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Point (BC) is the yield point on the graph and stress associated with this point is known as yield stress Ultimate Stress Point (D) Ultimate stress point is the maximum strength that material has to bear stress before breaking It can also be defined as the ultimate stress corresponding to the peak point on the stressstrain graph Breaking Stress Point or Fracture Point (E)Same goes with materials It can withstand the shear stress to strain linearly up to a certain point beyond which it will yield In other words, it will just begin to deform This is known as yield point in the stress strain diagram*Yield point is the point at which the material will have an appreciable elongation or yielding without any increase in load Ultimate Strength *The maximum ordinate in the stressstrain diagram is the ultimate strength or tensile strength Rapture Strength *Rapture strength is the strength of the material at rupture This is also known as the breaking strength Stress Strain Curve Wikipedia Stress