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1500 questions
5
votes
2 answers
Term for double slope from street
One of the places I frequent recently had the curb and sidewalk rebuilt by the city. Previously, there was a roughly continuous transition from the street to the rest of the private drive next to the building.
After the rebuild, the sidewalk was…
user16
5
votes
1 answer
Shear Force Diagram of a Simply Supported Beam with triangular load distribution
I've been attempting this fundamental shear force diagram problem for several days, but can't seem to get the correct result. I'm trying to calculate the shear force diagram in terms of $x$, but I'm unsure about the intensity $w(x)$ of the…
AVelj
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2 answers
Should I discard part of the data (steel traction test)
(please excuse my bad English. I don't speak English)
I have to deal with an old hydraulic machine, recovered from a deposit. I have no knowledge on mechanical engineering. Only civil engineering.
The machine is for doing traction tests on steel…
zexot
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5
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1 answer
Design behind typical keyed construction joints in concrete walls
Construction Joints
Construction joints in concrete footings or walls are places where the concrete pour can be stopped so that everything doesn't have to be poured at once. Later, once the concrete has hardened, the next part of the concrete can be…
hazzey
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5
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2 answers
Fluid mechanics cauchy's stress tensor
Is cauchy's stress tensor symmetric always?Does this symmetricity hold in accelerating and non-zero cross velocity gradient flow field?
Mohit Saini
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5
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2 answers
How is steel tempering addressed when installing pre-heat rivets?
AFAIK when you heat up a piece of steel to high temperature and let it cool down slowly (as opposed to shock cooling by say submerging it into water) steel gets softer - that's called tempering. Steel getting softer means it can bear less load…
sharptooth
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5
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1 answer
Are stress concentrations a concern when replacing rivets with high strength bolts?
A common method of repairing old riveted structures is to replace any damaged rivets with new high strength bolts.
When this is done, the new bolts are typically installed like they would be on a new structure which results in a bolt pretension. My…
hazzey
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5
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1 answer
How to calculate a modified sine curve?
I am designing a two dimensional cam profiles. I want to use the "modified sine" method for drawing the position and angle changes. (see attached sketch). The modified sine curve is actually a combination of cycloidal curve at the first and…
birdman3131
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5
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1 answer
How do I model a longitudinal tensile strain in a laminate composite using Abaqus software?
I want to be able to measure the strain response in a material composed of 2 lamina, bottom one (0) top one half (0) half (90), and see the differences in the unidirectional versus the bidirectional area.
I've been trying with the Lamina function,…
LDPC
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5
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2 answers
How do I calculate the gear ratio to lift a weight at a constant speed?
I have an 80 g·cm motor with a rotational frequency of 15,000 rpm. I want to lift a weight of 2 kg at a speed of 0.5 m/s. How do I calculate the gear ratio required?
lee wei
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5
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2 answers
Upper bound for von Karman Vortex Street?
I'm trying to see if I can find any literature on this specific question, but a few days of scholarly digging has been fruitless.
Given a 5" round pipe with a bluff body inserted, is there an upper bound for the Reynolds number at which the von…
Ramrod
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5
votes
1 answer
Optimal size and shape for a steel target?
Problem
I'm building a steel target for long-range rifle shooting. For those unfamiliar, the purpose of the steel is to produce a loud "PING" when the bullet strikes the target. It's very fun.
Since I have a variety of materials to choose from, I'd…
Hundley
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5
votes
1 answer
How do engineers deal with sinkholes?
Sinkholes have been known to occur in the middle of cities or other locations where they affect buildings:
Some areas are more prone to sinkholes than other areas because of the presence of old mines or limestone bedrock. Even in these areas where…
hazzey
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5
votes
6 answers
Why don't public transport networks have more routes to each terminal?
When using public transport, we often need to change routes in the middle of the journey. These changes have costs – I can think of the following, but there may be more.
If we're reading, working, etc. on board, we need to take a break, losing…
Yngve Høiseth
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5
votes
2 answers
How to select a low flow rate diesel flow meter
I need to select a precise flow meter for the following application condition:
Flow range: 0-150 liter per hour
Medium: Diesel
There are so many meters on the market that I am a bit lost. How do I determine whether a flow meter is acceptable for…
Maruf Hossain
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