यदि K आयतन प्रत्यास्थता गुणांक, E प्रत्यास्थता गुणांक तथा प्वासों अनुपात \(\frac{1}{m}\) है, तो निम्न में से कौन सही है ?

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UKPSC JE Mechanical 2013 Official Paper I
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  1. \(\rm E=3K\left(1+\frac{2}{m}\right)\)
  2. \(\rm E=3K\left(1-\frac{1}{m}\right)\)
  3. \(\rm E=3K\left(1-\frac{2}{m}\right)\)
  4. \(\rm E=3K\left(1+\frac{1}{m}\right)\)

Answer (Detailed Solution Below)

Option 3 : \(\rm E=3K\left(1-\frac{2}{m}\right)\)
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स्पष्टीकरण:

यंग मापांक (E) और दृढ़ता मापांक (G) और प्वासों अनुपात(μ) के बीच संबंध निम्न द्वारा दिया जाता है

E = 2G (1 + μ)

कुछ अन्य महत्वपूर्ण संबंध इस प्रकार हैं:

E = 3K (1 - 2μ), 

\({\bf{E}} = \frac{{9{\bf{KG}}}}{{3{\bf{K}} + \;{\bf{G}}}}\)

Here, Poission ratio (μ) = \(\frac 1m\)

Therefore, \(E = 3K (1 – 2μ)​​=3K(1-\frac2m) \)

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