1、STD-AECMA PREN 3LOL-ENGL 1777 LOL2311 OOLL307 LLB I I I I aecrna 1997 AECMA STANDARD NORME AECMA AECMA NORM I prEN 3101 Edition P 1 April 1997 Edition approved for publication PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 6-1 200 BRUXELLES - Tel. (32) 2 775 81
2、 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : C7 Chairman Comments should be sent within six months after the date of publication to ENGLISH VERSION Aerospace series Non-metallic materials Sealants Test method Determination of resistance to thermal rupture Srie arospatiale Matriaux non-mtalliques
3、Produits dtanchit Mthode dessai Dtermination de la rsistance la rupture thermique Luft- und Raumfahrt Nichtmetallische Werkstoffe Dichtmassen Prfverfahren Bestimmung der Warmbruchbestndigkeit This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Associ
4、ation of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shal
5、l not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submi
6、tted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. 1997-04-30 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Wright STD.AECMA PREN 3LOL-ENGL 1997 LOL23LL OOLL308 05q M Page 3 Previous page is blank prEN 3101 : 1997 1 Scope This standard defines a test method
7、for the determination of the resistance to thermal rupture of sealants. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are lis
8、ted hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 2768-1 General toleranc
9、es - Part 1 : Tolerances for linear and angular dimensions without IS0 2768-2 General tolerances - Part 2 : Geometrical tolerances for features without individual individual tolerance indications tolerance indications Aerospace series - Aluminium alloy 2024-T3 clad sheet and strip - 0,4 5 a I 6 mm 1
10、) Aerospace series - Polysulphide sealants, two-component - Technical specification 2) EN 2090 EN 3624 3 Definition For the purposes of this standard, the following definition applies : Resistance to thermal rupture : assessment of a sealant sample with respect to changes such as cracks and the meas
11、urement of any permanent deformation, after the application of pressure at elevated temperature. It is determined by testing a set of test pieces directly after curing and another set of test pieces after immersion in defined test fluids. 4 Test fluids The applicable test fluid shall be the referenc
12、e test fluid no 1 in accordance with EN 3624, unless otherwise specified in the material standard. 5 Apparatus 5.1 Test containers The test containers shall be made of material resistant to the test fluids and having no catalytic effect (e.g. they shall not contain any copper), preferably glass. The
13、 size of the container shall be such that it can hold the amount of test fluid specified in 7.1 and that the amount of air remaining above the test fluid is kept to a minimum. The containers shall be sufficiently airtight to avoid any interchange with the surrounding air. 5.1 .I For unpressurized im
14、mersion in fluids which show no appreciable evaporation or moisture absorption at testing temperature, containers with an attached lid can be used. No exchange of air (entry of surrounding air) shall be permitted. 5.1.2 For immersion in volatile or moisture-sensitive fluids at ambient temperature, c
15、ontainers which shall be tightly closed, e.g. with a ground stopper, shall be used. 1) Published as AECMA Standard at the date of publication of this standard 2) Published as AECMA Prestandard at the date of publication of this standard STD*AECMA PREN 31OL-ENGL 1977 = LO22311 0011307 T70 W Page 4 pr
16、EN 3101 : 1997 5.1.3 If evaporation of the test fluid is expected, e.g. in the case of fluids with high vapour pressure or at high temperatures, tightly fitting containers, e.g. with ground stoppers, and fitted with a backflow shall be used. The condensors shall be shut off from the atmosphere by me
17、ans of a simple flow valve or a dry tube. 5.1.4 containers complying with the relevant safety regulations shall be agreed upon. When using dangerous fluids and gases and when testing under pressure, appropriate test 5.2 Support of test pieces For the support of test pieces, use materials having no c
18、atalytic effect and resisting to the test fluid. The support shall ensure that the test pieces are exposed to the test fluid on all sides. 5.3 Temperature regulated equipment Heat sources shall be capable of achieving and controlling at the temperatures specified in table 1 and those used in the mat
19、erial standards. Heating cabinets, for example, are suitable for this purpose, according to the test fluids used. In the case of highly volatile test fluids or low explosion limits, only explosion-shielded heat sources or steam heated fluid baths located in an explosion-shielded room shall be used.
