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Scope

Revised Draft JTP for Hydraulic & Pneumatic Actuators HCAT Meeting at Toronto, Canada National Technical Systems / Elwin Jang / 916-392-6163 August 28-30, 2001. Scope. Significant Information Teleconference on 7 Aug to discuss JTP Coatings & Substrates

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Scope

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  1. Revised Draft JTP for Hydraulic & Pneumatic ActuatorsHCAT Meeting at Toronto, CanadaNational Technical Systems / Elwin Jang / 916-392-6163August 28-30, 2001

  2. Scope • Significant Information • Teleconference on 7 Aug to discuss JTP • Coatings & Substrates • Fatigue Testing – Converted into Draft Performance Work Statement (PWS) • Functional Hydraulic Testing – Appendix B, Draft PWS • Corrosion Testing

  3. Teleconference on 7 Aug • Recommended Changes Included • Consider Changing “Grit Blast with 54-grit Al Oxide at 60 PSI” to “54-60 Mesh Al Oxide at 40-60 PSI for Steel; Clean Ti with Acetone, Do Not Blast to Avoid Imbedding Grit & Create Stress Risers” • Need to Clarify “Deposit to Almen Number of 6-20N”; This is a Very Broad Range • Delete Specifying Quantities of Gases and HVOF Application Instructions; Replace with “Apply HVOF Coatings to Comply with QC Coating Performance Requirements.”

  4. Coatings & Substrates • Selected HVOF Coatings - WC/Co-Cr, WC/Co, Tribaloy T-400, Cr3C2/NiCr • Also Will Test Electroless Ni on Several Piston Heads in Functional Hydraulic Testing • Selected Substrates: 4340 steel, PH15-5 SS, PH13-8 SS, HP9-4-30 steel, & Ti10-2-3 Ti • Replaced PH14-7 with PH13-8 per NAVAIR & GE/Jerry Schell recommendations

  5. Fatigue Testing • Converted Fatigue Section in JTP into PWS • HVOF Coatings will be Ground to 2-5 Ra, Except for Tribaloy T-400 to 10-14 Ra • Only Test R = -1; Delete testing R = 0.1 • R = -1 is a more stringent test • Since we know the shape of S/N curves, full curve (4 stress levels) for uncoated specimens; only highest & lowest stresses for coated specimens (~110 & 80 ksi); Total 740

  6. Functional Hydraulic Testing • Shamban Provided Flight Control & Utility Actuator Duty Cycles & Test Procedures • Greene Tweed Coordinated Above • Included a Piston Head in Middle of Rod Specimen • One Section of Rod Specimen Ground Finish & Another Section Superfinish for Comparison

  7. Superfinishing • The chrome baseline test rods will be superfinished to the following surface control specifications: • Ra = 4 to 8 in • Rtm = 40 in. max • Rp = 24 in. max. • Rsk = -0.5 to –1.5 • Tp = 50 to 70% @ depth p= 0.25 Rtm

  8. Superfinishing (cont.) • The HVOF coated test rods will be superfinished to the following surface control specifications: Ra = 2 to 5 in (10 to 14 in control specification for Tribaloy T-400) Rpk = <1.8 in. Tp = </= 85% at 4in. >/= 60% at 8in.

  9. Functional Hydraulic Testing (cont.) • Mil-PRF-83282 Hydraulic Fluid • Mil-P-83461 Nitrile Elastomeric Seals for Withstanding 275oF • Expose Seals from –65oF to 275oF • Test Conditions • Flight Control Actuator – 6M Cycles; Dithering • Utility Actuator – 450K Cycles; Longer Strokes • Side Load –72 lbs

  10. Corrosion Testing • Neutral Salt Fog or Sulfur Dioxide Tests • Rod Specimens • HVOF Coatings – 2-5 Ra Finish • 2 Specimens per Test • Total Number Specimens – 98

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