welded alum cracks are bad
fracture mechanics
FATIGUE CRACK GROWTH ANALYSIS
=============================
DATE: 29-Aug-17 TIME: 21:04:12
NASGRO(R) Version 8.20 (DLL), January 2017
Final Version
Copyright(c) 2017 Southwest Research Institute(R).
All Rights Reserved.
PROBLEM TITLE
-------------
[no title given]
U.S. customary units [in, in/cycle, kips, ksi, ksi sqrt(in)]
Crack Growth Model: Non-Interaction
Ratio of growth increment to current crack size = 0.0050
Mode of Computations: Regular
(Beta factors computed cycle-by-cycle, if the block is such)
Equation/Table: NASGRO Equation
Material Data Source: User-entered
GEOMETRY
--------
MODEL: SC01 -Surface crack (2D) in finite width plate.
Plate Thickness, t = 0.2500
Plate Width, W = 3.0000
INITIAL FLAW SIZE (user specified)
----------------------------------
a (init.) = 0.1000
c (init.) = 0.2500
a/c (init.) = 0.4000
MATERIAL
--------
Material File Name: NASMF.XMLZ
Material File Description: NASA data/NASGRO eqn (single temp)
MATL 1: 1000-9000 SERIES AL
6000 series
Material 1, Data ID: M6ABA1AB1
Alloy Description: 6061-T6,T62 Al
Alloy Cond/HT: Weld (unk); weld/parallel/as welded; LA
; Room temp
Material Properties:
:Matl: UTS : YS : K1e : K1c : Ak : Bk : Thk : Kc : Keac :
: No.: : : : : : : : : :
:----:-------:-------:-------:-------:-------:-------:-------:-------:-------:
: 1 : 26.0: 23.0: 35.0: 26.0: 1.00: 0.75: 0.250: 45.4: :
: Matl :------- Crack Growth Equation Constants -------:
: No. : C : n : p : q : Alpha: Smax/:
: : : : : : : Flow :
:-------:-----------:-------:------:------:------:------:
: 1 : 0.110D-07 : 3.500 : 0.50 : 1.00 : 1.50 : 0.30 :
:Materi-:---------- Threshold & Small-Crack Constants ---------:
: al No.: DK1 : Cth+ : Cth- : Alpha: Smax/: Small Crk Constts :
: : : : : : Flow : a0 : DKth(s)/:
: : : : : : : : DKth(l) :
:-------:------:------:------:------:------:---------:---------:
: 1 : 1.28: 2.20 : 0.10 : 2.00 : 0.30 : 0.0015 : 0.20 :
da/dN multiplicative factor for matl No. 1: 1.0000
Cth+ = 0, Cth- = 0 are used throughout
FATIGUE SPECTRUM
----------------
[schedule title]
[Note: Stress = Input Value * Scale Factor]
Stress Scale Factors for Block Case: 1
Scale Factor for Stress S0: 1.0000
Scale Factor for Stress S1: 0.0000
Schedule info. was input manually
Total No. of Blocks in Schedule = 1
Block Number and Case Correspondences:
Block Number Block Case No.
From - To
1 - 1 1
Stresses: Remote tension, bending or pin load
FATIGUE SCHEDULE BLOCK INPUT TABLE
----------------------------------
[schedule title]
SINGLE DISTINCT BLOCK
S : M: NUMBER : S0 : S1 :
T : A: OF : : :
E : T: FATIGUE : : :
P : L: CYCLES : (t1) : (t2) : (t1) : (t2) :
----:--:-------------:---------:---------:---------:---------:
1: 1: 10000.00 : 0.00: 20.00: 0.00: 0.00:
Environmental Crack Growth Check for Sustained Stresses (Kmax < Keac) Is NOT Enabled.
FATIGUE SCHEDULE BLOCK STRESS TABLE
-----------------------------------
[schedule title]
SINGLE DISTINCT BLOCK
S : M: NUMBER : S0 : S1 :
T : A: OF : : :
E : T: FATIGUE : (ksi) : (ksi) :
P : L: CYCLES : (t1) : (t2) : (t1) : (t2) :
----:--:-------------:---------:---------:---------:---------:
1: 1: 10000.00 : 0.00: 20.00: 0.00: 0.00:
Environmental Crack Growth Check for Sustained Stresses (Kmax < Keac) Is NOT Enabled.
ANALYSIS RESULTS
----------------
Cycles Crack a Crack c F0(a) F0(c) F1(a) F1(c)
0 0.1000000E+00 0.2500000E+00
# ADVISORY: Net-section stress > Yield and failure is imminent
# (Unless (a) UTS > 2 YS, or
# (b) KIc/YS > 0.5 sqrt. in.(2.5 sqrt. mm.) and bending dominates.)
# at Cycle No. 180
# of Load Step No. 1
# of Block No. 1
# of Schedule No. 1
# Crack Sizes: a = 0.102270 , c = 0.250469 , a/c = 0.4083
# Total Cycles = 180
1.2966945E+03 0.1199672E+00 0.2549738E+00 0.100145E+01 0.826871E+00 0.420013E+00 0.693875E+00
2.3530976E+03 0.1400266E+00 0.2623188E+00 0.964617E+00 0.874795E+00 0.304297E+00 0.701604E+00
3.2677681E+03 0.1602117E+00 0.2728431E+00 0.932899E+00 0.919647E+00 0.192276E+00 0.699955E+00
3.4360837E+03 0.1642572E+00 0.2753987E+00 0.927587E+00 0.928584E+00 0.170470E+00 0.698955E+00
# FINAL RESULTS:
# Net-section stress (Sn) exceeds flow stress.
# Flow stress = 0.5*(yield+ultimate).
# Sn by fatigue load = 24.51, Sn by limit stress = 0.00. Flow stress = 24.50.
# at Cycle No. 3436
# of Load Step No. 1
# of Block No. 1
# of Schedule No. 1
# Crack Sizes: a = 0.164257 , c = 0.275399 , a/c = 0.5964
# Total Cycles = 3436
Execution time (hh:mm:ss): 00:00:00.0
Note: this is elapsed wall-clock time, not CPU time!