1、 ISO 2017 Glass reinforced thermosetting plastic (GRP) pipes Determination of initial specific ring stiffness using segment test species cut from a pipe Tubes en plastique thermodurcissables renforcs de verre (PRV) Dtermination de la rigidit annulaire spcifique initiale et de la rsistance la dflexio
2、n annulaire initiale en utilisant des prouvettes segmentaires dcoupes dans un tube TECHNICAL SPECIFICATION ISO/TS 12512 Reference number ISO/TS 12512:2017(E) First edition 2017-07 ISO/TS 12512:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All
3、rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested fro
4、m either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/TS 12512:2017(E)Foreword iv Introduction v 1 Scope .
5、 1 2 Normative references 1 3 Terms and definitions . 1 4 Principle 4 4.1 Overview 4 4.2 Principle of test procedures to determine initial specific ring stiffness 4 4.2.1 Method A . 4 4.2.2 Method B . 4 5 Apparatus . 4 5.2 Load application surface General arrangement 5 5.3 Dimension-measuring instru
6、ments 5 5.4 Temperature-measuring instrument . 5 6 Test pieces . 6 6.1 Preparation 6 6.2 Number 6 6.3 Determination of dimensions 6 6.3.1 Width . 6 6.3.2 Wall thickness 7 6.3.3 Mean diameter . 7 7 Conditioning 7 8 Procedure. 7 8.1 Test temperature . 7 8.2 Positioning of the test piece . 7 8.3 Determ
7、ination of initial specific ring stiffness 7 8.3.1 Method A: Using constant load 8 8.3.2 Method B: Using constant deflection .10 9 Calculations.11 10 Test report 12 Annex A (informative) Principles forming basis for use of segmental test pieces 13 ISO 2017 All rights reserved iii Contents Page ISO/T
8、S 12512:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subje
9、ct for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC
10、) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be n
11、oted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identi
12、fying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents). Any trade name used in this document is information given for the conve
13、nience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Tec
14、hnical Barriers to Trade (TBT) see the following URL: w w w . i s o .org/ iso/ foreword .html. This document was prepared by ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, SC 6, Reinforced plastics pipes and fittings for all applications.iv ISO 2017 All rights reserved
15、ISO/TS 12512:2017(E) Introduction This document develops an alternative to the testing of full pipe rings to measure initial specific ring stiffness (ISO 7685). The goal was to use ring segments which ideally would have led to the use of smaller and more easily handled test specimens and standard te
16、sting machines. Much work was done on developing equipment for testing ring segments and on the analysis of loading conditions and calculation procedures and conducting testing programs. There was neither sufficient nor uniform correlation of segment testing results to standard ring testing results
17、to allow the use of segment testing as an alternative stiffness test procedure. There were indications that correlation was perhaps diameter (DN), stiffness class (SN) and pressure class (PN), as well as specimen width, dependent. As initial ring stiffness (SN) is a key classification parameter for
18、GRP pipes this resulted in the segment test being not accepted as a viable alternative stiffness testing procedure. This document presents the last draft of the segment test method. It was agreed to issue this last draft as a Technical Specification so that the work done would not be lost and perhap
19、s will allow interested parties to continue to develop the analysis of loading conditions, equipment development and calculation procedures. It may also prove useful as a research tool. ISO 2017 All rights reserved v Glass reinforced thermosetting plastic (GRP) pipes Determination of initial specifi
20、c ring stiffness using segment test species cut from a pipe 1 Scope This document specifies a method for determining the initial specific ring stiffness of pipes having a nominal size of DN 2000 or larger, using segment test pieces cut from a glass-reinforced thermosetting plastics (GRP) pipe. 2 Nor
21、mative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7685, Plastics piping syste
22、ms Glass-reinforced thermosetting plastics (GRP) pipes Determination of initial specific ring stiffness 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addr
23、esses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp 3.1 compressive load F load applied to a pipe to cause a diametric deflection Note 1 to entry: Compressive load is expressed in newtons (N). 3.2 load appl
24、ied to 79 segmental test piece F 79 load applied to 79 segmental test piece to cause deflection Note 1 to entry: Load applied to 79 segmental test piece is expressed in newtons (N). 3.3 deflection coefficient applied to 79 segmental test piece coefficient given by Formula (1): (1) where TECHNICAL SP
25、ECIFICATION ISO/TS 12512:2017(E) ISO 2017 All rights reserved 1 ISO/TS 12512:2017(E)y s is the vertical deflection of the pipe ring derived from the 79 pipe segment (see 3.7);d m is the mean diameter of the pipe ring (see 3.8). Note 1 to entry: Deflection coefficient applied to 79 segmental test pie
26、ce is a dimensionless number. 3.4 vertical deflection y vertical change in diameter of a pipe in a horizontal position in response to a vertical compressive load (3.1) Note 1 to entry: Vertical deflection is expressed in metres (m). 3.5 relative vertical deflection y/d m ratio of the vertical deflec
27、tion (3.4) of a pipe, y, to its mean diameter, d m(3.8) Note 1 to entry: Relative vertical deflection when multiplied by 100 is expressed in percent (%). Otherwise it is a dimensionless number. 3.6 derived vertical deflection of pipe segment y d vertical deflection of the pipe segment, using Formula
28、 (2), which is derived by finite element analysis of a pipe ring and which results in the same loading conditions as if the pipe segment were part of a pipe ring deflected by the vertical deflection y yy (2) where 79is the conversion factor for 79 segment test piece determined by finite element anal
