Current through Register Vol. 54, No. 50, December 14, 2024
Section 107.7 - Test conditions(a)Impact attenuation test. Requirements for impact attenuation testing are as follows:(1) Impact attenuation shall be measured by determining acceleration imparted to an instrumented test headform on which a complete helmet is mounted as specified in § 107.6(b) (relating to preliminary test procedures), when it is dropped in guided free fall upon fixed hemispherical and flat steel anvils.(2) Each helmet shall be impacted at four sites with two successive, identical impacts at each site. Two of these sites shall be impacted upon a flat steel anvil and two upon a hemispherical steel anvil as specified in paragraphs (7) and (8). The impact sites shall be at any point on the area above the test line described in § 107.6(a)(3) and separated by a distance not less than 1/6 of the maximum circumference of the helmet.(3) The guided free fall drop heights for the helmet and test headform combination onto the hemispherical anvil and flat anvil shall be 54.5 inches and 72 inches, respectively.(4) Test headforms for impact attenuation testing shall be constructed of magnesium alloy, K-1A, and shall exhibit no resonant frequencies below 3,000 hertz.(5) Weight of the drop assembly, as specified in Table I of Appendix A, shall be the combined weight of the instrumented test headform and supporting assembly for the drop test. The weight of the supporting assembly shall not exceed 20% of the weight of the drop assembly. The center of gravity of the combined test headform and supporting assembly shall lie within a cone with its axis vertical and forming a 10° included angle with the vertex at the point of impact.(6) The acceleration transducer shall be mounted at the center of gravity of the combined test headform and supporting assembly with the sensitive axis aligned to within 5° of vertical when the test headform is in the impact position. The acceleration data channel shall comply with SAE Recommended Practice J211 requirements for channel class 1,000.(7) The flat anvil shall be constructed of steel with a 5 inch minimum diameter impact face, and the hemispherical anvil shall be constructed of steel with a 1.9 inch radius impact face.(8) The rigid mount for both of the anvils shall consist of a solid mass of at least 300 pounds, the outer surface of which consists of a steel plate with minimum thickness of one inch and minimum surface area of 1 square foot.(b)Penetration test. Requirements for penetration testing are as follows: (1) The penetration test shall be conducted by dropping the penetration test striker in guided free fall, with its axis aligned vertically, onto the outer surface of the complete helmet, when mounted as specified in § 107.6(b), at any point above the test line, described in § 107.6(a)(3), except on a fastener or other rigid projection.(2) Two penetration blows shall be applied at least 3 inches apart, and at least 3 inches from the centers of any impacts applied during the impact attenuation test.(3) The height of the guided free fall shall be 118.1 inches, as measured from the striker point to the impact point on the outer surface of the test helmet.(4) The contractable surfaces of the penetration test headforms shall be constructed of a metal or metallic alloy having a Brinell hardness number no greater than 55, which shall readily permit detection should contact by the striker occur. The surface shall be refinished if necessary prior to each penetration test blow to permit detection of contact by the striker.(5) The weight of the penetration striker shall be 6 pounds, 10 ounces.(6) The point of the striker shall have an included angle of 60°, a cone height of 1.5 inches, a tip radius of 0.019 inch, standard 0.5 millimeter radius and a minimum hardness of 60 Rockwell, C-scale.(7) The rigid mount for the penetration test headform shall be as described in subsection (a)(8).(c)Retention system test. Requirements for retention system testing are as follows: (1) The retention system test is conducted by applying a static tensile load to the retention assembly of a complete helmet, which is mounted, as described in § 107.6(b), on a stationary test headform as shown in Figure 4 of Appendix A, and by measuring the movement of the adjustable portion of the retention system test device under tension.(2) The retention system test device consists of both an adjustable loading mechanism by which a static tensile load is applied to the helmet retention assembly and a means for holding the test headform and helmet stationary. The retention assembly is fastened around two freely moving rollers, both of which have a 0.5 inch diameter and a 3 inch center-to-center separation, and which are mounted on the adjustable portion of the tensile loading device, as shown in Figure 4 of Appendix A. The helmet is fixed on the test headform as necessary to ensure that it does not move during the application of the test loads to the retention assembly.(3) A 50 pound preliminary test load is applied to the retention assembly, normal to the basic plane of the test headform and symmetrical with respect to the center of the retention assembly for 30 seconds, and the maximum distance from the extremity of the adjustable portion of the retention system test device to the apex of the helmet is measured.(4) An additional 250 pound test load is applied to the retention assembly, in the same manner and at the same location as described in paragraph (3), for 120 seconds, and the maximum distance from the extremity of the adjustable portion of the retention system test device to the apex of the helmet is measured. This section cited in 67 Pa. Code § 107.5 (relating to requirements); and 67 Pa. Code § 107.6 (relating to preliminary test procedures).