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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1988 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J1836 ISSUED OCT88 Issued1988-10 OVERLAP SHEAR TEST FOR SEALANT ADHESIVE BONDING OF AUTOMOTIVE GLASS ENCAPSULATING MATERIAL TO BODY OPENING ForewordThis Document has not changed other than to put it into the new SAE Technical Standards Board Format. 1.ScopeThis recommended practice
5、 defines a procedure for the construction of a lap shear specimen for the purpose of testing the bondability of an automotive sealant adhesive to the elastomeric material used in automotive encapsulating. The present practice of encapsulating automotive glass is described as molding elastomeric mate
6、rial onto the outer edge of the glass using thermoplastic or thermosetting material that quickly sets in the mold. The glass is removed from the mold with cured elastomeric material bonded to the perimeter of thee glass. This encapsulated glass module can now be bonded with a sealant adhesive into t
7、he body opening of a vehicle. 2.References 2.1Applicable PublicationThe following publication forms a part of the specification to the extent specified herein. Unless otherwise indicated the lastest revision of SAE publications shall apply. 2.1.1ASTM PUBLICATIONAvailable from ASTM, 100 Barr Harbor D
8、rive, West Conshohocken, PA 19428-2959. ASTM D 1002Test Method for Strength Properties of Adhesives in Shear by Tension Loading (Metal-to- Metal) 3.Test Substrates 3.1SubstratesThe substrates used for the construction of the lap shear specimen should be coupons made from automotive sheet metal or an
9、y other rigid substrate such as plastic composites used in automotive. The other coupon should be made from elastomeric material used in automotive glass encapsulation. 3.2DimensionsThe metal test substrate and metal support substrate shall be cut into coupons 25.4 x 102.0 mm (1.0 x 4.0 in) at a nom
10、inal thickness of 0.8 mm (0.032 in). The elastomeric material shall be cut from molded sheets into 25.4 x 102.0 mm (1.0 x 4.0 in) coupons at a nominal thickness of 3.2 mm (0.125 in). All test coupons shall be free of flaws such as nicks and splinters that could give erroneous test results. 3.3Surfac
11、e CoatingsThe coating used for painting the metal or any other rigid substrate shall be recom- mended by automotive engineers. SAE J1836 Issued OCT88 -2- 3.4Surface PreparationSurface preparation with respect to cleaning and primer application should be in accordance with sealant adhesive suppliers,
12、 or automotive engineers recommendation. 4.Preparation of Test Joints 4.1The final joint geometry is as shown in Figure 1 with tolerance specified under 4.3. The lap shear specimen should be constructed without the metal backing as illustrated in Figure 2. The metal support should be bonded onto the
13、 back of the elastomeric coupon just prior to testing. The adhesive should be of suitable type to have good bondability to the metal and elastomeric coupon in order to minimize stretching or premature ripping of the elastomeric coupon while testing. FIGURE 1THREE DIMENSIONAL VIEW OF OVERLAPSHEAR TES
14、T SPECIMEN FIGURE 2SIDE VIEW OF OVERLAPSHEAR SPECIMEN The lap shear board should be constructed as in Figure 2, to give the proper dimensions for the lap shear as described in Figure 1. The elastomeric coupons should be taped onto the board so that the one in side is approximately 3.0 to 6.0 mm (0.1
15、2 to 0.24 in) from the edge of the board. Coupons can be laid side-by-side on the board to make multiple lap shear specimens. 4.2Replacement of Metal with Other SubstratesThe rigid substrates that are used to replace the metal coupons on the top section of the board in Figure 2 should be of a thickn
16、ess designated by automotive engineers. 4.3Sealant Adhesive Bond ToleranceFinal bond tolerance should be 25.4 1.0 mm (1.0 0.04 in) long, 6.4 1.0 mm (0.25 0.04 in) wide, and a height of 5.0 1.0 mm (0.2 0.04 in). SAE J1836 Issued OCT88 -3- 4.4Sealant Adhesive ApplicationThe sealant adhesive wet bead d
17、imensions can be controlled to give the cured bond dimensions specified in Figure 1. The sealant adhesive shall be extruded using a 6.4 mm (0.250 in) wide bead along the one in side of the elastomeric coupon. The bead should also be high enough so that when the metal coupon is placed down on the wet
18、 sealant adhesive, the required 5 mm (0.200 in) height shall be achieved. The sealant adhesive open time should be prescribed by adhesive supplier or automotive engineers recommendation. 4.5Sealant Adhesive CureThe lap shear composite should remain fixed to lap shear board at humidity, temperature a
