Question

Calculate the thickness of the piston head by strength criteria, given D=250mm, Pmax=3MPa, σb= 43N/mm^2.

(a) 23.92mm

(b) 32.85mm

(c) 43.3mm

(d) 28.593mm

This question was posed to me at a job interview.

Query is from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Answer 1

Right answer is (d) 28.593mm

The best explanation: th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\)

                          =250\(\sqrt{\frac{3}{16}\frac{3}{43}}\)

                          = 28.593mm