All Questions
22
questions
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38
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Design a string
Consider a string with a mass attached. The string is fixed to the support above, and the mass is hanged at the other end. Is it possible to design the string for the following two cases?
The mass is ...
- 1
0
votes
1
answer
33
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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
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0
answers
10
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Does the magnitude or range of interaction of a force affect which layer dominates the mechanical response of a multilayered structure?
Suppose I have a two-layered material, with a stiff and thin outer layer (high E) and a soft (low E) and thick inner layer.
Intuitively, it feels like the effect of short-ranged forces (e.g., van der ...
- 11
0
votes
1
answer
92
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Does gold have elastic behavior?
I know structural steel is considered to have an elastic behavior and after a certain deformation, it has a plastic behavior.
How about gold metal?
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-1
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1
answer
56
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Which design is most resistant to tipping against 90 degree downward force?
Have a question sort of related to question at (What calculation to find how much force before tipping over?) but with slight modifications.
Trying to weld some tubing together and onto a heavier base ...
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0
votes
2
answers
301
views
Why do two simply supported beams stacked on top of each other deflect more than a single beam of twice the thickness?
If the thickness of each beam in the stacked configuration is 't', the thickness of the single beam is '2t'.
Explanations in terms of Euler Bernoulli beam theory, or any other explanation that is ...
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votes
1
answer
31
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How to find the displacement at each interface of a composite structure subjected to shear force?
Imagine a block made of 3 horizontal layers of 3 different materials (shear moduli S1, S2, S3) and fixed at the bottom surface.
If I apply a displacement 'x1' (or shear stress 'V1') to the top layer, ...
- 11
0
votes
1
answer
53
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How to find out the strain distribution of a block in a simple compression test?
I am performing a displacement-controlled compression test on a square block, where the top of the block is attached to a fixed plate, and the bottom of the block is attached to a movable plate that ...
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1
vote
3
answers
1k
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how to determine the direction of support reactions in a truss?
Hi, I am not sure how to determine the direction of support reactions at point A and K. I know point A has a pin support, therefore, it can take in horizontal and vertical loads and point K has a ...
user38335
0
votes
1
answer
70
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Ideal design for a long fruit plucking pole
I need to design a long (6-7m) pole for plucking fruits from tall trees.
The following are the requirements:
The pole material needs to be as light as possible.
The pole should not be flexible ...
- 3
-1
votes
2
answers
86
views
Strain energy, Conservative force and Potential energy
What I know:
In general, the work done by a conservative force $F$ is equal to the negative change in a potential energy.
$$\int_1 ^2F.ds = - (U_2 - U_1) $$
A potential energy is always associated ...
- 859
32
votes
3
answers
8k
views
Why are two wires used in railway overhead equipment?
While watching the train videos, I came across these overhead wires. After searching on the internet, I found that both catenary and contact wires carry the same voltage and are connected by vertical ...
- 463
0
votes
3
answers
134
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Work done by a force in a deformable body
Consider a deformable body that is acted upon by several forces at different points of application.
Under these forces, the body remains at rest but deforms and the particles have some displacement. ...
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2
votes
3
answers
23k
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Difference between Stiffness (K) and Modulus of Elasticity (E)?
Stiffness (F=Kx) is the extent to which an object resists deformation in response to an applied force. Elastic Modulus (E=Stress/Strain) is a quantity that measures an object or substance's resistance ...
- 57
0
votes
3
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127
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Beam with width tending to zero
Suppose a cantilever beam (of rectangular cross-section) subjected to vertical transverse shear load at free end. If I consider any arbitrary cross-section then both bending and shear stress will be ...
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