I'm trying to find any information on comparative machining rates for wire EDM versus conventional milling. This is for machining through-slots in ultrasonic horns - examples in http://krell-engineering.com/fea/industr/industrial_resonators.htm. The supporting web page is...
The image shows a plate with a 10mm wide slot. In this design the slot's end shape is a 20mm x 10mm ellipse. A uniform tensile load is applied to the plate's top surface (the narrow surface at the top of the image). Compared to a slot with an R5mm end shape, the von Mises stress is 23% lower...
In ultrasonic metal welding, a serrated tip engages the top workpiece and causes it to oscillate, typically at 20000 Hz. The tip amplitude may be in the range of 10 to 50 micrometers, peak-to-peak. Meanwhile, a serrated anvil engages the bottom workpiece to restrain it from vibrating. A...
For charge q, the first time derivative dq/dt is the current i. The 2nd time derivative is d^2q/dt^2. Is there a name for this?
By analogy, for a mechanical system the displacement is u and the first time derivative du/dt is the velocity. The 2nd time derivative d^2u/dt^2 is the acceleration...
Which is generally preferred - micro-meters or ISO N scale? (See http://www.engineersedge.com/manufacturing/surface-roughness-conversion.htm)
Thanks.
Don C.
If the bandwidth for an RLC series circuit is defined as f2 - f1, then what are the correct units for the frequencies?
- http://www.allaboutcircuits.com/textbook/alternating-current/chpt-6/q-and-bandwidth-resonant-circuit/ (about half way down) uses Hz.
-...
I'm looking for the 9 orthotropic properties (3 Young's moduli, 3 shear moduli, 3 Poisson's ratios) for Ti-6Al-4V. These should be for plate or rectangular bar material but not sheet material. I know that the values can be affected by many conditions. However, I just want to see the general...
I have a cylindrical cantilevered titanium rod whose cross section varies along its length. The rod vibrates axially at high frequency and so may fatigue. The free end of the rod has a static axial tensile force and also a static transverse force. These static forces may affect the fatigue life...
I have a specimen of Ti-6Al-4V plate (approx. 3" x 3" x 5" with the grain in the 5" direction). I need to determine the 9 orthotropic properties (3 Young's moduli, 3 shear moduli, 3 Poissons ratios). However, I don't want to alter the specimen (e.g., for tensile tests). Can the orthotropic...
Hello --
I have an application that requires a 8" diameter x 3" high disk with supporting ribs and other features. For proper performance the disk must be both stiff and light. The disk vibrates so fatigue is important. Beryllium seems perfect but is too expensive. Aluminum would be suitable...
I'm looking for the manufacturer of a material called Vanox. One website for bicycle saddles describes Vanox as:
Vanox is a proprietary alloy composite of stainless steel, titanium and vanadium, made in Germany. It is an ideal alloy for saddle rails because of its durability (not subject to...
The attached file shows the frequency response for a metal plate (in air) that is being driven at the center resonance by a source that is nominally sinusoidal. The measured amplitudes are perpendicular to the plane of the plate. Some of the amplitudes are approximately 90 degrees out of phase...
I need a small quantity (~ 1 m) of Ti-6Al-4V seamless tubing. The size would be near 1" schedule 40 (1.315" OD x 1.049" ID); the size could be somewhat smaller or larger.
I found a company that could supply this in Grade 2 but not Ti-6Al-4V. Any suggestions?
Thanks,
Don Culp
I need to weld a stainless steel ring (about 2.25" OD x 2.0" ID x .25" wide) to the OD of a 2.0" diameter Ti-6Al-4V rod. The ring is a mild press fit onto the rod along the ring's entire width (prior to welding). The welding should penetrate the entire ring width at the press fit joint. Can this...
It is generally accepted that a compressive stress on the surface of a metal part (e.g., by shot peening or nitriding) will allow higher alternating (fatigue) stress. However, in constructing a Goodman or Gerber diagram (to consider the effect of static loading on fatigue), a compressive mean...
What is the stress relief procedure for Al 7075-T6 including:
1. Temperatures
2. Furnace time at each temperature (perhaps based on inches of thickness or diameter)
3. Furnace atmosphere
4. Cooling procedure
5. Other?
Thanks,
Don Culp
I'm looking for optimization software for use in conjunction with FEA. For a particular design the software would achieve an optimum solution through the following process:
1. Define the objective variables (e.g., Y1 = max allowed stress in part 1, Y2 = max allowed deflection in part 1, Y3 =...
I have a tin material (E = 7.35e6 psi, density = 0.268 lb/in^3) that is uniformly filled with 0.030" diameter steel shot (E = 28.0e6 psi, density = 0.280 lb/in^3). If the steel is 30% by weight of the total and assuming the surfaces of the steel shot are well-bonded to the tin, what value should...
I have a tin material (E = 13.28e6 psi, density = 0.268 lb/in^3) that is uniformly filled with 0.030" diameter steel shot (E = 30.0e6 psi, density = 0.280 lb/in^3). If the steel is 30% by weight of the total and assuming the surfaces of the steel shot are well-bonded to the tin, what value...
