1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15868 Torque to Slip Evaluation of Fastened Joints Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 1 of 9 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict betw
2、een the English and domestic language, the English language shall take precedence. 1.1 Purpose. To determine the torque required to slip mating rotational components of a fastened joint. Examples of joints where this procedure may be used would include: crankshaft balancer (damper) to crankshaft, ac
3、cessory drive belt tensioner attachments, and flywheels/flex plates. 1.2 Foreword. Not applicable. 1.3 Applicability. Unless otherwise specified, this procedure applies to the initial tightening event of joints using threaded fasteners with new thread and bearing surfaces and new clamped members. 1.
4、3.1 Limitations. This procedure does not apply to Pulse tools. 1.3.2 Unless otherwise specified, any requirements or direction provided in the test request documentation will supercede this test procedure. 2 References Note: Only the latest approved standards are applicable unless otherwise specifie
5、d. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. GM approved laboratory or location for this test procedure. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3
6、.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. 3.2.1 Torque angle transducer. 3.2.2 Data acquisition system capable o
7、f collecting data at a sampling rate of at least 1000 Hz, plotting data at user specified scales, and identifying data at all points on the curve. 3.2.3 Tightening tool. 3.2.4 Appropriate fixtures, bedplate, or slotted table. 3.2.5 Strain indicator. 3.2.6 Strain-gaged fastener, force washer, or fast
8、ener prepared for ultrasonic measurement. 3.3 Test Vehicle/Test Piece. 3.3.1 A complete bill of materials of required test pieces will be specified in the test request documentation. 3.3.2 Unless otherwise specified, a minimum of 8 samples are to be used for this procedure. If fewer samples are test
9、ed due to material availability, it will be noted in the report. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 Gen
10、eral Motors Company All Rights Reserved July 2013 Page 2 of 9 3.4 Test Time. Calendar time: 6 to 8 days Test hours: 24 hours Coordination hours: 24 hours 3.5 Test Required Information. Test request documentation shall outline specific information and test parameters (reference Appendix A or use simi
11、lar format). 3.6 Personnel/Skills. Test Technician shall be qualified on the basis of appropriate education, training, experience, and/or demonstrated skills. 4 Procedure 4.1 Preparation. 4.1.1 Unless otherwise specified in the test request, samples are to be tested in the as-received condition. Thi
12、s excludes any condition specifically caused by material storage or configuration (e.g., if debris falls into a threaded hole from laboratory rework, it is acceptable to blow debris out of holes). 4.1.2 Any modifications to parts, not specifically requested in the test request that may affect test r
13、esults, are to be documented in the test notes. All test configurations, parts and noted deviations to be approved prior to executing test. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed
14、upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Review part quantities and condition. 4.3.2 Secure test part to T slot table or fixture. 4.3.3 Select proper tool, torque-angle transducer, and prepared fastener for clamp load
15、measurement. 4.3.4 If applicable, configure Ultrasonic measurement device to capture tension values. Note: Ultrasonic measurement and strain gaged fasteners are not suitable for the determination of tension in the plastic area. 4.3.5 Configure tooling to reproduce requested tightening strategy of th
16、e fastener. 4.3.6 Align tool and torque transducer to prevent side loading. 4.3.7 Unless otherwise specified, test requestor is to approve test setup. 4.3.8 Take photograph or digital image of test configuration. 4.3.9 Unless otherwise specified, tighten the first sample according to the tightening
17、specification, recording peak installation torque, tension, and angle. 4.3.10 Apply slip torque (reference Figure 1 or use similar setup) to desired member while recording torque and angle. Continue applying torque until components slip relative to one another. Copyright General Motors Company Provi
18、ded by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 3 of 9 Figure 1: Test Setup with Fixture to Slip
19、 Rotational Joint 4.3.11 Review with requestor and receive approval prior to proceeding. 4.3.12 Repeat 4.3.9 and 4.3.10 for the remaining test pieces. 4.3.13 Summarize all results according to the requirements of Section 5. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. Not
20、applicable. 5.3 Test Documentation. 5.3.1 Summary of Results - Required. 5.3.1.1 Provide detail of failure modes consisting of, but not limited to, fastener fracture, component fracture, component distortion or internal or external thread stripping (if applicable). 5.3.1.2 Test incidents to be recor
