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Circumferential and longitudinal direction of valve experience which stress?(a) Shear stress(b) Principal stress(c) Longitudinal cyclic stress(d) Thermal stressThe question was posed to me by my school principal while I was bunking the class.The query is from Poppet Valves topic in section Valve Timing Technologies of Automotive Engine Design

Answer»

Correct choice is (d) Thermal stress

The BEST I can explain: Thermal stresses in the circumferential and LONGITUDINAL directions DUE to the large temperature gradient from the CENTRE of the head to its periphery and from the crown to the stem.



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