Questions tagged [stresses]
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198
questions
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0answers
12 views
Finite element welding simulation with commercial software? [closed]
I am looking forward some libraries/add-ons to perform welding simulation (thermomechanical coupling, steel alloys) using commercial software, like Ansys or Abaqus. My aim is to determine better ...
0
votes
3answers
66 views
Buckling of Parallel rods
I am trying to calculate critical force $P$, if two rods (same diameter and length - rigid fiberglass sandwiched on two steel plates) are parallel to each other.
$$
P = \frac{\pi^2 EI}{(KL)^2}
$$
I ...
1
vote
2answers
37 views
The behavior of the stress-strain curve of metal, containing a void
Let's assume that in a metal sample without any dislocation, there is a void. Then we conduct a uniaxial tensile test.
(1) How does the stress-strain curve change, when the size of the void increases?
...
0
votes
1answer
414 views
What's the best way to design a joint with two fasteners?
When you're trying to design a relatively long joint with only two fasteners, what's the best way to arrange them? Since fasteners effectively radiate a circle of clamping force around them, what's ...
2
votes
2answers
65 views
Why is the thin-walled cylinder more likely to experience failure along its axis than along its hoop/circumference?
I was watching a YouTube video to understand the concepts of hoop/circumferential stress and axial/longitudinal stress in thin-walled cylinders and their formula derivation.
So the formula of the ...
1
vote
0answers
15 views
Should I use ST or LT values for extruded rod?
In MMPDS for AA7075-73511 (extruded rod) the Table 3.7.10.0(g3) show both ST and LT values for transverse directions. For a rod with circular cross section there is really no Short and Long transverse ...
1
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0answers
18 views
Limit state design/ LRFD of short steel columns
Why do we use the yield strength as the limiting strength in short column design when using limit state design.
Why is the full capacity of the material not utilized (as is the case with beams when we ...
-1
votes
2answers
41 views
Other than yielding, what type of stress you check for ASD?
ASIC 360-16, in page pdf 330, it says
"For any single element, there may be a number of different allowable stresses that must be checked."
I can think of yielding. What else?
Rupture for ...
2
votes
1answer
69 views
Shock loading stresses due to falling: what strength to use for acceptance criteria?
We are evaluating a design in which a fall-arresting safeguard would be subject to a shock load in the event of a catastrophic failure of a different component, which is required to meet compliance ...
-1
votes
2answers
41 views
Calculate elastic modulus of titanium [closed]
I would like to work out the elastic modulus of a specific grade of titanium.
Further to this I would like to learn how to calculate the maximum tensile strength of that metal in relation to its cross-...
4
votes
1answer
56 views
Why is fillet weld assumed to be in a state of pure shear stress?
According to Building codes, when calculating the maximum load a fillet weld can take, one checks only that the stress in pure shear is below the maximum shear strength. We know that shear yielding ...
-1
votes
1answer
36 views
simply supported beam with a midspan load
First off non-engineer apologies,
A plate of 5251 Aluminium is used to support the load of a centrally seated human I estimate a load of 1 kilonewton.
The beam measures a length of 1000mm, 100mm wide.
...
1
vote
3answers
87 views
Beginners material science for handling a load
I’ve got a reasonably strong grasp of Newtonian mechanics, but as far as material science goes I don’t know which of the many material properties I need to use to solve my problem:
I’m trying to mount ...
1
vote
2answers
45 views
Reduce stress on holes
I have an aluminium bearing holder attached to one end of an aluminium plate as follows:
The bearing holder is attached to the plate by two bolts on the bottom. The intended setup is to attach a ...
1
vote
1answer
31 views
Assess bearing force ratings [closed]
Suppose that a ball bearing has axial and radial force ratings of 300N. If the bearing is to hold a 1m long shaft in its bore with a 1kg load on the end of the shaft, will the ratings be exceeded? The ...
2
votes
1answer
68 views
Strength of bolts
I was wondering if it'd be a good idea to attach a 10kg load to the end of a movable steel rod by fastening it with just one M5 bolt. Looking at Misumi's datasheet, M5 (Class 10.9) has an allowable ...
