Low strain-rate sensitivity of yield stress of a modern mild steel, Appendix I Load- displacement diagrams

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LOW- STRAIN-RATE SENSITiVITY

Project nr SC 89O2.

Rapport nr SSL 321

2february 1990

K

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Specimen

i

nominal strain rate = i.E-6 [strain/s]

1 [cm] vertical = 1.0 [kN] compressive force 1 [cm] horizontal = 0.0625 [mm] endshortening zero force offset 0.250 [cm]

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7I

1 [cm] vertical

xl [cm _horizontal 1zero foce offset 'd'rect, plot

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Specimen

4,

_;

nomInal strain rate = i E 6 [strain/s]

1 [cm] vertical = i O [kN] compressive force 1 [cm] horizonta1 = 0 0625 [nun] endshortening zero force offset = -'O 050 [cm]

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.nornÍna1, stiañ rate'

1i[m]:-ver*icaLi i [cm] horizontal zero fòrce offsét direàt plot

(10)

-SpecImen

8

nominal strain rate 1 (cm] vertical i [cm] horizontal zero force offset direct plot i.E-5 [strain/s] = 1.0 [kN] compressive force 0.0625 [nun] endshortening -0.025 [cm] ti 1110_1114

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(11)

nominal strain rate = i E-5 [strain/sJ

i[cm]vrticai«

= i O [kN] compressive force i [icmc] horzontai r O 0625 [mm] endshortening

=-O.O25

[cm]

(12)

j-,ñominalstrath raté i.E-4 [stran/s]

'i [cm] vertical- i.OE ',[kNJcornpressive force

i [cm]. horizontal - O.Q625[mmlrendshortening

zero forceoffsét O.iOO .[cm]. -

(13)

--i

-Specimen 11.

nominal strain rate. 1 [cm] vertical = 1 [cm] horizontal =

zero:, force, offset

direct plot,, ..,. ,_t, -1. E-.4 [strain/s] 1.0, [kN] 'compressive force 0 0625 [mm] endshortening 0.000 (cm]

i

t L

:

TTT'

I

iI

L

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Specimen 12

nominal strain rate 1 [cm] vertical i [cm] horizontal zero force offset direct plot

l.E-4 (strain/si

1.0 [kN] compressive force = 0.0625 [mm] endshortening

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Specimen 13

nominal strain rate 1 [cm] vertical 1 [cm] horizontal zero force offset direct plot

= i.E-4 [strain/si

= 1.0 [kN] compressive force 0.0625 [mm] endshortening

(16)

nominal Strain rate 1 [cm] vertiàal 1 [cm] horizóntal zero force offset

LE-4

[stráin/s]

1.0 [kN.] .óoinpress ive. force 0 0625 [mm] endshortening 0.050 [cm]

(17)

Specimen 15

nominal strain rate 1 [cm] vertical i [cm] horizontal zero force offset direct ;lot

i.E-3 [strain/s]

1.0

[kNJ compressive force 0.0625 (mm] endshortening 0.000 [cm]

(18)

Specimen 16

nominal strain rate i.E-3 [strain/si

1 [cm] vertical 1.0 [kN] compressive force 1 [cm] horizontal 0.0625 [mm] endshortening zero force offset 0.000 (cm]

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Spechnen 17

nominal strain rate 1 [cm] vertical 1 (cm] horizontal zero force offset direct plot

i.E-3 [strain/s]

1.0 (kN] compressive force

= 0.0625 (mm] endshortening - 0.000 [cm]

(20)

Specimen 18

nominal strain rate = i.E-3 [strain/s]

1 [cm] vertical 1 [cm] horizontal zero force offset direct plot [kN] compressive force [mm] endshortening [cm] = 1.0 = 0.0625 = 0.025

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-nominal

directpiot

force 19 strain vertical horizontal - - -offset rate 1.0 i.E-3 0.0625 0.025 [kN] [mm] [cm] -[strain/s] compressive endshortening force _i li -4

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Specimen

1 [cm] 1 [cm] zero

(22)

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nominal zero plot [cm] [cm]

20

strain vertical horizontal force offset from digital

Specimen

rate oscilloscope 1.0 0.5 i.E-2 0.100 [kN] [s] [cm] [strain/si time compressive force jI; : dip : t; - h

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(23)

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21

strain rate -

i.E-2

[strain/s]

vertical

1.0 [kN] compressive force

horizontal

-

0.5 [s]

time

force offset

-

0.200

[cm]

from digital oscilloscope

iT

Specimen

nominal

1 [cm]

zero

plot

(24)

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Specimen 22

nominal strain rate -

i.E-2

[strain/s]

1 [cm] vertical

1.0 [kNI compressive force

1 [cm] vertical

0.125 [mm] endshortening

1 [cm] horizontal

0.5 [s]

time

zero force offset

0.200 [cm]

(25)

-Specimen 23

nominal strain rate i.E-2 [strain/s)

1 [cm) vertical 1.0 [kN] compressive force 1 [cm] horizontal - 0.5 [s] time

zero force offset -. 0.250 [cm]

plot from digital oscilloscope

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Specimen 24

nominal strain rate 1 [cm] vertical i [cm] horizontal

zero force ffset

i.E-2

_ 1.0

0.5

= 0.200 plot from digital oscilloscope

Es train/s ]

[kN] compressive force [s] time

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Specimen 25

nominal strain rate - i.E-2 [strain/s]

i [cm] vertical - 1.0 [kN] compressive force 1 [cm] horizontal = 0.5 [s] time

zero force offset = 0.200 [cm]

plot from digital oscilloscope

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(28)

Specimen 26

nominal strain rate

LE-1

[strain/sJ

1 [cm] vertical 1.0 [kN] compressive force

1 [cm] horizontal 0.05 [s] time

zero force offset - 0.150 [cm]

(29)

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[kN]

[s]

tr

[strain/s]

[nun] [cm]

compressive

endshortening

time

force

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Specimen

nominal

1 [cm]

zero force

plot from

27

strain rate

LE-1

vertical

1.0 vertical

0.125 horizontal

=

0.05 offset

0.175

(30)

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[strain/s]

[kN] compressive

[nun] endshortening

[s]

time

[cm] 1

-4

.. .

-

-k--f--Specimen

nominal

1 [cm]

zero force

plot from

strain

vertical

28

horizontal

digital

rate

offset

oscilloscope

i.E-1

1.0

0.125

0.05

0.200

(31)

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SpecImen 29

nominal strain rate

LE-1

[strain/s]

1 [cm] vertical

1.0 [kN] compressive force

1 [cm] horizontal

=

0.05 [s]

time

zero force offset

=

0.175 [cm)

(32)

1 [cm] vertical

1 [cui] horizontal

zero force offset

e i.E-1 [strain/s]

= 1.0 [kN] compressive

= 0.05 [s] time

= 0.200 [cm]

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