A state of plane stress (σ3=0) occurs at a critical point of a mild steel machine component (see Figure 1 below). As a result of several tension tests, it has been found that the tensile yield strength is = 250MPa for the grade of steel used. (a) Determine the factor of safety (FS) with respect to yield using (i) the maximum shear stress criterion and (ii) the maximum distortion energy (von Mises) criterion. (b) Graph the Tresca Hexagon and the von Mises oval for this material and note the location of the given state of plane stress as a point on the graph

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Material Properties

Construction in civil engineering demands high strength, durability, and longevity. These targets can be achieved by better design and analysis, along with the correct choice of materials. Different materials have different properties and hence, they respond and performs differently under the various condition of external loadings. It is therefore a critical task of an engineer to select the right material based on the property that the material is supposed to function in real-time. When speaking about the property, there are different categories of material properties like chemical property, physical property, mechanical property, electrical property, magnetic property, thermal property, etc. These material properties form the basis of material selection in various applications.