Question

Calculate the apparent longitudinal stress when Do=162mm, D=140mm, Pmax=3MPa.

(a) 8.85N/mm^2

(b) 9.32N/mm^2

(c) 6.66N/mm^2

(d) 7.65N/mm^2

The question was asked in semester exam.

The doubt is from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Answer 1

The correct answer is (a) 8.85N/mm^2

The best I can explain: σI=\(\frac{P_{max}D^2}{Do^2-D^2}\)

                          =\(\frac{3×140^2}{(162^2×140^2)}\)

                          =8.85N/mm^2