ISRO Mechanical & Aerospace 2018 - Question 76

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Topic: Strength of Materials

The relationship between the linear elastic properties Young's Modulus (E), rigidity modulus (G) and Bulk modulus (K) is given by

  • A. 9/E = 3/K + 1/G
  • B. 1/E = 9/K + 3/G
  • C. 3/E = 9/K + 1/G
  • D. 9/E = 1/K + 3/G

Answer: D. 9/E = 1/K + 3/G

Explanation: We know E = (9KG) / (3K + G). Inverting gives 9/E = (3K + G) / KG = 3/G + 1/K.

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