1、Designation:E155508E155512 Standard Specication for Structural Paste Adhesive for Sandwich Panel Repair 1 This standard is issued under the xed designation E1555; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last re
2、vision.Anumber in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope 1.1 This specication denes those characteristic
3、s that are required of adhesives to be used in the repair of sandwich panels for durable, rigidwall, relocatable structures. 1.1.1 This specication covers two-part epoxy adhesive suitable for bonding aluminum alloy facings to nonmetallic core, core tocore,andcoretoperimeteraluminumextrusionframeinth
4、erepairofdurablerigidwallrelocatablestructures.Theadhesiveshall be suitable for forming bonds that will withstand exposure to temperatures from54 to 93C (65 to 199F) and high relative humidityandwillalsowithstandthecombinationsofstress,temperature,andrelativehumiditythatareexpectedtobeencountered in
5、 service. The adhesive shall also be suitable for the bonding of panel inserts and edge attachments. 1.2 The values stated in SI units are to be regarded as the standard where only SI units are given, or where SI units are given rst followed by inch-pound units; where inch-pound units are given rst
6、followed by SI units, the inch-pound units are to be regarded as the standard. 1.3 The following safety hazards caveat pertains only to the test methods described in this specication.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the resp
7、onsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: 2 B209Specication for Aluminum and Aluminum-Alloy Sheet and Plate D1002Test Method forAppar
8、ent Shear Strength of Single-Lap-JointAdhesively Bonded Metal Specimens byTension Loading (Metal-to-Metal) D1781Test Method for Climbing Drum Peel for Adhesives D2919Test Method for Determining Durability of Adhesive Joints Stressed in Shear by Tension Loading E4Practices for Force Verication of Tes
9、ting Machines E631Terminology of Building Constructions E864Practice for Surface Preparation of Aluminum Alloys to Be Adhesively Bonded in Honeycomb Shelter Panels E1091Specication for Nonmetallic Honeycomb Core for Use in Shelter Panels E1749Terminology Relating to Rigid Wall Relocatable Shelters 2
10、.2 Federal Specications: 3 MIL-STD-401Sandwich Constructions and Core Materials; General Test Methods QQ-A-250/8dAluminum Alloy 5052 H34 Plate and Sheet QQ-A-250/11dAluminum Alloy 6061 T6 Plate and Sheet 3. Terminology 3.1 DenitionsSee Terminologies E631 and E1749 for denitions of general terms used
11、 in this specication. 1 This specication is under the jurisdiction ofASTM Committee E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.53 on Materials and Processes for Durable Rigidwall Relocatable Structures. CurrenteditionapprovedNov.1,2008Nov.1,2012.PublishedDec
12、ember2008December2012.Originallyapprovedin1993.Lastpreviouseditionapprovedin20032008 as E155503.E155508. DOI: 10.1520/E1555-08.10.1520/E1555-12. 2 ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatserviceastm.org.ForAnnualBookofASTMStandards volume information
13、, refer to the standards Document Summary page on the ASTM website. 3 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil. This document is not anASTM standard and is intended only to provide the us
14、er of anASTM standard an indication of what changes have been made to the previous version. Because it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version of the standard
15、as published by ASTM is to be considered the official document. Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 14. Material 4.1 The adhesive shall be a two-part thermosetting epoxy paste containing no asbestos and when tested using t
16、he test methods described in Section 67, shall meet the requirements of Section 45. The adhesive shall not have a deleterious effect on the components being bonded over the range of temperatures at which the adhesive will be used. 5. Physical Requirements 5.1 Working Characteristics: 5.1.1 Applicati
17、onThe adhesive shall be suitable for application to facings and core materials.The adhesive shall not drip and shall not develop an overall average sag of 6.3 mm (0.25 in.) or more when tested in accordance with the procedures described in 6.77.7. 5.1.2 Adhesive LifeThe adhesive, when mixed in 1-qt
18、kit quantities in a standard quart paint can, allowed to sit for 30 min at 236 3C (73.46 5.4F), and then used to prepare test specimens as prescribed in 6.1-7.1-6.37.3, shall still be able to deliver the lap shear property levels listed in Table 1 for the 23C temperature test condition. 5.1.3 The ad
