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 ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this
3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J343_201712 SURFACE VEHICLE STANDARD J343 DEC2017 Issued 1968-06 Reaffirmed 1986-05 Revised 20
5、17-12 Superseding J343 MAY2016 Test and Test Procedures for SAE 100R Series Hydraulic Hose and Hose Assemblies RATIONALE The pressure impulse wave forms for the high pressure and low-pressure tests in Figures 2 and 3 were inconsistent and the support notes were presented differently. This was the sa
6、me situation in ISO 6605 and was corrected in the latest version - ISO 6605:2017. The pressure impulse wave forms for the high pressure and low-pressure tests in Figures 2 and 3 were redrawn and a key was added along with supporting notes. FOREWORD SAE J343 has been revised to be technically equival
7、ent to ISO 6605, except that additional tests in 4.9 to 4.14 were included. 1. SCOPE This SAE Standard gives methods for testing and evaluating performance of the SAE 100R series of hydraulic hose and hose assemblies (hose and attached end fittings) used in hydraulic fluid power systems. Specific te
8、sts and performance criteria for evaluating hose assemblies used in hydraulic service are in accordance with the requirements for hose in the respective specifications of SAE J517. This document further establishes a uniform means of testing and evaluating performance of hydraulic hose assemblies. S
9、AE INTERNATIONAL J343 DEC2017 Page 2 of 10 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE Intern
10、ational, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J517 Hydraulic Hose 2.1.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-29
11、59, Tel: 610-832-9585, www.astm.org. ASTM D380 Standard Methods of Testing Rubber Hose ASTM D5964 07 Standard Practice for Rubber IRM 901, IRM 902, and IRM 903 Replacement Oils for ASTM No. 1, ASTM No. 2, and ASTM No. 3 Oils 2.1.3 ISO Publications Copies of these documents are available online at ht
12、tp:/webstore.ansi.org/ ISO 3448 Industrial liquid lubricants - ISO viscosity classification ISO 6605 Hydraulic fluid power - Hose assemblies - Method of test 3. TEST PROCEDURES The test procedures described in the current issue of ASTM D380 shall be followed. However, in cases of conflict between th
13、e ASTM specifications and those described as follows, the latter shall take precedence. Unless otherwise specified in this document, or other SAE standards, tests shall be conducted at the prevailing ambient temperature of the testing facility. 4. STANDARD TESTS WARNING: Water or another liquid suit
14、able for the hose under test shall be used as the test medium. The use of air and other gaseous materials as testing media should be avoided because of the risk to operators. In special cases where such media are required for the tests, strict safety measures are imperative. Furthermore, it is stres
15、sed that when a liquid is used as the test medium, it is essential that all air is expelled from the test piece because of the risk of injury to the operator due to the sudden expansion of trapped air released when the hose bursts. 4.1 Dimensional Check Test The hose shall be inspected for conformit
16、y to all dimensions tabulated in the applicable specification. Determine finished outside diameters and reinforcement diameters, where required, by calculation from measurement of the respective circumference. As an alternative, use a flexible tape graduated to read the diameter directly. Measure th
17、e inside diameter by means of a suitable expanding ball or telescoping gage. Measure concentricity over both the reinforcement and the finished outside diameters using either a dial indicator gage or a micrometer. SAE INTERNATIONAL J343 DEC2017 Page 3 of 10 Round the foot of the measuring instrument
18、 to conform to the inside diameter of the hose. Take readings at 90 intervals around the hose. NOTE: Acceptability is based on the total variation between the high and the low readings. Take inside and outside diameter measurements at a minimum of 25 mm from the hose ends and concentricity measureme
19、nts at a minimum of 13 mm from the hose ends. 4.2 Proof Test Test the hose assemblies hydrostatically to the specified proof pressure for a period of not less than 30 seconds nor more than 60 seconds. There shall be no indication of failure or leakage. 4.3 Change in Length Test Conduct measurements
