What is Strength: Definition and 1000 Discussions

Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to Tensile strength which withstands loads tending to elongate. In other words, compressive strength resists being pushed together, whereas tensile strength resists tension (being pulled apart). In the study of strength of materials, tensile strength, compressive strength, and shear strength can be analyzed independently.
Some materials fracture at their compressive strength limit; others deform irreversibly, so a given amount of deformation may be considered as the limit for compressive load. Compressive strength is a key value for design of structures.
Compressive strength is often measured on a universal testing machine. Measurements of compressive strength are affected by the specific test method and conditions of measurement. Compressive strengths are usually reported in relationship to a specific technical standard.

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  1. Yokoko

    Chemistry Predicting the dependence of Solubility on Ionic Strength

  2. FEAnalyst

    Capped pressure vessel - strength and stability

    Hi, in mechanics of materials books one may easily find fomulas for stress and strain in thin- and thick-walled cylindrical pressure vessels subjected to internal pressure. However, it is assumed that they are open. So what are the formulas for stress and strain in capped vessels (with flat or...
  3. person123

    Why are two pieces of wood stronger when bound together?

    The answer learned in class is that the two 2*4s are able to distribute the load over both of them, but I don't think this is an actual answer because that's balanced by the fact that each block is half the area. Does anyone know of the reason for this observation? Thanks!
  4. person123

    I Maximum Strain For Samples of Different Cross-Sectional Areas

    I would assume that because the samples are made of the same material they would fail at the same stress and so the same strain. However, the data shows that the sample with a greater cross-sectional area fails at a greater strain, and the two are roughly proportional. Does anyone know what...
  5. AN630078

    Gravitational Field Strength at the equator and poles

    1. The centripetal force is equal to F= mv^2/r. The velocity of the Earth can be found by: V=2πr/T T=1 day = 24 hr*60min*60sec=86400 s v=2π*6.4 x 10^6/86400 s v=465.4211 ... ~465 ms^-1 to 3.s.f Therefore, F=1*465/6.4 x 10^6 F=98/1280000=7.265626 *10^-5 ~7.3 *10^-5 N Would this be correct since...
  6. person123

    I Size Effect on Structural Strength

    I'm using the wikipedia page on Size Effect to get an understanding of it. It identifies Statistical and Energetic size effects and two types within energetic. I believe I understand statistical, as it seems to essentially say that assuming there's some variation in the material strength, the...
  7. T

    Can I use a different grade of aluminium for my microlight wing spar?

    I'm considering building a microlight aircraft from a set of plans. According to the plans the wing spar required is a 6m long rectangular box section 100mm x 50mm with wall thickness of 2mm, it is made of aluminium grade 6060 T5. I'm struggling to source a suitable piece of aluminium so was...
  8. LCSphysicist

    What is the gravitational strength "G"?

    I am doing a book that have only exercises, and an introduction to the posterior theme, so, in the introduction, there is the relevant equations, and there is a equation: G = -Gm/r^3 called strength G, in the gravitational topic, what is this? I never saw it.
  9. A

    What is the strength of this scrap yard electromagnet?

    I have a dc magnet which use in scrap yard and the only perameter I know is ,it consume 50 to 70 amps and it area , 440 ac input supply .now I want to know how iron scrap it can lift?
  10. J

    Maximum mechanical actuator strength allowed by physics

    What is the strongest actuator (that can exert a controlled amount of force & be able to start/stop linearly or rotationally) that an infinitely advanced civilization could create, and how (what object/process) would they do it? It must be non-lethal or be shielded to be non-lethal at a distance...
  11. I

    Optimizing Insulator Spacing for High Strength Busbar Systems

    Well, I have one nice problem. I have 30x10mm busbar, and Isc=30kA. I must place this busbars in electrical panel, but I have a problem with insulators. Can I use a red insolators as it's showed on picture, or I should use special holders for busbar system. Another problem is: When I use such...
  12. E

    Shear and Tensile Strength of Bones

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  13. P

    Can I Build My Own Tree Limbing Boom System?

    Hi all, I was hoping a guy with limited engineering skills might find a little help and understanding... I'm not formally trained but am somewhat mechanically inclined. I build things, and usually have good luck estimating strengths and designing things without doing the math or science behind...
  14. T

    Struggling to understand stretch and strength in fishing line

    I'm an angler and having extensive discussions on a fishing forum about the properties of monofilament fishing line. There are two forms: various nylons - mainly we think PA6 and PA66 - and fluorocarbon. Our experience and 'garage testing' of these lines tell us that fluorocarbon while it can...
  15. E

    B Change in field strength if two variables are incremented at the same time

    Given the example g = \frac{GM}{R^{2}}, we may compute the change in field strength if the mass is changed by a small amount dM to be$$dg = \frac{G dM}{R^{2}}$$and also if R is changed by dR,$$dg = \frac{-2 GM dR}{R^{3}}$$If, however, both the mass and radius are changed by a small amount at the...
  16. V

    Shear strength of a cut I-beam

    Hello, I'm in the process of building a 2 story townhome project and had a question on a beam. The structural engineer is calling for a cut I-beam on top foundation which spans over the garage (10') and the load will be placed on just the top flange (see attached). The structure will cantilever...
  17. CPW

    Possible to calculate the strength of a nuclear explosion from a photo?

