What is the physical significance of the RMS of acceleration data. I have read that it is a measure of energy. What would the units be? Is there an integral function to describe this? Can anyone expand on this a little?
Thanks in advance
I am looking for a general relationship between the thickness of an exhaust tube and the amount of vibration and sound. Does anyone know where I can find equations relating these. Will other factors (length of tube exhaust pulse frequency and amplitude) effect vibration/sound in a way that...
I have a problem with a suspension system were the center of gravity is not at the geometric center. So, under static load each spring is loaded differently. I would like to find the deflection at each spring.
To analyze the problem I set up a very stiff plate and put a spring element at each...
I am trying to determine the friction created by an O-ring seal in an ocillating application. The application is like that of a facet handle where motion is limited to about 90 degrees. The result will be the force required to turn the valve handle. I have found equations for fiction in...
I have an aluminum bending process involving complex extrusion shapes. Currently we use small steel shot to fill the tube before bending to keep it from collapsing. However, some of the extrusions are large and get very heavy when filled with steel. Are there other types of materials or methods...
I am working on a problem concerning the compression yield of plastics due to expansion from heating. Does anyone has thoughts or information on the response of plastics in this type of case?
Here is brief description of the problem:
If I were to constrain a bar at room temp so that it could...
Why does frost form on metals easier than other materials like plastic. Is there a stronger chemical bond between the metal and water? Does the specific heat have an effect?
Thanks
How does everyone analyze a problem where cold forming has changed the material properties in certain areas.
Example:
Geometry: A simple "L" bracket cold bent from flat steel.
Loads: Turn 45 lke a "V" and pull apart like <- V ->
Properties: ???, The material propties will be different...
I am posting these thoughts and questions in regard to Von Mises failure criteria and comparing it to experimetnal results. I am curious as to how everyone verifies models against experimental data.
With respect to Von Mises(VM)stress criteria the books define failure as a stress above the...
I have a situation where I am looking for a job while I have a job and i have not told my employer. I have MS and I really like my job, although my pay is low, but I only have a little over year experience(besides co-ops). I would stay except circumstances requrie that I relocate eventually...
I am working on a plastics problem where there are a variety of formulations with a varitety of strength properties. I can see that when the material Modulus of Elasticity, E increases the yield strength does as well, and vice versa. Is there a real realationship here? If I get a range of E...
I am working on a heating element for snow and ice. I was wondering what type of material works well for a heating element, I am guessing something with high resistance and high melting temp.
I am working on a problem that involves heat generation to maintain the melting of snow and ice. Would it be correct to use a film coeficient of water at a constant 0 degree C temp. With this method I will be neglecting air temp less than 0, my worst case condition is around -40 C.
Thanks in...
Has anyone done square tube bending with a three roller system? This is where a straight square/rectangular tube is passed through a set of rollers which induces a curve in the tube.
Also does anyone know of good reference material on this subject?
Thanks
EngForm78
Does anyone have information on the average price of raw material for a given plastic from say 1980-2005. Also, are there projections on the prices for the next 10 years, increase or decrease, and by how much. The plastics of interest are the basic commondity plastics.
What I hope to see is...
Has anyone seen benchmarks for a solid square or round bar in torsion with a traverse hole.
According to "Peterson's stress factors" book the max stress should be inside the hole. In my FEA analysis it is on the outside.
Thanks in advance
EngForm78
Has anyone seen benchmarks for a square or round bar in torsion with a traverse hole. I am working on a simplified model of a L-bracket and working up to the more complicated analysis.
The actual part is a "L" bracket with a bolt connection, and thus a bolt hole. The force applied is such...
I am trying to predict failure for a cast zinc material. I look at the contour plots which give me mises stresses. But, how do I know if I am outside the failure surface? Also, I have Abaqus/explict so this may be my limitation. Any reccomendations on how to choose a failure criteria for FEA...
