एक खंड का प्लास्टिक मापांक 5 × 10-4 m3 है। इसका आकृति गुणक 1.2 है और प्लास्टिक आघूर्ण क्षमता 120 kNm है, सामग्री के पराभव प्रतिबल का मूल्य क्या है?

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HPPSC AE Civil 2015 (MPP-PPCL) Official Paper
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  1. 100 N/mm2
  2. 200 N/mm2
  3. 240 N/mm2
  4. 288 N/mm2

Answer (Detailed Solution Below)

Option 3 : 240 N/mm2

Detailed Solution

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अवधारणा:

आकृति गुणक: इसे प्रत्यास्थ खंड की तुलना में प्लास्टिक खंड की आघूर्ण वाहन की क्षमता के अनुपात के रूप में परिभाषित किया जाता है, जब पराभव शुरू होता है।

\(\text{Shape Factor} = \frac{{{Z_P}{\sigma _y}}}{{{Z_e}{\sigma _y}}} = \frac{{{M_P}}}{{{M_y}}} = \frac{{{Z_P}}}{{{Z_e}}}\)

विभिन्न वर्गों के लिए आकृति गुणक मान:

आकृति गुणक

खंड

1.5

आयताकार

1.7

वृत्ताकार

2.34

त्रिभुजाकार

 

गणना:

खंड का प्लास्टिक मापांक ZP = 5 × 10-4 m3

SF = 1.2

प्लास्टिक आघूर्ण क्षमता MP = 120 kNm

प्लास्टिक आघूर्ण क्षमता को निम्न द्वारा दिया जाता है,

\({M_P} = {Z_P}{\sigma _y}\)

पराभव प्रतिबल निम्न द्वारा दिया जाता है,

\({\sigma _y} = \frac{{{M_P}}}{{{Z_P}}} = \frac{{120\ \times\ 1000}}{{5\ \times\ {{10}^{ - 4}}}} = 240 \times {10^6}\;N/{m^2} = 240\;MPa\)

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