1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15684 Dynamic Fastener Component Slip Test Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 1 of 6 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the
2、English and domestic language, the English language shall take precedence. 1.1 Purpose. Procedure used to determine force required to slip one component of an assembled joint relative to another. 1.2 Foreword. Not applicable. 1.3 Applicability. Applies to bolted joints on all vehicles. 2 References
3、Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. Approved fastener laboratories; including but not limited to: Supplier or supplier laboratory GM vehicle o
4、r engine plants GM transmission plants GM component part plants Satellite GM facilities 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. Howeve
5、r, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. 3.2.1 Fixturing of suitable strength to rigidly secure one side of the joint under test and permit application of the expected slip load to the other with
6、minimal deflection. 3.2.2 Fixtures shall be designed such that the test load simulates as closely as possible the in-service loading conditions of the subject joints. 3.2.3 Load frame with sufficient capacity to generate the anticipated slip load. 3.2.4 Load cell of sufficient capacity to measure an
7、ticipated slip loads. 3.2.5 Linear displacement measuring device(s) with 0.01 mm (0.0004 in) or better resolution. 3.2.6 Amplifiers and signal conditioning equipment as necessary to monitor applied load, relative motion between joint members, and joint clamping force(s), if applicable. 3.2.7 Data re
8、cording device capable of making permanent records of all acquired data. 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 GMW15684 Copyright
9、2013 General Motors Company All Rights Reserved July 2013 Page 2 of 6 Note: All instrumentation is to be calibrated as required; record instrumentation details and calibration due dates on Instrumentation and Equipment Calibration Details data sheet (see example in Appendix A, Data Sheet A1) unless
10、the information is otherwise preserved in the testing laboratory records. 3.3 Test Vehicle/Test Piece. 3.3.1 The sample size is to be specified by the Test Engineer, unless specific requirements are set by the test requestor. 3.3.2 Test components are to be selected and assembled per the applicable
11、design layout drawing(s) and/or the appropriate Product Assembly Documents. Elements of the joint may also be simulated with fixturing or non-design representative parts, contingent upon approval of the test requestor. 3.3.3 Instrumented fasteners (if possible) for measurement of joint clamping. 3.4
12、 Test Time. Not applicable. 3.5 Test Required Information. Test request and/or critical data sheet(s) shall outline specific information and test parameters. 3.6 Personnel/Skills. 3.6.1 Test Technician Skill Level. Technician shall be trained and competent in conducting this test procedure. 4 Proced
13、ure 4.1 Preparation. 4.1.1 Rework the test parts as required to permit secure attachment to the fixturing. 4.1.2 In some cases, additional clearance may have to be machined into the parts to allow measurable displacement to occur between the components. 4.1.3 Alterations to the test parts must not a
14、ffect the characteristics (stiffness, surface finish, contact area, etc.) of the joint. 4.1.4 Assemble the test components using instrumented fasteners if possible. Verify that clearance is present for the parts to move relative to one another in the direction in which load(s) will be applied. 4.1.5
15、 Threaded fasteners (if instrumented) are to be tightened to the minimum tension specified by the test requestor. If not, they are to be tightened to the minimum torque specified by the test requestor unless otherwise directed. Fasteners shall receive an index marking to enable visual detection of l
16、oosening when joint slips. 4.1.6 Install the assembled test sample in the fixturing. 4.1.7 Connect all instrumentation and servo-hydraulic controls. Calibrate full scale values which are relevant to the expected test conditions. 4.1.8 The linear displacement transducer(s) must be attached in such a
17、way that movement is measured between the test components in as direct a manner as possible, minimizing the effect of fixture movement as indicating test component displacement. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of
18、 this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 The applied load, relative displacement, and joint clamp load (if applicable) are to be monitored and recorded during all testing. 4.3.2 Fa
19、steners ARE NOT TO BE RE-TIGHTENED during the course of testing each sample. 4.3.3 Loads used should be selected with the in-service load environment in mind. Insure service loads do not fully, partially, or in any way reverse. Potential test part failure modes which may occur at loads lower than th
