Analysis for cyclic loading
according to AD 2000-Merkblatt S2 (October 2004)
Input data
Time point 1
Time point 2
Stress components
σ
x
N/mm²
σ
y
N/mm²
σ
z
N/mm²
τ
xy
N/mm²
τ
yz
N/mm²
τ
zx
N/mm²
Maximum cycle temperature
T
°C
Yield strength
R
p0.2
N/mm²
Tensile strength at room temperature
R
m20
N/mm²
Material group
ferrit
austenit
Loadings type
mechanical
thermal without discontinues
thermal + mechanical
Surface roughness
R
z
µm
Actual wall thickness
s
mm
Component welding class
not welded
welded, class K1
welded, class K2
welded, class K3
Fatique notch proof
no
yes
Vessel longitudial or circumferential weld
no
yes
Ground flushed and 100% tested weld
no
yes
Stress relieved
no
yes
Calculation theory
shear stress theory
deformation energy theory
Calculate
Calculation
Decisive calculation temperature
T*
°C
Yield strength at
T*
R
p0.2/T*
N/mm²
Reference stress amplitude
2σ
va
N/mm²
Surface influence factor
f
o
Wall thickness influence factor
f
d
Mean stress influence factor
f
M
Temperature influence factor
f
T*
k
e/v
– factor
k
e/v
Maßgebende
2σ
va
2σ
va
*
N/mm²
Fluctuating stress
2σ
a
*
N/mm²
Results
Permissible load cycles number
N
all
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