Tensile Stress-Strain Curve
Tensile stress-strain curves graphically illustrate transitional points in a resin’s stress-strain behavior (see figure below). Point A, the proportional limit for the material, shows the end of the region in which the resin exhibits linear stress-strain behavior. Point B is the material’s elastic limit or the point after which the part will be permanently deformed even after the load is removed.
Applications that cannot tolerate any permanent deformation must stay below the elastic limit. Point C, the yield point, marks the beginning of the region in which ductile plastic continues to deform without a corresponding increase in stress. Elongation at yield gives the upper limit for applications that can tolerate the small permanent deformations that occur between the elastic limit and yield point, but not the larger deformations occuring during yield. Point D, the break point, shows the strain value at which the test bar breaks. These four transitional points, important in plastic part design, are the basis for several common tensile properties (click for larger image).
Stress-Strain Curves for Bayblend ET1000 for different temperatures (click for larger image).
