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Composite Bars (Parts in Series)
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A stepped bar ABCD has the following dimension
Portion AB: Length 1200 mm and diameter 40 mm
Portion BC: Length 800 mm and diameter 20 mm
Portion CD: Length 1000 mm and diameter 30 mm
It is subjected to four point loads as shown in fig. Find the value of P for the equilibrium and then find the change in length of bar. Assume E=200 Gpa
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