All Questions
32
questions
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20
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Determine moment and shear stress door
Determine shear stress and moment of bolt:
Internal Height of Door = 198.2 cm
Internal Width of Door = 89.9 cm
Thickness Door = 3.9 cm
Weight Door = 45.76 kg or448.9 N
Elasticity = 9.8 GPa or N/mm2
...
- 1
0
votes
2
answers
84
views
Failing engine A-Mount (bad design by the automotive manufacturer?)
I currently own a Tata Nexon Petrol car (in India) where I have seen (on facebook, Telegram, WhatsApp owner groups and youtube) that the A-Mount on the engine has suffered multiple failures for some ...
- 101
0
votes
1
answer
48
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Why the size of top and bottom rollers is different in three point bend test?
In a short beam shear testing of polymers, the configuration is such that the top (loading) roller is bigger than the bottom (support) rollers. Why is this the case, and what happens when the size of ...
- 1
-1
votes
2
answers
62
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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
2
votes
2
answers
1k
views
How do I calculate the strength to weight ratio of a material
I want to manufacture something using metal 3d printing. And I'm now choosing the material. Stainless steel is stronger but much heavier than aluminum, so I want to calculate which material can ...
- 31
1
vote
3
answers
1k
views
Failure load of hollow tube under transverse compression
How would one analytically calculate the maximum force a tube under transverse compression can withstand? I am specifically looking for a general equation to model the yield strength of a hollow tube ...
2
votes
3
answers
2k
views
Brittle = highly stiff but not very strong
I was trying to imagine materials undergoing collisions, and thought about materials that do not deform at all. Naturally this is an idealization that does not exist in reality but, if it did, I ...
- 121
2
votes
1
answer
50
views
How is the assumption that stress and strain are elastic everywhere is valid for STRESS-LIFE method for fatigue life calculation?
Stress life method is generally employed for high-cycle fatigue (HCF) applications. while HCF region is approximated by $\sigma=a(N)^b$ which gives a linear graph on log-log scale, for steels it ...
- 41
4
votes
6
answers
640
views
Increasing torsional-stress resistance of an Auger at its motor-shaft joint
An auger is used to move plastic balls and is rotated by a stepper motor. Due to the balls getting jammed sometimes, this induces stress on the auger at the motor-shaft junction and breaks. Images ...
1
vote
3
answers
296
views
Equivalent sheet metal thickness of different alloys
I want to replace steel plates that are being used as trim tabs on a boat with 90-10 cupronickel. The main design parameter is to make sure the plate has no less flex than the part being replaced. In ...
- 1,635
0
votes
0
answers
39
views
Filler Material
If I was to add a filler to a metallic substance, is it possible for the Young's modulus to decrease as filler content increases?
Also, when a filler is added, how do the atoms change for improving ...
0
votes
0
answers
30
views
Which will be stronger for securing a cantilever umbrella in a deck
I am securing a cantilever umbrella baseplate to a deck. The decking timber will be reinforced with a pine nog between the deck joists.
The options that I have are to use 10mm stainless steel coach ...
- 1
0
votes
3
answers
307
views
Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section
Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the legs having an internal angle of 80 degrees, made from 100 x 100 x 4mm 316L ...
- 9
0
votes
2
answers
790
views
What is the white fiber in the copper wire of headphones?
I got a pair of in-ear headphones, broke the left earphone, bought another set, broke the right earphone, and joined the leftovers of both. I found white, grey, or beige fibers near the copper of the ...
- 161
6
votes
1
answer
32
views
What is strain/loading rate dependence/sensitivity of compressive strength of brittle materials?
What is the definition of strain/loading rate dependence/sensitivity of compressive strength of brittle materials? Is it general strain/loading or it is specific for the brittle materials?
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