    Details of this calculation from the photo?
  18. D

    Engineering Determine a suitable cross sectional area for strength

    Lenght=300mm, Force at the end of the handlebar is 200N What i would like to know is: does that 20x20mm end piece affect the calculation process in any way? and whether there are more than 3 types of stresses in this case. First stress being moment created by the 200N and second stress is shear...
  19. B

    Weird question, with strength of materials (probably)

    Hi, So,I'm helping a guy with his mechanical engineering homework. The problem is that the guy is so off, he doesn't even know the name of the subject. And honestly, I having a hard question finding out what this question is about. I need to proove the Zb=h^2/3 thingy. I have no idea what this...
  20. P

    Measuring Magnetic Field Strength of a Cylindrical Magnet

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  21. Another

    What does material non-random strength (f_t) mean?

    https://en.wikipedia.org/wiki/Size_effect_on_structural_strength#cite_note-1 I don't understand about non-random strength (f_t) and size effect of material And please explain to me for the size effect? :cry::cry::cry::cry::cry:
  22. Z

    How to calculate the stability and strength of a simple chassis?

    Dear community, I am an electrical engineer trying to make my hobby four seater car. Being not a mechanical guy I am really uncertain of the chassis design that I have concepted though with the help of a friend we got some basic simulation running. My concept is to use a standard rectangular...
  23. R

    Derivation of ideal magnetic dipole field strength

    For reference, this is from Griffiths, introduction to quantum mechanics electrodynamics, p253-255 When deriving the ideal magnetic dipole field strength, if we put the moment m at origin and make it parallel to the z-axis, the book went from the vector potential A $$ A=...
  24. CynicusRex

    Appropriate tightness of bolts between skateboard and trucks

    As you can see in the pictures below the trucks are attached to the skateboard with four screws nuts and bolts, with a 2~3mm piece of rubber between the truck and the board. I've always wondered if tightening the screws bolts harder, decreases or increases the strength of the 7-layered plywood...
  25. weezy

    Measuring Tensile Strength in an alternative way

    So I've been looking at a few material tests and they all start with a rectangular sample of the material, loaded into a machine which extends them by increasing load at a constant rate and measures the strain/stress till the point of material fracture. The yield stress is measured in usually...
  26. J

    Impulse divided by area equals granule strength?

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  27. M

    Titanium Nickel Alloy: Strength & Durability

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  28. kardai

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  29. T

    How to calculate flexural yield strength?

    I'm trying to learn some new engineering, so if something I ask doesn't make sense -- remember I'm new to this. I need to calculate how much force a part can take before breaking. Material: resin (Flexural Yield Strength: 6752 psi) - (Tensile Strength: 3390 psi) - (Density [lbs/gal]: 9.64) -...
  30. G

    A How to prove this property of the Dual Strength Field Tensor?

    Hi, I've found this property of Strenght Field Tensors: $$F_{\mu}^{\nu}\tilde{F}_{\nu}^{\lambda}=-\frac{1}{4}\delta_{\mu}^{\lambda}F^{\alpha\beta}\tilde{F}_{\alpha\beta}$$ Where $$\tilde{F}_{\mu\nu}=\frac{1}{2}\varepsilon_{\mu\nu\alpha\beta}F^{\alpha\beta}, \qquad \varepsilon_{0123}=1$$ I've...
  31. A

    Maximizing Strength: Choosing the Right Aluminum Tube Diameter for Marquee Poles

    I'm planning on making marquee poles out of aluminium tube. I did so last year and they worked well, but they flexed slightly under tension. To correct this flex, I want to use slightly different size of aluminum tube. I used 4" tube, with a ¼" wall, at a length of 30'. Will the tube be...
  32. K

    Strength of magnetic field at the end of a wire wrapped nail.

    V=I*R 6v=I*(0.6+0.9)ohms I=4amp B=100*(uo)(2N)(I)/L * 1/2 I think since the wire is double wrapped, we multiply the equation by 2, but since we are looking for the magnetic field at the end of the wire we also have to multiply the equation by 1/2 I=4A, uo= 4pi*10^-7 2N/L turns per unit...
  33. 1

    High dielectric strength, vacuum compatible glue

    Hi all, I would need an high dielectric strenght glue to fix PTFE or Hostaphan to the vacuum chamber wall in stainless steel, so the glue should be vacuum compatible. Force against the bonding direction would be 50N, so if the glue has already 100N it would be good but I don't think it is an...
  34. Plat

    Calculate the strength of several polycarbonate sheets laminated together

    Based on dimensions and the materials' Young's modulus, I know how to calculate the expected deflection of a rectangular sheet of material under a given distributed or point load and given various edge support conditions. I have discovered however that multiple thinner sheets when bonded...
  35. A

