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ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

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as 221.5 MPa. This value is more than 2.5 times higher than value obtained in the first<br />

case. The highest values of 1 st principal stress are over 300 MPa. It can be assumed that<br />

the struts with such high values will be damaged and the stress field will be<br />

redistributed.<br />

Fig. 4. Dependence of 1 st principal stress on struts orientation relating to loading plane<br />

(XY)<br />

6. CONCLUSIONS<br />

The highly porous ceramic foam was study. The computational model was created using<br />

micro-CT and subsequent image processing and was analyzed by a finite element<br />

method. The 1 st and 3 rd principal stresses were evaluated and their influence on struts<br />

behavior was estimated.<br />

The research shows that the individual struts rotation in whole structure of highly<br />

porous ceramic foam is significant. Rather parallel struts (up to 40°) are not so loaded<br />

and the median of 1 st principal stress was evaluated as 87.2 MPa. On other side, for<br />

rather perpendicular struts (from 40° to 90°) it was found the median of 1 st principal<br />

stress as 221.5 MPa. This value is more than 2.5 times higher than value obtained for<br />

struts oriented from 0° to 40°.<br />

The aim of next research is determined local fracture criterion which would be able to<br />

describe the fracture behavior of individual struts and subsequently fracture behavior of<br />

whole structure of high porous ceramic foams. A wide range of experiments will<br />

necessary to do for different sizes of examples and different topology and density of<br />

struts.

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