Corolla 2010 CE (Canada)
I was hoping the floor pan would be excluded from the cross-section, or that is is substantially thinner in original design than the adjacent beefy member, in the frontal impact case.
I am pretty sure there is no issue in normal service. I am certainly not expecting...
All,
I am a structural engineer primarily working on stress-skin structures - railcars, etc with a good knowledge of effective widths, stability etc.
Is a floor pan in an automobile considered structural? I have corrosion on a drivers side pan adjacent to what looks like a 4 x 4 cross-section...
All,
2 questions:
1) Is it possible to get chromium carbide precipitation in a low-carbon stainless steel grade, such as AISI 301LN?
2) Will passivation of 301LN stainless prevent carbide precipitation?
Thanks!
tg
Hello welding experts,
Does anyone know why modern North American structural welding standards do not cover Plasma Arc Welding since the mid-70's? Have we decided it is no good? Has it gone out of favour?
tg
Hi all,
Rail question on Forum with lots of stressed skin experts:
Any examples of semi-monocoque designs with really large openings? Imagine a stressed skin rail car with a 10ft wide x 15 ft high basic rectangular cross-section, 80 feet long, and openings are desired in roof measuring about...
Hi all,
We have always protected broken ends of Huck bolts with zinc-rich paint, when using C120 Grade 5 steel pins. It it a good idea to to the same with stainless steel C6? Or will the zinc-rich paint make it worse?
tg
I really appreciate the free metallurgical advice...
Any suggestion of what I would compare the hardness value against?
Non-welded areas?
In the meantime, we will do a literature search of rail industry standards related to toughness of such assemblies.
Please do not hesitate to suggest what...
The welding info is not at hand, but most likely SMAW with E7018 electrodes.
The item that was welded was a grade 8 nut, and this was eventually removed and all welds ground smooth with grain marks in the direction of principal stress.
Weld was in a very low stress region.
tg
Another clarification:
This is A514 steel plate that was cut and machined, not a casting.
Fy=90 000 psi
Fu=100 000 psi
According to :
https://www.onealsteel.com/alloy-steel-plate-a514.html
it is known for its high strength, weldability and toughness even at low temperatures.
Any thoughts?
tg
Hi all.
If a high strength steel casting (ASTM A415) has inadvertently been welded to, I understand that low temperature notch toughness may be effected. Any guidance on how to evaluate how much it has, how to assess it, and potential methods of restoring the lost toughness?
Casting is part...
Hi all.
We are trying to size a steel member that will receive impacts from a Caterpillar excavator bucket's bottom edge (with teeth!). Think of this as a steel pad welded to a flat steel floor. Can anyone suggest a design load for the pad to floor connection if the bucket is expected to...
Does anyone have any guidance on evaluating block shear (tear-out) for a tension-loaded deep channel (C-section) only connected at its web, with a series of elongated ring welds? Can I assume the same fracture paths as with a bolted joint or is that too conservative?
tg
jgKRI - that sounds promising.
Our other option is switching to counter-sunk fasteners. Assuming this remains a bearing-type connection, does anyone have opinions/references for:
1) Static strength (bearing strength) design equations
2) Fatigue strength of such a connection
My guess is that...
All,
Does anyone have a reference for the fatigue behaviour of bearing-type bolted joints in a counterbored hole? Main loading is shear alternating between zero and a design value. I imagine there is quite the stress raiser at the edge of the bore. This is for a steel freight car.
Thanks!
tg
UcfSE,
I'll check it out - thanks. BTW, in my haste to compose the OP, I confused EC3 Part 1-9, with EC9 Part 1-3. I am really looking at EC3 Part 1-9 (Steel structures, fatigue), so your reference is right on.
tg
The IIW references seem really appropriate for my needs.
http://store.elsevier.com/product.jsp?locale=en_US&isbn=9781845691240
Table of contents seems right on topic.
tg
Hi all.
There is a multitude of fatigue information out there. However, can you guys suggest references (articles, texts, standards) that are clearly explained and user friendly? We are looking at stress-life methods, using AWS D1.1 or Eurocode 9. EC9, by the way, is not user friendly.
What...
