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Diffstat (limited to '3774/CH4/EX4.18')
| -rw-r--r-- | 3774/CH4/EX4.18/Ex4_18.sce | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/3774/CH4/EX4.18/Ex4_18.sce b/3774/CH4/EX4.18/Ex4_18.sce new file mode 100644 index 000000000..1c87c3fc5 --- /dev/null +++ b/3774/CH4/EX4.18/Ex4_18.sce @@ -0,0 +1,25 @@ +// exa 4.18 Pg 123 +clc;clear;close; + +// Given Data +Pmin=-300;// kN +Pmax=700;// kN +Se_dash=280;// MPa +Sy=350;// MPa +Kf=1.8;//fatigue strength factor +n=2;// factor of safety + +Pm=(Pmax+Pmin)/2;// kN +Pa=(Pmax-Pmin)/2;// kN +// sigma_m=4*Pm/%pi/d**2 +sigma_m_into_d_sq = 4*Pm*1000/%pi; +sigma_a_into_d_sq = 4*Pa*1000/%pi; +kf=1/Kf ;// fatigue strength reduction factor +kb=0.85;// size factor +ke=0.9;//load factor +ka=0.93;// surface finish factor +Se=ka*kb*ke*kf*Se_dash;// MPa +//Goodman failure equation - sigma_m/Sy+sigma_a/Se=1/n +d=sqrt((sigma_m_into_d_sq/Sy+sigma_a_into_d_sq/Se)*2.25) +printf('\n Suitable diameter of rod, d = %.f mm',d) +// Note - Ans in the textbook is wrong. |