20、for the determination of elongation or contraction on a previously untested, unaged hose assembly having at least 600 mm length of free hose between hose fittings. Attach the hose assembly to the pressure source in an unrestricted straight position. If the hose is not straight due to its natural cur
21、vature, it may be fastened laterally to achieve a straight position. Pressurize to the specified operating pressure for a period of 30 seconds, then release the pressure. Place accurate reference marks 500 mm apart on the outer cover of the hose, midway between fittings, after allowing the hose asse
22、mbly to restabilize for a period of 30 seconds following pressure release. Repressurize the hose assembly to the specified operating pressure for a period of 30 seconds. Measure the final length while the hose is pressurized. The final length is the distance between reference marks while the hose is
23、 pressurized. Complete the determination of the change in length using Equation 1: 100l0 01 (Eq. 1) where: 0 = distance between the reference marks when the hose was not pressurized following the initial pressurization 1 = distance between the reference marks under pressure = percentage change in le
24、ngth, which will be positive (+) in the case of an increase in length and negative (-) in the case of a decrease in length SAE INTERNATIONAL J343 DEC2017 Page 4 of 10 4.4 Burst Test Subject unaged hose or hose assemblies, on which the end fittings have been attached for not more than 30 days, to a h
25、ydrostatic pressure. Increase the pressure at a rate in accordance with the following paragraph until the hose or hose assembly fails. The rate of pressure increase shall be constant and chosen to reach hose or hose assembly failure after a period of between 30 and 60 seconds for hoses with nominal
26、inside diameters up to 51 mm. For hoses with nominal inside diameters greater than 51 mm and less than or equal to 250 mm, the time needed to reach hose or hose assembly failure shall be between 60 and 240 seconds. Reject hose or hose assemblies showing leakage, hose burst or indication of failure b
27、elow the specified minimum burst pressure. The location, pressure and mode of failure shall be recorded in the test report. NOTE: This is a destructive test. Assemblies which have been subjected to this test shall be destroyed. 4.5 Cold Bend Test Subject hose assemblies to the specified temperature
28、in a straight position for 24 hours. Then, while still at the specified temperature, the samples shall be evenly and uniformly bent once over a mandrel having a diameter equal to twice the specified minimum bend radius. Bending shall be accomplished within a period of not less than 8 seconds nor mor
29、e than 12 seconds. In the case of hose sizes up to and including 22 mm nominal inside diameter, bend them through 180 over the mandrel; in the case of hose sizes larger than 22 mm nominal inside diameter, bend them through 90 over the mandrel. After bending, allow the sample to warm to room temperat
30、ure, visually examine it for cover cracks and subject it to the proof test. There shall be no cover cracks or leakage. (In lieu of the bending test, hoses larger than 22 mm nominal inside diameter may be considered acceptable if samples of tube and cover pass the Low Temperature Test on Tube and Cov
31、er of ASTM D380.) Reject any samples with visible cracks or leakage. NOTE: This is a destructive test. Assemblies which have been subjected to this test shall be destroyed. 4.6 Impulse Test The impulse test has two categories: 1. High pressure, which covers pressures higher than 3 MPa 2. Low pressur
32、e, which covers 1.5 to 3 MPa Test four unaged hose assemblies with end fittings, which have been attached for not more than 30 days. Where the individual standard requires, also test aged hose assemblies. SAE INTERNATIONAL J343 DEC2017 Page 5 of 10 Calculate the free (exposed) length of hose under t
33、est, shown on Figure 1, as follows: a. Hose sizes up to and including 22 mm nominal inside diameter (see Equation 2): d22/drle n g t h fr e e b e n d 1 8 0 (Eq. 2) b. Hose sizes larger than 22 mm nominal inside diameter (see Equation 3): d22/dr2/le n g t h fr e e b e n d 90 (Eq. 3) where: r = minimu
34、m bend radius d = hose outside diameter NOTE: Use d = 25.4 mm for the 2d term until d is equal to or greater than 25.4 mm. Figure 1 - Test specimen for pressure impulse test Connect the test pieces to the apparatus. The test pieces shall be installed according to Figure 1. Test pieces of hose of nom
