8
votes
Accepted
Material selection for weight scale
Which of the following materials will be most suitable to manufacture the disc for the stiffest/strongest possible part.
It seems that you need a material that will transform a non-uniform load into ...
- 3,587
7
votes
Accepted
Why is tensorial shear strain half of engineering shear strain?
A tensor is a mathematical object which has to obey certain rules about how to transform it from one coordinate system to another.
Engineers started using and measuring strains a century or more ...
- 12.5k
6
votes
Difference between 'plastic yielding' , 'plastic yield strength', plastic strength' and 'plastic stress'?
All these terms refer to the effect of loading on the deformation of materials. Let us assume that we start with zero load and zero deformation.
Elastic deformation
If you increase the load you ...
- 1,428
5
votes
what is issue with my room brick wall? How can i solve it?
The wall is experiencing rising damp.
Basically, moisture in the soil is being absorbed by the wall and traveling up the wall. This can become more prevalent during wet periods and subside during dry ...
- 9,527
5
votes
Accepted
Springback after a plastic deformation
When the load is removed, the elastic strain is recovered completely (by definition); the plastic strain is not recovered at all (by definition):
If the load is reapplied, the curve picks up where it ...
- 1,204
5
votes
Accepted
Deflection of constrained rectangular plate
deflection of a constrained rectangular plate
By this I assume you mean that all edges are fixed.
My general go-to for these types of formulations is Roark's Formulas for Stress and Strain, 7th ...
- 3,587
3
votes
Solid mechanics: Deflection of a rectangular elastic membrane
This answer expands upon the approach suggested by @setun-90 and shows that the algebra gets quite complicated. I'd suggest a Green's function approach instead.
Assumptions
isotropic
deflection of ...
- 1,428
3
votes
Behavior of materials on application of tension
Yes.
In a perfectly elastoplastic material (where the stress-strain relationship is perfectly linear until the yield point and is then constant and equal to the yield point), the material will ...
- 13k
3
votes
Accepted
Wheel rolling resistance
Before we dig into practical equations, I'll just say that tires are surprisingly complex in their behavior. There are a variety of equations that try to fit the experimental data reasonably well. ...
- 1,976
2
votes
Is there an standard description for deformation at each point on a body?
Displacement field - a vector field, that assigns a displacement vector to each infinitesimal particle of the body over time.
The object, in this case will be usually defined by a density field (...
- 6,133
2
votes
Possibility of buckling in non-slender member?
It is not necessarily a typo, but you wouldn't normally call a thin walled cylinder 8mm high and 100mm diameter a "pipe".
However, the formulas for Euler buckling are most definitely not valid for a ...
- 12.5k
2
votes
Computing strain in beams
I will try to explain the solution:
QUESTIONS: 1. Why is the elongation distribution in the length of the beam a triangle?
The "real-life" visualization of the displacement of the system is ...
- 860
2
votes
Beam deformation under trapezoidal load
(edit 3/31/2018. Completed all equations)
I would split the trapezoidal load
into the sum of a uniform load
and triangular load
.
The reactions $R_1$, $R_5$, $R_4$, and $R_8$ can be calculated ...
- 501
2
votes
Deflection of a stack of disks under applied force/pressure
Between disc 1 & 2, there is a reaction force on disc 1 which is not going to act on the edge rather at the distance of 2nd disc edges.
This means you need to have the model of 1st disc bending ...
- 21
2
votes
Accepted
Why torsional warping does not occur for shafts with circular symmetry?
Let's imagine a solid cylinder attached to a fix support at one end and free at other. We twist it at the other end by a torque.
It will rotate about it's axis without warping, ( small angles ...
- 21k
2
votes
Why torsional warping does not occur for shafts with circular symmetry?
The reason is symmetry.
For a circular rod under torsion, if you rotate the rod through any angle the warped shape has to look the same, because there is no "special" point around the circumference ...
- 12.5k
2
votes
How to measure the stiffness of a rectangular beam, and compare it to a triangular beam?
For members of same material and same length, the one with larger moment of inertia is stiffer. If material is same, but their lengths differ, compare (I1/L1) and (I2/L2), the larger one is more stiff....
- 7,623
2
votes
Will A Material Plastically Deform If you Slowly Apply a Strain That Would Normally Exceed Its Ultimate Tensile Strength
I think its the other way around. I.e. the tensile testing takes place in an quasi static (relatively slow rate). This means that you shouldn't expect (usually) larger strains to failure.
However, ...
- 22.7k
2
votes
Will A Material Plastically Deform If you Slowly Apply a Strain That Would Normally Exceed Its Ultimate Tensile Strength
This is not the answer but to remind you that you need to identify the material of concern (as not all materials have the same failure mode), and the UTS on the curve (whether it is the engineering ...
- 7,623
1
vote
How to measure the stiffness of a rectangular beam, and compare it to a triangular beam?
There is an easy way you can calculate a god approximation to the bending strength of the guitar handle.
You can assume you guitar handle cross-section as a trapezoid and measure the moment of inertia,...
- 21k
1
vote
How to measure the stiffness of a rectangular beam, and compare it to a triangular beam?
deflection of a beam
Depending if the beam is cantilever, simply supporter or else you have different formulas.
For the simple case of a cantilever beam, with a concentrated load at the end the ...
- 22.7k
1
vote
deformable object squeezing
It's straightforward to model very slight deformation of the sphere (i.e., slightly flattening its surface). It's also pretty straightforward to model the case when the sides are already fully ...
- 1,204
1
vote
Accepted
Understanding plastic deformation
In a mechanical engineering curriculum at university, you would probably take a series of 3 classes. First would be called "Strengths of Materials" (or maybe "mechanics of materials"). This would be ...
- 2,511
1
vote
Deflection of a stack of disks under applied force/pressure
The Radius of curvature on a beam bent under moment is $1/r = m/EI $
If we use this just as a rough model the m affecting each disk gradually becomes smaller as we go up and radius of curvature ...
- 21k
1
vote
Springback after a plastic deformation
In ductile materials there is a well defined straight area at the beginning of the stress/strain curve which is purely elastic, the slope of this part of the curve is Young's modulus. If you remove ...
- 21k
1
vote
Springback after a plastic deformation
If you want to bend a piece of metal to a particular angle then you have to bend it slightly more than the angle as when it is released it will spring back a bit.
Try it in a vise and see how it ...
- 14.1k
1
vote
Accepted
deformation / bending problem with anodized aluminium panels
Very difficult to think that anodizing could cause distortion. I think there is a possibility that bead blasting could cause distortion with high pressure and large beads. Bead blasting is similar to ...
- 5,894
1
vote
Increasing the stiffnes of a structure by adding stiffener, but at the same time reducing main surface thickness
Wooden tables have been doing that for a long time using an apron. In fact a steel clad wooden surface may be enough. But if you seal the top with a slab of steel you will also want to seal the ...
- 5,686
1
vote
Computing strain in beams
1: The problem describes the beam as rigid, this means it will not deform and will always remain straight. Therefore when loaded in point C it only rotates about A. This is why you get a triangle when ...
- 19
1
vote
Accepted
Finding initial length of a bended plastic sheet (Bend Allowance)
If we can assume that the material behaves in an elastic linear way and that the joint is only loaded by bending, then as you commented the neutral line lies in the middle and that deformation on the ...
- 407
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