Source: https://www.govregs.com/regulations/title49_chapterV_part571_subpartB_section571.221
Timestamp: 2019-06-19 16:00:19
Document Index: 320188509

Matched Legal Cases: ['§ 571', '§ 571', '§ 571', '§ 571', '§ 571', '§ 571']

49 CFR 571.221 - Standard No. 221; School bus body joint strength. § 571.221 - Standard No. 221; School bus body joint strength.
§ 571.221 - Standard No. 221; School bus body joint strength.
S5 Requirements.
S5.1.1 Body panels attached to each other shall have no unattached segment at the joint longer than 203 mm.
S5.2 Exclusions
S5.2.1 The requirements of S5.1 do not apply to -
S6 Procedure
S6.1 Preparation of the test specimen.
S6.1.1 If a body panel joint is 203 mm or longer, cut a test specimen that consists of any 203 mm segment of the joint, together with a portion of the bus body whose dimensions are those specified in Figure 1, so that the specimen's centerline is perpendicular to the joint at the midpoint of the joint segment. Where the body panel joint is not fastened continuously, select the segment so that it does not bisect a spot weld or a discrete fastener. Support members which contribute to the strength of a body panel joint, such as rub rails on the outside of body panels or underlying structure attached to joint members, shall remain attached to the test specimen, except that material may be removed from the support members as necessary to clear the gripping areas of the joint members being tested.
S6.1.3 Prepare the test specimen in accordance with the preparation procedures specified in ASTM E8-89 (incorporated by reference, see § 571.5).
S6.2 Determination of minimum allowable strength. For purposes of determining the minimum allowable joint strength, determine the tensile strengths of the joined body components as follows:
(a) If the mechanical properties of a joint component material are specified in ASTM E8-89 (incorporated by reference, see § 571.5), the lowest value of that material's thickness and tensile strength per unit of area shown in that source shall be used.
S6.3 Strength Test.
S6.3.1 The joint specimen is gripped on opposite sides of the joint in a tension testing machine in accordance with ASTM E8-89 (incorporated by reference, see § 571.5).
S6.3.2 Adjust the testing machine grips so that the applied force on the joint is at 90 degrees plus or minus 3 degrees from the joint centerline, as shown in Figure 1.
S6.3.3 A tensile force is applied to the specimen by separating the heads of the testing machine at any uniform rate not less than 3 mm and not more than 10 mm per minute until the specimen separates.
[41 FR 3872, Jan. 27, 1976, as amended at 41 FR 36027, Aug. 26, 1976; 67 FR 64366, 64367, Dec. 13, 2002; 68 FR 6360, Feb. 7, 2003; 77 FR 768, Jan. 6, 2012] Editorial Note:At 65 FR 11754, Mar. 6, 2000, § 571.221 was amended by revising S5.2.1(a);however, the paragraph did not exist, and the amendment could not be incorporated.