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General Instructions for Sample Submission
Instrumentation
Equipment and Facilities
Initialization Procedure Sample Preparation
Test Operation
Standard Operating Procedure -One Stage
Prentation of Dataqueues
9) Header Information
10) Post-Test Sample Review
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11) Sample Disposal
12) References
Appendix
1. Purpo
The purpo of this test is to produce torque-angle data (angular rotation) which can be ud to determine an appropriate asmbly torque specification for a threaded joint as well as the joint failure mode. The test is run with a slightly oversized power tool in order to drive the fastener to failure. A Torque-Angle plot is generated to show joint behavior during asmbly. Typical data generated include Threshold(b1_Yield 1), YIELD (b2_Yield)and ULTIMATE (a1_Ult) torque data to determine the limits for tting the asmbly torque specification.
A Drive to Strip test is performed for lf tapping screws to determine the +4σ drive torque and the -4σ strip torque as the limits for fitting an asmbly torque specification 2.
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2. General Instructions for Sample Submission
Plea refer to the Fastener Engineering Lab Process Guide for complete instructions on generating a Testnet Request, sample requirements and submission process.
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Sample Preparation
Sample parts should be in production-level condition (i.e. unud and with appropriate surface finish such as e-coat, paint, etc…).In addition, large components should be ctioned to a size and weight which can easily handled by the test technologist. Caution should be exercid to make sure that the joint is not structurally altered from the application state.
Sample size
Minimum of 15 test samples + 3 additional samples for test t-up.
3. Instrumentation
Suitably-sized calibrated Torque Transducer
MC900 Transient Recording Analyzer.
4. Equipment And Facilities
Select the smallest power tool with the capability of tightening the joint to failure at the rundown. U an appropriate fixture for curing the asmbly firmly so parts do not rotate during testing.
5. Initialization Procedure
Before beginning sample testing for each test request, a test initialization procedure shall be run according to the FST- 01 Joint Test Equipment Initialization Procedure.
6. Test Operation
Parts are asmbled according to design intent. During the test, the fastener is torqued to failure as the analyzer records data for RPM, Torque and Angle. Bad on the obrved failure mode, the Torque-Angle plot is identified as an Yield-Ultimate or Drive-Strip.
7. In support of VOPFAN-244, the Standard Operating Procedure for all joint types shall be a One-Stage RPM cure to failure.
YIELD-ULTIMATE TRACE EXAMPLE:
b1_Yield
c1_Drive
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One-Stage Rundown Speed Chart:
DRIVE-STRIP TRACE EXAMPLE:
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Channels
8. Prentation Of Data
Statistical information shall be prented in the table as:
, Maximum and Minimum Photos shall be included in the report of
Parts after test, highlighting failure mode
Any obrved features of interest
be provided
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