KOSEN 한인과학기술자네트워크

>Gel의 Young's modulus 를 측정하고 싶습니다. >modulus는 대략 1 MPa 이하일 것으로 예상하고 있습니다. >기존의 micro/nano indenter로 측정이 가능한지 >가능하다면 측정할 수 있는 센터등을 알고 싶습니다. >만약 가능하지 않다면 다른 방법으로는 어떤 것이 있는지 알고 싶습니다. > >감사합니다. Young's modulus 는 보통 고체시료의 tensile 테스트를 통해 얻는 stress-strain 커브의 기울기 입니다. 젤 같은 경우 tensile 테스트를 하기가 쉽지 않을 것 같습니다. 대신에 shear modulus는 rheometer를 통해 shear stress-shear strain의 기울기를 통해 얻을 수 있습니다. (온도조절하면서)(젤은 고체 성질과 액체 성질(viscous)을 모두 같고 있습니다.) wikipedia 에서 나온 내용 In solid mechanics, Young's modulus (E) is a measure of the stiffness of an isotropic elastic material. It is also known as the Young modulus, modulus of elasticity, elastic modulus (though Young's modulus is actually one of several elastic moduli such as the bulk modulus and the shear modulus) or tensile modulus. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range of stress in which Hooke's Law holds.[1] This can be experimentally determined from the slope of a stress-strain curve created during tensile tests conducted on a sample of the material. Young's modulus (E) describes tensile elasticity, or the tendency of an object to deform along an axis when opposing forces are applied along that axis; it is defined as the ratio of tensile stress to tensile strain. It is often referred to simply as the elastic modulus. The shear modulus or modulus of rigidity (G or ) describes an object's tendency to shear (the deformation of shape at constant volume) when acted upon by opposing forces; it is defined as shear stress over shear strain. The shear modulus is part of the derivation of viscosity. The bulk modulus (K) describes volumetric elasticity, or the tendency of an object's volume to deform when under pressure; it is defined as volumetric stress over volumetric strain, and is the inverse of compressibility. The bulk modulus is an extension of Young's modulus to three dimensions.