Figure 1 shows a steel bar AB that has a rectangular cross-section. If it is pin connected at its ends, determine the maximum allowable intensity w of the distributed load that can be applied to BC without causing bar AB to buckle. Use a factor of safety with respect to buckling of 2.5. E = 200 GPa, ơy = 360 MPa. Q1 w kN/m 5 m. 3 m 30 mm Section A-A iy + 20mm 20 mm Section A-A Figure 1

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Q: y P b 1500 N 240 mm 300 N 30° 120 mm 1000 N

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Properties of materials

A property of a material describes its characteristics and distinguishes it from the others. The material properties are described it in terms of its hardness, color, appearances, and so on. The material properties generally depend on the type of material, or whether it is a metal or an alloy. There are different kinds of material properties such as mechanical properties, thermal properties, physical properties, and chemical properties. Chemical properties describe the material in terms of a chemical change. The mechanical properties come into existence when the material is acted upon by an external load. Thermal properties are associated with the temperature of the material and specific heat.