Document ID: chunk:federal_register_of_legislation:F2005L03990:reg:60:p8
Version: federal_register_of_legislation:F2005L03990
Segment Type: reg
Provision Reference: reg 60 (pt 8/9)
Character Range: 86591–89155

longitudinal centre line.
3.3.3.  Clean the impact surface of the skin and also the impactor face with isopropyl alcohol or equivalent prior to the test.
3.3.4.  Mount the leg assembly to the fixture shown in Figure 1b. The test fixture shall be secured rigidly to prevent movement during the impact test. The centre line of the femur load cell simulator (78051-319) shall be vertical  0,5°. Adjust the mount such that the line joining the knee clevis joint and the ankle attachment bolt is horizontal  3° with the heel resting on two sheets of low-friction (PTFE) material. Ensure that the tibia flesh is located towards the knee end of the tibia. Adjust the ankle such that the plane of the underside of the foot is vertical  3°. Adjust the knee and ankle joint to 1,5  0,5 g range before each test.
3.3.5.  The rigid impactor comprises a horizontal cylinder diameter 50  2 mm and a pendulum support arm diameter 19  1 mm (Figure 3a). The cylinder has a mass of 1,25  0,02 kg including instrumentation and any part of the support arm within the cylinder. The pendulum arm has a mass of 285  5 g. The mass of any rotating part of the axle to which the support arm is attached should not be greater than 100 g. The length between the central horizontal axis of the impactor cylinder and the axis of rotation of the whole pendulum shall be 1250  1 mm. The impact cylinder is mounted with its longitudinal axis horizontal and perpendicular to the direction of impact. The pendulum shall impact the underside of the foot, at a distance of 62  2 mm from the base of the heel resting on the rigid horizontal platform, so that the longitudinal centre line of the pendulum arm falls within 1° of a vertical line at impact. The impactor shall be guided to exclude significant lateral, vertical or rotational movement at time-zero.
3.3.6.  Allow a period of at least 30 minutes between successive tests on the same leg.
       3.3.7.  The data acquisition system, including transducers, shall conform to the specifications for CFC 600, as described in annex 8.
3.4.  Performance specification
3.4.1.  When the heel of each foot is impacted at 4,4  0,2 m/s in accordance with paragraph 3.3., the maximum impactor acceleration shall be 340  50 g.
Figure 1
Tibia impact test - test set-up specifications

Figure 1a
Upper foot impact test - test set-up specifications
Figure 1b
Lower foot impact test - test set-up specifications

Figure 2
Upper foot impact test - test set-up specifications

Figure 3
Lower foot impact test - test set-up specifications

Figure 3a