How wide of a plate strip are you using to calculate the composite section properties? I have always found this to be a challenge. When I have designed similar items I lean toward a narrow strip and then look at plate bending between stiffeners. In this case, assuming it is a critical item to...
Make sure you read up on how STAAD is showing results. You can see a Von Mis stress in results but that is a calculated stress RESULT. I tried to find a link to the STAAD technical reference but couldn't. The value in the results has nothing to do with any calculated allowable stress.
In my...
I am not sure what you are designing but plate buckling is a complex subject. I typically use Blodget to get an idea of buckling stress and then stay well away from that.
Thank you to everyone for your replies and sharing your experience.
Client isn't sounding too keen on the idea right now. Mainly because it is nearly impossible to keep structures cleaned off in the field.
I am still going to rough out cost differences and will update the thread.
I work in mining and am in the process of designing a replacement 90' truss. This is a limestone facility and the truss will be part of material handling system. Corrosion is a significant problem at the site. In the past we have used a lot of HDG but that can be hard to do on larger trusses...
TugboatEng regarding the epoxy joint. My first thought is the differential movement of the Ti and CF hull due to different thermal coefficients and E would have to be taken in the joint. Either creating large stresses across the joint surface or (if the epoxy is strong enough) large forces in...
Regarding liability in one of the videos the CEO talks about working with Boening on the pressure hull. I wonder how long before they try to distance themselves from this fiasco.
I was looking around and found this article on the carbon fiber hull maker.
https://www.compositesworld.com/articles/composite-submersibles-under-pressure-in-deep-deep-waters
Link
Quite a read, delegated design and six weeks to do it. I assume that is design and fabrication. Now I am...
When I read about the pressure hull construction (Ti end's with carbon fiber composite middle section) I had a gut reaction this is not a good idea. Two different materials, differing modulus of elasticity and thermal expansion coefficients would make for a very challenging analysis. Then...
I don't do a lot of work like this but when I do I try and use smooth bars to connect between foundations. My thinking is I want to prevent differential vertical movement and transfer some out of plane loads. I also want to avoid vertical shrinkage cracks past the dowels. By using smooth dowels...
It looks like I missed the entire point of the original post.
To clarify I am not suggesting use of prescription drugs as a cure all. My point as that we can think of ourselves as complex machines and apply engineering thought process to improving ourselves. One of many ways to approach this...
I am a one-man operation myself and used to use Quickbooks until it went to subscription then I changed to Quicken but now that has gone to subscription so I am looking for another option. Right now I am planning to give Bookkeeper a try.
I mainly need to make invoices and track expenses for...
I don't want to sound like a late-night infomercial but you might go get your testosterone level (assuming your male) or perhaps similar female hormone level if that is the case. I did a bit of research on this topic and TRT, I'd suggest first going to LabCorp (assuming you are in the US) and...
On grout spacing I usually go 1.5" to allow room for reduced grouting height without having to switch from cementous grout to epoxy. I's been awhile since I looked into the details but I believe around 3/4" gap you have to use an epoxy grout.
I recently had some pull testing done to verify...
You will want the loading area to be very rigid to prevent belt tracking problems. I have never added anything extra for material impact because in my work operating material flow and impacts are usually low. I like to design chutes with rock beds around the loading zone so material flow isn't...
I marked up your sketch assuming you are working with some type of granular material that will provide some arching action.
The chute doesn't look that big so if you wanted to be conservative you would figure the material in the chute to be chute outlet area times maximum material depth times...
I am a little confused but I think you are asking plugged loading chute and material weight sitting on the belt. In such a case I would expect arching action of the material to keep plugged material weight off the belt.
You might find some useful information on belt feeder design if I...
Here what I do
1. Plug load is chute completely filled with what ever material you are working with. This is most significant on structural supports. For the chute itself I will usually do the side load as ko*depth*bulk density. I usually use ko=0.5.
2. I do conveyors at full CEMA capacity...
As a practical matter channels wouldn't free span very far without running into slenderness issues. Secondly I noticed you are in mining, channel webs can be thin so wet material sitting on the back of a thin web would rust through faster than a thicker angle leg.
In my designs I have used...
