Questions tagged [mechanical-failure]
63 questions
11
votes
3 answers
Why do beverage can tabs break when bent?
Most people have had the experience of moving the tab of an aluminum can back and forth until it breaks off. It usually only takes a few complete back and forth motions before the tab breaks off.
What is the root cause of the tab breaking off?
The…
hazzey
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9
votes
2 answers
How to calculate the pressure a pipe can withstand?
I was looking at high pressure pipes and their pressure ratings. I'd like to know how these pressure ratings are determined.
I assume that pipes are tested until failure, and the failure pressure is multiplied by some safety factor to determine its…
jhabbott
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8
votes
4 answers
Would engineering bricks explode if used to build an oven?
I'm building a pizza oven and, to do so, I bought a whole load of engineering bricks (not these but similar). They've got five holes vertically through them, each hole is 2x6x6.5 cm (80 ml) and the walls, both end and dividing, are 2 cm thick by 6.5…
Toby Abel
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7
votes
4 answers
Is radians a dimensionless quantity?
Quite often while calculating angular velocity we come across the quantity radians per second. How do I treat radian dimensionally?
Rajorshi Koyal
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6
votes
1 answer
Strength of a Vertical Round Aluminum Tube with load cantilevered off it?
Can a vertical round tube safely support a cantilevered arm mounted near the top of the tube?
ROUND VERTICAL TUBE:
6061 Aluminum
2 inch Outside diameter
0.25 inch wall thickness
3 feet height
ROUND VERTICAL TUBE / CANTILEVERED ARM…
serac
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6
votes
3 answers
What is the difference between fault tolerance and robustness of a system?
I am trying to understand the difference in the definition of "fault tolerance" and "robustness" when it comes to system design.
For instance, what would be the main design considerations or what would be the definition of the terms when looking at…
WalyKu
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5
votes
2 answers
Difference between Precipitation Hardening and Tempered Martensite
The textbook "Materials Science and Engineering An Introduction" mentions that:
"Precipitation hardening and the treating of steel to form tempered martensite are totally different phenomena, even though the heat treatment procedures are similar;…
zero
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4
votes
0 answers
How to compare small and large scale model of an IC engine to predict force, torque, rpm etc generated by actual engine?
I have this 6 cylinder radial engine designed in Solidworks.
Rendering
Blueprint (Source:Inventor Wizards)
And I want to perform some motion analysis on this engine to make some prediction about it's feasibility.
So by now I have successfully…
Asker
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4
votes
1 answer
Are Rolling-Element Bearings Practical for Light Loads?
I have a 5" x 4" x 3/8" plastic panel (wall thickness of 1/8", ribbed). I need to slide the panel over a 12" plastic track that is U-shaped (like a skateboard ramp). This motion could be repeated 2 million+ times.
The panel is rigid and maintains…
skibulk
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4
votes
1 answer
How does non-electrical ATEX apply to springs?
This question relates to the ATEX directive, which is the European regulation governing the design of products to be used in explosive atmospheres. In particular, I am asking about the part relating to non-electrical (i.e. mechanical) devices.
Does…
Time4Tea
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4
votes
2 answers
Do yielded columns buckle?
A sufficiently slender column will fail under compression below yield stress by bowing, releasing it's axial elastic strain. This is called buckling. Depending on the slenderness of the column, the buckling may be fully elastic, or may involve some…
Abdullah
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4
votes
3 answers
What is the [PVC] tube or foam in metal springs for?
There are plenty of springs out there which have either a little PVC tube or a foam inside, when I first saw the tube I thought it was probably to prevent the metal spring from bending, but that wouldn't explain the foam that comes with others.
Is…
Hans
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4
votes
4 answers
Calculating maximum internal pressure from maximum rated external pressure?
Is there a calculation / rule of thumb that can determine a containers rough maximum negative pressure (vacuum) from it's rated internal pressure (assuming a single layer construction so there is no additional bracing preventing expansion).
As an…
norlesh
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4
votes
3 answers
How can I apply a fixed and adjustable force to my flexible sample?
I major in microelectronics. I just want to apply a fixed and adjustable force to my flexible sample.
'Fixed' means that the force could be hold for given time without change.
'Adjustable' means that the force would be changed after my setting or…
Nova Koan
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4
votes
1 answer
Oblique cutting implemented in Industrial applications
Oblique cutting generates transverse cutting force which reduces tool life. Oblique cutting involves principal and auxiliary cutting edges in the cutting action which increases friction and advances wear in the cutting tool.
Orthogonal cutting…
Debanshu Thakur
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