19、nd time recommended by automotive engineers or adhesive supplier. 4.6Sample PreparationAfter recommended cure cycle, the lap shear specimen should be removed from the board by cutting excess cured sealant away from the side of each lap shear specimen. This trimming will assure that the lap shear spe
20、cimen will have the bond line length of 25.4 mm as described in Figure 1. 4.7ConditioningBonded lap shear specimens should be environmentally conditioned according to suppliers or automotive engineers recommendation before being tested. 5.Testing 5.1ApparatusTensile tester as described in ASTM D 100
21、2. 5.2Sample FixtureThe sample fixture described in Figure 3 should be used when testing lap shear specimens on the tensile tester. The elastomeric coupon with the metal support should fit into the space provided with the lap shear specimen resting on the shoulder of the fixture. This will permit th
22、e metal or rigid coupon part to hang down to allow clamping to the lower jaw of the tensile tester. FIGURE 3FIXTURE USED FOR TESTING OVERLAPSHEAR TEST SPECIMEN SAE J1836 Issued OCT88 -4- 5.3Sample ClampingThe elastomeric coupon should be clamped onto the front end of the fixture to prevent bending a
23、nd ripping of the elastomer away from the metal support. The sample clamping distance between bottom edge of the elastomeric supported coupon composite in fixture and clamping jaw on metal should be 38 mm (1.5 in) as illustrated in Figure 4. FIGURE 4PLACEMENT OF OVERLAP SHEAR TEST SPECIMEN INTO TEST
24、 FIXTURE 5.4Test RateLap shear specimens should be tested at a pull rate of 50.8 mm (2 in)/minute. 5.5Test QuantityA minimum of five lap shear specimens should be prepared for each test condition. 6.Report 6.1Complete identification and application of adhesive sealant and primer(s) used, including t
25、ype and manufacturers description. 6.2Complete Identification of the Elastomeric Material 6.2.1Type of elastomeric material should be described with its generic name (such as Urethane, VINYL, etc.) and manufacturers product identification. 6.2.2The physical properties of the material such as the elo
26、ngation, tensile strength, flexural modulus, etc. 6.2.3Description of surface treatment such as paint, mold release, cleaning conditions, etc. 6.3Complete identification of test metal coupon or rigid substrate including thicknesses, description of rigid substrate and paint system. SAE J1836 Issued O
27、CT88 -5- 6.4Sample History 6.4.1Description of primers and sealant adhesives conditions before application. 6.4.2Description of open time of primers and sealant adhesives in construction of lap shear specimens. 6.4.3Description of curing history of constructed lap shear specimens. 6.4.4Environmental
28、 conditions used prior to testing such as humidity, heat age, artificial weathering, etc. 6.5Report shear strength as pounds per square inch (psi) and Newtons per square meter (Pa) by measuring bond area. 6.6Report average of lap shear specimen values with individual lap shear values. Indicate mode
29、of failure on individual lap shears with estimated percentages of failure. SF . Substrate failure of elastomeric material with description CF . Cohesive failure of sealant PF . Primer failure specifying which substrate AF . Adhesive failure of sealant specifying which substrate PTF Paint failure spe
30、cifying which substrate PREPARED BY THE SAE STATIONARY GLASS BONDING TASK FORCE OF THE SAE ADHESIVES AND BODY SEALERS COMMITTEE SAE J1836 Issued OCT88 RationaleNot applicable. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThis recommended practice defines a procedure for the
31、 construction of a lap shear specimen for the purpose of testing the bondability of an automotive sealant adhesive to the elastomeric material used in automotive encapsulating. The present practice of encapsulating automotive glass is described as molding elastomeric material onto the outer edge of
32、the glass using thermoplastic or thermosetting material that quickly sets in the mold. The glass is removed from the mold with the cured elastomeric material bonded to the perimeter of the glass. This encapsulated glass module can now be bonded with a sealant adhesive into the body opening of a vehicle. Reference Section ASTM D 1002Test Method for Strength Properties of Adhesives in Shear by Tension Loading (Metal- to-Metal) Developed by the SAE Stationary Glass Bonding Task Force Sponsored by the SAE Adhesives and Body Sealers Committee