35、inal inside diameter up to and including 22 mm shall be bent through 180 and hoses of nominal inside diameter larger than 22 mm shall be bent through 90. Select a test fluid from ISO VG 32 to VG 100 at 40 C per ISO 3448, and circulate it at a rate sufficient to maintain a uniform fluid temperature w
36、ithin the hose assemblies. Other fluids may be used as agreed upon between the customer and the manufacturer. SAE INTERNATIONAL J343 DEC2017 Page 6 of 10 Test the hose at the impulse test pressure indicated in the individual specification. The test fluid shall be circulated through the assemblies at
37、 the specified temperature with a tolerance of 3 C. Cooling or heating of the test chamber shall not be permitted, except when individual standards require testing with synthetic base test fluids at a temperature higher than 150 C. When such higher temperatures are required, the impulse test fluid n
38、eed not be circulated if both the fluid and the assemblies are externally heated in the test chamber, at the specified temperature with a tolerance of 5 C. Apply a pulsating pressure internally to the hose assemblies at a rate described in the category chosen and record the frequency used. The press
39、ure cycle shall fall within the shaded area of either Figures 2 or 3, depending upon the test category and conform as closely as possible to the curve shown. The actual rate of pressure rise shall be determined as shown on Figure 2, and shall be within a tolerance of 10% of the calculated nominal va
40、lue. Key a Secant pressure rise rate. b Rate of pressure rise to be determined between these two points. c 45% to 55% of a complete impulse cycle. d One complete impulse cycle. Figure 2 - Pressure impulse wave form envelope for high pressure impulse test category 1 NOTE 1: Secant pressure rise is th
41、e straight line drawn through two points on the pressure rise curve; one point at 15% of the test pressure and the other at 85% of the test pressure NOTE 2: Point 0 is the intersection of the secant pressure rise with a pressure of 0 MPa (0 bar). NOTE 3: Pressure rise rate is the slope of the secant
42、 pressure rise expressed in megapascals per second (MPa/s). NOTE 4: Cycle rate shall be uniform at 0.5 to 1.3 Hz. NOTE 5: The nominal rate of pressure rise shall be equal to that shown in Equation 4: SAE INTERNATIONAL J343 DEC2017 Page 7 of 10 kp10fR (Eq. 4) where: R = rate of pressure rise in megap
43、ascals per second (MPa/s). F = frequency in hertz (Hz). P = nominal impulse test pressure in megapascals (MPa). K = is equivalent to 5 megapascals (MPa). Key a Secant pressure rise rate. b Rate of pressure rise to be determined between these two points. c 45% to 55% of a complete impulse cycle. d On
44、e complete impulse cycle. Figure 3 - Pressure impulse wave form envelope for low pressure impulse test category 2 NOTE 1: Secant pressure rise is the straight line drawn through two points on the pressure rise curve; one point at 35% of the test pressure and the other at 85% of the test pressure NOT
45、E 2: Point 0 is the intersection of the secant pressure rise with a pressure of 0 MPa (0 bar). NOTE 3: Pressure rise rate is the slope of the secant pressure rise expressed in megapascals per second (MPa/s). NOTE 4: Cycle rate shall be uniform at 0.2 to 1.0 Hz. NOTE 5: The nominal rate of pressure r
46、ise shall be equal to that shown in Equation 4. SAE INTERNATIONAL J343 DEC2017 Page 8 of 10 Determine the duration of the impulse test in total number of cycles by the individual standard for the hose assemblies. Where aged samples are required, refer to the individual standards. It is recommended t
47、he test fluid be changed frequently to prevent breakdown. NOTE: This is a destructive test. Assemblies, which have been subjected to this test, shall be destroyed. 4.7 Leakage Test Subject unaged hose assemblies, on which the end fittings have been attached for not more than 30 days, to a hydrostati
48、c pressure of 70% of the specified minimum burst pressure for a period of between 5.0 to 5.5 minutes. Reduce the fluid pressure to 0 MPa. Re-apply the 70% of minimum burst hydrostatic pressure for another 5.0 to 5.5 minute period. Reject assemblies showing leakage or failure. NOTE: This is a destruc
49、tive test. Assemblies which have been subjected to this test shall be destroyed. 4.8 Visual Examination of Product All bulk hose shall be visually inspected to see that the hose identification has been properly applied and all assemblies shall be inspected to determine that the correct fittings are properly installed. 4.9 Oil Resistance Test After 70-hour immersion in ASTM Emergen
