Nodal and modal strategies for longitudinal thermal diffusivity profile estimation: Application to the non destructive evaluation of SiC/SiC composites under uniaxial tensile tests

2009 ◽  
Vol 52 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Matthieu Bamford ◽  
Jean Christophe Batsale ◽  
Olivier Fudym
Keyword(s):  
Thermal Diffusivity ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Non Destructive Evaluation ◽  
Sic Composites ◽  
Profile Estimation ◽  
Non Destructive

High Velocity Impact Damage Assessment in SiC/SiC Composites

2014 ◽  
Author(s):  
Christopher R. Baker ◽  
Emmanuel Maillet ◽  
Gregory N. Morscher ◽  
Andrew L. Gyekenyesi ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Elevated Temperatures ◽  
Impact Damage ◽  
Ceramic Matrix Composites ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Sic Composites ◽  
Actual Damage ◽  
Damage Condition

Foreign object damage in gas turbines presents serious safety and financial concerns. As the aerospace industry draws closer to implementing ceramic matrix composites (CMCs) in gas turbines, the corresponding behavior in these materials after such events needs to be understood. To address this requirement, several silicon infiltrated fiber reinforced SiC/SiC coupons were impacted with high speed projectiles with velocities up to 360 m/s with an impact rig built at the University of Akron and NAVAIR. The resulting damage states were assessed using several non-destructive evaluation (NDE) techniques and compared to actual damage condition observed through the sectioning of impacted coupons. Ultimately, the true consequence of the damage was revealed by measuring the post-impact, residual strengths via uniaxial tensile tests to failure at both room and elevated temperatures. Lastly, the NDE results revealed a complicated damage morphology consisting of in-and-out-of plane damage that significantly affected the retained mechanical properties.

Determination of Mechanical Properties of Magnesium Alloys and Composites by Small Punch Testing

2016 ◽  
Vol 821 ◽  
pp. 435-441 ◽  
Author(s):  
Denisa Bártková ◽  
Jiří Langer ◽  
Petr Dymáček ◽  
Libor Válka
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Empirical Formulas ◽  
Small Punch ◽  
Properties Of Materials ◽  
Non Destructive ◽  
Deflection Rate

Tests on miniature samples are increasingly used for the determination of mechanical properties of materials available in small volumes (non-destructive or semi-destructive approach). Small punch testing at constant deflection rate (SPT-CDR) of selected magnesium alloys and composites was performed at room temperature. Mechanical properties (yield strength, ultimate strength) were evaluated from SPT and correlated with results of uniaxial tensile tests (UTT). SPT characteristics were converted to uniaxial tensile properties by empirical formulas available in the literature. New formulas more appropriate for magnesium alloys were suggested.

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