# Questions tagged [stresses]

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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
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### Spinning disc stress distribution

For a thin spinning disc, is the boundary condition on the outer surface that the radial stress is zero? If so, how is this consistent with the fact that the outer surface of the disc has a ...
• 1
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### The hanging of lead weights in the Cavendish experiment of 1798

I'm working to build the Cavendish experiment of 1798 according to Cavendish's own specifications. I have a question about the hanging of the 150 kg lead weights. As seen in the image, there is a ...
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### Should I calculate hook part of hook with metric thread? If so, then how do I do it?

I am making a project for one of the courses I have on my university. I have coaxially loaded hook: Now, I know it will be streched in a segment that is marked with digit 2, Initially I have ...
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### What are the physics behind a TV wall mount?

As I was installing this wall mount, I began to wonder how exactly physics is at work with it. In other words, how does the design of the mount play a role in ensuring that the mount itself supports ...
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1 vote
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### How to minimize perpendicular strain on cam-follower system?

I have a cam+follower system as shown in the picture: As the arched cam moves in the horizontal direction, the (fixed) follower gets pushed in the vertical direction. But as the cam approaches the ...
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### Shear Strain and no change in volume of the element

Consider that at a particular point of the body the state of stress was that of a pure shear one, with $\tau_{xy}$ and $\gamma_{xy}$ as the shear stress and strain. I read two statements in two ...
49 views

### What would happen if we applied a stress greater than the yield stress to a rigid-perfectly plastic material?

Say we had a material that was rigid perfectly plastic, with a stress-strain characteristic as shown: Say that we are drawing this material through two dies, something like this: What would happen ...
• 117
1 vote
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### 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 ...
95 views

### What is the significance of brittle materials and why do we use them?

What is the significance of brittle materials and why do we use them? As you can see in the stress-strain curve, brittle materials have extremely low plasticity, in which cracks can initiate without ...
1 vote
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### How to use Mohr's circle to find stresses on a slanted plane?

Here is my attempt to the problem: Does this make sense? rotation clockwise 60* from horizontal to normal of the slanted plane , therefore $2 \times 60$ clockwise as well on Mohr's circle. I am ...
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### Principal Planes and Principal Stresses

Consider that a state of plane stress exists at a point and the stresses acting on an element taken at that point are given as, The normal stress acting at any plane of this element inclined at an ...
1 vote
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### What does negative shear stress mean $\tau \:=\:\frac{VQ}{It\:}$?

$\tau \:=\:\frac{VQ}{It\:}$ My confusion lies within $Q$ term. $Q = yA$ where $A$ is the cross-sectional area of the segment that is connected to the beam at the juncture where the shear flow is ...
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### Find hotspots in a system

In the image, I have a depicted a system which is undergoing fatigue. Using appropriate solver I have determined the life of each nodes and it is stored in a .csv file. Also I have the connectivity of ...
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### Calculating member stress in a truss

I have the following question: Here is my attempt: Is this correct ?
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### FEM boundary problem in structural mechanics

I have spent way too much time in the last weeks/months implementing and writing my own finite element solver from scratch. I successfully implemented 2D and 3D elements and wanted to verify a few of ...
• 117
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### Why von-mises criteria considers the second invariant of deviatoric stress? [closed]

Why only the second invariant is considered? What about the third invariant?
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### Bearing stress in Bolts

Consider the arrangement shown below. It consists of a bolt, clevis and plate. Since, the clevis and the plate press against the bolt, the bolt will be acted upon by forces 1,2,3 (as shown). There is ...
87 views

### When we replace supports distributed reaction by point reaction in thin beams, is that considered an application of Saint-Venant principle?

I read about Saint-Venant principle which is about the effect of replacing forces by equivalent forces system that effect on the same small region of a rigid body, all examples I come across are on ...
461 views

### Does welding two metal parts together increases or decreases the strength locally there?

I have a structure made out of steel consisting of many thin rods and some of them are welded to each other. I conducted a simple FEA static structural analysis to determine if the structure would ...
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### How do you estimate the energy of an impact?

I am trying to determine the energy of elastic stress waves generated in a solid by an impact. I have a time domain waveform from a piezoelectric transducer that was placed next to the impact site, as ...
75 views

### I can't decipher the string printed on my steel pipe (to find the yield stress)

TLDR; Can you please help me understanding the string in the picture and help me finding the yield stress that my metal can handle? Full story I am trying to estimate how much load some zinc-coated ...
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### What happens to the maximum force in bar under bending when its cross sectional area is decreased?

Consider a rectangular cross sectional beam for instance with dimensions a = 1 mm and b = 1 mm, fixed at one end and transverse force at the other. I will get the maximum stress at the farthest away ...
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