Aircraft Operating life and Durability
                                    Laboratory Work น3
                THE EFFECT OF RADIAL TIGHTNESS ON THE DURABILITY OF THE STRIP 
			         WITH HOLES FILLED WITH BUSHINGS, BOLTS AND RIVETS

          Student:         Group: 
        Variant: 
        Individual tasks:
         Sigma_0=184ฬฯเ 
         Sigma_0=130ฬฯเ 
             The results of the calculation of the durability of plates with holes
             and holes filled with bushings from steel 30HGSA 
        |———————————————————————————————————————————————————————————————————————————————|
        |Sample    |Material|B/d   |Tightness|   Durability of plate at stress levels   |
        |          |        |or    |         |         Sigma_maxgr, ฬPเ                 |
        |          |        |do, mm|         |——————————————————————————————————————————|
        |          |        |      |         |         184         |        130         |
        |          |        |      |         |——————————————————————————————————————————|
        |          |        |      |         |   N,cycles|   LgN   |  N,cycles|   LgN   |
        |——————————|————————|——————|—————————|———————————|—————————|——————————|—————————|
        |hole        ฤ16๗า     4        -         16100     4.2068      48500    4.6857 |
        |hole       ย95๏๗า1    4        -         12800     4.1072      25100    4.3997 |
        |bushing     ฤ16๗า     12    1 ฑ 0.2      58600     4.7679     281400    5.4493 |
        |bushing    ย95๏๗า1    12    1 ฑ 0.2      21300     4.3284      58600    4.7679 |
        |———————————————————————————————————————————————————————————————————————————————|
        |—————————————————————|
        |         90          |
        |—————————————————————|
        |   N,cycles|   LgN   |
        |———————————|—————————|
        |  155800     5.1926  |
        |   51300     4.7101  |
        | 1479300     6.1701  |
        |  171300     5.2338  |
        |—————————————————————|
             The results of the calculation of the durability of plates from ฤ16ภา
			 with holes and holes filled with  bolts ฮัา1 34103-80
        |————————————————————————————————————————————————————————————————————|
        |Tightness|Tightening     |   Durability of plate at stress levels   |
        |         |moment         |        Sigma_maxgr, ฬPa                  |
        |         |               |——————————————————————————————————————————|
        |   %     |               |         184         |        130         |
        |         |dเอ m          |——————————————————————————————————————————|
        |         |               |   N,cycles|   LgN   |  N,cycles|   LgN   |
        |———————— |———————————————|———————————|—————————|——————————|—————————|
        |    -           -             15900     4.2014      55200    4.7419 |
        |    -          3.0           114900     5.0603     282400    5.4509 |
        |   1.5         3.0           128500     5.1089     324200    5.5108 |
        |   1.5          -            120600     5.0813     469000    5.6712 |
        |————————————————————————————————————————————————————————————————————|
        |—————————————————————|
        |         90          |
        |—————————————————————|
        |   N,cycles|   LgN   |
        |———————————|—————————|
        |  205400     5.3126  |
        |  731600     5.8643  |
        |  863100     5.9361  |
        | 1974400     6.2954  |
        |—————————————————————|


















             The results of the calculation of the durability of plates from ฤ16ภา
             with holes and holes filled with  rivets
        |——————————————————————————————————————————————————————————————————————————————————|
        |Sample    |Joint type       |B/d |Tightn-|  Durability of plate at stress levels  |
        |          |                 |or  |ess, % |        Sigma_maxแ๐, ฬPa                |
        |          |                 |do, |       |————————————————————————————————————————|
        |          |                 |mm  |       |        184        |        130         |
        |          |                 |    |       |————————————————————————————————————————|
        |          |                 |    |       |  N,cycles|   LgN   | N,cycles|   LgN   |
        |——————————|—————————————————|————|———————|——————————|—————————|—————————|—————————|
        |hole              -           7.5    -       35000     4.5441    124900    5.0966 |
        |rivet      4-9 ฮัา1 34052-85   4   1 - 4    203300     5.3081   1089700    6.0373 |
        rivet       4-9 ฮัา1 34040-79       1 - 4    586400     5.7682   2718700    6.4344 |
        |——————————————————————————————————————————————————————————————————————————————————|
        |—————————————————————|
        |         90          |
        |—————————————————————|
        |   N,cycle |   LgN   |
        |———————————|—————————|
        |  479700     5.6810  |
        | 6444000     6.8092  |
        |13786100     7.1394  |
        |—————————————————————|