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Questions tagged [strength]

This is to be used for topics regarding the strength of materials, the analysis of internal forces in a body and all the governing principles which considers deformation of bodies.

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4 answers
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What is the physical reasoning behind metal becoming stronger and harder if heat treated?

I was wondering that if a proper process of heat treatment (heating to a temperature above upper critical temperature, then soaking and then quenching) is applied to a metal like steel, then what ...
Rameez Ul Haq's user avatar
10 votes
4 answers
28k views

Why does the stress-strain curve decrease?

This is a stress-strain diagram I have noticed that the curve decreases between points C & D and between E & F. Why does that happen? I expected the curve to always increase since the ...
Eman.suradi's user avatar
6 votes
3 answers
11k views

How does the strength of a square tube depend on the side size?

There are two square tubes of the same length, material and wall thickness, one being 40x40mm, the other 20x20mm. How does their strength against bending compare? On the one hand, the cross-sectional ...
Greendrake's user avatar
6 votes
1 answer
32 views

What is strain/loading rate dependence/sensitivity of compressive strength of brittle materials?

What is the definition of strain/loading rate dependence/sensitivity of compressive strength of brittle materials? Is it general strain/loading or it is specific for the brittle materials?
Sina M's user avatar
  • 131
6 votes
2 answers
118 views

Could a vacuum tank ever be light enough to be boyant in air?

Given futuristic materials, could a structure ever be strong enough to contain a vacuum, yet light enough to provide buoyancy under standard atmospheric pressure? Obviously "futuristic materials" is ...
Lorry Laurence mcLarry's user avatar
5 votes
2 answers
9k views

Calculating shaft diameter

I'm designing a circular shaft that's going to carry a spread radial load of about 200kg and also transmit a 160Nm torque. I'm not very familiar with materials but what I'm guessing I'll be able to ...
php_nub_qq's user avatar
5 votes
1 answer
371 views

Can concrete lose strength during curing?

We cast a bridge's concrete deck and kept samples for concrete strength tests at 7 and 28 days. We took a test at 7 days, and the test result were over the design strength (designed for 30 MPa, ...
Murat Dal's user avatar
5 votes
1 answer
121 views

Would a partial space elevator work? [closed]

Background The normal space elevator (that reaches from the Earth's surface to a counterweight beyond geostationary) needs a material that's strength/weight ratio is better than any material we have ...
lionfish's user avatar
4 votes
6 answers
638 views

Increasing torsional-stress resistance of an Auger at its motor-shaft joint

An auger is used to move plastic balls and is rotated by a stepper motor. Due to the balls getting jammed sometimes, this induces stress on the auger at the motor-shaft junction and breaks. Images ...
Amol Patravali's user avatar
4 votes
2 answers
490 views

Beam buckling criterion?

If I have an I beam which I subject to some bending load, how can I calculate when the thinner middle part of the I beam will buckle? I though I could use Euler's critical load formula here, but it's ...
Beacon of Wierd's user avatar
4 votes
2 answers
1k views

How to provide lateral support for adjacent masonry during installation of steel UC in an old cavity wall?

I've got a structural engineer ready to provide calcs on this job, but there is a specific aspect where I'd like a heads-up what the normal approach would be, before I raise it with him, in case he ...
Stilez's user avatar
  • 571
4 votes
2 answers
699 views

How to determine tensile strength while the normalised tensile strength is known?

I try to design a shaft with yet unknown diameter, i know the distribution of forces and stresses (shear, torsion and normal) in/ along the shaft. I need just one more parameter nl. the tensile ...
user avatar
3 votes
1 answer
255 views

What methods are there to test the flexural, tensile and compressive strength of concrete?

The only one I know is the three point bending test for flexural strength.
opaque_dragon's user avatar
3 votes
2 answers
656 views

How to compute core stress in honeycomb structure?

Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below: The problem is how to find the core stresses σ-z (...
Eugene's user avatar
  • 63
3 votes
1 answer
238 views

Distance of Pivot from the Rear axle

I am designing an NSAM crane. I have encountered the following issue when designing the vehicle: Generally the pivot(or the point about which the NSAM crane rotates) is in the center. But from two ...
Ait Peti's user avatar
3 votes
0 answers
711 views

Column Buckling Boundary Conditions -- Welded Tubing Practical Application?