20、ose required to slip the joint (e.g., bucking, bending, or tensile failure, depending upon component geometry and/or material) may also affect the test loads selected. Loading levels and durations shall be consistent from sample to sample. Copyright General Motors Company Provided by IHS under licen
21、se with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15684 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 3 of 6 4.3.4 Apply a sinusoidally varying load with a frequency of 1 H
22、z to the test system. The mean load shall be zero. The initial peak to peak amplitude for each sample shall be 10% of either the predicted slip load or the expected maximum service load, at the discretion of the Test Engineer. Dynamic loading at this level shall run for approximately 150 cycles or o
23、ther duration as specified by the Test Engineer. Alternate load profiles may be specified by the test requestor based on their knowledge of the joint design and service loads. 4.3.5 Analyze the relationships between the applied load displacement and/or clamp load signals to determine if the joint bo
24、lt tension has reached a steady state. 4.3.6 If the joint has not stabilized, repeat 4.3.4 and 4.3.5. Continue until the joint either stabilizes or slips. 4.3.7 If the joint reached steady state bolt tension without slipping at the current load level, repeat 4.3.4 through 4.3.6 with the load amplitu
25、de increased by an increment equal to 10% of either the predicted slip load or the expected maximum service load. This increment should be consistent with the initial load selected in 4.3.4. 4.3.8 Continue repeating 4.3.4 through 4.3.7 at incrementally greater load amplitudes until slip is observed.
26、 4.3.9 When the joint has slipped, suspend testing of the sample. Record residual clamping force and fastener torque prior to disassembly of the joint. Inspect test components during disassembly and document any observed deformation(s) and/or other damage with log entries and photographs. Retain tes
27、t samples for inspection by the Test Engineer and the test requestor. 4.3.10 Repeat 4.1.4 through 4.3.9 for the desired number of samples. 4.3.11 Document all test equipment and instrumentation used, including a photograph of the experimental apparatus. 5 Data 5.1 Calculations. Not applicable. 5.2 I
28、nterpretation of Results. Not applicable. 5.3 Test Documentation. For each sample, tabulate applied loads, bolt tensions, and number of cycles for each load interval and at joint slip (see example in Appendix B, Data Sheet B1). 6 Safety This standard may involve hazardous materials, operations, and
29、equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility 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 Glossar
30、y. Clamp Load: The force normal to the mating surfaces of the test parts generated by the fasteners(s). Fastener(s): The device(s) used to attach one part to another; e.g., nut and bolt or screw. Slip: A change in the relationships between the following variables: applied force, displacement, and/or
31、 clamp load. Slip Force: The force required to move or slip one clamped member relative to the other. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW15684 Copyright General Motors
32、Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15684 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 4 of 6 9 Release and Revisions This
33、 standard was originated in September 2007. It was first approved by the Fastening & Sealing Test Lab Global Subsystem Leadership Team representatives in January 2008. It was first published in January 2008. Issue Publication Date Description (Organization) 1 JAN 2008 Initial publication. 2 JUL 2013
34、 Five year refresh of standard. Removed references to hydraulic tensile test equipment, strip chart recorders (antiquated), and defined test time. (Fastening & Sealing Test Lab Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors Compan
35、yNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15684 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 5 of 6 Appendix A Data Sheet A1: Instrumentation and Equipment Calibration Details Instrumentation/
36、Equipment Description Manufacturer Model Number Serial Number Calibration Due Date 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 GMW15684
37、Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 6 of 6 Appendix B Data Sheet B1: Bolt Cyclic Loading Data 0.5 Hz Sinusoidal Load Interval Interval Maximum Peak Applied Load (kN) Interval Minimum Peak Applied Load (kN) Bolt Tension at Start of Interval (kN) Bolt Tension at End of Interval (kN) Number of Cycles Completed for Load Interval Number of Cycles Completed Cumulative Comments Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
