Non-destructive characterisation of microstructure evolution in Mg based metal matrix composites submitted to thermal cycling

1997 ◽  
Vol 234-236 ◽  
pp. 774-777 ◽  
Author(s):  
František Chmelik ◽  
Zuzana Trojanová ◽  
Jens Kiehn ◽  
Pavel Lukáč ◽  
Karl Ulrich Kainer
Keyword(s):  
Thermal Cycling ◽  
Metal Matrix Composites ◽  
Microstructure Evolution ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Non Destructive

Damage of Short-Fiber-Reinforced Metal Matrix Composites Considering Cooling and Thermal Cycling

1999 ◽  
Vol 122 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Chuwei Zhou ◽  
Wei Yang ◽  
Daining Fang
Keyword(s):  
Thermal Cycling ◽  
Metal Matrix Composites ◽  
Stress Drop ◽  
Metal Matrix ◽  
Failure Modes ◽  
Short Fiber ◽  
Uniaxial Tensile ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Matrix Damage

Mechanical properties and damage evolution of short-fiber-reinforced metal matrix composites (MMC) are studied under a micromechanics model accounting for the history of cooling and thermal cycling. A cohesive interface is formulated in conjunction with the Gurson-Tvergaard matrix damage model. Attention is focused on the residual stresses and damages by the thermal mismatch. Substantial stress drop in the uniaxial tensile response is found for a computational cell that experienced a cooling process. The stress drop is caused by debonding along the fiber ends. Subsequent thermal cycling lowers the debonding stress and the debonding strain. Micromechanics analysis reveals three failure modes. When the thermal histories are ignored, the cell fails by matrix damage outside the fiber ends. With the incorporation of cooling, the cell fails by fiber end debonding and the subsequent transverse matrix damage. When thermal cycling is also included, the cell fails by jagged debonding around the fiber tops followed by necking instability of matrix ligaments. [S0094-4289(00)01202-0]

S102 Residual Stresses in Metal Matrix Composites for Heat Sink Applications During Thermal Cycling

2008 ◽  
Vol 23 (2) ◽  
pp. 188-188
Author(s):  
M. Schöbel ◽  
H. P. Degischer ◽  
T. Buslaps ◽  
M. di Michiel ◽  
T. Poeste ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Thermal Cycling ◽  
Metal Matrix Composites ◽  
Heat Sink ◽  
Metal Matrix ◽  
Matrix Composites
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