I'm trying to do some calculations for a personal project. I'm trying to understand column strength / buckling. My questions relate to Effective Length Constant, which is based on Boundary ...
zipzit's user avatar
  • 281
2 votes
3 answers
2k views

Brittle = highly stiff but not very strong

I was trying to imagine materials undergoing collisions, and thought about materials that do not deform at all. Naturally this is an idealization that does not exist in reality but, if it did, I ...
user442920's user avatar
2 votes
4 answers
135 views

Which post would be stronger?

Just a quick question for you. Well hopefully. A contractor has installed a retaining wall with colorbond fence on top. In the contract he stipulated that he would use 65mm x 65mm x 1.6mm powder ...
Neil's user avatar
  • 21
2 votes
3 answers
2k views

Springback after a plastic deformation

Before the yield point, the deformation is elastic, and then it is plastic. But what happens to the elastic 'part' of strain after the load is removed? Is it retracted fully or partly, and how does ...
Tsayper's user avatar
  • 123
2 votes
2 answers
986 views

How do I calculate the strength to weight ratio of a material

I want to manufacture something using metal 3d printing. And I'm now choosing the material. Stainless steel is stronger but much heavier than aluminum, so I want to calculate which material can ...
Zyleyus's user avatar
  • 31
2 votes
2 answers
459 views

Strength of Plastic Underwater Domes with various thicknesses

I'm currently researching the strength of domes underwater and I went down the rabithole of material science. The basics of this research (or though experiment) is to bring a dome filled with air to ...
Trashtalk's user avatar
  • 123
2 votes
2 answers
986 views

Fillet weld strength calculation

I have 2 plates that are fillet welded to each other. How can I determinate the max force the weld can take before it cracks? The plates are only welded on one side because the other side is not ...
Mech_Engineer's user avatar
2 votes
1 answer
99 views

"The monofilament wire has a tensile strength of 18 kg" What does this mean?

I am used to strength being measured in units of stress, such as pounds per square inch, or Pascals. I am assuming what the author is trying to say is, "this filament will break when holding 18 kg," ...
Evan's user avatar
  • 131
2 votes
1 answer
50 views

How is the assumption that stress and strain are elastic everywhere is valid for STRESS-LIFE method for fatigue life calculation?

Stress life method is generally employed for high-cycle fatigue (HCF) applications. while HCF region is approximated by $\sigma=a(N)^b$ which gives a linear graph on log-log scale, for steels it ...
huministic's user avatar
2 votes
1 answer
125 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 ...
Kar's user avatar
  • 351
2 votes
1 answer
2k views

Arc welder? Cheap welding device for chainmail/chainmail jewelry

I'm hoping this is the correct StackExchange for this question/request for advice. I'm looking to buy a welder to introduce me a little to welding, my main use-case right now is the hobby projects I ...
Gelunox's user avatar
  • 125
2 votes
1 answer
75 views

Low-tech ways of assessing relative strength of a material (yield point)

I want to compare strength of a metal before and after heat treatment, to assess to effectiveness of that treatment. (See my previous question, Aluminium softened by brazing. How to harden?). ...
Jodes's user avatar
  • 1,304
2 votes
0 answers
34 views

Is inverse hall-petch relation valid crystals larger than nanocrystalline?

The image shown here is of ceramics, where they varied the grain size and measured the strength. For example, let's take Al2O3. There we observed that strength first increased from 3 μm to 95 μm. But ...
Amitabh Roy's user avatar
2 votes
0 answers
24 views

How do I relate Grab Strength and Grab Tear to the real world?

I'm looking at a spec sheet for a high density polyethylene woven fabric and I'm seeing the following parameters on it Tensile Grab Strength: Warp 155 / Weft 170 - tested ASTM D-5034-09 Grab Tear:...
corsiKa's user avatar
  • 121
2 votes
1 answer
172 views

Most efficient fillet design given an envelope (for stress)

If one has a specified allowed X length and Y height, into which a fillet can be placed to reduce stress concentrations, is there an equation which can be used to determine the optimal shape of the ...
user1814893's user avatar
2 votes
2 answers
66 views

How to strengthen existing masonry vaults and domes? [closed]

I would like to know what methods are usually used to strengthen existing masonry vaults and domes, especially the ones called Catalan Vaults, and how to design them. Thank you in advance.
Mohamed's user avatar
  • 317
1 vote
4 answers
103 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 ...
radoslav006's user avatar
1 vote
3 answers
134 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 ...
TheEnvironmentalist's user avatar
1 vote
3 answers
1k views

How to measure the stiffness of a rectangular beam, and compare it to a triangular beam?