1
vote
1answer
39 views
Hook's law - beginner's question
Under Hooke's law, we know that sigma stresses are responsible for volumetric strain, while shear stresses are responsible for the formation of form strains. In a lecture at my university it was shown ...
2
votes
0answers
33 views
Is having a keyway in aluminium for 30Nm a bad idea?
I'm designing an aluminium shaft hub for a 16mm keyed shaft with a maximum torque of 30Nm. However, stress analysis tells me that the keyway can suffer too much stress:
If my understanding is correct,...
5
votes
1answer
90 views
Rover Wheels: Convex or Flat?
I was comparing the wheels of the Curiosity rover and the Perseverance rover and noticed that the latter had a very flat cylindrical design as compared to the former.
This got me thinking about which ...
1
vote
0answers
35 views
Shear and normal stress in rivets
Hello everyone :) This is my first post here so please excuse any of my mistakes.
I’m having some difficulty with solving the following problem. Let us have a thin-walled square pipe exposed to ...
0
votes
1answer
42 views
Analytical solution of thermal stress in a bi-metallic cylinder
As a side project I have looked to solve using Python an analytical solution for one-dimensional transient heat transfer in a thick cylinder with cladding on the inside surface, wherein the fluid in ...
-1
votes
1answer
37 views
Stress Analysis University Report Help
I'm working on a final report for the mechanics of material course, and the project was to choose a structure or mechanical element and carry out stress analysis using solidworks and then confirm ...
2
votes
1answer
53 views
Bending behavior of built-up C-Channel
I am analyzing a built-up C-channel for bending purposes (2 point loads of 1200 N each @ 30 cm symmetrically from the CL). The flanges are made of a different material than the web, they are also of a ...
-1
votes
1answer
25 views
Deformation and stress in moment of hit (Ansys)
This how task goes: i need to find deformation and stress of piston in moment of hit between piston and tool (tool is stationary). Velocity of a piston is (5-7 m/s) and forces are in picture below.
I ...
1
vote
0answers
24 views
WEC linear inputs
I have seen some designs being made for linear generators for WEC(wave energy) applications. A buoy driving a shaft. But what if the shaft inside was a rack and pinion? If you converted the ...
1
vote
2answers
32 views
Stress Concentration Factor
Looking through texts such as Shigley's Mechanical Engineering Design, you come across tables of the stress concentration factor (defined as $K=\sigma_{max}/\sigma_{avg}$) such as the following:
This ...
2
votes
1answer
42 views
Calculate whether a polycarbonate plate can withstand a certain force
I need to calculate whether a polycarbonate sheet can withstand a certain maximum force. The force is an impact force on any one point of the sheet at any given time. All I have are the Young's ...
1
vote
1answer
51 views
Why does fatigue crack growth require unloading?
When a crack has been initiated in a material, further loading of the material causes stress concentrations at the crack tip. This high stress causes the material to break at the tip and the crack ...
-1
votes
2answers
56 views
Bending moment in Euler-Bernoulli finite Element
I'm trying to calculate the bending moment distribution on a fixed-fixed Euler-Bernoulli beam. It is known that interelement nodes show different values for the bending moment. What is customary to do ...
2
votes
0answers
37 views
Unexpected stress concentration results
I've run some stress simulations but I keep getting some unexpected results. I have 3 parts connected using 4 bolts as follows:
A torque of 1N is applied to the hole on the right to simulate a hung ...
2
votes
0answers
87 views
Why do we use the strain-controlled test for the compressive strength of concrete?
As you all now, a typical stress-strain curve for concrete under compression can be seen in any reinforced concrete design textbook. The decreasing part of the curve (post-peak) can be obtained by ...
3
votes
2answers
48 views
Is it feasible to mount a 40kg shelf on a rotating and sliding pole?
I want to build a shelf that can I can place near a wall and still be able to rotate it around 180 degrees. I therefore would want to mount the shelf on a rotating pole and to reduce the needed ...
1
vote
1answer
31 views
Physical Significance of Max Shear Stress in a Rod in Compression
For a rod in compression, the max shear stress at a point is $\pm\sigma_x/2$, i.e. half the compressive stress applied at either end.
