Failure of metallic structures operating under shock loading is a common
occurrence in engineering applications. It is difficult to estimate the response of
complicated systems analytically, due to structure&rsquo / s dynamic characteristics and
varying loadings. Therefore, experimental, numerical or a combination of both
methods are used for evaluations.
The experimental analysis of the shocks due to firing is done for 12.7mm
Gatling gun and 25mm cannon. During the tests, the Gatling gun and the cannon
are located on military Stabilized Machine Gun Platform and Stabilized Cannon
Platform respectively.
For the firing tests, ICP (integrated circuit piezoelectric) accelerometers are
attached to obtain the loading history for corresponding points. Shock Response
Spectrum (SRS) analysis (nCode Glypworks) is done to define the equivalent
shock profiles created on test pieces and the mount of 25mm cannon by means of the gun and the cannon firing. Transient shock analysis of the test pieces and
the mount are done by applying the obtained shock profiles on the parts in a
finite element model (ANSYS).
Furthermore, experimental stress analysis due to shock loading is performed for
two different types of material and different thicknesses of the test pieces. The
input data for the analysis is obtained through measurements from strain rosette
precisely located at the critical location of the test pieces.
As a result of the thesis, a proposal is tried to be introduced where strain energy
density theory is applied to predict the shock failure at military structures.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12612721/index.pdf |
| Date | 01 December 2010 |
| Creators | Mercimek, Umit |
| Contributors | Kadioglu, F. Suat Prof. Dr. |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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