scholarly journals Cyclic Fatigue Behavior of Pressure-Less Sintered Silicon Nitride in Rotating Bending Test

1991 ◽  
Vol 99 (1150) ◽  
pp. 489-494 ◽  
Author(s):  
Toshio OGASAWARA ◽  
Yoshio AKIMUNE ◽  
Koji YONEDA
Keyword(s):  
Silicon Nitride ◽  
Fatigue Behavior ◽  
Cyclic Fatigue ◽  
Bending Test ◽  
Rotating Bending ◽  
Sintered Silicon

High Temperature Fatigue Properties of Silicon Nitride in Nitrogen Atmosphere

1992 ◽  
Vol 287 ◽  
Author(s):  
Yasuhiro Shigegaki ◽  
Takashi Inamura ◽  
Akihiko Suzuki ◽  
Tadashi Sasa
Keyword(s):  
Silicon Nitride ◽  
Fatigue Behavior ◽  
Cyclic Fatigue ◽  
Nitrogen Atmosphere ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Static Fatigue ◽  
Four Point Bending ◽  
Bending Mode ◽  
Sintered Silicon

ABSTRACTCyclic and static fatigue properties of pressure-less sintered silicon nitride were evaluated at 1000° C in air and in nitrogen using four-point bending mode. The data of cyclic fatigue tests or static fatigue tests and the morphology of the fractured surfaces in nitrogen were compared with those in air. The cyclic fatigue behavior was remarkably influenced by the atmosphere, while the static fatigue was less influenced. Crack healing effect due to the oxidation around the crack are thought to be the most probable mechanism to affect the cyclic fatigue rate in air.

scholarly journals Fatigue behavior of beech and pine wood modified with low molecular weight phenol-formaldehyde resin

Holzforschung ◽  
2021 ◽  
Vol 75 (1) ◽  
pp. 37-47 ◽  
Author(s):  
Jaka Gašper Pečnik ◽  
Andreja Kutnar ◽  
Holger Militz ◽  
Matthew Schwarzkopf ◽  
Hannes Schwager
Keyword(s):  
Molecular Weight ◽  
Fatigue Strength ◽  
Cyclic Loading ◽  
Phenol Formaldehyde ◽  
Fatigue Behavior ◽  
Cyclic Fatigue ◽  
Modulus Of Rupture ◽  
Bending Test ◽  
Low Molecular Weight ◽  
Modified Wood

AbstractModification of wood improves certain properties of natural wood and presents competitive alternatives to synthetic materials that may have larger environmental impacts. One aspect of modified wood that is currently not fully understood is the dynamic performance and how it is affected by the modification process. In this study, low-molecular weight phenol formaldehyde (PF) resin was applied to Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) wood. The effect of this modification was evaluated using a three-point bending test undergoing cyclic loading. Compared to reference samples, modified wood showed higher static performance but revealed a reduction in cyclic fatigue strength (9% for pine and 14% for beech). Cyclic fatigue strength of unmodified wood was found to be 67% of the static modulus of rupture for both species. With PF resin modification, the fatigue strength dropped to 58% for pine and 53% for beech. While fatigue strength decreased, there was no reduction in cyclic modulus or change in the creep rate within the stationary creep phase. It is important to consider the reduction in fatigue strength when using PF modified wood for any construction purposes with expected cyclic loading conditions.

Sign in / Sign up

Export Citation Format

Share Document