    3D Printed Gear Tooth strength

    HI guys, I am in the middle of a project where i have 3d printed ABS & PLA spur gears, I am looking to do gear teeth strength calculations however I am not sure how to apply the formulas. This is because of the layered structure and the infill % of the prints. Ill appreciate all help. Thank you
  36. 1

    High dielectric strength insulator

    Hello! I would need advice on insulator material I can use for an ion Thomson Parabola spectrometer. I would need to use an insulating sheet of 225x600x1,5mm and a smaller sheet of 100x100x1,5mm I found PBN having an incredible dielctric strength, but seems like it cannot be manufactured in...
  37. A

    EM radiation strength wrt time

    So I see EM radiation , visible spectrum including being portrayed as two sinewave vectors each perpendicular to other one being that of the E field the other being the B field, the field is carried by photons, let's take the visible spectrum as an example. So having a specific frequency the...
  38. D

    Elasticity (Yield Strength) of Carbon Nanotubes

    I'm trying to find the Yield strength, that is how much force can be applied to carbon nanotubes so that they stretch to the limit before plastic deformation. And also how much they stretch at this limit. Do they stretch at all? Or are they always the same length until the Ultimate Tensile...
  39. D

    Tensile yield strength of fiber reinforced plastic

    Hello! I am in a student-run engineering team that heavily utilizes fiber reinforced plastics, and I am just trying to get a better understanding of FRPs. I am wondering how exactly the fiber reinforces the plastic. Let's say the yield strength of the fiber in the 0 degree tensile direction is...
  40. Copernicuson

    I ?Measuring the Strong Force: Strength vs Distance

    Have there been any measurements of the strong force? Also its curve of the strength of the force vs distance
  41. L

    Calculating pH with and without ionic strength

    Homework Statement There are four things to be calculated: -pH of 0.00196M solution of HCl in water, without taking ionic strength into account, -The same thing but taking ionic strength into account -pH of 0.00196M solution of HCl in Na2SO4, without taking ionic strength into account, -And...
  42. caters

    Writing: Input Wanted Would humanoid strength be comparable to elephant strength?

    Keplerians, 1 of my humanoid species, are so strong, they can carry a bear with just their muscles. Humanoid weight: 200 lbs with a lot of muscle mass Black bear weight: up to 600 lbs, also very muscular That means they can carry up to 3x their weight. That is very strong. But would this...
  43. T

    Understanding Yield Strength & Stress Strain Curve

    Hi all I was hoping someone could shed some light on the following:- I am trying to understand what Yield strength is and understand the exact limit of where elastic and plastic deformation occurs on a stress strain curve. Correct me if I am wrong but I define:- Yield strength as the amount...
  44. J

    A Nuclear Processes in Other Universes: Varying the Strength of the Weak Force

    This relates to the anthropic principle and the multiverse. Nuclear Processes in Other Universes: Varying the Strength of the Weak Force https://journals.aps.org/prd/pdf/10.1103/PhysRevD.98.063014 Nuclear processes in other universes: Varying the strength of the weak force Alex R. Howe, Evan...
  45. B

    I How did Fermi calculate the strength of first nuclear explosion?

    Hi There is a story that Enrico Fermi calculated the intensity of the first nuclear test at Los Alamos from the distance moved by scraps of paper. Are there documented details of the calculation in any paper / book ? TIA
  46. N

    Finding the Earth's magnetic field strength using a Galvanometer

    Homework Statement [/B] I am working on a experiment on finding the Earth's magnetic field strength in Denmark. Using a Galvanometer and a constant power source of 5.1V and slowly adjusting the resistance, I was able to find the changes in angle in relation to the changes of current. 2...
  47. G

    B Coil B field strength with different diameters

    Hi, I have a quick question. Say I have two metal rods or tubes and I want to make an electromagnet, one rod is with a diameter x and the other rod has a diameter of x2 (two times larger) Now I take the same gauge copper wire and wrap an equal amount of turns around each of the two rods. Then I...
  48. YoungPhysicist

    Do magnets lose strength by pulling them apart?

    When two magnets already sticked to each other being pulled apart, energy is applied, so I assume that the energy is stored like some sort of potential energy which will be turned back into kinetic energy when they accelerate towards each other to stick back together. So the magnet itself...
  49. Awningguru

    Strength of Schedule 40 steel pipe

    Help I manufacture and install shade sails, typically using sched 40 steel pipe as the posts on the corners. Most pipe information displays the strength from pressure from the inside, but my real world application is to take a pipe, let's say 14' long, dig a 4' x 16" hole, and bury the pipe...
  50. B

    Do weight & strength matter in basketball?

    I am no basketball expert. I have never watched an entire basketball game in my life. However, several times in my life I have watched a few minutes of basketball games here and there enough so that I am familiar with the basics of the rules and objectives of each team in the sport of...
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