Tensile Creep and Creep Rupture Behavior of Monolithic and SiC-Whisker-Reinforced Silicon Nitride Ceramics

1993 ◽  
Vol 76 (12) ◽  
pp. 3105-3112 ◽  
Author(s):  
Tatsuki Ohji ◽  
Yukihiko Yamauchi
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Nitride Ceramics ◽  
Rupture Behavior

Tensile Creep and Creep Rupture Behavior of HIPED Silicon Nitride

1993 ◽  
Vol 89-91 ◽  
pp. 569-574 ◽  
Author(s):  
Tatsuki Ohji ◽  
Y. Yamauchi ◽  
Shuzo Kanzaki
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Rupture Behavior

Tensile Creep of Y-Si3N4: II. Cavitation

1991 ◽  
Vol 49 ◽  
pp. 972-973 ◽  
Author(s):  
B. J. Hockey ◽  
S. M. Wiederhorn
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Sintering Aids ◽  
Microstructural Changes

ATEM has been used to characterize three different silicon nitride materials after tensile creep in air at 1200 to 1400° C. In Part I, the microstructures and microstructural changes that occur during testing were described, and consistent with that description the designations and sintering aids for these materials were: W/YAS, a SiC whisker reinforced Si3N4 processed with yttria (6w/o) and alumina (1.5w/o); YAS, Si3N4 processed with yttria (6 w/o) and alumina (1.5w/o); and YS, Si3N4 processed with yttria (4.0 w/o). This paper, Part II, addresses the interfacial cavitation processes that occur in these materials and which are ultimately responsible for creep rupture.

Tensile Creep Behavior in Lutetia-doped Silicon Nitride Ceramics

2005 ◽  
Vol 20 (8) ◽  
pp. 2213-2217 ◽  
Author(s):  
Toshiyuki Nishimura ◽  
Naoto Hirosaki ◽  
Yoshinobu Yamamoto ◽  
Yorinobu Takigawa ◽  
Jian-Wu Cao
Keyword(s):  
Silicon Nitride ◽  
Strain Rate ◽  
Applied Stress ◽  
Creep Behavior ◽  
Stress Rupture ◽  
Tensile Creep ◽  
Time To Failure ◽  
Transmission Electron ◽  
Nitride Ceramics ◽  
Minimum Strain Rate

We studied tensile creep behavior in two silicon nitride ceramics, i.e., 4.8 mol% Lu2O3 (SN48) and 1.2 mol% Lu2O3 (SN12), at 1400–1500 °C under applied stress of 137–300 MPa. Time to failure of SN48 increased with decreasing applied stress and minimum strain rate. The stress–rupture parameter was 10.7 at 1400 °C and 11.4 at 1500 °C. Pore formation was confirmed in a creep-tested specimen of SN48 by transmission electron microscopy. These results suggest that SN48 was fractured by creep rupture. The minimum strain rate of SN12 was almost below the measurement system limitation at temperatures below 1500 °C. Time to failure tended to increase with decreasing applied stress. The stress–rupture parameter was 41 at 1400 °C and 73 at 1500 °C. These results suggest that SN12 was fractured by subcritical crack growth.

Evaluating and Modeling of Tensile Creep Rupture Behavior for Neat and Reinforced Polyamide 6.6

2020 ◽  
Vol 1002 ◽  
pp. 95-103
Author(s):  
Orhan Sabah Abdullah ◽  
Shaker S. Hassan ◽  
Ahmed N. Al-Khazraji
Keyword(s):  
Power Law ◽  
Creep Deformation ◽  
Creep Rupture ◽  
Experimental Results ◽  
Tensile Creep ◽  
Power Law Model ◽  
Thermoplastic Polymers ◽  
Polyamide 6.6 ◽  
Applied Stresses ◽  
Rupture Behavior

Generally, thermoplastic polymers due to their viscoelastic behavior tend to appear creep deformation at low temperature compared to metals; this continuous creep deformation caused irregular shapes with time and resultant unstable dimensional parts. Therefore, the investigation of creep behavior in thermoplastic polymers must be considered as an essential requirement in the design process. This work exanimated the creep rupture behavior for Polyamide 6.6 and their composites which content of 1%MWCNTS or 30 short carbon fibers under variant applied stresses and temperatures, as well as, to create analytical model to the obtained results Findley power law model was employed for this purpose with a comprehensive verification to their compatibility to the experimental results. The results appeared that the addition of reinforced materials and decreasing applied stresses and temperatures will cause an enhancement in creep resistance by increasing rupture time and decreasing the minimum creep rate values. On the other hand, using of Findley power law model gives a good agreement to the obtained experimental results.

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