Corelation between Lumbar Spine Hardness
and Chest Deflexion Characteristics
ISO/TC22/SC12/WG5
2012/5/31
JASTI Co., Ltd.
Background
・Requirement by a Drawing
Hardness:75-85(Shore A)、 Angle:45.5°± 0.5°
Cable torque:1.1-1.4 N・m by User manual
→50th dummy Lumbar Spine is requested by Torso Flexion test
→Lumbar Spine Hardness is to support Upper torso and influence to Chest defluxion result.
*Remarks: 5F Torso Flexion test
Multi-factors (Abdominal、Chest Jacket、Pelvis, Lumbar Spine.)
→Lumbar spine test is useful for evaluations
2012/5/31
2 ISO/TC22/SC/12/WG5 Kyoto
Quality control ①Production
・Rubber mold:
→No weld problem, or
No sand blasted surface
②Static load test
・Bonded strength: 240kg
Metal – Rubber bonded
・Recovery performance
In 30min→Specification:
45.5°+/- 0.5°
2012/5/31
4 ISO/TC22/SC/12/WG5 Kyoto
Test method ・Pelvic Adaptor+ Lumbar Spine +
Spine Box attachment
・Cable torque:1.25 N・m
・Spine Box attachment :7.16kg
・Loaded radius: 584mm * Top of Pelvic Adaptor center~Neck Bracket
・Initial angle:13° *Angle at top of Spine Box attachment
・Pull Angle:30° *Top center of Pelvic Adaptor~Pull point
・ Cable to table angle at 59° at pull angle as 30°
5
Cable Torque
No. Test No Torque Bending Angle/°
Hardness 10 20 30
1 1 1.1N 0 92.77 147.13 236.02 80
2 2 1.1N 0 91.59 147.11 232.38 80
3 3 1.1N 0 91.54 145.22 230.08 80
4 4 1.1N 0 90.91 145.68 235.39 80
5 Aver. 1.1N 0 91.70 146.29 233.47 80
6 6 1.25N 0 96.28 153.63 237.81 80
7 7 1.25N 0 99.05 150.75 241.12 80
8 8 1.25N 0 97.62 152.83 227.91 80
9 9 1.25N 0 96.44 152.61 238.22 80
10 Aver. 1.25N 0 97.35 152.46 236.27 80
11 11 1.4N 0 97.07 154.42 249.49 80
12 12 1.4N 0 100.39 155.38 248.38 80
13 13 1.4N 0 100.39 163.36 248.52 80
14 14 1.4N 0 100.71 157.45 246.41 80
15 Aver. 1.4N 0 99.64 157.65 248.20 80
2012/5/31
ISO/TC22/SC/12/WG5 Kyoto
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Bottom 0
0 15 Solid Hairline 1
MS Pゴシック 10
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2012/5/31
ISO/TC22/SC/12/WG5 Kyoto
2012/5/31
7 ISO/TC22/SC/12/WG5 Kyoto
BendingTest Result by Hardness
0 10 20 301 1 1.25N 0 120.27 185.37 299.26 852 2 1.25N 0 120.10 191.02 308.22 853 3 1.25N 0 118.13 188.74 309.46 854 9 1.25N 0 109.85 176.47 270.85 835 10 1.25N 0 114.87 173.20 262.24 836 4 1.25N 0 96.28 153.63 237.81 807 5 1.25N 0 99.05 150.75 241.12 808 6 1.25N 0 97.62 152.83 227.91 809 8 1.25N 0 96.44 152.61 238.22 80
10 11 1.25N 0 92.12 151.35 239.92 8011 7 1.25N 0 72.65 118.44 193.95 7512 12 1.25N 0 71.92 118.10 191.55 7513 14 1.25N 0 72.05 117.20 194.11 75
Hardness
Hardness difference
No. Test No. TorqueBending Angle (Deg)
Bending Test Resulted by Various Hardness
0
50
100
150
200
250
300
350
0 5 10 15 20 25 30 35
85°_A
85°_B
85°_C
83°_A
83°_B
80°_A
80°_B
80°_C
80°_D
80°_E
75°_A
75°_B
75°_C
0
100
200
300
400
500
600
0 10 20 30 40 50 60 70
Max
. Im
pac
t Fo
rce
/ d
aN
Max. Deflexion / mm
Chest Impact Test
2012/5/31
10 ISO/TC22/SC/12/WG5 Kyoto
