modulus. The first one is called the 'static method' that isthe way to measure the deformation strain that are corresponded to applied force using the strain gage. In other way, 'kinetic method' can measure theYoung's modulus using 'sonic resonance test' and 'pulse echo overlap.' In sonic resonance test, sonic wave or impulse are applied tothe specimen for finding the resonance frequency of t
the microcantilever must be previously biofunctionalized and thiscan be a complex task especially when arrays of microcantilevers are employed.
In contrast tothe static case, the dynamic mode does not require the functionalization of only one cantilever surface, as thecantilever resonance frequency change depends on thetotal mass adsorbed on both sides. In this mode, the microcantilever is
test specimen. Couplant is generally necessary because the acoustic impedance mismatch between air and solids (i.e. such as thetest specimen) is large. Therefore, nearly all ofthe energy is reflected and very little is transmitted intothetest material. The couplant displaces the air and makes it possible to get more sound energy intothetest specimen so that a usable ultrasonic signal can be
Test를 위해 Mechanical Bonding Test를 실시하여 Sn-Pb Solder와 Pb-Free Solder 간의 차이를 확인하고 Pb-Free Solder중에서도 각 재료마다의 Mechanical Bonding Test를 실시하여 Bonding Force를 체크한다. 보통 Soldering 된 제품이 받는 Stress 는 Tensile Stress 보다는 Shear Stress 가 주요하기 때문에 Solder 선택 시에는 Solder의 Tensile Property