高温中におけるSiC繊維強化SiC複合材料のクリープ変形挙動

抄録

This study examined the effect of microcrack propagation on the creep deformation behavior of a 3D-woven SiC fiber/BN interface/SiC matrix (SiC/SiC) composite under constant tensile loading. The transverse crack propagation in transverse (90°) layers was observed using the digital image correlation (DIC) method under monotonic tensile load at room temperature. Creep testing was conducted under constant tensile loading at 1200°C temperature in vacuum. The transverse crack corresponded to degradation of the elastic modulus during the creep testing. As results, the specimens exhibited non-linear viscoelastic behavior at higher stress than proportional limit stress (80 MPa). In addition, the degradation of elastic modulus was not observed during the creep testing, indicating that the non-linear viscoelastic behavior depends on the transverse crack propagation.