1、BRITISH STANDARD BS 5350-G2: 1987 Methods of test for Adhesives Part G2: Determination of static shear strength of anaerobic adhesives UDC 665.93:620.179.4:620.176.24BS5350-G2:1987 This British Standard, having been prepared under the directionof the Adhesives Standards Committee, was published unde
2、r the authority ofthe Board of BSI and comes into effect on 27February1987 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ADC/9 Draft for comment85/54562 DC ISBN 0 580 15625 7 Foreword This Part of BS 5350 has been prepared under the direction of th
3、e Adhesives Standards Committee. Group G comprises several test methods chiefly intended for the assessment of the performance characteristics of anaerobic adhesives used primarily in mechanical engineering. They can also form part of a programme of assessment of the behaviour of anaerobic adhesives
4、 under a variety of environmental conditions. The method in this Part is based on a procedure in Aerospace Material Specification DTD5628 “Test methods and procurement procedures for one-part anaerobic polymerisable compounds for locking, sealing and retaining”, issued by the Procurement Executive o
5、f the Ministry of Defence. WARNING NOTE. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and
6、safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Thi
7、s document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendment
8、s issued since publication Amd. No. Date of issue CommentsBS5350-G2:1987 BSI 09-1999 i Contents Page Foreword Inside front cover 0 Introduction 1 1 Scope 1 2 Definitions 1 3 Principle 1 4 Supplementary information 1 5 Apparatus and materials 1 6 Test pieces 1 7 Procedure 2 8 Expression of results 2
9、9 Test report 2 Figure 1 Jig for holding test piece on compression test machine 3 Figure 2 Adaptor for compression testing on tensile test machines 4 Figure 3 Test pieces positioned for curing 5 Figure 4 Collar and pin adherends 6 Figure 5 Example of force v. time curve 7 Publications referred to In
10、side back coverii blankBS5350-G2:1987 BSI 09-1999 1 0 Introduction Anaerobic adhesives are widely used as a means of securing engineering components. The strength of such bonds can be assessed by determining the static shear strength of a specified joint after curing under specified conditions. The
11、test does not necessarily represent the performance of the material in service. A range of material strengths is required to meet various design purposes. 1 Scope This Part of BS 5350 describes a method for the determination of the static shear strength of anaerobic adhesives. It is applicable to an
12、aerobic adhesives capable of polymerizing on a steel surface in the absence of air (oxygen). The primary aim of this test is for ranking and quality control of anaerobic adhesives and reliance should not be placed on any test results for design purposes. Design data should preferably be obtained fro
13、m tests using the construction materials and configurations used in the actual design. This test may be used for quality control of types of adhesives other than anaerobic, if considered suitable, provided that the curing conditions are defined. NOTEThe titles of the publications referred to in this
14、 Part of BS5350 are listed on inside back cover. 2 Definitions For the purposes of this Part of BS5350, the following definitions apply. 2.1 anaerobic adhesive an adhesive that cures spontaneously in the absence of oxygen, curing being inhibited by the presence of oxygen and catalysed by metal ions
15、2.2 static shear strength the force required to rupture a coaxial joint of given dimensions under specified conditions by a force applied along the major axis 3 Principle The adhesive under test is used to lock a specified collar and pin together. The force required to rupture the coaxial joint is t
16、hen measured. The increasing force is applied either directly by a machine operating at a constant crosshead speed in compression mode or indirectly by a tensile test machine, in which case an adaptor is required. 4 Supplementary information This method of test requires the following supplementary i
17、nformation, which shall be stated when this method is specified. a) Curing conditions, other than those described in6.4.2, if required for evaluating the adhesive in special circumstances. b) Details of the conditioning atmosphere and conditioning period. 5 Apparatus and materials 5.1 Shallow non-me
18、tallic dish of sufficient capacity to enable the pin and collar to be immersed in the adhesive under test. 5.2 Compression or tensile test machine complying with grade B of BS5214-1. It shall be capable of providing a constant crosshead speed which can be set to a value that will achieve the require
19、d time to failure (see clause7). It shall also be equipped with a facility for autographic recording. 5.3 Adaptor or jig to hold test pieces and to ensure that a compressive load is applied along the major axis of the test piece. For use with a compression test machine, the jig shall be a rigid cyli
20、nder with parallel faces and a clearance hole for the pin (seeFigure 1). For use with a tensile test machine, a compression cage is required to reverse the direction in which the force is applied (seeFigure 2). 5.4 Cabinet, capable of being controlled at23 2 C, and a chamber, if required for providi
21、ng the conditioning atmosphere. 5.5 Tweezers, tongs or disposable gloves, for handling treated components. 5.6 1,1,1-trichloroethane, complying with BS4487. 5.7 Polyethylene sheets 6 Test pieces 6.1 General Each test piece shall consist of a bonded assembly of either: a) one collar and one pin seeFi
22、gure 3(a); b) two collars and one pin seeFigure 3(b). The collars and pins shall comply with6.2 and be prepared in accordance with6.3. 6.2 Adherends 6.2.1 General. The collars and pins shall be so matched that the diametrical clearance is0.025mm to0.050mm.BS5350-G2:1987 2 BSI 09-1999 6.2.2 Collars 1
23、) . The collars shall be made of low carbon steel220M07 complying with BS970-1, and shall have the dimensions shown inFigure 4. 6.2.3 Pins 1) . The pins shall be made of low carbon steel220M07 complying with BS970-1, and shall have the dimensions shown inFigure 4. 6.2.4 Machining. The collars and pi
24、ns shall have been machined using a cutting oil which does not contain lanolin and which is soluble at room temperature in 1,1,1-trichloroethane (5.6). 6.3 Preparation of components of test pieces Select the number of collars and pins in accordance with6.5. Wash the collars and pins in the 1,1,1-tri
25、chloroethane (5.6) at least three times to degrease them, using a fresh portion of solvent each time and allow them to dry. NOTEOther more thorough methods of degreasing with another solvent may be used, but are not essential to the method. Any solvent used should not leave any residue on the surfac
26、e that is detectable on visual inspection. Allow the collars and pins to attain23 2 C before proceeding further and take precautions to avoid contamination in subsequent handling (see5.5). If preparation of the adhesive is necessary, carry this out in accordance with the manufacturers instructions.
