1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW3020 Safety Belt Webbing Technical Specification Copyright 2012 General Motors Company All Rights Reserved August 2012 Originating Department: North American Engineering Standards Page 1 of 14 1 Scope Note: Nothing in the specification super
2、sedes applicable laws and regulations unless specific exemption has been obtained. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. This specification establishes the safety belt webbing requirements for 3 - point safety belt assem
3、blies intended to provide design verification and compliance to the Federal Motor Vehicle Safety Standard (FMVSS) 209 and other global regulatory requirements for future GM vehicles. It defines common key physical and functional requirements enabling interchangeability between supplier systems for G
4、M vehicles worldwide. This set of specifications is intended to provide uniform direction to the various engineers regarding the design requirements, testing, and validation of each belt system being developed for GM vehicles. In part, when validated to these requirements, the safety belt system wil
5、l provide a reasonable and appropriate level of performance in real world crashes. This specification does not apply to safety belt webbing used as buckle straps, guide loop straps, or in 2 - point safety belt assemblies. 1.1 Material Description. This specification describes a narrow woven fabric u
6、sed in certain safety belt applications. The webbing described in this specification is only intended for use within retractor-side assemblies of 3 - point safety belts. The material is constructed with a double needle loom using monofilament and multifilament weft yarns. The material has knit selva
7、ges that are rounded and completely hide the weft reverse points of the monofilament. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Webbing described in this specification is classified as being either: Type A: Standard thickness webbing for use in most applications. Type B: Slightly thinne
8、r webbing for use in selected applications where additional webbing will be needed to stow into a retractor that otherwise couldnt stow that length of webbing. Type C: Low Elongation webbing for use in selected applications where a lower elongation rate is required. Low Elongation webbing is also th
9、inner than Type A webbing. Type D: High Elongation webbing for use in selected applications where a higher elongation rate is required. High Elongation webbing is also thicker than Type A webbing. Except where explicitly indicated, there are no differences in the requirements for Type A, Type B, Typ
10、e C and Type D webbing. 1.4 Remarks. Safety belt webbing is a textile product that is an integral component of a safety belt assembly. Vehicle safety belts are intended to provide injury protection benefit to occupants of the vehicle in the event of a crash. Their primary function is to restrain an
11、occupant (or child seat), and to reduce the risk or severity of injury by managing the occupants kinetic energy. Safety belt webbing must function in harmony with the rest of the safety belt subsystem, be as comfortable and unobtrusive as practicable, and be in visual harmony with the interior theme
12、 of the vehicle. Webbing must also comprehend the differences in governmental and market requirements of the different countries in which it is sold. In the event of a conflict between this specification and the documents cited herein, the text of this specification takes precedence. Nothing in this
13、 specification, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3020 Copyright 2012 General Motors Company All Ri
14、ghts Reserved August 2012 Page 2 of 14 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D747-02 FMVSS 302 ISO 105-B02 ISO 5084 CMVSS 209 ISO 105-A01 ISO 105-B06 ISO/IEC 17025 ECE R16 ISO 105-A02 ISO 105-X12 S
15、AE J882 FMVSS 209 ISO 105-A03 2.2 GM Standards/Specifications. GMW3059 GMW3235 GMW14102 GMW14317 GMW3116 GMW3417 GMW14141 GMW14334 GMW3232 GMW6992 GMW14162 GMW14831 2.3 Additional References. Lab Data Reporting Sheet (See Appendix B: Data Sheet B2). Safety Belt Webbing Material Construction Specific
16、ation (See Appendix B: Data Sheet B1). Standard Blue Dye Number: 7 Rating Scale. Tinius Olsen Scale. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 General Requirements. The tests referred to in the following requirements are based on historic performance wh
17、ich has been deemed satisfactory for meeting customer performance needs. 3.1.1 The use of “shall” in this document denotes a binding provision that must be met. 3.1.2 The use of “should” denotes a desired performance level or conformance, (e.g., materials specification) which, if not met, must be do
18、cumented and approved by both the platform release engineer and the Safety Belt Subsystem Leadership Team. 3.1.3 The term “seat belt” in this document has been replaced by the term “safety belt”, which is more globally accepted as a descriptor. 3.1.4 Laboratory testing shall be performed by a labora
19、tory that conforms to ISO/IEC 17025 and is acceptable to the responsible GM Department. Test reports must conform to 5.10.2 and 5.10.3 of ISO/IEC 17025. Supplier shall submit a letter of compliance. 3.2 Construction Requirements. 3.2.1 Physical Requirements. 3.2.1.1 General Guidelines. The propertie
20、s of a specific construction shall be documented in the Safety Belt Webbing Material Construction Specification. See Appendix B. 3.2.1.2 Monofilament Weft Yarn. All webbing must be constructed using a monofilament yarn as one weft yarn. The monofilament yarn should measure 0.25 0.015 mm. 3.2.1.3 Wov
21、en Pattern. All seat belt webbing shall contain the GM World Twill pattern. 3.2.1.4 Thickness (SAE J882). 3.2.1.4.1 Type A Webbing. Test material as received 3.2.2.1 and after Common Environmental Conditioning 3.2.2.2 shall have a thickness of 1.21 0.04 mm. After hex bar abrasion (FMVSS 209, S5.1d),
22、 webbing shall have a thickness no greater than 1.28 mm. 3.2.1.4.2 Type B Webbing. Test material as received 3.2.2.1 and after Common Environmental Conditioning 3.2.2.2 shall have a thickness of 0.8 0.03 mm. After hex bar abrasion (FMVSS 209, S5.1d), webbing shall have a thickness no greater than 0.
