1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW3371 Overlap Shear Adhesion Test for Stationary Glass Bonding Materials Copyright 2011 General Motors Company All Rights Reserved June 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This standard describes a te
2、st procedure to determine the shear adhesion strength of polyurethane adhesives used for bonding stationary glass and encapsulating glass. Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English
3、language shall take precedence. 1.1 Purpose. Not applicable. 1.2 Foreword. Not applicable. 1.3 Applicability. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications.
4、9981062 GMW3221 B 040 0007 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 Varnish Makers and Painters (VM and P) Naphtha (9981062), Test Petrol B 040 0007 or approved cleaning solvent. 3.2.2 Razor knife. 3.2.3 Primer applicator. 3.2.4 Air operated or electric adhesive cartridge dis
5、pense gun. 3.2.5 Air regulator. 3.2.6 Tensile tester capable of pulling 2000 N with a crosshead speed of 100 mm/minute and 10% strain. 3.2.7 Coupon holding racks capable of maintaining a 6 +2/-0 mm) bond height between upper and lower bonded test coupons (the racks are to be used in conjunction with
6、 specified substrate thickness). 3.2.8 Test Substrate. 3.2.8.1 Test substrates are determined by the material to be tested or the appropriate material specification. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking
7、permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3371 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 2 of 4 3.2.8.2 Substrate coupons are to have dimensions of 25 100 mm with the following recommended nominal thicknesses. Variations with size and
8、 coatings may be used as described by a related GM specification or when approved by the appropriate GM engineering group. Glass: 5.0 mm Metal: 0.8 mm Fiber reinforcing plastic 2.5 mm Encapsulating material 3.2 mm Note: Flexible substrates are to be maintained in a shear position during testing by r
9、einforcing the coupon with a metal backing or other equivalent method. 3.3 Test Vehicle/Test Piece. 3.3.1 Test Material. 3.3.1.1 Approved or development substrate primers (if required) as dictated by the material specification or recommended by the adhesive supplier. 3.3.1.2 Fixed glass bonding adhe
10、sive. 3.4 Test Time. Not applicable. Calendar time: Days Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure Summary of Test Procedure. This test procedure is used to determine the material strengths of fixed gl
11、ass bonding adhesives when uniform applied between two sample substrates and pulled in shear to failure. Standard Conditions. All testing in standard conditions to this specification shall be performed in accordance with GMW3221 Code A, Procedure for Standard Conditions of Organic Materials. 4.1 Pre
12、paration. 4.1.1 Test Sample Preparation. 4.1.1.1 Prepare the appropriate number of shear test specimens for each test condition as dictated by the material specification. If not specified prepare five shear test specimens for each test condition. 4.1.1.2 Clean all substrates with Varnish Makers and
13、Painters (VM and P) Naphtha or Test Petrol B 040 0007 unless otherwise specified. 4.1.1.3 Apply appropriate primers to the coupons in the area to be bonded. Unless otherwise specified, a nominal dry film thickness per the manufactures specification is required. 4.1.1.4 Air dry primed coupons for 30
14、to 60 minutes at 22 3 C and 50 5% relative humidity (RH). Record the actual temperature and relative humidity. 4.1.1.5 Place one set of coupons on the coupon holding rack with 1 mm spacing between samples. Bonding area of coupons must be on the inner edge of the coupon rack. Secure the opposite end
15、of coupons to the holding rack with tape. 4.1.1.6 Apply a bead of the adhesive approximately 6 to 8 mm inboard from the end of the coupon. Bead dimensions of the cured assembly are 6 10 25 mm (dimension tolerances of +2/-0 mm). 4.1.1.7 Within 5 minutes of applying the adhesive, position the coupons
16、of the remaining substrate over the racked coupons so as to sandwich the adhesive between the appropriate portions of the coupons. Secure the rear end of the upper test coupons to the holding rack with tape. See Figure 1 for shear adhesion assembly. Copyright General Motors Company Provided by IHS u
17、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3371 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 3 of 4 All dimensions in mm Figure 1: Shear Assembly Adhesion
18、 4.1.1.8 Unless otherwise specified, cure at 22 3 C and 50 5% RH for a minimum of 72 hours prior to removing from the rack and subjecting the specimens to additional environments. Record the actual temperature and relative humidity. 4.1.1.9 After environments, allow the test specimens 12 to 24 hours
19、 recovery time at ambient conditions. 4.2 Conditions. Not applicable. 4.2.1 Environmental Conditions. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3
20、 Instructions. 4.3.1 Test Procedure. Cut the test specimens and pull the bonded coupons in shear to failure in a tensile test machine at a crosshead speed of 100 mm/minute and 10% strain. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation.
21、5.3.1 Evaluation and Rating. 5.3.1.1 Separation mode classifications. CF cohesive separation of the adhesive AF adhesive separation of the adhesive from the interface surface/substrate. BC basecoat BP body side adhesive primer CC clearcoat CONT continuous EC electrodeposition coating, ELPO, e-coat G
22、 glass GP glass adhesive primer P/S primer surfacer Identify other substrate materials as appropriate (e.g., Structural Reaction Injection Molding (SRIM), Sheet Molded Composite, (SMC), and Acrylonitrile Butadiene Styrene (ABS). 5.3.1.2 Measure the amount separation of each type separation mode clas
23、sification identified. Record the measurement in mm and report the percentage and separation mode with the shear strength value as stated above, e.g., 3125 kPa 80%CF/20%AF, 4210 kPa 50%CF/50%CF-CC. 5.4 Report. 5.4.1 Record all materials used during testing including the following information. 5.4.1.
24、1 Test material source identification. 10 5 6 25 100 All dimensions in mm. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3371 Copyright
25、 2011 General Motors Company All Rights Reserved June 2011 Page 4 of 4 5.4.1.2 Test material product identification. 5.4.1.3 Test material batch numbers. 5.4.1.4 Substrate identification. 5.4.2 Record the following test results. 5.4.2.1 Maximum load N. 5.4.2.2 Area of break mm2 5.4.2.3 Shear strengt
26、h kPa. 5.4.3 Record the Separation Mode. Record the separation mode of the adhesive from the test substrate (i.e., cohesive separation of the adhesive, adhesive separation of the adhesive to the pinchweld primer, adhesive separation of the pinchweld primer to the painted panel, adhesive or cohesive
27、separation of the various paint layers, etc.,). Identify both the separation mode and the paint layers that separated. Use the separation mode classifications below to record the separation modes and substrates in the appropriate test report. 6 Safety This standard may involve hazardous materials, o
28、perations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 No
29、tes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. ABS Acrylonitrile Butadiene Styrene RH Relative Humidity SMC Sheet Molded Composite. SRIM Structural Reaction Injection Molding VM Varnish Maker 8 Coding System This standard shall be referenced in other documents, drawings,
30、 etc., as follows: Test to GMW3371 9 Release and Revisions This standard was originated in January 2000. It was first approved by the GM Global Glass Bonding Adhesive and Sealer Technology Development Group (TDG) in May 2006. It was first published in May 2006. Issue Publication Date Description (Organization) 1 MAY 2006 Initial publication. 2 June 2011 Five Year Refresh (Global Adhesives Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