19、hesive, when mixed in a quart kit and allowed to stand in ambient still air, shall not, as a result of an exothermic reaction, heat itself to a temperature of 49C (120F) or above.This shall be performed in a chemical fume hood so that heat and any potentially toxic fumes that may be released as a re
20、sult of exothermic reaction are controlled.Apreliminary test, using a pint kit, shall be conducted to determine if a potential problem exists. 5.1.4 CuringThe adhesive shall be capable of curing at 236 3C (73.46 5.4F) in 7 days, or for no longer than 3 h at a temperature of 60 to 66C (140 to 150.8F)
21、, with a curing pressure not to exceed 14 psig. In a 236 3C (73.46 5.4F) cure, the curing pressure shall also be a maximum of 14 psig and shall only be required during the rst 24 h of cure. In a 236 3C (73.4 65.4F)cure,theadhesiveshallbecapableofdeveloping3.45MPa(500psi)lapshearstrength,whentestedat
22、23Ctemperature, within the rst 24 h of cure. 5.1.5 Mix RatioThe mix ratio for the two parts of the adhesive shall be dened by the manufacturer but shall be in the range from 10:1 to 1:1 by weight. 5.2 Storage LifeThe storage life of the two parts of the adhesive, from date of shipment, when stored i
23、n airtight containers at2363C(73.465.4F),shallbeatleast12months.Theadhesiveshallbeconsideredtohavemetthisstorageliferequirement if all the characteristics described in 4.15.1 and 4.35.3 are met by the adhesive after the 12-month storage period described above. 5.3 Mechanical PropertiesThe mechanical
24、 properties of the adhesive, when cured for 3 h at 636 3C (145.46 5.4F) or 7 days at 236 3 C (73.46 5.4F) at a cure pressure not to exceed 14 psig, shall meet the requirements of Tables 1-4. 6. Signicance and Use 6.1 Adhesives used in the repair of sandwich panels for durable, rigidwall, relocatable
25、 structures must have a combination of mechanicalpropertylevelsandenvironmentalresistancethatwillensurelong-termdurabilityoftheadhesivebondswhenexposed tosevereclimaticexposures.Inaddition,theseadhesivesmusthaveprocessabilitycharacteristicsthatpermittheiruseinavariety of repair scenarios and environ
26、ments. 6.2 This specication denes those characteristics that are required of adhesives to be used in the repair of sandwich panels for durable, rigidwall, relocatable structures. 7. Test Methods 7.1 PreparationofTestSpecimensTheadherendsshallbeeither6061T6or5052H34aluminumalloy(FederalSpecications Q
27、Q-A-250/11d or QQ-A-250/8d, respectively, or Specication B209) and shall be cleaned as prescribed in Practice E864. 7.2 ApparatusThetestingmachineshallconformtotherequirementsofPracticesE4.Theloadrangeshallbeselectedsothat the maximum loads for each type of test conducted falls between 15 and 85% of
28、 the full-scale capacity.Autographic equipment, or equipment that will produce equivalent accuracy, shall be used to record loads. TABLE 1 Tensile Lap Shear (Test Method D1002) Test Condition A Number of Specimens to be Tested Average Must Ex- ceed Minimum Must Ex- ceed B C (F) MPa (psi) MPa (psi) 5
29、4 3 (65 5) 6 13.8 (2000) 11.7 (1700) 23 3 (73 5) 6 17.9 (2600) 15.2 (2200) 60 3 (140 5) 6 16.5 (2400) 14.1 (2050) 93 3 (199 5) 6 10.3 (1500) 8.6 (1250) 60 3 (140 5) 6 8.3 (1200) 7.0 (1020) A After30dayexposureto60 3C(140 5F)and95to100 %relativehumidity. B All specimens tested must exceed these minim
30、um values. E155512 27.3 Lap-Shear StrengthThe lap shear tests shall be performed in accordance with Test Method D1002 and at the test conditions listed in Table 1. In all tests the test chamber shall be stabilized at the test temperature for 45 min prior to the test and before the specimens are plac
31、ed in it. 7.3.1 Reduced and Elevated Temperature TestsFor the test to be conducted on specimens that have not been humidity-aged, bring the specimens to the test temperature, as indicated by a thermocouple at the bond area, and stabilize for 10 min just prior to test. 7.3.2 Elevated Temperature Test
32、 after Humidity AgingThe specimen shall be maintained in the humid environment until immediately before insertion into the test chamber. The specimen shall be inserted into the test chamber and the chamber temperature returned to the test temperature as rapidly as possible to minimize specimen dryou
33、t. Based on the thermocouple located at the bond area, commence the test 2 min after the thermocouple returns to the test temperature. 7.4 Flatwise Tensile StrengthSandwich specimens shall be prepared using nonmetallic honeycomb core meeting the requirements of Specication E1091, Type IV. The specim
34、ens shall have an area of 58 cm 2 (9 in. 2 ) and be tested in accordance with the requirements in MIL-STD-401. The facing skins shall be a minimum of 0.51 mm (0.020 in.) thick. The adhesive layer between the facing skins and the honeycomb core shall be uniformly applied at a rate of 0.0488 gm/cm 2 (
