The rigid bar AD is pinned at A and attached to the bars BC and ED, as shown below. The entire system is initially stress free and the weights of all bars are negligible. The temperature of bar BC is lowered 25°C and that of the bar ED is raised 25°C. Neglecting any possibility of lateral buckling, find the normal stresses in bars BC and ED. For BC, which is brass, assume E = 90GPa, a = 20x 10-6/°C, and for ED, which is steel, take E = 200 GPa and a = 12x10-6/°C.

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Dependence on mechanical properties

The mechanical properties of materials are those structures that include the reaction to the load used. Metal switching features determine the scope of the usefulness of the content and establish the expected service life. Machine structures are also used to help distinguish and identify material objects. The most common mechanical properties considered are strength, ductility, stiffness, impact resistance, and resilience to fractures.