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Elastic Limit and Yield Point may convey the same state of material that is but the latter is used for an engineering convenience Elastic limit is a value of stress upto which material can be deformed elastically under load, after unloading it w2 n Drilling Fluids A parameter of the Bingham plastic modelYP is the yield stress extrapolated to a shear rate of zero (Plastic viscosity, PV, is the other parameter of the Binghamplastic model)A Bingham plastic fluid plots as a straight line on a shear rate (xaxis) versus shear stress (yaxis) plot, in which YP is the zeroshearrate interceptSteel Figure 7 Stress vs strain for Steel sample Calculations Everything has to be labeled in the graph 1 Young's Modulus y2=130, y1=40MPa, x2= 0006, x1= 0003 E=(y2y1)/(x2x1)=MPa = 30GPa 2 Yield Stress Upper and Lower Yield point OR offset method =5MPa 3 Mechanical Properties Of Materials Mechanicalc Yield point and yield strength definition