All Questions
Tagged with strength mechanical-engineering
39
questions
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What is the Hoop stress and bending moment relation
So I am working on a club telescope project. I have to design the tube for the telescope.
So I found hoop stress to be most critical stress.
The tube's bottommost end has a mirror and a mirror cell. I ...
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64
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How to calculate the material and thickness I need for a certain force on it?
I am trying to figure out how to design how thick a material has to be so that the bar shown in picture 1 stays intact when a user is running on it.
Background: The project is a treadmill and the user ...
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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
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25
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What are the change in forces with a ribbon under tension is twisted?
Consider pallet strapping. It has width W. When the strap is flat, it has some maximum breaking strength B.
Now, let's put one twist in it over X feet. Mentally we have a VERY skinny isoceles ...
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2
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84
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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
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1
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53
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Relationship between how fast a metal cylinder can spin on its axis without breaking or deforming?
For simplicity sake consider a solid metallic cylinder which is $2r$ in height with a radius of $r$.
For a given metal and $r$, how to calculate how fast can this spin in terms of rpm for a very long ...
- 65
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1
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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 ...
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49
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Spherical metal ball contains high pressure superheated steam. If we allow it to cool in atmospheric air, at what pressure steel ball will implode?
Theoretically, I know that steam will start cooling slowly at constant volume to attain thermal equilibrium as per zeroth law of thermodynamics. After some time, steam will condense to water creating ...
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2
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84
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Strain As A Function of Deflection of a Hollow Cylinder
I should think that there would be a direct correlation of strain to deflection of a hollow thin-walled cylinder, but I've seen nothing as of yet. I must be missing something. For example, let's say I ...
- 1
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2
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169
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Stress in a L-shaped Beam due to Thermal Expansion
A L-shaped frame $ABC$ (right angle at $B$) consisting of beams $AB$ and $BC$ are fixed at ends $A$ and $C$ to rigid walls. Find the tensile stress at $A$ when the temperature of the frame is raised ...
- 15
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1
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104
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Stress on a statically indeterminate beam with nonuniform temperature distribution
The bar below has length $a$, an uniform cross-section and has both ends fixed to walls. The temperature at the left end is raised by $\Delta T_1$ and that of the right by $\Delta T_2$, where $\Delta ...
- 15
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2
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71
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Resources for strength calculation for an outside aluminium loft ladder and what about it becoming brittle in cold weather?
I have been thinking for years about building an outside stair / loft ladder to climb from a platform to another one, one stair higher (3 meters). However, I never studied material strength, and I don'...
- 139
1
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1
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149
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Screw Calculations/Math
At the risk of every woodworker in the world snickering at me, I'm curious how strong my wood joints are and want to know how much weight a table supports. I'm an aero engineer who ended up in EE, but ...
- 155
0
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2
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344
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Stress-strain Curve Interpretation
A significant barrier to my understanding of typical engineering stress vs. engineering strain curves is that for certain values of stress, there are multiple values of strain (i.e., the stress-strain ...
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3
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593
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Design procedure used in beam design
In the design of beams, the principal stresses and absolute maximum shear stresses are not calculated. Instead, we calculate maximum bending stress using flexure formula and equate it to allowable ...
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