27、Ensure that the adhesive has attained23 2 C. 6.4 Preparation of test pieces 6.4.1 Assembly. Fill the shallow non-metallic dish(5.1) with the adhesive under test to a depth of at least15mm and ensure that any air bubbles present are as completely dispersed as is practicable before proceeding further.
28、 Immerse each set of collar(s) and pin in the adhesive. Then insert the immersed pin into the immersed collar(s) and lift the pin and collar(s) clear of the liquid while sliding the pin into the collar(s) to provide an assembly as shown inFigure 3(a) orFigure 3(b), as appropriate. To avoid the possi
29、bility of cross-contamination (see2.1 and6.2.4), use a fresh portion of the adhesive for each test piece. 6.4.2 Curing and conditioning. Place test pieces comprising one collar and one pin on a sheet of polyethylene (5.7) with the pin vertical. Support the collar approximately at the mid-point of th
30、e pin using suitable means, e.g.pieces of polyethylene seeFigure 3(a). Place test pieces comprising two collars and one pin on a polyethylene sheet with the pin horizontal seeFigure 3(b). Place the test pieces on another sheet of polyethylene, ensuring that they do not touch. Then transfer them to t
31、he cabinet (5.4) and maintain at23 2 C, unless otherwise specified see item a) of clause4. At the expiry of the curing period, remove the test pieces from the cabinet and remove excess uncured material from their surfaces. Then test them in accordance with clause7, after conditioning, if required se
32、e item b) of clause4. 6.5 Number of test pieces For sets consisting of one collar and one pin, six test pieces shall be used. For sets consisting of two collars on each pin, three test pieces shall be used. The bond between each collar and pin shall be tested once only. Once tested, adherends shall
33、not be re-used. 7 Procedure Locate each test piece in the compression or tensile test machine (5.2), using the jig or adaptor respectively. Apply a force to the pin at a constant crosshead speed such that the failure occurs20s to90s after commencement of loading. Record for each test piece the force
34、, in newtons, corresponding to the failure point, as follows. a) If the failure is sudden, as is usual, the failure point corresponds to the maximum force reached before failure. b) If, alternatively, the failure is gradual, as happens occasionally, the failure point corresponds to the force at whic
35、h the rate of loading first decreases (seeFigure 5). 8 Expression of results Calculate the mean value, in newtons, of the force at the point of failure, and express it as the mean static shear strength. Also, calculate the standard deviation (see BS5350-E1). 9 Test report The report shall state the
36、following: a) a designation of the adhesive, giving all information required for complete identification of the sample; b) the items of supplementary information given in clause4; c) the mean static shear strength and its standard deviation, in newtons; d) that the method of test was conducted in ac
37、cordance with this Part of BS5350 or, if it was not, deviations from the method. 1) For information on the availability of suitable collars and pins, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes, MK14 6LE, enclosing a stamped addressed envelope for reply.BS5350-G2:1987 BSI 09-1999 3 Fi
38、gure 1 Jig for holding test piece on compression test machineBS5350-G2:1987 4 BSI 09-1999 Figure 2 Adaptor for compression testing on tensile test machinesBS5350-G2:1987 BSI 09-1999 5 Figure 3 Test pieces positioned for curingBS5350-G2:1987 6 BSI 09-1999 Figure 4 Collar and pin adherendsBS5350-G2:19
39、87 BSI 09-1999 7 Figure 5 Example of force v. time curve8 blankBS5350-G2:1987 BSI 09-1999 Publications referred to BS 970, Specification for wrought steels for mechanical and allied engineering purposes. BS 970-1, General inspection and testing procedures and specific requirements for carbon, carbon
40、 manganese, alloy and stainless steels. BS 4487, Inhibited 1,1,1-trichloroethane (methylchloroform). BS 5214, Testing machines for rubbers and plastics. BS 5214-1, Tensile, flexural and compression machines. BS 5350, Methods of test for adhesives. BS 5350-E1, Guide to statistical analysis. Aerospace
41、 Material Specification DTD5628 Test methods and procurement procedures for one-part anaerobic polymerisable compounds for locking, sealing and retaining. Procurement Executive, Ministry of Defence 2) . 2) Referred to in the foreword only and available from HMSO,49 High Holborn, London WC1 for perso
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