Questions tagged [strength]
This is to be used for topics regarding the strength of materials, the analysis of internal forces in a body and all the governing principles which considers deformation of bodies.
138
questions
0
votes
0
answers
18
views
Steel tubing size question for building a giant swing
a customer has asked me to build a giant swing that will be suspended between two trees in a forest near their home. The swing will need to be 12 feet wide and could end up supporting eight or nine ...
1
vote
0
answers
18
views
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 ...
0
votes
0
answers
64
views
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 ...
0
votes
0
answers
21
views
Techniques to make residential buildings more blast resistant
There are generally two approaches:
First: use stronger materials (e.g. thicker RCC with fibres, go underground, etc).
Second: for any given material, use a superior design.
The First approach is ...
0
votes
1
answer
58
views
Conflicting steel strength Vs temperature graphs, NIST NCSTAR vs Engineering Toolbox
This graph is from NIST NCSTAR 1-6C
And this graph is from the Engineering Toolbox.
As you can see, neither the NIST yield or tensile curves match with the ET structural steel curve. Why? And which ...
0
votes
1
answer
25
views
What is the shear force at point B? Is it +P or -P or zero? I am not able to find any source that gives the right information
I am not able to understand here that what should be the value of Shear force at point B. It seems to be a discontinous point, as there is point load there, but can we say about the exact value of ...
0
votes
0
answers
252
views
How much weight can aluminum square tube support?
I'm building a bed platform in a campervan and trying to determine what type of aluminum tube to buy.
I'm thinking to purchase 6061-T6511 aluminum Square Tube with 1.5" width, 1.5" height ...
0
votes
1
answer
88
views
Twisting of thick ring due to internal pressure
I have an axisymmetrical part that is subject to an internal (non-constant along the inner border, but constant in time) pressure (among other loads, but this is the one I am interested about) and I ...
0
votes
0
answers
30
views
Fabricating a Strong Hub Shell for a Bicycle
I'd asked this question over at SE Bicycles but they think this is more an engineering question.
The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
0
votes
2
answers
50
views
Fabricating a Strong Hub Shell for a Bicycle
I'd asked this question over at SE Bicycles but they think this is more an engineering question.
The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
0
votes
0
answers
20
views
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
...
0
votes
1
answer
12
views
Is it possible to model the connection of pre-cast and site cast concrete beam on FEA software such as Ansys?
I'm looking for a way to compare the joint strength of beam-to-column connections of pre-cast and site cast concrete. Is it possible to do this on a FEA software?
0
votes
0
answers
23
views
2" o/d aluminum pipe (1/4" wall) used as 10' 'axle' to 'roll' dock out of water
I'm curious how much weight this 'axle' could support? The dock wheels on ends are capable of 700 lbs each.
The dock itself is 10’ wide. The axle will be placed under two 4’ x 2’ rigid black nylon ...
0
votes
0
answers
25
views
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 ...
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 ...
0
votes
1
answer
53
views
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 ...
0
votes
2
answers
157
views
Optimal shape for cantilever beam subject to body weight only
How can I find the optimal shape of a cantilever beam subject only to its own weight, and having the following restrictions?
The cross section is a rectangle
Only the height of the rectangle can vary ...
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}{...
0
votes
1
answer
46
views
Predicting breaking force of beam per length based on one testing
I've made a plywood carbon sheet and tested its breaking force, for a 200mm long, 50mm wide, 16mm thick it was 100kg +-
I was wondering if it's enough to help me predict what will be the breaking ...
0
votes
0
answers
18
views
Angle of twist at D where 2 shaft connected through gears
So my frind and I find the answer for part A different also chegg says something else. But I can't see whats wrong with my answer. Dont expect you to solve it just show me whats wrong with my answer. ...
0
votes
2
answers
52
views
How can a material be good at damping, yet also be strong?
Good Damping
Carbon bicycle frames have the unusual property that they are superior to aluminum frames in high-frequency absorption. A cyclist on a carbon-frame bike will feel tarmac chatter far less ...
-1
votes
3
answers
60
views
Why are the water tank walls made of stretch film warping a lot whereas theoretically they shouldn't that much?
I am building a water tank of custom dimensions (1.5 m x 0.72 m x 0.86 m) out of stretch film. The stretch film is wrapped around a steel frame (see here for more info on this open source project).
I ...
0
votes
1
answer
48
views
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
votes
2
answers
62
views
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 ...
0
votes
2
answers
29
views
Is the a similar method of calculating moment in inelastic bending like in the case of torque for inelastic torsion?
When calculating for Torque in torsion or for Moment in the case of bending, the concept is usually first introduced with the simplification of the assumption that the stresses and strains are in the ...
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 ...
0
votes
0
answers
49
views
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 ...
0
votes
3
answers
92
views
Resultant Forces in a vertical rod
This is a pretty basic question. So in the below figure is the representation of prismatic column. The forces are represented as P1 and P2. let x be an arbitrary cross section between A and B. The ...
1
vote
0
answers
27
views
Could electromagnets ever compete with the power of an antimatter annihilation engine? [closed]
So to make this easier to read, I've been using a few terms I'll explain really quick
"MPP": (maximum physical potential)
"MASS": (maximum atomic structure strength)
According to ...
1
vote
0
answers
41
views
Why are these food stretch films (LLDPE) holding one one-thousandth of the weight in reality than what is expected from the datasheet values?
I am trying to reproduce analytically the results found in this experiment where a weight of 3 x 5 lbs (6,8 kgs total) breaks the cling wrap (LLDPE) which is stretched over a medium size cooking pot.
...