# Specimen nr. 2867a loaded 3 times in Tension testing
# Ref.: J.Bauschinger, "Ueber die Veraenderung der Elasticitaetsgrenze
# und der Festigkeit des Eisens und Stahls durch Strecken und Quetschen, 
# durch Erwaermen und Abkuehlen und durch oftmal wiederholt Beanspruchung,"
# Mittheilungen aus dem Mechanisch-Technischen Laboratorium der
# K. Technischen Hochschule in Muenchen, 1886, Seiten 1-116 plus 3 figures.
# (there are two "Seiten" numbers per page)
#
# Copyright (C)  2014  Fatigue Design Evaluation Comm.
#    Permission is granted to copy, distribute and/or modify this document
#    under the terms of the GNU Free Documentation License, Version 1.3
#    or any later version published by the Free Software Foundation;
#    with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
#    A copy of the license is available here:
#     "GNU Free Documentation License": "http://www.gnu.org/licenses/fdl.html"
#
# Bauschinger's tables are composed of half-cycles in tension or 
# compression,  with some unload/reload interludes in these larger
# half cycle sets.   Each half cycle test has re-zeroed the 
# extensometer.  Also at the begin of each set he measured the diameter
# and the length of the sample,  but I suspect that the length
# measurement is not as accurate as the extensometer measurements.
# At the top of a tensile half cycle set, or at bottom of the compressive
# half cycles, the scales of the extensometer become unreadable due to
# continuous flow caused by the load/weight increment.   There is often
# no unloaded deflection reading after this occurs, thus one must guess
# at the final defl. at the large loads,  or use the next set's  initial
# measured specimen length to back calculated where the previous peak
# ended.  
# Thus some of the end points of the half cycle sets printed here are
# questionable guesses made by me and should not be blamed on Bauschinger.
# Note that when there are 3 numbers in a line and the first two are 0,
# then the third number is a left-over deflection from the previous test
# loading, and should be added to all following deflections.
# AC Oct 2014

# Table IX, tension and Compressioin test of Weld metal
# Spec. nr. 2867a
# As received run; Tension, d=4.55co, l=6.00cm
# data on pages 75-78 of report
0   0    0
4  0.66
8  1.34
12 2.02
16 2.70
0  0.07     #unload
16 2.72
20 3.39
24 4.04
28 4.74
32 5.42
0  0.16    #unload
32 5.46
34 5.80
0  0.06  # unload strain not reported here. estimate 0.169 per tonne
 # 6 days later, restart tension   d=4.55cm l=6.00cm
0   0   0.06   #appears to be a re-zero of extensometer
4 0.63
8 1.31
12 1.95
16 2.62
0 0.02    # unload
16 2.63
20 3.28
24 3.92
28 4.58
32 5.24
0 0.01   #unload
32 5.22
36 6.15
0 0.41
 #   51 min. puase start compression test; d=4.55 l=6.00
0    0    0.41  #; note add of previous reading
-4 -.69
-8 -1.36
-12 -2.04
-16 -2.76
0 -0.18
-16 -2.79
-20 -3.15
-24 -4.24
-28 -5.07
-32 -6.16
0.  -.94
-32 -6.31
-36 -8.76
0 -2.90    #unload  notice plas. strain
 #   a 5min pause restart compression;  d=4.55, l=6.0
0    0    -2.90  #  re-zero gauge
