1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT Approved for Public Release.
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Transcript of 1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT Approved for Public Release.
1
FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER
OVERSIGHT
Approved for Public Release
Fastener Testing 2
Topics
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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Fastener Testing 3
Past Problems
– Lack of hydrogen embrittlement relief
– Wrong wedge angles
– Wrong gage lengths
– Sampling
– Process control of piercing diameter
– Concentricity of head and/or socket to shank
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Fastener Testing 4
Piercing Diameter
Minor Diameter Out of Tolerance
Minor Diameter Within Tolerance
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Fastener Testing 5
Concentricity
Socket is not centered in the head of the screwHead and shank are
not concentric
Socket is not centered in the head of the screw
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Fastener Testing 6
Topics
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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Fastener Testing 7
Quality Control
Mil-I-45208 “Inspection System Requirement” Requires:
•Clear and concise procedures. (Para. 3.2.1)
•Use of calibrated equipment. (Para. 3.3)
•Providing and maintaining adequate records (i.e. Objective Quality Evidence (OQE)). (Para. 3.2.2)
Other quality standards may apply ,however the rules are basically the same (e.g. MIL-Q-9858, ISO 9001).
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Fastener Testing 8
Topics
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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Fastener Testing 9
Test Methods
ASTM F606 Standard Testing Methods Are Typically Invoked
Unless Otherwise Specified
• Tensile / Yield / Elongation (Mach. specimens)• Axial Tension (Full Size fasteners)• Proof load (Full Size fasteners) • Wedge tension (Full Size fasteners)• Hardness
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Fastener Testing 10
Test Methods
Flat surface
•Hardness testing performed on a convex cylindrical surface
•Correction factors of ASTM E18 need to be applied
Cylindrical surface
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Fastener Testing 11
Test Methods
Determination Of Proper Wedge Angle For Wedge Testing
• ASTM F606 (Unless otherwise specified)
• ASTM A574 (Socket Head Cap Screws)
• MIL-S-1222H3 (Titanium, SC 10-122)
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Fastener Testing 12
Test Methods
Gage Lengths Are Different For Ferrous And Non-ferrous Fasteners
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Fastener Testing 13
Test Methods
Plated Steel Fasteners May Require Additional Processing And Testing
• The plating process can cause Hydrogen Embrittlement of steel fasteners.
• Post plate baking is normally required to drive off hydrogen introduced into the base material
• Hydrogen Embrittlement can cause delayed cracking.
• Stress Durability Testing may be required to determine the effectiveness of the post plate baking process.
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Fastener Testing 14
Test Methods
Determining Sample Size And Test Requirements
• The manufactured lot size is needed to determine the correct number of samples.
• Type of specimens.– Machined specimens– Full size fasteners
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Fastener Testing 15
Test MethodsDetermining sample size and test requirements
FF-S-86
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Fastener Testing 16
Determining sample size and test requirements
FF-S-86
Test Methods
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Fastener Testing 17
Determining sample size and test requirements
Mil-S-1222
Test Methods
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Fastener Testing 18
Determining sample size and test requirements
Mil-S-1222
Test Methods
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Fastener Testing 19
Topics
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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Fastener Testing 20
Test Variables
Variables that can affect test results
• Fixturing, Alignment.
• Speed of applied load.
• Test Specimen preparation (Surface finish).
• Tool marks act as stress risers.
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Fastener Testing 21
Topics
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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Fastener Testing 22
Test Reports
• Name of Testing Organization• Date of the test• Purchase Order number and Item number• Manufactured lot size• Material Spec. Alloy, Type, Class, Grade, Condition• Type of specimen tested (machined vs. full size)• Traceability to hardware (Lot Code)• Acceptance criteria.• Statement of acceptance or rejection• Units should be the same as those contained in the
acceptance spec. (lbs vs. psi)• Signature of test organization representative and date.
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Fastener Testing 23
Test ReportsC of C
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Fastener Testing 24
Test ReportsChemicals
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Fastener Testing 25
Test ReportsMechanicals
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Fastener Testing 26
Test ReportsMechanicals
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Fastener Testing 27
Test ReportsMechanicals
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Fastener Testing 28
Test ReportsNDT
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Fastener Testing 29
Test ReportsNDT
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Fastener Testing 30
Summary
• Past Problems
• Quality Control
• Test Methods
• Test Variables
• Test Report Content
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