. 0 73g→ = 0,002.73 .1, 4 16 5/3,5 1, 4 H v→ = = 1, 4.50.73,33 1 1, 014 2 .15 6368 ,13 .1, 06 .1, 13 HV K→ = + = 1, 06 .1, 014 .1, 13 1, 21 H K→ = = Thay số : 2 2 .15 6368 ,13 .1, 21. (3,5 1) 274 .1, 77.0,78 508,86( ) 50.3,52.73,33 H MPa σ + =. = 2 4, 21. 50.73,33 1 1 1, 01 2 2 .15 6368 ,13 .1, 37 .1, 1 w w3F FV F F V b d K T K K β α = + = + = 1, 1 .1, 37 .1, 01 1,52 F F F FV K K K K β α = = = Với 1, 65 1/ 1,65 0,6Y α ε ε = → = = 0 0 0 17 ,34 1 17,34 /14 0 0,876Y β β =. 6 .15 ); 0 g =47(bảng 6 .16 )) - 0,25 .12 8,85 32, 21( ) be e b K R mm= = = . Lấy b=33 mm - 9,66.54,47.33,5 1 1 ,18 1, 12 .1. 1 ,18 1, 32 2.42006,87 .1, 12 .1 HV H K K= + = → = = 2 2 2.42006,87 .1, 32 4 1 274 .1, 76.0,87