35、0.1 lb/ft 2 ). 7.4.1 Reduced and Elevated Temperature TestsStabilize the chamber used to test the specimens at the test temperature for 45 min prior to the test and before the specimens are placed in it. Bring the specimens to the required test temperature, as indicated by a thermocouple at the bond
36、 area, and stabilize for 10 min just prior to test. 7.5 Climbing Drum Peel StrengthSandwich specimens shall be prepared using nonmetallic honeycomb core meeting the requirements of Specication E1091, Type IV. The specimens shall be of the dimensions specied and tested in accordance with the requirem
37、ents in Test Method D1781. The peeling face skin shall be 6061 T6 (QQ-A-250/11d) or 5052 H34 (QQ-A-250/8d) aluminum alloy, 0.51 mm (0.020 in.) thick. The adhesive is to be uniformly applied on each skin of the sandwich construction at a rate of 0.0488 gm/cm 2 (0.1 lb/ft 2 ). 7.5.1 Reduced and Elevat
38、ed Temperature TestsRepeat 6.4.17.4.1. 7.6 Dead Load Stress DurabilityTest the specimens in accordance with Test Method D2919. Maintain the conditions of the test chamber at 606 3C (1406 5.4F) and 95 to 100% relative humidity. 7.7 SagSag shall be dened as the average length of the adhesive ow line m
39、axima down a vertical plate when tested at 23 6 3C (73.96 5.4F) in the manner described below. 7.7.1 Materials RequiredThe following materials are required to carry out the sag test: 7.7.1.1 Aluminum test panel conforming to dimensions shown in Fig. 1a, solvent cleaned, and having lightly scribed li
40、nes located as shown in Fig. 1a, TABLE 2 Flatwise Tension (Specication E1091) Test Condition Number of Speci- mens to be Tested Average Must Exceed Minimum Must Ex- ceed A C (F) MPa (psi) MPa (psi) 54 3 (65 5) 6 2.11 (306) 1.79 (260) 23 3 (73 5) 6 2.11 (306) 1.79 (260) 60 3 (140 5) 6 1.56 (226) 1.33
41、 (192) A All specimens tested must exceed these minimum values. TABLE 3 Climbing Drum Peel (Test Method D1781) Test Condition Number of Specimens to be Tested Average Must Exceed Minimum Must Ex- ceed A C (F) N-m/m (in.-lb/in.) N-m/m (in.-lb/in.) 54 3 (65 5) 6 18 (4.04) 15.3 (3.4) 23 3 (73 5) 6 36 (
42、8.08) 30.6 (6.8) 60 3 (140 5) 6 24 (6.06) 22.7 (5.1) A All specimens tested must exceed these minimum values. TABLE 4 Durability Test (Test Method D2919) Test Condition Number of Specimens to be Tested Applied Stress Average Time to Failure to Exceed MPa (psi) 60 3C (140 5F) and 95 to 100 % R.H. 6 6
43、 8.3 11.0 (1200) (1600) 400 h 50 h E155512 37.7.1.2 Aluminum screeding templates, conforming to dimensions shown in Fig. 2, and 7.7.1.3 Notched rack to hold test panels in vertical position. 7.7.2 Application ofAdhesive to Test PanelUsingasuitableapplicator,apply3goffreshlymixedadhesivetotherectangu
44、lar area of the aluminum test panel outlined by the light scribe lines. Spread this uniformly over the rectangular area, ensuring that theadhesiveextendstoorslightlybeyondtheedgesoftherectangle.Avoidincorporatingvoidsintothisadhesivetestpatch.Draw the vertical screeding template, illustrated in Fig.
45、 2b, across the length of the test panel one time in a bottom to top direction.The purpose of this is to leave an adhesive test patch with uniform thickness and well-dened side edges. If adhesive smears are left on the test panel after this step, these shall be ignored as long as the side edges of t
46、he test patch are well-dened. When required to generate well-dened edges, this step shall be repeated a second time. Next draw the horizontal screeding template, illustrated in Fig. 2a, across the width of the test panel one time.The purpose of this is to establish well-dened upper and lower edges w
47、ith as little, and preferably no, adhesive left on the test panel below the scribe line. Perform this one time, ignoring any adhesive that has been pulled off the exit side of the adhesive test patch. Do not use solvent to clean adhesive smears off of the test panel, since this will inuence sag. (a)
48、 Clean, scribed aluminum test panel, 1.27 mm (0.050 in.) or greater thick- ness. (b) Test panel with pre- pared test patch of ad- hesive. (a) Clean, scribed aluminum test panel, 1.27 mm (0.050 in.) or greater thick- ness. (b) Test panel with pre- pared test patch of ad- hesive. (c) Flow pattern with
49、 three ow line maximas. (d) Flow pattern with one ow line maxima. FIG. 1 Illustration of Sag Test Specimen E155512 47.7.3 TestPlace the test panel in a notched rack capable of holding the test panel in a vertical position (to within 2 of true vertical). The notched rack shall not interfere with ow of the adhesive down the test panel. A satisfactory rack has been made from metal channel. Maintain the test panel in the vertical position at 236 3C (73.46 5.4F) until the adhesive
