Perhitungan Perpanjangan Perhitungan Reduksi Penampang

c. q = 39,82 x100 mm 65,05 mm 25,9 x100 mm 65,05 mm 39,15 65,05 2 2 2 2 = = − Rata-rata= 41 , 38 3 82 , 39 14 , 39 26 , 36 = + + 3. Variasi arus 160 A a. 57,47 x100 mm 71,06 mm 40,84 x100 mm 71,06 mm 30,22 71,06 q 2 2 2 2 = = − = b. q = 56,68 x100 mm 65,05 mm 36,87 x100 mm 65,05 mm 41,28 65,05 2 2 2 2 = = − c. q= 58,26 x100 mm 67,28 mm 39,2 x100 mm 67,28 mm 28,18 67,28 2 2 2 2 = = − Rata-rata= 47 , 57 3 26 , 58 68 , 56 47 , 57 = + + Lampiran 5. Tabel Hasil Pengujian Tarik untuk Kekuatan Tarik Baja Paduan Rendah Parameter σ u MPa σ y MPa ε q 647,7 512,7 29,5 69,35 643,3 500,8 31 66,78 Raw materials 628,9 493,2 26 69,38 Rata-rata 639,9 504,2 28,83 68,50 512,8 437,6 9,3 36,17 100 Amper 631,6 525,5 10,75 30,71 Rata-rata 519,5 445,2 8,66 33,44 645,9 526,1 12,90 40,02 655,4 534,6 15,78 33,87 130 Amper 640,1 546,2 12,40 24,61 Rata-rata 647,1 535,6 13,69 32,83 666,1 544,6 19,85 43,82 663,6 526,6 20,20 60,25 160 Amper 724,5 588,2 20,05 31,34 Rata-rata 684,7 553,1 20,03 45,14 Lampiran 6. Perhitungan untuk Kualitas Kekuatan Tarik Baja Paduan Rendah 1. Perhitungan Kekuatan Tarik Maksimal σ u = U A P Dimana : P u = Beban kg σ u = Tegangan ultimate MPa A = luas mula-mula mm 2 1. Raw materials a. Pu=10000 kg x 6410 100 1 , 64 = kg σ u = 64,77 mm 98,97 kg 6410 2 = kgmm 2 = 647,7 MPa b. Pu=10000kg x 6410 100 1 , 64 = kg σ u = 64,33 mm 99,64 kg 6410 2 = kgmm 2 =643,3 MPa c. Pu=10000 kgx 6210 100 1 , 62 = kg σ u = 62,89 mm 98,75 kg 6210 2 = kgmm 2 = 628,9 MPa Rata-rata= 9 63,9 3 kgmm 62,89 64,33 64,77 2 = + + kgmm 2 = 639,9 MPa 2. Variasi arus 100 A a. Pu=10000kg x 5140 100 4 , 51 = kg σ u = 51,28 mm 100,24 kg 5140 2 = kgmm 2 = 512,8 MPa b. Pu=10000 kg x 6040 100 4 , 60 = kg σ u = 63,16 mm 95,63 kg 6040 2 = kgmm 2 = 631,6 MPa Rata-rata= 57,22 2 m 63,16kgm 51,28 2 = + kgmm 2 = 572,2 MPa 3. Variasi arus 130 A a. Pu=10000 kg x 6680 100 8 , 66 = kg σ u = 9 64,5 mm 103,42 kg 6680 2 = kgmm 2 = 645,9 MPa b. Pu=10000 kg x 6690 100 9 , 66 = kg σ u = 65,54 mm 102,08 kg 6690 2 = kgmm 2 = 655,4 MPa c. Pu=10000 kg x 6620 100 2 , 66 = kg σ u = 1 64,0 mm 103,42 kg 6620 2 = kgmm 2 = 640,1 MPa Rata-rata= 1 64,7 3 kgmm 64,01 65,54 64,59 2 = + + kgmm 2 = 647,1 MPa 4. Variasi arus 160 A a. Pu=10000kg x 6740 100 4 , 67 = kg σ u = 66,61 mm 101,19 kg 6740 2 = kgmm 2 = 666,1 MPa b. Pu=10000kgx 6730 100 3 , 67 = kg σ u = 66,36 mm 101,41 kg 6730 2 = kgmm 2 = 663,6 MPa c. Pu=10000kg x 7380 100 8 , 73 = kg σ u = 72,45 mm 101,86 kg 7380 2 = kgmm 2 = 724,5 MPa Rata-rata= 68,47 3 kgmm 72,45 66,36 66,61 2 = + + kgmm 2 = 684,7 MPa

2. Perhitungan Tegangan Luluh

tu Pu mm 1 = P x 100 mm 1 ty x P y = A P o y y = σ Dimana : P = Beban yang digunakan kg P y = Beban yield kg Pu = Beban ultimate kg A = Luas penampang mula-mula mm 2 tu = Tinggi ultimate mm ty = Tinggi yield mm σ y = Tegangan yield MPa 1. Raw materials Perbandingan 1:2 a. 1 mm = 2 120 1 , 64 x =0,267 t y = 95 mm Py = 5074 kg x10000 100 95x2x0,267 = kg σ y = 51,27 mm 98,97 kg 5074 2 = kgmm 2 = 512,7 MPa b. 1 mm = 2 118 1 , 64 x =0,272 t y = 93 mm Py= 5050 kg x10000 100 93x2x0,272 = kg σ y = 50,08 mm 99,64 kg 5050 2 = kgmm 2 = 500,8 MPa c. 1 mm = 2 116 1 , 62 x =0,268 t y=91 mm Py= 4870 kg x10000 100 91x2x0,268 = kg σ y = 49,32 mm 98,97 kg 4870 2 = kgmm 2 = 493,2 MPa Rata-rata = 2 2 2 kgmm 50,42 kgmm 3 151,27 3 kgmm 49,32 50,68 51,27 = = + + = 504,2 MPa 2. Variasi arus 100 A Perbandingan 1:2 a. 1 mm = 2 96 4 , 51 x =0,268 ty=82 mm Py= 4387 kg x10000 100 82x2x0,27 = kg σ y = = 2 mm 100,24 kg 4387 43,76 kgmm 2 = 437,6 MPa b. 1 mm = 2 114 4 , 60 x =0,265 t y=95 mm Py= 5025,5 kg x10000 100 95x2x0,265 = kg σ y = 52,55 95,63mm 5025,5kg 2 = kgmm 2 = 525,5 MPa Rata-rata= 481,5 kgmm 48,15 2 96,31kgmm 2 kgmm 52,55 43,76 2 2 2 = = = + MPa 3. Variasi arus 130 A Perbandingan 1:2 a. 1 mm = = 2 124 8 , 66 x 0,269 ty=101 mm Py= 5440,87 kg x10000 100 9 101x2x0,26 = kg σ y = 52,61 mm 103,42 kg 5440,87 2 = kgmm 2 = 526,1 MPa b. 1 mm = 2 125 9 , 66 x =0,268 ty=102 mm Py= 5457 kg x10000 100 8 102x2x0,26 = kg σ y = 2 2 kgmm 53,46 mm 102,08 kg 5457 = =534,6 MPa c. 1 mm = 2 123 2 , 66 x =0,269 ty=105 mm Py= 5649 kg x10000 100 9 105x2x0,26 = kg σ y = 54,62 mm 103,42 kg 5649 2 = kgmm 2 = 546,2 MPa Rata-rata = 2 2 2 53,56kgmm kgmm 3 160,69 3 m 54,62kgm 53,46 52,61 = = + + = 535,6 MPa 4. Variasi arus 160 A Perbandingan 1:2