Time‐Dependent Tensile Behavior of Ceramic‐Matrix Composites

2021 ◽  
pp. 145-185
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Tensile Behavior ◽  
Time Dependent ◽  
Matrix Composites

scholarly journals Effect of porosity on the nonlinear and time-dependent behavior of Ceramic Matrix Composites

2020 ◽  
Vol 184 ◽  
pp. 107658 ◽  
Author(s):  
Unni Santhosh ◽  
Jalees Ahmad ◽  
Greg Ojard ◽  
Imelda Smyth ◽  
Yasser Gowayed ◽  
...  
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Time Dependent ◽  
Matrix Composites ◽  
Dependent Behavior

Tensile Behavior of 2.5D C/SiCN Composites

2012 ◽  
Vol 217-219 ◽  
pp. 67-70
Author(s):  
Yi Xia ◽  
Hong Fang Li
Keyword(s):  
Tensile Stress ◽  
Room Temperature ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Tensile Behavior ◽  
Matrix Composites ◽  
Stress Growth ◽  
C Fiber ◽  
Cracks Propagation ◽  
Thermal Stress Relaxation

Tensile behavior of C fiber reinforced amorphous SiCN ceramic matrix composites (C/SiCN ) were investigated by tensile machine. The microstructure morphologies were observed by scanning electron microscope. The results indicate that the tensile stress-strain curves of C/SiCN composites dispaly typical elastic deformation and cracks propagation stages. The 1500°C pre-sabilization treatment of C/SiCN in vacuum facilitates room temperature tensile stress growth. The higher treated temperature such as 1900°C is yet opposite. The reasons were attributed to thermal stress relaxation of C/SiCN after pre-stabilization treatment in vacuum.

scholarly journals Time and Cycle Dependence in High Temperature Fatigue of Ceramic Matrix Composites

1996 ◽  
Author(s):  
Marc Steen ◽  
José-Lorenzo Vallés
Keyword(s):  
High Temperature ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Fatigue Behaviour ◽  
Time Dependent ◽  
Matrix Composites ◽  
Fibre Failure ◽  
High Temperature Fatigue ◽  
Stress Ratios ◽  
Cyclic Damage

The high temperature fatigue behaviour of two 2D reinforced ceramic matrix composites (CMCs) Is studied under high vacuum conditions. The mechanical loads imposed result in matrix cracking upon first loading, so that continued cyclic loading results in progressive interfacial debonding and/or matrix crack multiplication, as well as fibre failure. In order to investigate whether the fatigue life is mainly governed by time-dependent creep or by cyclically induced fatigue damage, a range of frequencies and two stress ratios are explored in stress controlled fatigue tests. The results obtained indicate that under pulsating fatigue (positive stress ratios or tension-tension) the material response is affected by both creep and fatigue mechanisms. The cyclic damage component gains in relative importance with increasing test frequency. Under reversed loading conditions (negative stress ratios), and depending on the creep strength mismatch between the fibres and the matrix, the time-dependent damage component can be largely suppressed, and the composite fatigue behaviour can become close to purely cycle-dependent. In both cases and for both composites fatigue failure is triggered by fibre failure.

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