21、ded on Test Data Summary Sheet (reference Appendix B or use similar format). 5.3.1.3 Test data summarization to be on Test Data Log Sheet (reference Appendix C or use similar format). 5.3.1.4 Required plots and tabular data tables include items shown in Table 1. Tightening Tool Slip Fixture Tightene
22、d Joint Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 4
23、of 9 Table 1: Test Data Where: I = Individual sample plots M = Multiple sample plot D = Dual Y axis plots S = Statistical plot T = Tabular data table, followed by the incremental value. X-Axis Y-Axis Torque TensionAngleCompressionLoadDisplacement RPMTime Torque T5Slip Torque I Tension M M Angle Comp
24、ression Load Displacement RPM 5.3.2 Summary of Results - Optional. After reviewing required data summarization, requestor may ask for additional items including, but not limited to, the following: 5.3.2.1 Optional plots and tabular data tables. Include items shown in Table 2. 5.3.2.2 Magnified Scale
25、 Plots. Additional plots rescaled to magnify desired detail of curves. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 20
26、13 General Motors Company All Rights Reserved July 2013 Page 5 of 9 Table 2: Optional Test Data Where: I = Individual sample plots M = Multiple sample plot D = Dual Y axis plots S = Statistical plot T = Tabular data table followed by the incremental value X-Axis Y-Axis Torque TensionAngleCompression
27、LoadDisplacement RPMTime Torque T10 DMT10 Slip Torque DMT10 Tension Angle Compression Load Displacement RPM DIM6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the respo
28、nsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Clamp Load: Force normal to the mating surfaces of the joint provided by the fastener. Failure Modes: May consist
29、of, but are not limited to, fastener fracture, component fracture, component distortion or internal or external thread stripping. Fracture is defined as the partial or complete separation of one or more of the joint components. Maximum Torque: The maximum torque value observed during testing of the
30、joint. Prevailing Torque: The maximum torque value observed while rotating the fastener prior to contacting the clamped member of the joint. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license
31、 from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 6 of 9 Slip Torque: Torque value measured at the moment components slip relative to one another. Test Request Documentation: Forms outlining specific requirements, proce
32、dures, and desired results of laboratory test to be performed. 7.2 Acronyms, Abbreviations, and Symbols. CCW Counterclockwise CW Clockwise Hz Hertz Nm Newton Meter 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW15868 9 Release and Revisio
33、ns This standard was originated in April 2008. It was first approved by Global Fastening & Sealing Test Lab Leadership Team in June 2008. It was first published in June 2008. Issue Publication Date Description (Organization) 1 JUN 2008 Initial publication. 2 JUL 2013 Five year refresh of standard. R
34、evised to allow use of tables similar to Appendices A thru C and setup similar to that shown in Figure 1. (Fastening & Sealing Test Lab Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or network
35、ing permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 7 of 9 Appendix A Data Sheet A1: Test Required Information Worksheet Test Title: _ Model Year/Program: _ Test Request No: _ Requestor/Phone:
36、 _ Part Number Quantity Description Fastener Diameter Fastener Grade Or Class Fastener Pitch 1. Part Disposition at Completion: _ 2. Required Completion Date: _ 3. Master Process Document or Diagram Attached? Y N, If Yes, Document Identification Number _ 4. Tightening Sequence Required Y N (If Yes,
37、attach diagram) 5. Number and Orientation of Tool Spindles _ (attach diagram if necessary) 6. Tool Type: _ 7. Tool Free Spinning Speed: _ RPM Maximum Torque: _ Nm 8. Tool Downshift Y N (If Yes, Downshift Parameter _ Downshift Free Speed _) 9. Tool Rotation: Clockwise (CW) Counterclockwise (CCW) 10.
38、Tool Trigger: Torque: _ Nm Angle _ Degrees 11. Requested Tightening Specification If applicable: _ Nm. To Fail? Y N 12. Current Tightening Specification If applicable: _ Nm. To Target? _ Nm 13. Test Piece Orientation (attach diagram if necessary) 14. Test Coupon Used? Y N If Yes, drawing or sketch r
39、equired. Test Matrix Step Number Description Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15868 Copyright 2013 General Motors Company
40、All Rights Reserved July 2013 Page 8 of 9 Appendix B Data Sheet B1: Test Data Summary Sheet Fastener Test Start Date: Test Engineer: Page of End Date: Technician: Test Request No: Location: File Name: Location: File Type: Mc900 Boltmike Megadac Test Title: Others: Test Description: Torqued Member: C
41、lamped Member: Bearing Surface: Stationary Member: Sample Number: Date: Operator: Comments: Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS
42、GMW15868 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 9 of 9 Appendix C Data Sheet C1: Test Data Log Sheet Fastener Test File Log and Summary Page _ of _ Test Title: Test Request Number Date Test Location Requestor Technician Sample Hz Filter Hz Comments Date File Name Comments Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
