hi, please help me solve this:A composite bar is 350mm long and consists of a copper tube butt-welded to the end of a steel bar. The copper tube dimensions are: 30mm dia x 10mm bore dia x 200mm long, and the steel bar is 30mm dia x 150mm long. If the composite bar supports an axial force of 4kN, determine:a)the stresses in the steel and copperb)the change in length of the composite bar (Esteel 200GN/m2, Ecopper 120GN/m2)It‘s so confusingthanks!!!!!!!!!
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a) Stress in copper force /area 4000 ? 4 ? 10^6/[π.(30?-10?)] 6.366 ? 10^6 N/m? Stress in steel 4000 ? 4 ? 10^6/[π ? 30?] 5.659 ? 10^6 N/m? b) change in length ?L stress ? original length / E For copper ?Lc 6.366 ? 10^6 ? 0.2 / (120 ? 10^9) 10.610 ? 10^-6 m For steel ?Ls 5.659 ? 10^6 ? 0.15/(200 ? 10^9) 4.244 ? 10^-6 m Total change in length 10.610 + 4.244 14.85 μm.
