What is modulus?
The modulus of a material indicates its resistance to deformation and describes its stiffness. When a tensile force is applied to a cured adhesive, the sample will undergo elongation/deformation (strain) by stretching. The ratio of stress (force/area) to strain (measure of extension) when a tensile force is applied to a cured adhesive is called the tensile modulus. A high tensile modulus (storage modulus) indicates high resistance to deformation, and a low tensile modulus indicates ease of deformation. The ratio of stress to elastic strain is called Young’s modulus or modulus of elasticity. Elastic elongation/strain is the percent elongation without permanently deforming the sample. Tensile modulus has an analog in the shear mode called shear modulus. The ratio of shear stress to shear strain when a shearing force is applied to a cured adhesive is called the shear modulus.