This value is obtained using the equation for $\sigma_\theta$, ...
2
votes
0answers
152 views
Double Shear Stress butt joint
A double shear butt joint is shown below in the diagram 4 plates are held together by two bolts. The applied force is 42KN. Determine the shear stress within the joint
$$\begin{align}
a &= 2 \...
1
vote
1answer
222 views
Determine Bolt dia from Shear stress and force
The Diagram below shows a lap joint where two plates are held together by a bolt. The applied force (F) is $42~\text{kN}$ and the shear stress is $593~\frac{\text{N}}{\text{m}^2}$ Assuming that the ...
2
votes
1answer
63 views
Twist “buckling” critical load
I have a very long beam which is subjected to a torque (I have the moments and shear forces with respect to X along the beam). I can calculate the critical load when the beam would bend if it was ...
0
votes
2answers
91 views
Maximum stress point
I want to determine the point where the maximum stress is located. Also, I want to know how this kind of questions is answered.
2
votes
2answers
87 views
How do I determine what hardness to change the bearing or the track?
We have a project that requires us to use a qty of 4, Ø2" yoke roller bearings mounted two per side on a trolley that roll on a steel track. The maximum total weight that we estimate on the track at ...
1
vote
0answers
36 views
Understanding compatibility of strains
In mechanics, we have the so called compatibility conditions, which quarantee that when a body deforms, the strains are "compatible" in such a way to no discontinuities or gaps for inside the body as ...
0
votes
1answer
76 views
Calculating the Thickness of a Glass Tube which contains a Vacuum
I am looking for borosilicate glass tubes which can be used to contain a vacuum, so the top is sealed and then there is a vacuum pump at the bottom where the edges are also sealed, effectively making ...
2
votes
1answer
296 views
Does the volume change under the tensile or compressive stress?
This confusion arise because my teacher says that volume does not change under tensile/compressive stress within the elastic limit of the material ( consider metal here). But as far as I can see via ...
0
votes
2answers
81 views
Why does stress act a point instead of on an entire area normal to the stress?
I've often heard stress acts at a point and not on an entire cross-sectional area to which the load is applied normally.
Im a little confused here, Let us consider an area of cross-section ...
1
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0answers
30 views
What is the difference between $K$ ,$K_{IC}$ and $K_t$?
I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
0
votes
1answer
46 views
Calculating Forces using equations of equilibrium
The homogeneous bar shown in Fig. P-106 is supported by a smooth pin at C and a cable that runs from A to B around the smooth peg at D. Find the stress in the cable if its diameter is 0.6 inch and the ...
0
votes
1answer
110 views
Looking to design a cantilever support to hold up an 80kg projector
I need to make a support (preferably metal) for a projector to be fixed on the wall. The projector size is:
Width: 0.7m
Length: 1.1m
Weight: 80kg
If anyone knows how i can solve this please let me ...
-1
votes
2answers
57 views
What does stress analysis of 3D printed parts reveal vs their normal counterparts?
I have seen videos or heard about 3D printed buildings, 3D printed space shuttle parts and more. There seems to be a lot of craze developing around 3D printed manufacturing.
I have never heard anyone ...
1
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0answers
377 views
Why is pure shear a “shear”?
If one looks up the meaning of shear strain, most sources talk about this situation:
That is, a force acts along a surface of an element at it is elongated, turning a rectangle into a rhombus. ...
1
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1answer
63 views
How is the stress concentration factor calculated in FEM?
I have written my own finite element code for a linear elastic (plane stress) problem consisting of a plate with a circular hole in the middle, fixed on one side, having a tensile force acting on the ...
2
votes
0answers
71 views
Shouldn't brittle materials be the ones failing under shear deformations?
It is known that brittle materials tend to fail under normal stresses, that is, tensile or compressive stresses. Brittle materials often are bound together into crystals by ionic bonds between atoms, ...
2
votes
1answer
79 views
Why is deviatoric stress the one causing distortions?
I'm reading this text on stress.
It is mentioned that the Cauchy stress tensor can be split into a sum of two other tensors: hydrostatic pressure $\pi$ and deviatoric stress. Hydrostatic pressure is ...
