All Questions
Tagged with structural-engineering applied-mechanics
34
questions
0
votes
0
answers
10
views
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
31
views
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
0
answers
97
views
Comparison between hand calculations of a continuous beam with FEA simulation (Solidworks)
I've seen many videos and books where statically determined beams' hand calculations are checked using FEA. But why is it that FEA results don't match the ones obtained using hand calculations (in ...
- 15
0
votes
1
answer
53
views
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 ...
- 11
0
votes
1
answer
58
views
Superposition of cylinder stress and normal stress
I need to calculate the principal stresses for the given cylinder with thick walls inside filled with gas shown on this picture:
I used the Lamé equations, namely:
$$\sigma_{x} = p\cdot\frac{r_{1}^2}{...
- 119
0
votes
1
answer
127
views
rotate gear while no keeping it engaged with other gears
i am trying to build a toy where i need gear B to rotate when gear A rotates but when gear B rotate through a outforce gear A shouldnot rotate i hope that explains it well. (:
Both gears are on the ...
- 1
1
vote
1
answer
63
views
How to find the displacement of an arbitrary point on a spring?
Consider a spring fixed from end A and pulled from the other end B. The displacement of the end B of the spring is $x$.
If I take a point at a distance $l_1$ from end A, how can I determine the ...
- 859
0
votes
3
answers
134
views
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. ...
- 859
1
vote
2
answers
216
views
How to solve this complicated truss system?
Below is a truss I simulated in a truss calculator. I'm just wondering, how to solve for the compression and tension of each member and are there any method that can solve this?
My solution is I ...
- 31
2
votes
0
answers
41
views
Bar released from upright position rotates about a lower hinge before being caught by a steel cable, how to calculate the tension on the cable?
I wish to check the safety factor of a steel cable that I've designed to catch a heavy bar that rotates freely due to the gravitational force acting on it.
From the upright position, I'm assuming that ...
- 21
4
votes
1
answer
12k
views
Why is the Stress vs strain diagram preferable to the Load vs displacement diagram?
I’m really unsure what is the difference between stress vs. strain and load vs displacement graphs and why stress-strain is better.
I know that the units are different:
stress is in MPa and the load ...
- 41
0
votes
2
answers
1k
views
Does a change in specimen dimension affect the measured yield strength and tensile strength?
I am having a hard time trying to understand the effect of geometry on a specimen's yield and tensile strength or if there even is one.
If there is an effect or not, why is it so?
Thanks in advanced!
- 11
1
vote
2
answers
807
views
Fixed-Free End Column Design
I am currently working on a problem where I have to design a column. The structure I am currently designing currently takes the following form,
When designing the column, I know that I have to ...
- 47
1
vote
1
answer
857
views
Free pre-processor for Nastran?
I want to do a non-linear analysis (possibly SOL 400) on Nastran. I used PyNastran (python module) to set-up the BDF file for a Linear buckling analysis (sol 105). However I feel like it might be too ...
- 67
3
votes
3
answers
183
views
Is a Geodesic Dome (fuller dome) that floats possible? What material or engineering effort would it take?
Buckminster Fuller has popularized Geodesic Domes (invented by Dr. Walther Bauersfeld who based it on the use of convex polyhedrons), and thus, making buildings with a very large roofs that don't ...
- 31