23、92 mm. 3.2.1.4.3 Type C Webbing. Test material as received 3.2.2.1 and after Common Environmental Conditioning 3.2.2.2 shall have a thickness of 1.16 0.03 mm. After hex bar abrasion (FMVSS 209, S5.1d), webbing shall have a thickness no greater than 1.22 mm. Provided by IHSNot for ResaleNo reproducti
24、on or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3020 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 3 of 14 3.2.1.4.4 Type D Webbing. Test material as received 3.2.2.1 and after Common Environmental Conditioning 3.2.2.2 shall
25、have a thickness of 1.25 0.03 mm. After hex bar abrasion (FMVSS 209, S5.1d), webbing shall have a thickness no greater than 1.34 mm. 3.2.1.5 Width. All webbing shall have a width of 48.00 mm maximum under no load and 46.00 mm minimum under 10 018 218 N load (980 daN according to ECE R16, 9786 450 N
26、according to FMVSS 209, S5.1a). Test material as received per 3.2.2.1 and measure width during breaking-strength test, 3.2.3.1. 3.2.1.6 Uniform Edge. 3.2.1.6.1 Type A Webbing. All webbing must have uniform, smooth, round edges measuring 1.3 0.2 mm. Inspection shall be performed as stated in Appendix
27、 A. 3.2.1.6.2 Type B Webbing. All webbing must have uniform, smooth, round edges measuring 1.0 0.2 mm. Inspection shall be performed as stated in Appendix A. 3.2.1.6.3 Type C Webbing. All webbing must have uniform, smooth, round edges measuring 1.3 0.2 mm. Inspection shall be performed as stated in
28、Appendix A. 3.2.1.6.4 Type D Webbing. All webbing must have uniform, smooth, round edges measuring 1.3 0.2 mm. Inspection shall be performed as stated in Appendix A. 3.2.2 Standard Test Conditions and Requirements. Webbing samples are to be subjected to the following specified conditions prior to te
29、sting. Note: Safety Belt System Level conditioning requirements are covered in GMW14831. Parameters specific to webbing are listed below. 3.2.2.1 Room Temperature Conditioning (As Received). Unless otherwise specified, the material shall be tested under standard conditions, 23 2 C and 65 +2/-5% Rela
30、tive Humidity (covers both FMVSS and ECE regulations). Condition specimens for 24 h prior to testing or until moisture equilibrium is reached. If specimens are tested outside the controlled environment, they shall be tested within 5 minutes of removal. 3.2.2.2 Common Environmental Conditioning. Expo
31、se material within a closed space at 80 C over water for 24 h. Next, subject material to one 24 h cycle in the following sequence: 3.2.2.2.1 Dry heat soak 6 h at 100 C, attained within 80 minutes. 3.2.2.2.2 Cold soak 6 h at 0 C, attained within 20 minutes. 3.2.2.2.3 Ambient soak remainder of the 24
32、h cycle at 23 C. 3.2.2.3 Special Light Conditioning. Refer to FMVSS 209, S5.1(e) Demonstration Procedure for Resistance to light and ECE R16; 7.4.1.2 Conditioning of Straps and Break-strength test (static) Light Conditioning for the test requirements. See 3.3.8 for FMVSS 209 color retention requirem
33、ent. 3.2.2.4 Special Heat - Conditioning per ECE R16. Refer to ECE R16 for the details for Special Heat Conditioning. 3.2.2.5 Special Cold - Conditioning per ECE R16. Refer to ECE R16 for the details for Special Cold Conditioning. 3.2.2.6 Special Water - Conditioning per ECE R16. Refer to ECE R16 fo
34、r the details for Special Water Conditioning. 3.2.3 Tensile Strength (FMVSS 209, S5.1(b) and ECE R16). For all tensile tests a minimum of three samples shall be tested and reported in Appendix B2. 3.2.3.1 As Received 3.2.2.1. Webbing shall have a minimum tensile strength of 25 kN. The lowest strengt
35、h test sample shall not be less than 90% of the highest strength test sample (group of three samples tested). 3.2.3.2 After Common Environmental Conditioning 3.2.2.2. All webbing must retain at least 80% of the average strength determined in 3.2.3.1. 3.2.3.3 After Hex Bar Abrasion (FMVSS 209, S5.1(d
36、). All webbing must retain at least 80% of the average strength determined in 3.2.3.1. 3.2.3.4 After Light - Conditioning. 3.2.3.4.1 After Light Conditioning per FMVSS 209, S5.1(e). Webbing shall retain at least 75% of the average strength determined in 3.2.3.1. 3.2.3.4.2 After Light Conditioning pe
