글밭

What is differential. Math? Science? Is it a difficult story? Differentiation is generally considered to be a'difficult story'. It is often referred to as a typical concept far from everyday life. Even the math teacher said this. 'Is it useful to learn differentiation?' 'Would you like to solve the differential equation when calculating change in the supermarket?' It is the'differentiated useles..

유한요소법(FINITE ELEMENT METHOD)을 이용한 CAE과정에서 주어진 문제에 적합한 해석 소프트웨어 혹은 접근 방법의 두가지 선택 사항이 바로 EXPLICIT으로 해석할것이냐 IMPLICIT으로 해석할 것이냐이다. 둘다 접근 가능한 문제도 심심치 않게 있다. implicit finite element method는 내연적 유한요소법, explicit finite element method는 외연적 유한요소법이라고 한다. 둘의 차이점을 살펴보면 다음과 같다. 내연적 유한요소법의 가장 큰 특징은 반복계산에 있다(iteration). 이 과정은 구조해석 문제에서 풀게 되는 3가지 방정식 평형 방정식, 구성 방정식, 적합 방적식을 연립하여 해를 구하는 프로세스이다. 적당한 TIME STEP(시간증분..

Linear is... If there are 20 changes when you first try 10, It is a state where you can get 200 values with 100 efforts. So the linearity is predictable. 10 —> 20 100 —> 200 Nonlinear is... It is 20 when 10 efforts are made, It is a situation where even if you try as much as 100, 50 changes may occur, or 400 changes may occur. So non-linearity is difficult to predict. In the graph below, The lef..

The stress accumulated in the metal can be relieved through heat treatment. In a word, stress is relieved by heating. However, it is a recovery to the previous state. The stress is relieved, but the structure is already deformed. But what if you do more heating in this state? New things happen. Re-crystallization! A crystal structure, which can be said to be the basic unit constituting the metal..

In mechanical engineering, resistance to external forces is stress. The stress that is 'stacked' inside the material is called the residual stress. We often say "Oh! It's stressful." It's a very engineering expression to say. Eventually, the accumulated stress will exceed the level that can be sustained, and the material will break off. There is no way to avoid the accumulation of stress. It is ..

Deformation occurs when any material is applied to a load, and breakage occurs when the deformation is too large. Sometimes the fracture occurs at a much lower strength, even though the breaking strength that the material can endure is determined. It happens at very unpredictable timing. Such a load is called fatigue load. Such fracture is caused by fatigue. So fatigue is dangerous. This is beca..

All materials have their own areas of resistance. The strength at which the material breaks is called the breaking strength. And yield strength is the strength at which material destruction begins. Deformation due to loads less than the yield strength can be recovered. This ability to recover is called 'elasticity'. The best elastic material is rubber. It has good recovery ability. The material ..

Prediction of actual phenomena through a computer is called simulation. There are various simulation techniques and applications. In engineering, the finite element method is common. The finite element method calculates all objects by dividing them into smaller elements. Counting as infinite division is correct, but there are limits, so it is divided into finite elements. Even very complex shape..