1、 Reference number ISO 15172:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 15172 First edition 2005-07-01 Road vehicles Wheels Nut seat strength tests Vhicules routiers Roues Essai de rsistance des siges dcrou ISO 15172:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance w
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6、0 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedISO 15172:2005(E) ISO 2005 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national st
7、andards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International o
8、rganizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules giv
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10、75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15172 was prepared by Technical Committee ISO/TC 22, Ro
11、ad vehicles, Subcommittee SC 19, Wheels. INTERNATIONAL STANDARD ISO 15172:2005(E) ISO 2005 All rights reserved 1 Road vehicles Wheels Nut seat strength tests 1 Scope This International Standard specifies a test method to evaluate the strength of the nut seat of wheels intended for use on passenger c
12、ars, light trucks and multi-purpose vehicles. While this test ensures the minimum strength of the nut seat, the wheel must also have a degree of flexibility to allow torque retention. This test evaluates the axial strength of the nut seat. In addition, the informative annex provides recommended bear
13、ing area to ensure enough strength for the rotational force in tightening a nut against the nut seat. 2 Test procedures 2.1 General The principle of this test is to apply an axial load to the nut seat and determine permanent deformation of the nut seat. An additional test to measure yield strength i
14、s also specified. 2.2 Wheels for test Use only fully processed wheels including all coatings representative of production parts intended for the vehicle. 2.3 Test equipment The test equipment shall be capable of supporting the complete wheel mounting area with a rigid flat surface which is dimension
15、ally representative of the vehicle hub (see Figure 1). The equipment shall provide a hardened (R c45 min) punch or load applicator with a shape designed to match the seat face and the fastener contact area representative of that specified for the wheel. The punch or load applicator shall provide a m
16、easured, non-rotational axial force of F (the maximum load obtained in the bolt when the nut is tightened to the maximum recommended torque) perpendicular to the plane of the supporting surface. F shall depend on the type of fastener used to fix the wheel on the hub. Only one nut seat of a wheel sha
17、ll be loaded at a time. In addition to the loading mechanism, devices to measure nut seat deformation or punch travel shall be required. ISO 15172:2005(E) 2 ISO 2005 All rights reservedKey F measured axial force H nut seat height 1 hardened punch 2 nut/bolt seat 3 supporting surface Figure 1 Test no
18、menclature and loading fixture 2.4 Strength test procedures 2.4.1 Deformation test method The deformation test shall be carried out as follows: a) Insert the test wheel in the loading device and align the punch with the nut seat. b) Apply the load F 0(0,6 F) to the nut seat and measure the nut seat
19、height (H 0 ). c) Apply a load (F) and hold for 15 s. d) Reduce the load to F 0and measure the nut seat height (H 1 ). e) Repeat steps c) and d) five times and measure the nut seat height (H n ) at F 0load each time. f) Repeat steps a) through e) on each nut seat of the wheel. The entire procedure i
20、s repeated on additional wheels if necessary. Performance requirements shall be as follows: a) The nut seat shall not have newly formed cracks. b) The nut seat height change (H 1 H 0 ) after the first cycle shall not exceed 0,6 mm. c) The fifth nut seat height change (H 5 H 0 ) shall not exceed 0,80
21、 mm. 2.4.2 Yield strength test method Insert a new test wheel on the loading device and align the load applicator with the nut seat. Apply the load to the individual nut boss until complete collapse. Record the maximum load prior to collapse. Test each nut seat, but do not perform tests on adjacent
22、nut bosses. Therefore, two or more new wheels shall be required to completely evaluate the wheel. ISO 15172:2005(E) ISO 2005 All rights reserved 3 Annex A (informative) Bearing surface recommendation The repeatability of the yield strength test and deformation test is optimum when the following crit
23、eria is met or exceeded. This recommendation uses the applied stresses to predict yielding at a critical value given by the maximum shear stress (Tresca) criterion. At the critical value, the sum of the applied stresses from the stud tension and nut torque equal the yield point of the nut seat mater
24、ial. The applied stresses are a conservative approximation for the principal stresses. It is important to note that stud tension creates a compressive stress on the nut seat. aBearing surface. bMean radius. Figure A.1 Nomenclature for mean radius and bearing area The tables below give example values
25、 of B sfor typical assumed properties. Use the following formula to calculate bearing surface areas for wheels made from materials with other properties: B s= T s+ (T q /R)/Y where B sis the bearing surface; T sis the stud tension; T qis the applied torque; R is the mean radius of nut seat; Y is the
26、 yield strength of the material. ISO 15172:2005(E) 4 ISO 2005 All rights reservedTable A.1 Calculated steel wheel minimum bearing surface using stress differentials (sq. mm) Applied Torque (Nm) Stud Tension (N) 90 100 110 120 130 140 150 160 12 000 92,7 97,5 102,3 107,0 111,8 116,6 121,3 126,1 16 00
27、0 109,3 114,1 118,9 123,6 128,4 133,2 137,9 142,7 20 000 125,9 130,7 135,5 140,2 145,0 149,8 154,5 159,3 24 000 142,5 147,3 152,0 156,8 161,6 166,4 171,1 175,9 28 000 159,1 163,9 168,6 173,4 178,2 183,0 187,7 192,5 This calculation assumes a minimum yield of 241 Mpa and a mean nut seat diameter of 1
28、7,4 mm to represent typical low carbon steels. Table A.2 Calculated aluminum wheel minimum bearing surface using stress differentials (sq. mm) Applied Torques (Nm) Stud Tension (N) 90 100 110 120 130 140 150 160 12 000 185,0 194,1 203,2 212,3 221,4 230,5 239,6 248,7 16 000 219,3 228,4 237,5 246,6 25
29、5,7 264,8 273,9 283,1 20 000 253,6 262,7 271,9 281,0 290,1 299,2 308,3 317,4 24 000 288,0 297,1 306,2 315,3 324,4 333,5 342,6 351,7 28 000 322,3 331,4 340,5 349,6 358,7 367,8 377,0 386,1 This calculation assumes a minimum yield of 116,5 Mpa and a mean nut seat diameter of 18,85 mm to represent typical aluminum wheels. ISO 15172:2005(E) ICS 43.040.50 Price based on 4 pages ISO 2005 All rights reserved