I'm an amateur at engineering, working more on musical instruments, and I'm often in confusion regarding what exactly constitutes stiffness of a beam for a load applied on it so it could resist ...
Aecarvalho's user avatar
1 vote
2 answers
3k views

Is strain energy the same as potential energy, or something differen?

Sorry for this stupid, basic question. But I got hung up on it. We know from Clapeyron's theorem that the strain(internal) energy of an elastically deformed body is equal to half the work $$ U=\...
user avatar
1 vote
1 answer
308 views

Definitions of strength?

Can tensile strength be the same as yield strength? Can Flexural Yield Strength be related to the yield strength of a material in any way?
Hypnos Stratagem's user avatar
1 vote
1 answer
119 views

Same E for axial and rotational stiffness?

When we solve frames, we assume that the materials are infinitely rigid in axial direction, so all deformations are due to bending. So this means, we assume infinitely rigid modulus of elasticity, E, ...
upstream's user avatar
  • 462
1 vote
1 answer
830 views

With which parameter can you specify whether a metal is ductile or brittle

I have to do a durability approval of feather key (shaft-hub connection) and the formulas are dependent if the shaft respectively the hub is ductile or brittle. But what is the decision about to say ...
tueftla's user avatar
  • 218
1 vote
1 answer
145 views

Screw Calculations/Math

At the risk of every woodworker in the world snickering at me, I'm curious how strong my wood joints are and want to know how much weight a table supports. I'm an aero engineer who ended up in EE, but ...
bonhoffer's user avatar
  • 155
1 vote
2 answers
627 views

Calculating break point (bend) of a material

I'm trying to compare a really tough polyurethane to baltic birch plywood to see if I can use it instead (a lot of subtractive processes to the plywood, want to eliminate it) So what i'm looking for ...
Simon's user avatar
  • 115
1 vote
3 answers
292 views

Equivalent sheet metal thickness of different alloys

I want to replace steel plates that are being used as trim tabs on a boat with 90-10 cupronickel. The main design parameter is to make sure the plate has no less flex than the part being replaced. In ...
Wallace Park's user avatar
  • 1,635
1 vote
2 answers
101 views

Can strength be expressed in a single value? Can flexibility?

I'm trying to communicate information about the strength and flexibility of certain materials to laymen. Are there any recognised proxies for strength and flexibility? I've tried: $$\text{Strength ...
Andrew's user avatar
  • 11
1 vote
1 answer
101 views

Poisson relationship between area and length of electric wire

I was given the following formula to relate the change of area against the change of length of an electric wire with a Poisson ratio: $ {\Delta A \over A} = -2 \nu {\Delta L \over L} $ where $ \Delta ...
KMC's user avatar
  • 217
1 vote
1 answer
856 views

How to estimate the tensile strength of inch diameter steel round?

The tensile strength for 1045 TGP Precision Steel Round is said to be 91 ksi. Although, different diameters must be a factor, right? Would a 1" diameter rod be 104.5 ksi or 1045 ksi? Say I want ...
adamaero's user avatar
  • 111
1 vote
1 answer
140 views

Boron Carbide Shattering a Bullet

Does anyone know how this works? I hypothesize that the reason that the bullet shatters is that boron carbide is much harder than the copper of the bullet. Does anyone think that this may be made into ...
Hypnos Stratagem's user avatar
1 vote
1 answer
1k views

What causes shear force?

Most of resources I've been reading don't explain the scientific reason for the existence of shear force. Most resources just teaches how to solve problems and about properties. Nothing goes deep (not ...
user2860452's user avatar
1 vote
3 answers
1k 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 ...
kenchan123456's user avatar
1 vote
3 answers
586 views

Design procedure used in beam design

In the design of beams, the principal stresses and absolute maximum shear stresses are not calculated. Instead, we calculate maximum bending stress using flexure formula and equate it to allowable ...
Max's user avatar
  • 88
1 vote
1 answer
80 views

Calculating the diameter of screws that are on radius 160mm from axis of rotation. I need help - I don't know If I'm thinking in the right way

First of all, english is not my first language so if there are some mistakes I made - I'm sorry and I hope everything is understandable. The example I am trying to solve reads the following: The gear ...
Jakub Szurlej's user avatar
1 vote
1 answer
38 views

Strong resin for fibreglass

Is there a binding material that could be reinforced with woven glass fibres cloth for tensile strength, but which offers reasonable containment against high pressure when used minimally? Ie ...
Bohemian's user avatar
  • 111