Questions tagged [stresses]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
2answers
60 views

Stress-strain Curve Interpretation

A significant barrier to my understanding of typical engineering stress vs. engineering strain curves is that for certain values of stress, there are multiple values of strain (i.e., the stress-strain ...
0
votes
1answer
64 views

Slope of the Bending moment diagram where a point force acts

Consider a beam that is arbitrarily loaded and at any distance x, we take an element in the beam between two sections, where a point force acts as shown. Let us assume the directions of shear force ...
0
votes
2answers
44 views

Relationship between shear force and load intensity

The book I'm referring to for studying beams, said that its quite cumbersome to construct shear force and bending moment diagrams, by writing the SF and BM equations for each segment of the beam and ...
0
votes
1answer
18 views

Why does Poisson's ratio always have the axial strain as the denominator?

Why can't we divide the lateral by the axial strain? Why does the axial strain always have to be the denominator? Would it matter if I was careless and accidently switched them around?
0
votes
2answers
32 views

Shear force in a beam at ends

Consider a cantilever beam acted upon by a point load at its free end. The shear force diagram is shown. I have a little doubt,is the shear force at x= 0 ,both 0 and $-W$ or just $-W$? Similarly at ...
22
votes
5answers
4k views

How do ball bearings not crack from a load concentrated on an infinitesimally small point?

How do ball bearings last? Most bearings in a standard hub (bottom of the image) are not actually taking a load. Only the single ball that happens to be at a particular location while spinning takes ...
0
votes
0answers
28 views

How they derive The Green strain tensor?

in this paper they give the deformation tensor and the green lagrange tensor without explanation i have some difficulties with tensor calculus ,Especially dyadic product can some one explain it in ...
0
votes
4answers
76 views

What is meant by Direct and indirect stress?

The book that I'm referring to for studying Strength of Materials states that: "The loading case discussed here is an example of simple or direct shear, since the shear is caused by the direct ...
2
votes
1answer
38 views

A close coiled helical spring with torque acting about longitudinal axis

Consider a close coiled helical spring which is acted upon by a torque about its longitudinal axis as shown. I'm interested in knowing the effect of this torque on the spring wire. Here's my take: I ...
0
votes
2answers
44 views

Deformation of a plane in Torsion of a Circular Shaft

Consider a shaft which is fixed at one of the ends and is acted upon by a torque at the free end as shown. We take a plane inside the shaft as shown in the figure before the torque is applied. I'm ...
1
vote
2answers
53 views

A question on thermal stresses

I'm studying strength of materials at undergrad level and was taking a test in the same. One of the questions from the test goes like this In my understanding since the coefficient of thermal ...
1
vote
3answers
40 views

Failure load of hollow tube under transverse compression

How would one analytically calculate the maximum force a tube under transverse compression can withstand? I am specifically looking for a general equation to model the yield strength of a hollow tube ...
1
vote
1answer
79 views

Maximum shear in a beam

Engineering books and lectures typically make two things clear: Maximum bending stresses (normal) develop at the beam surfaces, that is, at the greatest distance from the neutral axis. Shear stresses ...
0
votes
3answers
76 views

Beam with width tending to zero

Suppose a cantilever beam (of rectangular cross-section) subjected to vertical transverse shear load at free end. If I consider any arbitrary cross-section then both bending and shear stress will be ...
0
votes
2answers
61 views

Do we have infinite number of stresses at a point in a prismatic bar loaded in tenison?

Consider a prismatic bar loaded in tension as shown. I consider a point Q in the bar away from the ends. This point Q can be considered as an infinitesimally small element taken within the body. We ...
0
votes
0answers
29 views

where did the concrete splitting test calculated stress formulat come from?

In compression test of cylindrical concrete sample we get the normal stress easily by dividing failure force by sample cross section, but how we can explain the formulat used to determine tensile ...
0
votes
1answer
25 views

Does F_x generates "Transverse Shear Stress" shear stress at the fixed end A?

Considering the applied forces $F_y=F_y=0$ and $F_x=400$ lbf, what type of stresses does $F_x$ produce? I understand that $F_x$ causes tensile and bending stress but not sure about the transverse ...
0
votes
4answers
81 views

Bar fixed at one end at heated

Consider a bar which is fixed at one of the ends. I increase the temperature of the bar by $\Delta T$. The sources I'm referring to say that stress developed in the bar will be zero because the bar is ...
0
votes
2answers
44 views

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 ...
0
votes
1answer
30 views

Calculating member stress in a truss

I have the following question: Here is my attempt: Is this correct ?
0
votes
2answers
60 views

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 ...
0
votes
1answer
33 views

Why von-mises criteria considers the second invariant of deviatoric stress? [closed]

Why only the second invariant is considered? What about the third invariant?
0
votes
1answer
50 views

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 ...
0
votes
4answers
80 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 ...
2
votes
2answers
426 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 ...
2
votes
0answers
37 views

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 ...
0
votes
2answers
71 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 ...
2
votes
2answers
62 views

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 ...
0
votes
3answers
44 views

Find the maximum stress at a point in a machine member

A machine member having a diameter of 50 mm and a length of 250 mm is supported at one end as a cantilever subjected to different forces as shown in the figure. Find the maximum stress at points A and ...
1
vote
4answers
96 views

Mechanics: example of less mass/volume gives more strength

Lets assume we have a mechanical element from uniform material that is supposed to work in a static load conditions. Moreover lets assume there is no gravity or gravity is negligible. Are there any ...
0
votes
1answer
108 views

How do I calculate the strength of a carbon fiber tube?

