Where Can I Find the Structural Damping Coefficient for Tungsten?

[ricky_fusion]

Homework Statement

Known :
- Material : Tungsten
- Property : G7 - Drill, you can see the picture in here :
http://www.accuromm.com/drills.html"
- Other information you can find here :
1. http://www.efunda.com/materials/com...m?MatlPhase=Solid&MatlProp=Acoustic#Acoustic"
2. http://www.efunda.com/materials/com...atlPhase=Solid&MatlProp=Mechanical#Mechanical
3. http://en.wikipedia.org/wiki/Tungsten"

For information : I am newbie about dynamic analysis and before this, I am analysis about static only. Can anyone help me solve this problem?? I am appreciated your helpfull and Iam so sorry to makes you busy.If anyone can tell me about the step by step, it's okay to me.
The question are :
1. I want to looking for Vibration and critical point
2. do you know where I can find Structural Damping Coefficient for Tungsten??
3. How to created fungtion of Power Spectral Density
4. How to created fungtion of Frequency Responce

Homework Equations

http://en.wikipedia.org/wiki/Vibration"

The Attempt at a Solution

I have been try this steps, but I am confucing about the next steps.
1. For Yield Stress =550 MPa, Ultimate Strength = 550-620 MPa (as known in wikipedia)
2. Allowable/Permissible Stress= 0.4 (Yield Stress) = 220 MPa
3. Safety Factor = (ultimate Stress)/(Allowable Stress) = 3

 

[Valkarie]

.184. Natural Frequency = (1/2π) √(K/M) 5. Critical Speed = (1/2π) √(K/M) * (1/Safety Factor) 6. Vibration Amplitude = Acceleration/Gravity7. Structural Damping Coefficient ?????8. Function of Power Spectral Density ?????9. Function of Frequency Responce ?????

 

[Mene]

.5
4. Use this formula to find the critical point : F critical = (pi^2*E*I)/L^2
5. Use the information from the websites provided to find the Young's Modulus (E) and Moment of Inertia (I) for Tungsten.
6. Use the length (L) and critical force (F critical) to find the critical point.
7. To find the vibration, you can use the formula for natural frequency: f = (1/2pi)*sqrt(k/m), where k is the stiffness and m is the mass.
8. Use the information from the websites to find the density of Tungsten and calculate the mass.
9. Use the information from the websites to find the stiffness of Tungsten and plug it into the formula for natural frequency.
10. To find the Structural Damping Coefficient, you can use experimental data or consult a materials handbook that provides this information. Alternatively, you can use the formula for critical damping: c = 2*sqrt(k*m), where k is the stiffness and m is the mass.
11. To create a function for Power Spectral Density, you can use the formula: S = (2*pi*f)^2*F^2, where f is the frequency and F is the amplitude.
12. To create a function for Frequency Response, you can use the formula: H = (1/sqrt((1-(f/fn)^2)^2 + (2*Zeta*f/fn)^2), where fn is the natural frequency, f is the frequency, and Zeta is the damping ratio.