Strain Measurement Using Digital Image Correlation Technique

Strain is a critical parameter within engineering and construction of projects. The objective of the paper is to investigate a material’s crack propagation and deformation. The automobile industry has an increasing demand for lightweight composite materials, improved product performance, efficiency and increased safety. Composites are also extensively used in aerospace and automotive applications due to their high specific stiffness and strength. It is critical to understand the influence of high strain rate on the mechanical behaviour of composite materials in order to develop durable composite structures. In this project, influence of high strain rate on the tensile strength, tensile modulus, and failure strain of any material is determined. Strain is a measure of the deformation of a body when subjected to an applied force. There are various methods for the measurement of strain, one of them is the UTM machine used for measuring the strain of any material, the other one is the traditional method-extensometer which only gives an average value of the strain. In order to overcome the problems faced by the older methods, the Digital image correlation technique is proposed. It is a novel optical approach for sensing strain and displacement that is non-contact. Digital Image Correlation is easier to use and less expensive than other techniques like speckle interferometry, and it is more precise and subjective than manual measuring methods, opening up a wide range of possible applications. Digital Image Correlation is applied in the developing systems to characterise the material and to monitor engineering components