29、ysis (see Table 1). Note 1 to entry: Derived vertical deflection is expressed in metres (m). 3.7 vertical deflection of pipe ring y sderived from 79 pipe segment test ratio of the vertical deflection of a pipe ring, to the derived vertical deflection of a 79 pipe segment taken from the same pipe, wh
30、en the same deflection force is applied to each unit is given by the following formula: yy (3) wherey s is the vertical deflection of pipe ring;y d is the derived vertical deflection of 79 segment. 3.8 mean diameter d m diameter of the circle corresponding with the middle of the pipe wall cross-sect
31、ion It is given by either Formula (4) or (5): (4)2 ISO 2017 All rights reserved ISO/TS 12512:2017(E) (5) whered i is the average of the measured internal diameters (see 6.3.3);d e is the average of the measured external diameters (see 6.3.3);e is the average of the measured wall thicknesses of the p
32、ipe (see 6.3.2). Note 1 to entry: Mean diameter is expressed in metres (m) when the wall thickness and diameters are measured in metres (m). 3.9 specific ring stiffness S physical characteristic of the pipe, which is a measure of the resistance to ring deflection under external load Note 1 to entry:
33、 Specific ring stiffness is determined by testing and is defined, in newtons per square metre (N/m 2 ), by Formula (6): (6) whereE is the apparent modulus of elasticity as determined in the ring stiffness test, expressed in new - tons per square metre (N/m 2 );d m is the mean diameter (3.8) of the t
34、est piece, in metres; is the second moment of area in the longitudinal direction per metre length, expressed in metres to the fourth power per metre, i.e. (7) where e is the wall thickness of the test piece, in metres. 3.10 initial specific ring stiffness S 0 initial value of S obtained by testing i
35、n accordance with this document. Note 1 to entry: Initial specific ring stiffness is expressed in newtons per square metre (N/m 2 ). 3.13 average width of 79 segmental test piece b average of three measurements taken at specified locations on the segment test piece (see 6.1 and 6.3.1) Note 1 to entr
36、y: Average width is expressed in metres (m). 3.14 load correction factor factor applied to the measured deflection load F 79applied to a 79 segment during test (8) ISO 2017 All rights reserved 3 ISO/TS 12512:2017(E) whered m is the mean diameter (see 3.8) of the test piece, in metres;e is the wall t
37、hickness of the test piece, in metres Note 1 to entry: This compensates for the supports being placed at segment the edges instead of centre of segment edges 4 Principle 4.1 Overview To overcome problems with the size of the testing equipment and test pieces, when using full rings of large diameter
38、pipes to determine the initial stiffness, the test procedures described in this document have been developed using 79 segments taken from full rings of pipe. Using formulae given in the document, the required deflection, to be applied to the segment, is determined which ensures that the test piece w
39、ill be subject to the same level of strain as a full ring test piece when testing in accordance with ISO 7685. 4.2 Principle of test procedures to determine initial specific ring stiffness A segment of pipe is loaded across its width to deflect it vertically. Two ways are given for doing this: metho
40、d A (constant load) and method B (constant deflection), either of which can be used. 4.2.1 Method A A load is applied to a segment test piece to give a deflection equal to the segments deflection when considered as part of a full ring which is deflected to (3 0,5) % in accordance with ISO 7685. The
41、load is kept constant for a specified period of time and the final deflection is determined at the end of this period. 4.2.2 Method B A load is applied to a segment test piece to give a deflection equal to the segments deflection when considered as part of a full ring which is deflected to (3 0,5) %
42、 in accordance with ISO 7685. The deflection is kept constant for a specified period of time and at the end of this period the final load being applied is determined. It is assumed that the following test parameters specified in this Test Method will be either accepted or restated in any Internation
43、al Standard referring to this Test Method: a) the method to be used (A or B); b) the width of the test pieces (see 6.1); c) the number of test pieces (see 6.2); d) if applicable, the details of conditioning of the test pieces (see Clause 7). 5 Apparatus 5.1 Compressive-loading machine, comprising a
44、system capable of applying, without shock, a compressive force, F, (suitable for the applicable test method described in Clause 4) at a controlled rate through a load application surface conforming to 5.2 so that a horizontally orientated segmental test piece conforming to Clause 6 can be deflected
45、vertically. The accuracy of loading shall be within 1 % of the maximum indicated load.4 ISO 2017 All rights reserved ISO/TS 12512:2017(E) 5.2 Load application surface General arrangement The surface shall be provided by a plate (see 5.2.1), or a beam bar (see 5.2.2), with their major axis perpendicu
46、lar to and centred on the direction of application of the load, F, by the compressive-loading machine, as shown in Figures 1 and 2. The surfaces in contact with the test piece shall be flat, smooth, clean and parallel. A plate or beam bar shall have a length at least equal to the width of the test p
47、iece (see Clause 6) and a thickness such that visible deformation does not occur during the test. 5.2.1 Plate, shall have a width of at least 100 mm. 5.2.2 Beam bar, shall have rounded edges, a flat face (see Figure 1) without sharp edges and a width of 50 mm 5 mm. The beam bars shall be designed an
48、d supported such that no other surface of the beam bar structure comes into contact with the test piece during the test. 5.3 Dimension-measuring instruments Capable of determining: the necessary dimensions (length, width, diameter, wall thickness) to an accuracy of within 0,1 mm; the deflection of t
49、he test piece in the vertical direction to an accuracy of within 1,0 % of the maximum value. 5.4 Temperature-measuring instrument If applicable, capable of verifying conformity to the specified test temperature (see 8.1). ISO 2017 All rights reserved 5 ISO/TS 12512:2017(E) Key (a) load application using plate 5 wheel, four per sledge (b) load application us
