background Information	Miscellaneous models
	Particle/wall interaction model

Overview

This tool evaluates the ballistic limit equations for micro-particle environment risk analysis.

The input parameters and options are function of the selected shield configuration, as described below. When the input form has been completed, pressing the button will start the calculation and bring up the "Results" page.

Model parameters

Three sets of parameters have to be defined: one for the characterization of the impactor and one for the target including possible shield(s). Some parameters depend on the shielding configuration and only show up when needed by the selected configuration. The different types of shielding configurations are: .

Impactor parameters

Impact angle (with regard to the surface normal)
Particle density

Target parameters

for a single wall configuration:

Failure mode (e.g. no perforation)
Wall material
Wall thickness

for a dual wall configuration:

Bumper thickness
Bumper material
Wall thickness
Wall material
Spacing between bumper and wall

for other configurations:

Outer bumper thickness
Outer bumper material
Bumper thickness
Bumper material
Wall thickness
Wall material
Spacing between outer bumper and bumper
Spacing between bumper and wall

In some configurations the user can add a thermal blanket in front of the shielding. The required input is the areal density.

For penetration into a monolithic titanium and stainless-steel shield, specific modifications were made to the Cour-Palais semi-infinite plate cratering relationship based on test data. They are applied for the materials indicated with an asterisk i.e. (SS 15-5(*) and β-Titanium 15-3-3-3(*)).
for dual wall/other configurations the implemented fitting parameters are for an aluminium impactor.

Results

The particle/wall interaction tool produces the files listed in the table below. A description of the file formats can be brought up by clicking on their description in the table.

The report file spenvis_dap.html contains the input parameters and summary tables. The spenvis_dao.txt file contains the critical diameter as a function of the impactor velocity.

**Output files generated by the particle/wall interaction tool**
File name	Description
`spenvis_dap.html`	Report file
`spenvis_dao.txt`	Critical diameter as a function of the impactor velocity

To generate the plot, select the graphics format, and click the button. The current page will be updated with the newly generated plot files.

Last update: Mon, 12 Mar 2018