Give note on , with calculations if there's any Stress/strain Tensile/compressive stress Modulus of elasticity Poisson ratio Composite materials

Here are notes on the requested concepts: 1. Stress/Strain Stress () is the internal force per unit area that a material experiences in response to an external load. It is a measure of the intensity of internal forces acting within a deformable body. = (F)/(A) where F is the applied force and A is the cross-sectional area. The SI unit for stress is Pascals (Pa), or N/m^2. Strain () is the deformation of a material in response to stress, expressed as the ratio of change in dimension to the original dimension. It is a dimensionless quantity. = ( L)/(L_0) where L is the change in length and L_0 is the original length. 2. Tensile/Compressive Stress Tensile stress occurs when a material is subjected to forces that pull it apart, causing elongation. The stress acts perpendicular to the cross-section and points outwards. Compressive stress occurs when a material is subjected to forces that push it together, causing shortening. The stress acts perpendicular to the cross-section and points inwards. Both tensile and compressive stress are types of normal stress*. 3. Modulus of Elasticity (Young's Modulus) The Modulus of Elasticity (E), also known as Young's Modulus, is a measure of a material's stiffness or resistance to elastic deformation under load. It is defined as the ratio of stress to strain in the elastic region of a material's stress-strain curve. E = ()/() The SI unit for the Modulus of Elasticity is Pascals (Pa), or N/m^2. A higher modulus indicates a stiffer material. 4. Poisson's Ratio Poisson's ratio () is a material property that describes the ratio of transverse (lateral) strain to axial (longitudinal) strain when a material is stretched or compressed. When a material is stretched in one direction, it tends to contract in the perpendicular directions. = -_lateral_axial The negative sign indicates that a positive axial strain (stretching) results in a negative lateral strain (contraction). Poisson's ratio is a dimensionless quantity, typically ranging from 0 to 0.5 for most engineering materials. 5. Composite Materials Composite materials are engineered materials made from two or more constituent materials with significantly different physical or chemical properties that remain separate and distinct at the macroscopic or microscopic level within the finished structure. They are designed to achieve properties superior to those of the individual components. Common examples include fiber-reinforced polymers (like fiberglass or carbon fiber composites) and concrete (cement, aggregate, and water). The overall properties of a composite, such as its modulus of elasticity, can often be estimated using rules of mixtures based on the properties and volume fractions of its constituent phases. That's 2 down. 3 left today — send the next one.