Fatigue Failure Process
균열발생 단계(Crack-Initiation Stage)
공업재료는 연성이며 제조한 상태대로는 균열이 존재하지 않지만, 일반적으로는 입자, 함유물 등을 포함하고 있다고 가정한다. 미시적 크기에서 금속은 균질하지도 않고 등방성도 아니다. 또한 기하학적으로 응력집중(노치)이 되는 부분이 있다
Fracture
Static Loading
Brittle, Ductile, Creep Rupture
Fatigue(Dynamic Loading)
A degradation of mechanical properties leading to failure
of a material or a component under cyclic loading
High/Low cycle, Fatigue crack growth
Classification of failures according to cause
77% of failures are
generally caused
directly or indirectly
by fatigue
Process of fatigue fracture
The
failure or operation error could lead to serious result. It will pollute soil and plants and do harm to humans and animals.
In my eyes, we should continue the exploration of nuclear power. Not only does it bring lots of profits but also it is the best choice we have. Compared with other energies like sunshine, wind, and garbage, it is best to solve the shortage of coal and natural gas. As you kn
turbine engines.
JHP is aware of the benefits of analytics. The company outsourced several analytics companies to conduct a few of operations research to optimize the amount of raw material use and to increase production. JHP did not incorporate an analytics department in its business and maintained outsourcing strategy up until now.
The Problem
The leadership of JHP realized a major change must
turbine의 진동 특성 때문에 clearance가 어느 정도 필요할 수 밖에 없다. 이러한 단점을 보완하기 위해, brush같은 구조물을 축과 직접 접촉시킴으로써 clearance를 최대한 줄이는 brush seal이 개발되었다. Clearance가 줄어들기 때문에 labyrinth seal보다 탁월한 성능을 보인다. 그림 3-4에서와 같이 brush 의 솔이 직접 rot