Ladder development update Results from SiC 01 test Profile from SiC 03 Mechanical properties of foams

SiC 01- Sample Cool Down Sample cooled down down to -38 o C over a period of 175min. 3 plots taken at -38 with 30min interval between each. 2 further plot taken at -40 with 15min gap. Final plot taken when pressure was released (during this the temperature changed from to -37.2).

SiC 01- Profile Plots Top two plots show 2D profiles of SiC 01 at 21.3 o C and o C. Bottom left plot is the difference between the two.

SiC 01- Results Table Time (min)Temp ( o C)Max Z Displacement (microns) Min Z Displacement (microns) X co-ordinate for Max (microns) X co-ordinate for Min (microns) Magnitude of displacement (microns) Numbers high lighted in red where used in plots shown on the previous slide

SiC 03 High spot at 568 microns due to dirt on the surface. Low spot comes from gap in the Si and the sensor picking up a signal from the Al sample holder. Z displacement magnitude approximately 500 micorns.

SiC 03 - Glue pillars LCD microscope output from laser shows difference between inner and outer glue pillars Outer Edge Inner Si as seen by laser microscope

Basic model consists of interconnecting open celled cubes and, if structure is dominated by wall bending failure, then mechanical properties follow scale laws. For elastic modulus: Constant of proportionality has been shown to be close to unity in experiment and numerical simulation. Simon Canfer is now testing a selection of SiC and RVC to test this theory. The full list of mechanical properties that can be determined are: 1.Elastic modulus under compression 2.Poisson's ratio under compression 3.Flexural strength To test under tension will require making samples in different geometries. Thermal properties that can be tested are: 1.Coefficient of thermal expansion 2.Moisture absorption Mechanical Properties of Foams