User talk:Roel Soeleman

Roel Soeleman''' Aluminium Design and Construction-Fatigue of Welded Structures'''

Purpose of calculation: 															Calculate fatigue damage in an aluminium weld subjected to constant amplitude loading. Calculation Reference 1)	Stress Evaluation																			Amplitude of horizontal load 																			F =	9000	N																										Frequency of load application										f=	10	Hertz																										Time subjected to load																			T =	6	hours																										Number of load cycles																			n1 =	2.05E+07																Horizontal stress amplitude in plate 										fa =	9.3	MPa																										Stress range of applied load									fr =	18.6	MPa																						2)	Determine weld classification and fatigue equation constants Weld Class=	4 Fatigue class index m =	3.25	This value is looked up from worksheet 'BS8118 data' Fatigue class constant A kA =	2.09E+11	This value is looked up from worksheet 'BS8118 data' Constant amplitude cut off limit foc =	21.3	MPa																									3)	Calculate number of cycles to failure and fatigue damage									set infinity (∞) to a very high value									∞=	1.00E+15						Safe number of fatigue cycles									N1 =	1.00E+15

Fatigue Damage D1 =	0.000

Conclusion: Acceptable Damage

Assessment Wind-induced Vortex Shedding on Tubular Member

Tubular Diameter, D (m):	0.2			Wall Thickness, t (m):	0.007 Member Free Length, L (m):	3.750			Member Elevation, z (m):	50 Constraint Condition, No.:	5		®   Supports at Two Ends : 	Semi-fixed - Semi-fixed Fluid Density, r (kg/m3):	1.22			Fluid Viscosity, n (m2/s):	1.50E-05 Design Wind Speed, V0 (m/s):	42.4	(1-hour average at 10m above sea-level, 50yrs return period) CONVERSION Gust Speed:				for Elevation z, 3-second average, Vgust-3s (m/s) =	70.0 1-minute average, Vgust-60s (m/s) =	59.1 1. Frequncy of Vortex Lifting Force (Excitation):						=	35.5	Hz Note: St is the Strouhal number, and for tubular members,  St =	0.12 2. Natural Frequncy of Structural Member:						=	63.4	Hz Unit Mass (kg/m), qm =	11.46			Sectional Stiffness (Nm2), EI =	1.39E+06 Based on structural support condition, take the Frequency Factor Cb =	16.12 93.31139803	3. Determine the Critical Velocity of Wind:						Vcr =  fN×D/St  =	105.7	m/s Þ		Gust Ratio Vgust-3s /Vcr	< 0.75, No Significant Vortex Excitation (OK) 4. Calculate Member Stability Parameter:						Span to Diameter Ratio, L/D =	18.8 Structural Damping Coefficient, zs = 0.14+0.36×EXP[-0.0855(L/D)] =	0.21 Member Stability Parameter, Ks = (0.04p×qm×zs)/(rD2) =	6.27 Þ		Stability Parameter Ks	< 20, -- Check below for Vibration Response 5. Determine Maximum Response:						Response Parameter, Sg = 2p×St2×Ks =	0.57 (Neglected if Vmax/Vcr <0.75 or Ks >20)						Renolds Number, Re = Vcr×D/n =	1.41E+06 Lifting Coefficient, CL =	0.17 Based on the structural support condition, Mode Shape Coeff., g =	1.161			Bending Moment Factor, Fbm =	19.035 Max. Amplitude of Vibration:			=	0.0291	m Max. Bending Moment:			Mb =  Da×FBM×(EI/L2)   =	54.57	kNm Max. Bending Stress:			sb =  (Mb/I)(D/2)   =	275.8	MPa 6. Estimation of Fatigue Life			(Assume 1-munite-average wind speeds satisfy Weibull Distribution) Weibull Shape Factor, h :	2.5			Referenced Period of Wind, Yr (yrs):	1 Weibull Scale Factor, q :	21.1	= Vmax´[ln(m1´Yr)]-1/h,  m1=525600 min./year Probability or Time Ratio for Wind Speed > 0.75Vcr, P(lock-on) = exp[-(0.75Vcr/q)h] =	1.21E-12 Max. SCF for Member/Joint:	1.6			Fatigue Stress Range Ds =2sb×SCF=	882.5	MPa Fatigue Life in Stress Cycles:	2.12E+03	Þ		Fatigue Life Short-term:	0	hours Fatigue Life Long-term:	874854	years

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Speedy deletion nomination of Fatigue aluminium
Hello Roel Soeleman,

I wanted to let you know that I just tagged Fatigue aluminium for deletion, because it seems to be a test. Did you know that the Wikipedia Sandbox is available for testing out edits?

If you feel that the article shouldn't be deleted and want more time to work on it, you can contest this deletion, but please don't remove the speedy deletion tag from the top.

You can leave a note on my talk page if you have questions. Fbergo (talk) 06:08, 19 October 2016 (UTC)