All Questions
Tagged with materials structural-engineering
104
questions
8
votes
3
answers
1k
views
How does a church built from stones survive 70 years under water?
Following the recent news about the Sau reservoir in Spain, the draught revealed an 11-century stone church which has been under water for 70 years since 1962 when the reservoir was built.
How is it ...
- 300
0
votes
1
answer
33
views
DLC wear resistance
I read that a thickness of one micrometer of DLC coating (which, if I understood correctly, shows similar properties to diamond), increases the lifespan of an item plated with it from a week to more ...
0
votes
3
answers
113
views
Can someone help explain the difference between strength and stiffness?
I just can't seem to get it through my head and I don't understand the difference. As far as I can understand, strength is a materials resistance to permanent fracture while stiffness would be ...
0
votes
0
answers
64
views
Belt conveyor roller spring
I wanted to know if anyone could help in this area.
I want to create an inclined conveyor belt where, when a cargo box reaches the top of the conveyor belt, the rollers sequentially move down (maybe ...
0
votes
1
answer
87
views
Does yield point of steel depend on thickness?
I have two different plates of different thickness and I need to calculate yield point. Does yield point of steel plate changes with changing of plate thickness?
5
votes
1
answer
138
views
Creep of the materials
Does creep exists for all materials at any stress at room temperature? I searched for this and could not find any answer other than creep isn't significant at low stresses and low temperatures. What I ...
- 153
1
vote
0
answers
90
views
What material performs best in this situation?
Take a long, thin rod, say .25 mm in diameter and 200 mm in length.
Filling these fixed dimensions, what kinds of materials could the rod be made of such that it minimizes how much the rod bends under ...
- 11
0
votes
2
answers
141
views
What are good insulators aside from glass?
The insulation properties of glass is apparently a factor in its popularity in modern construction.
Natural stone, by contrast, is a poor heat insulator.
What are some other building materials, i.e. ...
- 101
-1
votes
2
answers
62
views
What does cycle mean in fatigue strength diagram?
A shaft at an usual factory might rotate 2000-3000 (10^3-10^4) per day. So, its rotation cycle easily reaches numbers indicated on X axis below. What does number of cycles in the diagram below exactly ...
- 125
0
votes
1
answer
158
views
How much force is acting on the screws I used?
Years ago I built a vertical rack to store long lengths of wood. The rack was built using 2x4" pine scrap. Imagine a typical wall assembly with a single top and bottom "plate" (2x4) ...
- 1
0
votes
1
answer
122
views
What is the best pattern of lightening holes to drill vertically (i.e. along the transverse plane) through a rod of aluminum
I have a 5' long, 2" diameter piece of aluminum round bar. I want to make it at least 30% lighter, while preserving as much rigidity as possible. (The force I'm most concerned about is torsion, ...
- 101
1
vote
5
answers
122
views
Alternative to super glue
I have used my PCB bottom as part of my outer casing (bottom part). To do that I need to glue the PCB on my ABS (upper) casing. A special 1,5 mm line/area is used in the casing and on the outer ridge ...
- 11
0
votes
3
answers
320
views
Relation between welding bead and outer diameter of a pipe?
How can we find a relation between welding bead and outer diameter of a pipe? Welding bead is inside of the pipe and I am using M.S. pipe.
Dimensions are listed below:
Pipe OD=25.4mm
Thickness=2mm
...
- 57
0
votes
1
answer
33
views
Is half of depletion region a part of N region or P region?
Is it correct to say that if the P-N junction is in the middle of the depletion region, half of the depletion region is for the P region and the other half is for the N region?
- 1
1
vote
1
answer
677
views
Up to what temperature, can titanium be safely used?
I was thinking about the realization of a pottery oven, and I wondered which material I could to make the inner walls. Most often the inner walls seem to be made of some kind of hard mineral wool. I ...
- 139