[재료부문] STS316L과 P92강의 고온 피로 균열 성장에 미치는 하중 파형의 영향 = The Effect Loading Waveform on the High Temperature Fatigue Crack Propagation Property in STS 316L and P92 Steel

다국어 초록 (Multilingual Abstract)

The high temperature fatigue crack growth behavior of STS 316L and P92 steel were investigated under four load conditions using CT type specimens. The loading and unloading times for the four wave forms were combinations of 1 sec. and 50 sec., which were two symmetric wave forms and two un symmetric wave forms. Its behavior is characterized using the ?? K parameter.<br/>
The crack growth rate generally increases as the frequency decreases. However, sensitivity of the loading rate for the crack growth rate is far greater than that of the unloading time. It is because as the loading time is increased, creep occurs at the crack tip causing the crack growth rate to increase but creep does not occur at the crack tip even if the unloading time is increased. Also by investigating the changes of C and m values in the Paris law for each wave form, the stress level sensitivity during fracturing process and the crack growth behavior are investigated.<br/>
After comparing the high temperature fatigue crack growth rates under various wave forms. it is proved that the P92 steel is not only economical with good thermal properties but also has the improved high temperature fatigue crack growth rate is improved compared to the existing high temperature material, STS316L<br/>

목차 (Table of Contents)

• ABSTRACT
  
• 1.서론
  
• 2.실험방법
  
• 3.실험결과
  
• 4.결론
  
• 후기
  
• 참고문헌