2.7 Shrinkage
- Theoretical value: (a=35, : Maximum Shrinkage Strain Ratio)
- The process of finding 'a'
1. Arranging excel data
2. Finding 'a' with using a grapher program
(Converting Excel data into graph shape)
(Standardization of graph through regression analysis)-회귀분석을 통한 그래프 평균화
(Finding 'a' with using shrinkage equation)
3. Finding 'a'
Tensile Strength
Indicated by the maxima of a stress-strain curve and,
in general, indicates when necking will occur.
Tensile strength obtained from tests of the double
axial loads P notation refers to the value
calculated by dividing .
ShearStrength
-An intersecting point of th
strength, UTS)까지 힘을 받지 않아도 파괴되어 버리는 Fatigue 현상이 있다.
<그림 1> Mechanical Bonding Test1. Mechanical Bonding Test
기계적 강도 측정법(Mechanical Bonding Test)에는 크게 두 가지가 있는데 <그림 2>와 같이 Shear Test와 Pull Test가 있다. 현재 가장 흔히 쓰이는 방법은 Shear Test로 Solder를 PCB 기판에 접합 후
in the range of theory, and the value from the second experiment is 0.16 which also comes under the range of theory. In case of specimen no.1, there was an error of 12.6% but the Poisson's ratio is highly appropriate. From this, we can analogize the Poisson's ratio has nothing to do with strength, but is related to the materials.
4. Shear Modulus of Elasticity
‣ Theoretical Value