Chest Impact test result 1 (By Lumbar Surface Shore A)
Max.Deflexion Hysterics Max. Force Probe Speed1 415 1.25 68.40 72.46 540.09 6.71 752 415 1.25 69.35 71.83 552.96 6.62 753 415 1.25 68.91 72.14 547.18 6.67 75
68.89 72.14 546.74 6.67 75
Max.Deflexion Hysterics Max. Force Probe Speed1 390 1.25 71.82 71.00 558.79 6.71 802 390 1.25 70.71 71.06 555.82 6.67 803 390 1.25 69.94 72.57 552.19 6.67 80
70.82 71.54 555.60 6.68 80
Max.Deflexion Hysterics Max. Force Probe Speed1 407 1.25 71.45 71.00 562.42 6.76 852 407 1.25 71.56 71.53 563.35 6.76 853 407 1.25 71.70 71.20 563.21 6.62 85
71.57 71.24 562.99 6.71 85
Hardness
平均
No. Test No. Torque
No. Test No. Torque
Hardness
平均
Hardness
平均
No. Test No. Torque
Chest Impact test result 2 (Chest Deflexion result)
75 80 851 68.40 71.82 71.452 69.35 70.71 71.563 68.91 69.94 71.70
Aver. 68.89 70.82 71.57
75 80 851 72.46 71.00 71.002 71.83 71.06 71.533 72.14 72.57 71.20
Aver. 72.14 71.54 71.24
75 80 85
1 540.09 558.79 562.42
2 552.96 555.82 563.353 547.18 552.19 563.21
Aver. 546.74 555.60 562.99
Test NoMax. Impact Force
Max. Chest Deflexion
Test No.Histrycs
Test No.
12 ISO/TC22/SC/12/WG5 Kyoto
Test result 1
Hardness vs Chest Deflexion
R2 = 0.9385
65
67
69
71
73
75
75 80 85
Hardness
Max.D
eflexio
n
2012/5/31
Test Result 2
R2 = 0.9973
520
530
540
550
560
570
580
75 80 85
Hardness
Max.I
mapc
t F
orc
e/d
aN
Hardness vs Max. Impact Force
Test Result 3
Hardness vs Hysterics
R2 = 0.9643
65
67
69
71
73
75
75 80 85
Hardness
Hys
teri
cs/%
Result Summary
• Resulted by Lumbar Spine Hardness
• Test Shore A 75 ~85
Average of : 75 --- 85
Max. Chest deflection : 68.89 ~ 71.57mm
Hysterics : 72.14 ~ 71.24%
Max. Impact Force : 546.74 ~ 562.99N
Conclusion 1 ①.Different surface hardness influence on Torso Foreword / Rearward movement
⇒Harder Lumber spine keep Upper Torso in the original position, the impact force energy transferred more to Rib deflexion.
②.Hybrid-Ⅲ50th Lumbar Spine Required performance should be confirmed by the Bending hardness by Torso Flexion Test.
Conclusion 2 ・Current checking points:
Drawing specifications=Surface hardness ;
Shore A 75°to 85°
・Standard production request; Shore A 80+/-1°
OR
・New Lumbar spine production corridor;
(Lumbar Spine Shore A 80+/-2°)
+10°: 86~106 N +20°:138~167 N +30°:220~267 N
0
50
100
150
200
250
300
350
0 5 10 15 20 25 30 35
85°_A
85°_B
85°_C
83°_A
83°_B
80°_A
80°_B
80°_C
80°_D
80°_E
75°_A
75°_B
75°_C
upper limit
lower limit
New Reccomendable Corridor
Further Study Target We continue more Torso flexion test with Lumbar Spine Shore A 80+/-1 (or new corridor ) . We use Lumbar Spine ,Shore A 80+/-1 hardness for developing new Rib Dumping material.
By our Torso bending test for determ in a reasonable corridor (bending force/angle) based on Shore A 80+/-2, as a next stage with Shore A 80+/-1. as well as Torso Flexion test as 5F.
Thank You
.
2012/5/31 ISO/TC22/SC/12/WG5 Kyoto
21
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