[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: 49CFR572.8]

[Page 760]
 
                        TITLE 49--TRANSPORTATION
 
                            OF TRANSPORTATION
 
PART 572--ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                     Subpart B--50th Percentile Male
 
Sec. 572.8  Thorax.

    (a) The thorax consists of the assembly shown as number SA 150 M030 
in Figure 1, and conforms to each of the drawings subtended by number SA 
150 M030.
    (b) The thorax contains enough unobstructed interior space behind 
the rib cage to permit the midpoint of the sternum to be depressed 2 
inches without contact between the rib cage and other parts of the dummy 
or its instrumentation, except for instruments specified in paragraph 
(d)(7) of this section.
    (c) When impacted by a test probe conforming to Sec. 572.11(a) at 14 
fps and at 22 fps in accordance with paragraph (d) of this section, the 
thorax shall resist with forces measured by the test probe of not more 
than 1450 pounds and 2250 pounds, respectively, and shall deflect by 
amounts not greater than 1.1 inches and 1.7 inches, respectively. The 
internal hysteresis in each impact shall not be less than 50 percent and 
not more than 70 percent.
    (d) Test procedure: (1) With the dummy seated without back support 
on a surface as specified in Sec. 572.11(i) and in the orientation 
specified in Sec. 572.11(i), adjust the dummy arms and legs until they 
are extended horizontally forward parallel to the midsagittal plane.
    (2) Place the longitudinal center line of the test probe so that it 
is 17.70.1 inches above the seating surface at impact.
    (3) Align the test probe specified in Sec. 572.11(a) so that at 
impact its longitudinal centerline coincides within 2 degrees of a 
horizontal line in the dummy's midsagittal plane.
    (4) Adjust the dummy so that the surface area on the thorax 
immediately adjacent to the projected longitudinal center line of the 
test probe is vertical. Limb support, as needed to achieve and maintain 
this orientation, may be provided by placement of a steel rod of any 
diameter not less than one-quarter of an inch and not more than three-
eighths of an inch, with hemispherical ends, vertically under the limb 
at its projected geometric center.
    (5) Impact the thorax with the test probe so that its longitudinal 
centerline falls within 2 degrees of a horizontal line in the dummy's 
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 mounted 
inside the sternum.
    (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.

[38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977]