S5.1.2 Prior to testing, each specimen is conditioned for 24 hours at a temperature of 70° F. and a relative humidity of 50 percent, and the test is conducted under those ambient conditions. S5.1.3 The test specimen is inserted between two matching U-shaped frames of metal stock 1-inch wide and % of an inch high. The interior dimensions of the U-shaped frames are 2 inches wide by 13 inches long. A specimen that softens and bends at the flaming end so as to cause erratic burning is kept horizontal by supports consisting of thin, heat-resistant wires, spanning the width of the U-shaped frame under the specimen at 1-inch intervals. A device that may be used for supporting this type of material is an additional U-shaped frame, wider than the U-shaped frame containing the specimen, spanned by 10 -mil wires of heat-resistant composition at 1-inch intervals, inserted over the bottom Ushaped frame. S5.1.4 A bunsen burner with a tube of %-inch inside diameter is used. The gas adjusting valve is set to provide a flame, with the tube vertical, of 12 inches in height. The air inlet to the burner is closed. S5.1.5 The gas supplied to the burner has a flame temperature equivalent to that of natural gas. S5.2 Preparation of specimens. 2 S5.2.1 Each specimen of material to be tested shall be a rectangle 4 inches wide by 14 inches long, wherever possible. The thickness of the specimen is that of the single or composite material used in the vehicle, except that if the material's thickness exceeds inch, the specimen is cut down to that thickness measured from the surface of the specimen closest to the occupant compartment air space. Where it is not possible to obtain a flat specimen because of surface curvature, the specimen is cut to not more than 1⁄2 inch in thickness at any point. The maximum available length or width of a specimen is used where either dimension is less than 14 inches or 4 inches, respectively, unless surrogate testing is required under S4.1.1. S5.2.2 The specimen is produced by cutting the material in the direction that provides the most adverse test results. The specimen is oriented so that the surface closest to the occupant compartment air space faces downward on the test frame. S5.2.3 Material with a napped or tufted surface is placed on a flat surface and combed twice against the nap with a comb having seven to eight smooth, rounded teeth per inch. S5.3 Procedure. (a) Mount the specimen so that both sides and one end are held by the Ushaped frame, and one end is even with the open end of the frame. Where the maximum available width of a specimen is not more than 2 inches, so that the sides of the specimen cannot be held in the U-shaped frame, place the specimen in position on wire supports as described in S5.1.3, with one end held by the closed end of the U-shaped frame. (b) Place the mounted specimen in a horizontal position, in the center of the cabinet. (c) With the flame adjusted according to S5.1.4, position the bunsen burner and specimen so that the center of the burner tip is threefourths of an inch below the center of the bottom edge of the open end of the specimen. (d) Expose the specimen to the flame for 15 seconds. (e) Begin timing (without reference to the period of application of the burner flame) when the flame from the burning specimen reaches a point 11⁄2 inches from the open end of the specimen. (f) Measure the time that it takes the flame to progress to a point 11⁄2 inches from the clamped end of the specimen. If the flame does not reach the specified end point, time its progress to the point where flaming stops. (g) Calculate the burn rate from the formula Where: B=60X(D/T) B=Burn rate in inches per minute, D=Length the flame travels in inches, and T-Time in seconds for the flame to travel D inches. [36 FR 22902, Dec. 2, 1971, as amended at 40 FR 14319, Mar. 31, 1975; 40 FR 42747, Sept. 16, 1975; 40 FR 56667, Dec. 4, 1975] § 572.1 Scope. This part describes the anthropomorphic test dummies that are to be used for compliance testing of motor vehicles and motor vehicle equipment with motor vehicle safety standards. [42 FR 7151, Feb. 7, 1977] § 572.2 Purpose. The design and performance criteria specified in this part are intended to describe measuring tools with sufficient precision to give repetitive and correlative results under similar test conditions and to reflect adequately the protective performance of a vehicle or item of motor vehicle equipment with respect to human occupants. [38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7151, Feb. 7, 1977] § 572.3 Application. This part does not in itself impose duties or liabilities on any person. It is a description of tools that measure the performance of occupant protection systems required by the safety standards that incorporate it. It is designed to be referenced by, and become a part of, the test procedures specified in motor vehicle safety stan dards such as Standard No. 208, Occupant Crash Protection. [38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977] § 572.4 Terminology. (a) The term "dummy," when used in this Subpart A, refers to any test device described by this part. The term "dummy," when used in any other subpart of this part, refers to the particular dummy described in that part. (b) Terms describing parts of the dummy, such as "head," are the same as names for corresponding parts of the human body. [38 FR 20451, Aug. 1, 1973, and 42 FR 7152, Feb. 7, 1977) SA 150 M070-Right arm assembly SA 150 M071-Left arm assembly SA 150 M050-Lumbar spine assembly SA 150 M060-Pelvis and abdomen assembly SA 150 M080-Right leg assembly SA 150 M081-Left leg assembly SA 150 M010-Head assembly SA 150 M020-Neck assembly SA 150 M030-Shoulder-thorax assembly The drawings and specifications are incorporated in this part by reference to the nine headings, and are available for examination in Docket 73-8, Room 5108, 400 Seventh Street, S.W., Washington, D.C. Copies may be obtained from Keuffle and Esser Company, 1521 North Danville Street, Arlington, Virginia 22201. The drawings and