Questions tagged [stresses]

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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 ...
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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 ...
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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? ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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,...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 $\sigma_\theta$, ...
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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 \...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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, ...
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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 ...