37、r ECE R16. Webbing shall retain at least 75% of the average strength determined in 3.2.3.1 after tested to all three conditions called out in ISO 105-B02, normal conditions, low effective humidity, and high effective humidity. Provided by IHSNot for ResaleNo reproduction or networking permitted with
38、out license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3020 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 4 of 14 3.2.3.5 After Heat - Conditioning per ECE R16. Webbing shall retain at least 75% of the average strength determined in 3.2.3.1. 3.2.3.6 After Cold -
39、Conditioning per ECE R16. Webbing shall retain at least 75% of the average strength determined in 3.2.3.1. 3.2.3.7 After Water - Conditioning per ECE R16. Webbing shall retain at least 75% of the average strength determined in 3.2.3.1. Note: The technical service conducting the ECE tensile strength
40、tests may dispense with one or more of these tests if the composition of the material used or information already available renders the test or tests superfluous. 3.2.4 Stiffness. Stiffness shall be determined according to ASTM D747-02 method using a Tinius Olsen Tester. The Tinius Olsen Stiffness T
41、ester, Model 02007001, 0.70 J (6 in/lb) capacity, shall be used with an additional 45 g of added weight. The distance between the center clamp and the flex post shall be 12.5 mm. Die cut an additional ten specimens 75 mm in length and approximately 30 mm in width in the warp direction and midway bet
42、ween the selvages. Die cut an additional ten specimens in the filling direction 25 mm in width. The cut must be parallel to the filling yarns. The filling length will be the width of the webbing. Each group of ten specimens will be divided in two groups of five; five specimens will be tested face si
43、de up and five specimens will be tested face side down. Each warp specimen will have enough yarns removed from each side of the longer dimension until a width of 25 mm is obtained. Trim the filling yarns close to the exposed warp yarns. Condition the prepared specimens to 24 h in the standard atmosp
44、here. To test, place the end of one specimen (face side up) into the clamping device and tighten. Rotate the clamping device, by hand, until the sample just touches the flex post. Continue to rotate the clamping device until a reading of one is indicated on the load scale. Zero the angle indicator a
45、nd start the machine. Take the reading at 60 degrees for the warp direction and 60 degrees for the filling direction. Report the individual results for the face side up and face side down specimens in each direction. Note: The total weight of the individual weights must be 45 1 g. Do not use the num
46、bers stamped on the face of each weight. 3.2.4.1 Lateral Stiffness. The bending moment of the webbing as received 3.2.2.1, as well as after Common Environmental Conditioning 3.2.2.2 and hex bar abrasion (FMVSS 209, S5.1d) shall be 45 to 65 on Tinius Olsen scale. 3.2.4.2 Longitudinal Stiffness. The b
47、ending moment of the webbing as received 3.2.2.1, as well as after Common Environmental Conditioning 3.2.2.2 and hex bar abrasion (FMVSS 209, S5.1d) shall be 65 maximum on Tinius Olsen scale. 3.2.4.3 Stiffness Ratio. The stiffness ratio, found by dividing the Longitudinal Stiffness by the Lateral St
48、iffness, shall be no greater than 1.3. 3.2.5 Flammability. All webbing must meet the flammability requirements of GMW3232 test methods. 3.2.6 Elongation. As received 3.2.2.1 Type A and Type B webbing shall have an elongation of 10 to 12%, Type C webbing shall have an elongation of 5 to 7%, and Type
49、D webbing shall have an elongation of 12 to 14% when subjected to 11 120 N of tensile force (when tested per FMVSS 209, S5.1(c). 3.2.7 Fogging (GMW3235 Code A) Photometric. Photometric procedure: heating temperature 90 C, cooling temperature 38 C, 6 h test time, 15 h post conditioning time. The amount of fog when measured with a 60 degree gloss meter shall be 60 units or higher. Samples that result in a residue that forms a transparent
