Page Comparison

...

• Mechanical Tests

  • Tensile Test- needed for plug

    • How to test it

    • Probably not needed since the push rod will be under constant compression

  • Flexural Test

    • three-point and four-point bend testing according to ISO 14,125, ISO 178, ASTM D 790, and ASTM D 6272

    • parameters for this test are the support span, the speed of the loading, and the maximum deflection for the test

  • Impact Test

  • Compression Test

    • End loading

    • Sheer loading

    • ASTM D 695, ASTM D 3410, and ISO 14,126.

    • information on elastic limit, proportional limit, yield point, yield strength, and compressive strength

• Strength at high temperatures (Summer)

• Fatigue Failure?

...

Insert Testing

• Adhesive

  • EA E-40HT

    • strength tapers off pretty fast around 40 degree celsius

  • DP420

    • Etched Aluminum Strength Test: 4500 psi

    • Couldn’t find temp to % strength chart

  • DP460

    • FPL Etched Aluminium Shear Strength: 31 N/mm² OR 4500 psi

    • Couldn’t find temp to % strength chart

  • Loctite - Hysol E‐120HP

    • room temp cure

    • Tensile strength of 41 N/mm^2

    • Aluminum abrasion and acid etched lap shear strength 33 N/mm^2 (4800 psi)

    • 100% strength even at 40 degrees Celsius

• Tube and metal prep

  • Aluminum etching and Alodine coating to prevent corrosion and increase bond strength

    • West  System 860 Aluminum Etching Kit

    • DuPont Acid Etch and  Alodine solutions

  • Submerge Aluminum in etch solution, then submerge in non-diluted Alodine solution

• Aluminum stock for insert

  • Check for appropriate lengths

    • Bond length increases linearly with bond strength

  • Gap 0.004 - 0.012 in for hot bonding

  • Gap 0.008 in for cold bonding

  • Carved aluminum, tapped for fitting a bearing insert

  • create shoulder only for grabbing in tensile test

  • In MIT paper, flashbreaker tape was used to add thickness at the end of the insert to create equal spacing and center insert.

• Helicoil

  • Could avoid use if we use steel stock for the inserts

  • If we use a 1/4” - 28 End Rod

    • the bore hole will have to be #3 drill bit (0.213 inches)

    • tapped using 1/4" - 28 STI tap

    • Insert a 1/4" - 28 bolt Helicoil

Adhesive strength

$$\tau \cdot A= F_{max}$$

...