3D Mohr's Circle is used to visualize and calculate the state of strain on various planes in three-dimensional space. It is particularly useful in several fields: Civil engineering: Aids in analyzing soil structures or other building materials, helping to predict their response under complex loading scenarios. Mechanical engineering: Used to understand the deformation characteristics of materials and predict their failure modes. Aerospace engineering: Valuable for studying stress-strain behavior in aircraft structures subjected to multi-axial stresses. Automobile industry, naval architecture, and bridge design: Assists in ensuring structural integrity and safety. 3D Mohr's Circle helps in determining the maximum and minimum principal stresses, as well as the maximum shear stress, which are crucial for material strength analysis and structural integrity studies.