20、5.4 Test fixture The configuration and dimensions of the test fixture shall be conform to figure 1. It shall preferably be made of stainless steel. Other test fixtures yielding equivalent test results are permitted. Page 5 prEN 3101 : 1997 A-A Dimensions in mrn 7 r Handwheel - Test panel - Disk of s
21、ealant 50 and 3 thick I 1 Test chamber 5 Pressure gauge line Air supply line Bead Figure 1 : Test fixture General tolerances according to IS0 2768 - medium STD-AECMA PREN 3101-ENGL 1777 1012311 OOL13Ll b1i7 U Page 6 prEN 3101 : 1997 6 Test pieces Test pieces shall be prepared from an aluminium alloy
22、 test panel and sealant. The panel shall be cleaned with organic solvent before applying the sealant. 6. I Shape and preparation The panel made of material EN 2090 shall be (1,6 x 90 x 90 1 mm in size with a hole of 6 mm in its centre. The hole shall be filled with a sealing plug of non-adherent mat
23、erial, e.g. PTFE, flush with the panel surface. Then a disk of sealant (3 k 0,4) mm thick and 50 mm in diameter shall be deposited (see figure 2). sealant test panel Figure 2 : Preparation of test piece, diagrammatic Unless otherwise specified in the material standard, the test pieces shall be cured
24、 for 14 d at (23 i: 2) OC and (50 f 5) % relative humidity. The plug shall be removed after curing. 6.2 Number The number of test pieces to be tested is specified in the relevant technical specification, but shall be at least 6. Only half of the number of test pieces shall be immersed in the test fl
25、uid, the other half being tested directly after curing. 7 Exposure conditions 7.1 Quantity of test fluid The volume of test fluid shall be at least 15 times that of the test pieces. The test fluid shall surround the test pieces on all sides by at least 20 mm. Any change of the test fluid through age
26、ing and interaction with the test pieces shall be taken into account. If the test fluid contains limited quantities of aggressive components or if the test fluid should be considerably changed during the operation by emission or absorption of substances, then the precise quantity of the test fluid a
27、nd interval for its replacement shall be stipulated. STDmAECMA PREN 3LflL-ENGL 1777 LOL23LL OOL13L2 585 Page 7 prEN 3101 : 1997 Temperatures Times OC h Method F 7.2 Exposure times and temperatures The exposure times and temperatures are specified in table 1. A Table 1 : Immersion conditions 60 * 1 1
28、68 f 2 120 f 2 60 t 1 7.3 Immersion in test fluid After identification marking, the test pieces shall be immersed in the test fluid according to 4 in a container meeting the requirements of 5.1, so that they are placed with adequate protection against light and accessible to the test fluid on all si
29、des, not touching each other and the container walls, preferably hanging in the test container. The quantity of test fluid used shall be in accordance with 7.1. For each immersion unused fluid shall be used. Immerse only test pieces of one sealant type in each container. The test pieces shall be bro
30、ught to temperature after immersion. With regard to the renewal of the test fluid during immersion see 7.1. At the end of the exposure time the test pieces shall be taken out of the test fluid and any excess fluid remaining on the test pieces shall be removed according to 7.4. 7.4 Removal of adherin
31、g test fluid Immediately after completion of the immersion in the test fluid, the adhering fluid shall be carefully removed as follows : a) For low-volatile fluids the test pieces shall be dried with non-fraying, absorbent cellulose paper. If required, they shall also be rinsed with an inert, highly
32、 volatile solvent and dried with cellulose paper. For high-volatile fluids, evaporation in air shall be usually sufficient (no longer than ?O s). b) 8 Procedure Immerse half of the test pieces prepared as specified in 6, according to the method prescribed in the material standard, see table1 . Immed
33、iately afterwards, install them in the test fixture of figure 1 using appropriate sealing. The test pieces shall be fixed in the test fixture in such a way that the sealant disk is inside the test chamber. Transfer the test fixture into a hot cabinet set to the temperature stated in the material sta
34、ndard. Apply a pressure of 0,07 MPa through the air supply line fitted with a pressure regulator. After application of the pressure, maintain the test fixture together with the test pieces in the hot cabinet as specified in the material standard. To check the other half of the test pieces not subjec
35、t to fluid immersion, only the temperature/pressure testing shall be carried out as prescribed. STD-AECMA PREN 3101-ENGL 1777 W LOL23LL CIOLL313 qLL Page 8 prEN 3101 : 1997 9 Assessment 9.1 Visible changes A visual assessment shall be made of how the sealant surface of the test pieces subjected to f
36、luid immersion, or not, has changed after temperature/pressure testing, e.g. discolouration, cracking. 9.2 Measurable changes After removal of the test pieces from the test fixture, see figure 1, the deformation shall be measured and compared with the indications of the material standard. 1 O Design
37、ation EXAMPLE : Number of this standard Method of exposure (see table 1) 11 Test report The following information shall be provided in the test report with reference to this standard : reference to this standard ; type, description of product tested ; thickness of sealant disk ; curing conditions ; test fluid ; temperature(s1 and tirne(s) of immersion in test fluid ; drying and cleaning conditions ; test conditions (time, temperature, pressure) ; visible changes of the test piece ; deformation of test piece ; any deviation from this standard in detail ; test date.
