[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR572.34]

[Page 787-789]
 
                        TITLE 49--TRANSPORTATION
 
                            OF TRANSPORTATION
 
PART 572--ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                    Subpart E--Hybrid III Test Dummy
 
Sec. 572.34  Thorax.

    (a) The thorax consists of the upper torso assembly in drawing 
78051-89, revision K and shall conform to each of the drawings subtended 
therein.
    (b) When impacted by a test probe conforming to Sec. 572.36(a) at 22 
fps +/- 0.40 fps in accordance with paragraph (c) of this section, the 
thorax of a complete dummy assembly (78051-218, revision U, without 
shoes, shall resist with a force of 1242.5 pounds +/-82.5 pounds 
measured by the test probe and shall have a sternum displacement 
measured relative to spine of 2.68 inches +/-0.18 inches. The internal 
hysteresis in each impact shall be more than 69% but less than 85%. The 
force measured is the product of pendulum mass and deceleration.
    (c) Test procedure. (1) Soak the test dummy in an environment with a 
relative humidity from 10% to 70% until the temperature of the ribs of 
the test dummy have stabilized at a temperature between 69 degrees F and 
72 degrees F.
    (2) Seat the dummy without back and arm supports on a surface as 
shown in Figure 23, and set the angle of the pelvic bone at 13 degrees 
plus or minus 2 degrees, using the procedure described in S11.4.3.2 of 
Standard No. 208 (Sec. 571.208 of this chapter).

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[GRAPHIC] [TIFF OMITTED] TC01AU91.166

    (3) Place the longitudinal centerline of the test probe so that it 
is .5  .04 in. below the horizontal centerline of the No. 3 
Rib (reference drawing number 79051-64, revision A-M) as shown in Figure 
23.

[[Page 789]]

    (4) Align the test probe specified in Sec. 572.36(a) so that at 
impact its longitudinal centerline coincides within .5 degree of a 
horizontal line in the dummy's midsagittal plane.
    (5) Impact the thorax with the test probe so that the longitudinal 
centerline of the test probe falls within 2 degrees of a horizontal line 
in the dummy midsagittal plane at the moment of impact.
    (6) Guide the probe during impact so that it moves with no 
significant lateral, vertical, or rotational movement.
    (7) Measure the horizontal deflection of the sternum relative to the 
thoracic spine along the line established by the longitudinal centerline 
of the probe at the moment of impact, using a potentiometer (ref. 
drawing 78051-317, revision A) mounted inside the sternum as shown in 
drawing 78051-89, revision I.
    (8) Measure hysteresis by determining the ratio of the area between 
the loading and unloading portions of the force deflection curve to the 
area under the loading portion of the curve.

[51 FR 26701, July 25, 1986, as amended at 53 FR 8765, Mar. 17, 1988; 62 
FR 27518, May 20, 1997; 63 FR 53851, Oct. 7, 1998]