-4 -0.60
-8 -1.26
-12 -1.90
-16 -2.58
0   +0.02  # (effectively zero)
-16 -2.55
-20 -3.23
-28 -4.57
-32 -5.27
0  -0.02   # unloaded
-32 -5.29
-36 -8.02
0 -1.15    #unload:  plas strain
0 -1.06  # after 20hrs
 # restart in compression after 20hrs  d=4.55 l=6.00
0    0    -1.06  # rezero
-4 -0.63
-8 -1.29
-12 -1.93
-16 -2.59
0 -0.02    #unload
-16 -2.57
-20 -3.24
-24 -3.90
-28 -4.57
-32 -5.25
0   -0.05  #unload
-32  -5.28
-36 -6.25
0 -.028  #Stop  Oct. 18 1885
 #   for 1hr the restart in Tension d=4.55 l=6.00
0   0   -.028
4 0.62  # there is a typo here in Bauschinger report
8 1.55
12 2.41 
16 3.34
0 0.76  #unload
16 3.37
20 4.37
24 5.48
28 6.67
32 7.99
0 2.88   # unload  (got plas. strain)
32 8.12
36 9.59
0 3.71  # Stop nr. 4
 #  46 min pause restart in compression d=4.55 l=6.00cm
0    0    3.71
-4 -.77
-8 -1.65
-12 -2.62
-16 -3.63
0 -0.99
-16 -3.69
-20 -4.71
-24 -5.82
-28 -7.12
-32 -9.03
0 -3.68  #unload/reload
-32 -9.36
-36 -13 # <- this is only an estimate: sclase run trhuogh, slight 
0   -6.91  #estimate 36*0.169 for unload
 #            squishing of sample. He should have taken a reading 
 #            unloading.
 #   30-1/2 hrs, unloaded, restart a compression test.
0  0  -6.91  #(estimate only)#  =4.55cm l=6.00cm
-4 -0.66
-8 -1.31
-12 -1.92
-16 -2.62
0  0.0  0
# After 15 1/2 hrs restart in tension
0    0    0
4 0.82
8 1.79
12 2.93
16 4.33
0 1.70
# wait 2 hrs then restart in tensioin
0 0 1.70
4 0.69
8 1.33
12 2.00
16 2.76
18 3.42
0  0.48
 # After 9 min., during which the load was repeatedly applied
 # 4 times between 0 and 18ton. through which the total deformation
 # increased to 3.65 and the permanent deformaton increased to 0.72/1000cm  
 #   (cyclic creep ? )
 # Restart in Tension,  d=4.55  l=6.00
0  0  0.72
4 0.69
8 1.32
12 1.96
16 2.61
18 2.98
0  0.06 
 # After 27 hrs restart in compression; d=4.55  l=6.00
0     0     0.06
-4 -0.68
-8 -1.39
-12 -2.14
-16 -2.90
-18 -3.30
0  -0.31
-18 -3.31
-20 -3.78
-24 -4.75
-28 -5.83
-32 -7.18
0 -1.79
-32 -7.33
-36 -10.40
-40 -25.15
-43 -77.24  # (strain is estimated by AC)
 # Bauschinger notes that specimen is "strongly squished"
 # After 30 min pause, restart in compression
 #  d=4.58cm  l=5.93cm   <- note the permanent set.
0    0  -70  # (assume unload elastic from -43ton )
-4 -0.69
-8 -1.37
-12 -2.05
-16 -2.70
0     0     0
-16 -2.70
-20 -3.40
-24 -4.10
-28 -4.8
-32 -5.49
0  -0.09   #
-32 -5.52
-36 -6.38
-40 -8.02
-42 -9.90
-44 -15   #Scales run through.  Strain is a guess by AC
 #  Unload strains not recorded.
 #  After a 3 day pause, restart in Tension  d=4.8cm l=5.93cm
0    0    -7.60 # Strain is a guess by AC based on elastic unload)
4 0.74
8 1.82
12 3.09
16 4.74
0  2.11
16 5.01
20 7.14
24 10.07
28 13.31
32 20.00
0  14.61  #
32 20.62
36 28.25
40 42.25
44  70 #  deflection  is a guess  by AC
 # Bauschinger comment: scales run trough without reaching 44 tons.
 # Note:  Bauschinger did 9 more tests after this but all have very 
 #        little plastic strain,  so they are not recored here.
 #   Final l = 5.84  thus  (6.00 -5.94)/6.00 = 0.010 comp. strain