# Specimen nr. 2867d tested 7 times in Tension and Compression.
# Table XII seiten 85-86.
# 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

# From data table XII on page 86 of Bauschinger report
# Weld(iron) Lab. Nr. 2867d

#Initial conditions:  5 days of 16_t = 984_at Compressive load
# Then 2 days of 16t tensile load without exceeding the yield.
#Initial  d=4.55cm  l=6.00cm
0 0 0   #start test in Compression
-4 -0.67 # <-  0.67 is cm  Thus Strain=  0.67/1000.  Load is tonnes
-8 -1.35
-12 -2.04
-16 -2.70
0  0  0   #unload shows 0 strain again
-16 -2.70
-20 -3.33
-24 -3.98
-28 -4.61
-32 -5.25
0 0.02
-32 -5.25
-36 -6.01
-40 -32.06 
-42   -77  # guess by FAC        #scales run out
 #   After unload specimen L=5.96cm  thus Strain= (6-5.96)/6= .0067 Comp.
 # After 3 days test in Compression again  d=4.57cm  L=5.96cm
0  0   -70 # number from above guess less unloading strain
-4 -0.63
-8 -1,26
-12 -1.90
-16 -2.52
0 0 0     # unload is elastic
-16 -2.52 # reload
-20 -3.16
-24 -3.80
-28 -4.43
-32 -5.05
0   0  0
-32 -5.05
-36 -5.71
-40 -6.40
-44 -7.16
-48 -9.80
0   -2.35     # unload
-48 -10.80
-52 -33.79 #scales run out.  Defl. is a guess by FAC.  After
 #   unloading strain, measured by spec. length is (6.00 -5.85)/6 = 0.025
 #   which would indicate a permanent deflection of 25 comp.
0    0     -25
-4 -0.64
-8 -1.26
-12 -1.92
-16 -2.61
0   -0.04
-16 -2.61
-20 -3.29
-24 -3.99
-28 -4.70
-32 -5.41
0   -0.12
-32 -5.39
-36 -6.13
-40 -6.89
-44 -7.71
-48 -8.62
0   -0.34
-48 -8,63
-52 -9.80
-54 -43.03 #Scales run through,  Defl. is a guess by FAC.  After
 #   unloading strain measured by spec. length is (6.00-5.80)/6= 0.0333
0 0 -33.9  #Part 4 test: 4days later, d=4.60 L=5.80 compression.
-4.0 -0.59
-8.0 -1.17
-12  -1.76
-16 -2.40
0     0     0
-16 -2.40
-20 -3.04
-24 -3.65
-28 -4.29
-32 -4.92
0      0      0  #
-32 -4.92
-36 -5.53
-40 -6.18
-44 -6.83
-48 -7.67
0   -0.09
-48 -7.68
-52 -8.45
-56 -9.85
-60 -45.14  #Scales runout slowly. Defl. is estim. from next L measure
 #     Unloaded shows L= 5.79 thus 6-5.79)/6=,035 -> defl.=35 permanent
 #
0     0  -35.00   #After 6.5hrs restart a compression d=4.61 L=5.79
-4 -0.61
-8 -1.26
-12 -1.88
-16 -2.50
0 0 0     #
-16 -2.50
-20 -3.13
-24 -3.82
-28 -4.49
-32 -5.17
0 -0.09   #
-32 -5.19
-36 -5.89
-40 -6.60
-44 -7.38
-48 -8.17
0 -0.17
-48 -8.18
-52 -9.00
-56 -10.10
-60 -13.26
-64 -47.8  #Scales disappear; Unload L=5.78cm thus Str=.037
0   -36.98 # -64*0.169 = -10.81 elastic unload estimate.
 #  3 days later test in Tension   a=4.625 L=5.78cm
0   0   -36.98   #restart in tension
4 0.63
8 1.25
12 1.90
16 2.68
0 0.27    #
16 2.72
20 3.78
24 5.39
28 7.67
32 11.22
0 6.27    #
32 11.65
36 16.00
40 23.02
44 32.16
48 46.83
0  38.01    #
48 47.62
52 90     #a Guess.  Scales run through. Unload L=5.83cm thus Str=
0  81.21  # assume  52*0.169 elastic unload deflection.
  #
0   0   81.21   # ???   dunno  about this one
4 0.60    #restart in Tens.  with  d=4.61  L=5.83
8 1.18
12 1.76
16 2.35
0  0  0
16 2.35
20 3.01
24 3.76
28 4.62
0  0.42    # end of specimen test and table XII.