Cyclic-Fatigue Behavior of SiC/SiC Composites at Room and High Temperatures

1996 ◽  
Vol 79 (12) ◽  
pp. 3065-3077 ◽  
Author(s):  
Mineo Mizuno ◽  
Shijie Zhu ◽  
Yasuo Nagano ◽  
Yoshihisa Sakaida ◽  
Yutaka Kagawa ◽  
...  
Keyword(s):  
High Temperatures ◽  
Fatigue Behavior ◽  
Cyclic Fatigue ◽  
Sic Composites

scholarly journals 0613 Study on Fatigue Behavior of Bi-Brass under Room to High Temperatures

2012 ◽  
Vol 2012.49 (0) ◽  
pp. 061301-061302
Author(s):  
Shinya YAMAMOTO ◽  
Sotomi ISHIHARA ◽  
Yoshiharu KOUSAKA ◽  
Takuya OKADA
Keyword(s):  
High Temperatures ◽  
Fatigue Behavior

Characterization of Boron Nitride Coated Silicon Carbide Fibers and Composites

1997 ◽  
Vol 3 (S2) ◽  
pp. 733-734
Author(s):  
Mani Gopal
Keyword(s):  
Silicon Carbide ◽  
Boron Nitride ◽  
High Temperatures ◽  
Specimen Preparation ◽  
Ion Milling ◽  
Sic Fibers ◽  
Silicon Carbide Fibers ◽  
Pull Out ◽  
Sic Composites

Silicon carbide (SiC) composites are receiving much attention for structural use at high temperatures. One class of composites are those reinforced with SiC fibers. The SiC fibers are coated with boron nitride (BN) which is weakly bonded to the fiber. During fracture, the coating deflects cracks causing pull-out of the fibers (Fig. 1). This process of fiber pull-out consumes energy and increases the toughness of the composite. Although much work has been done on characterizing these materials by SEM, not much has been done using TEM due to difficulties in specimen preparation. The purpose of this study is to characterize these fibers and composites using conventional and analytical TEM.In this study, TEM specimens were prepared by dimpling and ion milling. Careful control of the preparation was needed to ensure the integrity of the SiC-BN interface. Figure 2a is a TEM image of the fiber showing delamination at the SiC-BN interface.

scholarly journals Static Fatigue of SiC Multifilament Tows at Temperatures up to 1200 °C in Air

Ceramics ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 426-440 ◽  
Author(s):  
Jacques Lamon
Keyword(s):  
High Temperatures ◽  
Fatigue Behavior ◽  
Slow Crack Growth ◽  
Stress Rupture ◽  
Constant Load ◽  
Rupture Time ◽  
Static Fatigue ◽  
Probability Relation ◽  
Time Relation ◽  
Increasing Temperature

SiC-based fibers are sensitive to delayed failure under constant load at high temperatures in air. Static fatigue at intermediate temperatures < 800 °C was attributed to slow crack growth from flaws located at the surface of fibers, driven by the oxidation of free carbon at grain boundaries. The present paper examines the static fatigue behavior of SiC-based Hi-Nicalon fibers at high temperatures up to 1200 °C and Hi Nicalon S fibers at intermediate temperatures (500–800 °C). The degradation of stress- rupture time relation of multifilament tows with increasing temperature was investigated. Predictions of tow lifetime based on critical filament-based model of tow failure were compared to experimental stress-rupture time diagrams. Critical filaments are characterized by strength–probability relation. The critical filament-based model was found to describe satisfactorily the static fatigue behavior of fiber tows at these temperatures. The influence of various factors on lifetime as well as the origins of variability is analyzed.

Sign in / Sign up

Export Citation Format

Share Document