specifications are subject to change, but any amendment will be accomplished by appropriate administrative procedures and noted by publication in the FEDERAL REGISTER, and be available for examination and copying as noted in this paragraph. The drawings and specifications are on file in the reference library of the FEDERAL REGISTER, National Archives and Records Service, General Services Administration, Washington, D.C. (b) Adjacent segments are joined in a manner such that throughout the range of motion and also under crashimpact conditions there is no contact between metallic elements except for contacts that exist under static conditions. (c) The structural properties of the dummy are such that the dummy conforms to this part in every respect both before and after being used in vehicle tests specified in Standard No. 208 (§ 571.208). A specimen of the dummy is available for surface measurements, and access can be arranged through: Office of Crashworthiness, National Highway Traffic Safety Administration, 400 Seventh Street, SW., Washington, D.C. 20590. [38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977; 42 FR 34304, July 5, 1977] EFFECTIVE DATE NOTE: In § 572.5, an undesignated sentence was added at the end, at 42 FR 34304, July 5, 1977, effective July 5, 1978. § 572.6 Head. (a) The head consists of the assembly shown as number SA 150 M010 in Figure 1 and conforms to each of the drawings subtended by number SA 150 M010. (b) When the head is dropped from a height of 10 inches in accordance with paragraph (c) of this section, the peak resultant accelerations at the location of the accelerometers mounted in the head form in accordance with § 572.11(b) shall be not less than 210g, and not more than 260g. The acceleration/time curve for the test shall be unimodal and shall lie at or above the 100g level for an interval not less than 0.9 milliseconds and not more than 1.5 milliseconds. The lateral acceleration vector shall not exceed 10g. (c) Test procedure: (1) Suspend the head as shown in Figure 2, so that the lowest point on the forehead is 0.5 inches below the lowest point on the dummy's nose when the midsagittal plane is vertical. (2) Drop the head from the specified height by means that ensures instant release onto a rigidly supported flat horizontal steel plate, 2 inches thick and 2 feet square, which has a clean, dry surface and any microfinish of not less than 8 microinches (rms) and not more than 80 microinches (rms). (3) Allow a time period of at least 2 hours between successive tests on the same head. [38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977] § 572.7 Neck. (a) The neck consists of the assembly shown as number SA 150 M020 in Figure 1 and conforms to each of the drawings subtended by number SA 150 M020. (b) When the neck is tested with the head in accordance with paragraph (c) of this section, the head shall rotate in reference to the pendulum's longitudinal centerline a total of 68°±5° about its center of gravity, rotating to the extent specified in the following table at each indicated point in time, measured from impact, with a chordal displacement measured at its center of gravity that is within the limits specified. The chordal displacement at time T is defined as the straight line distance between (1) the position relative to the pendulum arm of the head center of gravity at time zero, and (2) the position relative to the pendulum arm of the head center of gravity at time T as illustrated by Figure 3. The peak resultant acceleration recorded at the location of the accelerometers mounted in the head form in accordance with § 572.11(b) shall not exceed 26g. The pendulum shall not reverse direction until T=123ms. is vertical and coincides with the plane of motion of the pendulum's longitudinal centerline. Mount the neck directly to the pendulum as shown in Figure 4. (2) Release the pendulum and allow it to fall freely from a height such that the velocity at impact is 23.5±2.0 feet per second (fps), measured at the center of the accelerometer specified in Figure 4. (3) Decelerate the pendulum to a stop with an acceleration-time pulse described as follows: (i) Establish 5g and 20g levels on the a-t curve. (ii) Establish t, at the point where the rising a-t curve first crosses the 5g level, t, at the point where the rising a-t curve first crosses the 20g level, t. at the point where the decaying a-t curve last crosses the 20g level, and t. at the point where the decaying a-t curve first crosses the 5g level. (iii) t2-t1 shall be not more than 3 milliseconds. (iv) t-t2 shall be not less than 25 milliseconds and not more than 30 milliseconds. (v) t-ta shall be not more than 10 milliseconds. (vi) The average deceleration between t2 and t,shall be not less than 20g and not more than 24g. (4) Allow the neck to flex without impact of the head or neck with any object other than the pendulum arm. [38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977; 42 FR 12176, Mar. 3, 1977] § 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 § 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 1400 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 §572.11(i) and in the orientation specified in §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 17.7±0.1 inches above the seating surface at impact. (3) Align the test probe specified in § 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] § 572.9 Lumbar spine, abdomen, and pelvis. (a) The lumbar spine, abdomen, and pelvis consist of the assemblies designated as numbers SA 150 M050 and SA 150 M060 in Figure 1 and conform to the drawings subtended by these numbers. (b) When subjected to continuously applied force in accordance with paragraph (c) of this section, the lumbar spine assembly shall flex by an amount that permits the rigid thoracic spine to rotate from its initial position in accordance with figure 11 by the number of degrees shown below at each specified force level, and straighten upon removal of the force to within 12 degrees of its initial position in accordance with figure 11. |