Elastic deformation only occurs in a material when stresses are lower than a critical stress called the yield strength. This is called elastic deformation, because like elastic it returns to its unstressed state. If the stress is small, the material may only strain a small amount and the material will return to its original size after the stress is released.

As in the case of stress, the strain distribution may or may not be uniform in a complex structural element, depending on the nature of the loading condition. For example, the strain in a bar that is being stretched in tension is the amount of elongation or change in length divided by its original length. This results in a unitless number, although it is often left in the unsimplified form, such as inches per inch or meters per meter. Engineering strain is defined as the amount of deformation in the direction of the applied force divided by the initial length of the material. When a material is loaded with a force, it produces a stress, which then causes a material to deform. Strain is the response of a system to an applied stress. As each plane has three stresses, the stress tensor has nine stress components, which completely describe the state of stress at a point. Fortunately, it can be proven that the stresses on any plane can be computed from the stresses on three orthogonal planes passing through the point.

Since stresses are defined in relation to the plane that passes through the point under consideration, and the number of such planes is infinite, there appear an infinite set of stresses at a point. These stresses are average stresses as the area is finite, but when the area is allowed to approach zero, the stresses become stresses at a point. The normal force component divided by the area gives the normal stress (Пѓ), and parallel force components divided by the area give the shear stress (П„). The internal force acting on a small area of a plane can be resolved into three components: one normal to the plane and two parallel to the plane. It must be noted that the stresses in most 2-D or 3-D solids are actually more complex and need be defined more methodically.

Some common measurements of stress are: Psi = lbs/in 2 (pounds per square inch) ksi or kpsi = kilopounds/in 2 (one thousand or 10 3 pounds per square inch) Pa = N/m 2 (Pascals or Newtons per square meter) kPa = Kilopascals (one thousand or 10 3 Newtons per square meter) GPa = Gigapascals (one million or 10 6 Newtons per square meter) *Any metric prefix can be added in front of psi or Pa to indicate the multiplication factor For example, the stress in an axially loaded bar is simply equal to the applied force divided by the bar's cross-sectional area. The word 'vector' typically refers to a quantity that has a 'magnitude' and a 'direction'. Simplifying assumptions are often used to represent stress as a vector quantity for many engineering calculations and for material property determination. However, a bar loaded in bending will have a stress distribution that changes with distance perpendicular to the normal axis. For example, a bar loaded in pure tension will essentially have a uniform tensile stress distribution. The stress distribution may or may not be uniform, depending on the nature of the loading condition. From the perspective of what is happening within a material, stress is the internal distribution of forces within a body that balance and react to the loads applied to it. From the perspective of loading, stress is the applied force or system of forces that tends to deform a body. The term stress (Пѓ) is used to express the loading in terms of force applied to a certain cross-sectional area of an object. Stress and Strain Stress and Strain Stress

Engineering stress vs true stress pdf