All Questions
11
questions
0
votes
1
answer
38
views
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
2
votes
0
answers
87
views
Thermal Expansion and Stress in a Heated Beam
Consider the case of a beam that is supported in such a way that expansion can occur freely. Suppose that the beam is heated in such a way that the temperature varies with the depth of the beam. Let $...
- 21
1
vote
3
answers
1k
views
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
-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
0
votes
1
answer
765
views
How do I properly scale down a force for scale-down model testing?
I am designing structural frame for a shipping container that would have 8000 lbs of weight stacked on top of it. Of course, i don't access to real size container. I have built a model whose scale is ...
- 1
0
votes
1
answer
80
views
Neutral axis and 2nd moment of area [closed]
Does anyone know how I would find the horizontal neutral axis (yc) and 2nd moment of area of this cross section? (R = 210 mm) I know that and that there needs to be the same amount of area on either ...
- 103
2
votes
1
answer
263
views
What should be the relation between flange length and web thickness for an optimum I - beam?
While learning about I-beams I became curious to know if there is any relation between the flange length and web thickness of I-beams or if its arbitrary.
- 23
0
votes
2
answers
285
views
Given the same diameter and height, which is stronger? A vertical standing cylinder or a vertical standing rectangular?
I am interested in two cases. Case 1: Both are solid. Case 2: Both are hollow with the same wall thickness.
- 31
3
votes
3
answers
324
views
What exactly is Hooke's law defined for?
I used to think that Hooke's law was a relationship between how much a bar under uniaxial loading deformed and the internal force (per unit area) that developed within that bar. But this clearly isn't ...
0
votes
0
answers
71
views
Choice for HEAVY blacksmith table
I have an old 7,000 lb. blacksmith table (I had it weighed at truck stop). Similar to the one this man has:
Sorry for the size of the pic.
I need to lift one end the way he is doing and I have a farm ...
- 1
0
votes
3
answers
651
views
Truss Analysis Problem
In this case, L, theta and P are given, there will be 4 reactions at the wall? (2 horizontal and 2 vertical).
$$\begin{align}
\sum F_v &= 0 \therefore F_{v,B} + F_{v,A} = P \\
\sum F_h &= 0 \...
- 11