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I am doing a similar task as WK95 is, learning to design with composites by hand and have a related question that I think warranted its own posting. I'm using Barbero's book and am in micromechanics having just read the thermal expansion section-you calculate the CTE properties of the laminate...

Good morning all, I have been focusing only on the first (lowest) frequency and calculate stress and deflection results based on that value as Steinberg indicates that this is where the highest deflection takes place. Why is this the case? If I wanted to calculate the results for higher modes...

Hello, I have an application that will have short term (~1hr) exposure to a hot environment which may be as high as 300-325 F. In looking at what I have used before for similar items (7075-T7351, tho only to 275 F) and possible alternates I came across 2024-T8 which (using mil-hdbk-5 data)...

Hi, This is a new area for me and I have a really basic question on the pressure vessel code. Under what conditions does it apply? For instance, an R&D project needs an unfired pressure vessel. Can we design this ourselves without it being certified as long as we follow the code requirements...

Hi, I am working on a home project that puts a small LCD display on the dash of the car. I'm using a plain rectangular plastic enclosure for the display at the moment but am looking for something that looks a little better, maybe triangular in shape, roughly 5" long, 3" vertical and about that...

Hi, Does anyone know of a source a CAD model (stp or igs would be fine) of the Ford Kent 1600 engine? I need only the external configuration for designing an installation. I can get access to the real thing but it is several hundred miles away so thought I'd try this first. Thanks, Bob

Hello Everyone, My company has extensive job descriptions for engineers, but nothing for designers. I've googled this and haven't come up with anything satisfactory. Our designers make mechanical designs using CAD of machined parts and complex electro-mechanical assemblies. What I am looking for...

Hi, I'm designing some parts that are to be fitted into a high vacuum system. They consist of a large (5 inch diameter) threaded part (like a bolt)and a mating nut-materials need to be stainless steel type. I have been planning on using Nitronic 60 for one of the parts but am not sure about the...

Hi, I don't work in the aerospace field but am adapting some of our equipment for use on a military aircraft application and am having trouble identifying NAS/MS fastener part numbers. Our customer has offered to help with this but they are swamped and have not been able to provide any guidance...

Hi, I am a newish user and am having trouble making a simple lofted part. The error that I consistnetly get is that 'the guide curve is not valid. It does not intersect with section 2'. The section 2 comment varies depending on which sketch is selected first. My profile is circular to square...

Hello, We are doing some testing of Jet A and the issue came up of additives. Our vendor tells me that a product called diethylene glycol monomethyl ether is added to the fuel to enhance the fuels lubricity, but he doesn't have any details on this. A google search revealed that it inhibits...

HI, I have a few questions on ASME BTH-1-2005. Para 3-2.3.1 Strong Axis Bending of Compact Sections If the member is loaded in the strong axis (x-x) what does the comment 'loaded in the plane of the minor axis' mean? Isn't the minor axis the y-y? Thanks, Bob

I have been reviewing some of the models in the book 'Building better products with FEA' by Adams and Askenazi and am having trouble with the boundary condition examples that they use with the link on page 295. The link is a tension member loaded by forces applied on 2 pins. In example '8.16a'...

Hi, I have successfully used urethane materials to pot electrical items subjected to vibration but now have a new problem, items that are immersed in oil. The parts are simple in design and everyone who has come by with their 2 cents has said that the oil will dampen the vibration, but I need to...

I am looking into making a weldment of 5052-H32 sheet and 6061-T6 machined parts. I have seen a number of posts on this forum concerning this, but none address the strength of the resulting joint. There is plenty of info available on self mated joints from these materials but I have not found...

Hello All, New user question, why don't all dimensions used to build a model come in to the 2d drawing? I still have to create a number of dimensions for each drawing. I'm not the only one who does this apparently as I see 'grayed' dims on other peoples drawings as well. Thanks, Bob

Hello All, I am interested in learning ansys on my own for structural analysis. Has any one had experience with the 'ed' version? I will use the included DesignModeler for geometry creation, any comments on that? Thanks, Bob

does anyone know of a source for solid models of circular electrical connectors? They are time consuming to make and our usual vendors for them have been no help in this regard. Thanks, Bob

We are on wildfire 2. I have a cylindrical part (a pipe essentially) that needs a square hole cut thru the side wall. I have tried the solid protrusion command but when I get to where I need to remove material this button is grayed out! Also tried to sweep it, but same problem, the remove button...

Hello, If I have a cylinder of carbon dioxide in liquid form at a given pressure and temp, how do I go about determining the volume of gas that I can obtain to power some pneumatic equipment? Thanks, Bob