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Dynamic Mechanical Properties of Metals

Dynamic Mechanical Properties of Metals. Madison Minsk, Ananya Garg , Rachel Ngai, Ian Culhane , Eric Spear. Introduction. Internal Friction : the force that resists the motion of the elements in a solid while it undergoes deformation. Introduction.

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Dynamic Mechanical Properties of Metals

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  1. Dynamic Mechanical Properties of Metals Madison Minsk, AnanyaGarg, Rachel Ngai, Ian Culhane, Eric Spear

  2. Introduction • Internal Friction: the force that resists the motion of the elements in a solid while it undergoes deformation

  3. Introduction • Shear Modulus: the ratio of shear stress to the shear strain; describes the material's response to shear stress • Higher shear modulus results in less deformation from force

  4. Introduction • Torsion Pendulum: torsion wire is free to twist about its axis, causing the disk to rotate, associated with mechanical deformation

  5. Setup

  6. Experiment • Twist wire to initiate torsional oscillation • Measure frequency of oscillation • Measure amount of damping of oscillation

  7. Calculations Internal Friction 1/20 [ln(T0/T20)] T0 T20

  8. Calculations • Shear Modulus =r f = frequency in Hz p = Period in seconds G = Shear Modulus I = Moment of Inertia =L

  9. Crystal Structure • Steel is Body Centered Cubic (BCC) • Carbon atoms occupy interstitial sites

  10. Dynamic Mechanical Analysis (DMA) • Oscillating stress is applied, strain is measured • Frequency of oscillation or temp is altered • Output: Frequency (hz) vs Probe position (mm) graph

  11. Comparison of Shear Modulus and Internal Friction in Five Metals Dimensions 0.064” 30.0625”

  12. Conclusion/Application • The shear modulus- important when materials will be subjected to shear stress • The internal friction- important in applications like airplane engines (subjected to vibrations)

  13. Special Thanks • Roy Baggerly • David Starkebaum • Davis Tran • Boeing • Tuesday Kuykendall

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