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Meso-Scale High Cycle Fatigue Tests of Irradiation Ti-6Al-4V

Meso-Scale High Cycle Fatigue Tests of Irradiation Ti-6Al-4V. Jicheng Gong & Angus J Wilkinson. Micromechanics Group, Oxford University. 14 th Nov 2016. New mushroom meso-fatigue design. Low stress concentration High inertia to increase stress

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Meso-Scale High Cycle Fatigue Tests of Irradiation Ti-6Al-4V

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  1. Meso-Scale High Cycle Fatigue Tests of Irradiation Ti-6Al-4V Jicheng Gong & Angus J Wilkinson Micromechanics Group, Oxford University 14th Nov 2016

  2. New mushroom meso-fatigue design • Low stress concentration • High inertia to increase stress • Lower resonant frequency to compensate the influence of increased thickness • Compact to layout more specimens against the limited size of a foil • Work with new holders

  3. Tresca stress Tensile stress along axis

  4. Design one Design two Ф 3.4 mm R 0.8 mm R 0.9 mm Design four Design three R 1.0 mm R 1.1 mm

  5. Resonant frequency (Hz) of two thickness Elastic modulus = 114 GPa; Density = 4450 Kg/m3; Poisson’s ratio= 0.34

  6. Layout four types specimens in the primary foil Line 1 Design one Line 2 Line 3 Line 4 Design two Line 5 Line 6 Line 7 Design three Line 8 Line 9 Line 10 Design four Line 11

  7. Micro-laser machining of trial foil: four types, 115 specimens

  8. Step increase fatigue tests @ 106 cycles Failure vibration amplitude

  9. Based on vibration experiments, final dimension is determined Ф 3.4 mm R 9.5 mm Resonant frequency: 28477 Hz Note the width of the cantilever was also modified to compensate the width of laser beam

  10. Foil one: thickness measurements 247 228 239 242 230 260 249 252 250 250 256 255 257 252 255 257 256 256 252 258 249 246 258 260 252

  11. Foil two: thickness measurements 257 253 262 252 262 257 257 255 255 256 253 260 259 261 257 253 258 259 257 257 243 256 260 258 260

  12. New layout for irridiation foils with final design Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 Line 10 Line 11

  13. Status (C Densham) • 2 test foils lapped to correct thickness • Laser cutting proven, experimental foil cutting imminent • Vibration test procedure verified • Culham Materials Research Facility being commisioned – will be 1st active samples received

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