I am not a mech engineer and have been struggling with this for a while, I feel like it is pretty straight forward but I'm missing something. The problem is a horizontal tube that is supported at one ...
0
votes
1answer
17 views

trying to find maximum torsional stress

I was wondering how I could get Ttmax (maximum torsional stress) or rather what the formula for it could be
0
votes
2answers
27 views

Stresses due to combined loadings in a bent shaft supported at both ends

I was hoping someone might be able to help clarify where I might be going wrong with this question. I am being asked to essentially determine the maximum normal and shear stresses at the rigid support ...
0
votes
3answers
90 views

Why is my FEM analysis producing unusually-large stress results?

This is my first time performing an FEM analysis, and I'm using the Ansys Workbench and Mechanical software. My situation is pretty straightforward--it's a straight beam that is fixed at one end and ...
3
votes
2answers
260 views

Is there any difference between an-elastic and visco-elastic materials?

Most of the sources that I had read about either talks about anelasticity or viscoelasticity, they don't compare both. From what I have read so far ,both anelastic and viscoelastic materials are the ...
2
votes
3answers
472 views

Does perfectly elastic and perfectly plastic material make any sense?

I have been reading about the elasticity of materials and most often in engineering there is always some ideal concepts which are the extreme cases. So is there any particular definition to what is a ...
0
votes
4answers
83 views

Do windows add to strength or rigidity?

A friend who repairs washing machines told me that the window adds rigidity to the front cover and compresses the gasket. Also the windows of cars act against shear forces, he said. Do you know ...
0
votes
5answers
119 views

Why ships have extremely thin plates?

The thickest plate of the famous Ever Given as an example with its 400 meters length is 30mm thick. And a good part of its skin is even thinner. If we compare with a car 2 meters long it is amazingly ...
1
vote
3answers
51 views

Elongation due to tensile forces on a cylindrical object

I have been presented with the following problem. I think that I'm okay with calculating the stress and strain, but am unsure on how to tackle the elongation. I think we would need to assume that the ...
1
vote
1answer
28 views

a model of a solid using trusses to approximate internal stresses?

my question is as follows: could the stresses on a solid body be aproximated with a discrete model based on trusses?, this is, that the result yielded by the analysis of the truss structure will ...
1
vote
3answers
74 views

How can I visualize shear stress concentration?

I have seen plenty of diagrams showing parallel axial stress lines to aid in understanding the stress concentration around corners and other things. But this doesn't seem to be a good visualization ...
0
votes
0answers
29 views

Computing forces and moments acting on the sides of a rectangular shell element from corner forces and moments

I have a FEM program for shell elements implemented through the direct stiffness method. Using this program corner displacements of shell elements due to external loading are obtained through the ...
3
votes
2answers
142 views

How exactly do forces transfer in different directions?

If we imagine the load being placed at the top of the below triangle, I realise that the downwards force is transferred into one which goes in a 'south east' and 'south west' direction down to the end ...
2
votes
1answer
60 views

Why do we not want our stress state to be like this?

In this article they mention that Cauchy stress is defined by studying the forces acting on the deformed body, and these forces are constant in space. But if a body is subjected to pure rotation, the ...
0
votes
2answers
103 views

Can a beam be too short to experience bending stress?

The question in the title says it all. I've got a a configuration where I'm using a bolt to support a load. The way its set up, the bolt will have a very short cantilever on it. When I calculate the ...
1
vote
3answers
96 views

Can we say that stress strain curve for a tensile test is function of strain rate and temperature?

I am currently studying about tensile test where it is saying that it is conducted at a constant strain rate. Also, it is said that it is conducted at a particular temperature. So can we say that ...
23
votes
5answers
5k views

Why exactly does a washer help distribute the stress around a bolt?

Usually the reason for having a washer under a bolt head is stated to be that it helps to evenly distribute the stress to the clamped material surface. But why is this? I would understand if the ...
0
votes
1answer
42 views

Applying forces from the inside of a bar

I was reading Schaum's Outline: Strength of Materials (fifth edition) when I came across this solved example problem from the Tension and Compression chapter: The solution was clear to me, however ...
0
votes
0answers
23 views

Adding tension to a model of a Timoshenko beam?

I am interested in modeling a Timoshenko beam: https://en.wikipedia.org/wiki/Timoshenko%E2%80%93Ehrenfest_beam_theory However, I would also like to add tension to the beam so that it can vibrate like ...
0
votes
2answers
62 views

Computing the stress field of a structure made of 4-nodes shell elements (accounting for membrane action, bending and shear)

I am trying to implement my own FE code for shell structures. Most literature provide formulations and strategies on how to compute shell element stiffness matrix. I can already compute deformations ...

1
2 3 4 5 6