Stress Strain Graph
A stress-strain graph illustrates the relationship between stress (force per unit area) and strain (deformation) in a material. Initially, as stress is applied, the material undergoes elastic deformation, where it can return to its original shape after the stress is removed. This is represented by the linear elastic region on the graph.
Beyond the elastic limit, the material enters the plastic deformation phase, where it undergoes permanent deformation. The stress continues to increase, but the strain increases at a slower rate. Eventually, the material reaches its ultimate strength, after which it starts to weaken due to necking or other mechanisms.
Finally, the material fractures at the point of failure. The graph can show different behaviors based on the material type: ductile materials tend to exhibit more elongation before breaking, while brittle materials break with limited plastic deformation. The shape of the graph can provide insights into a material's mechanical properties and behavior under stress.
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