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. R

    Electric Field Strength Between Two Charges

    Homework Statement Two isolated point charges, -7 μC and +2 μC, are at a fixed distance apart. At which point is it possible for the electric field strength to be zero? (A)......(B)...(C).....(D) o----------------------o----------o---------------o ......-7 μC...+2 μC...
  2. A

    How to calculate magnetic pole strength?

    I have 2 magnets , i need to know the force between them , I searched a lot , conclusion was : we need to use a dipole-dipole interaction equation , which included m, which the magnetic dipole , i searched how to calculate it , and this is what i found . m=pl where p is magnetic pole strength...
  3. Greg Bernhardt

    Excedrin extra strength vs excedrin migraine

    excedrin migraine is more money but they contain the same exact ingredients. Total sham!
  4. C

    HSS 4X4X1/4 -Compressive Strength

    I'm looking to replace a 6x6x12 pressure treated post with 4x4 steel tubing. I was looking at a steel handbook and according to the "design strength in axial compression," a HSS4X4X1/4 for an "effective length" of 12ft is 72 Kips (72,000 lbs). Of course you still need to consider bracing...
  5. M

    Field strength is the potential gradient graph question

    Homework Statement By use of the graph in part (a), calculate the gravitational field strength at a distance 2R from the centre of the Earth. Homework Equations g = delta V / Delta r filed strength is the potential gradient The Attempt at a Solution I have drawn the...
  6. M

    The homogeneous strength of the Higgs field

    Dear Physics Forum, As I understand it, the Higgs field is a quantum field that stretches throughout our universe. Particles that carry mass (for example protons and electrons) acquire this property by interacting with the (local) Higgs field. I assume this interaction can be written in the...
  7. D

    Strength of Mild Steel 1/16" Wall Tubing

    I am working with mild steel 1/16" wall tubing. I am sleeving this over another tube to extend it. The attachment point is 12" past the end of the sleeved tube. How much weight can the extention tube handle before it would bend? Thanks
  8. Crazymechanic

    What limits the strength of a field at a given point in space?

    Ok even though Vanadium recently asked me to stop this stupid way of learning something through asking the same questions , even though their not all the same , I'll try my cards with this one.Ok so we have fields like gravitational, electric and magnetic , now theoretically the fields don't...
  9. E

    Relation Between the Magnetic Field Strength and Distance

    Hey guys, I have recently performed a lab where we are to find the equation relating the magnetic field strength to a distance from a dipole in both the transverse and longitudinal direction. We did this using a Hall Effect Probe and a magnetic dipole. What I found after plotting a Log...
  10. P

    Magnetic field strength in hysteresis?

    Hi, I have been reading about magnetic hysteresis and all sources refer to magnetic field strength (H) as having the units (A/m). Why is it just amps/meter and not ampere-turns/metre as H = NI/L and not N/L? Is there another equation for H that I am unaware of? Cheers.
  11. O

    Capacitor Fringe Field Strength on Axis

    Homework Statement Show that the transformation w = e^{z} + z maps the infinite lines y = \pm\pi into semi-infinite lines u \leq u_{0}, v = \pm\pi. This is equivalent to transforming an infinite or edgeless parallel-plate capacitor (z-plane) into a parallel plate capacitor (w-plane). Sketch...
  12. 1

    Calculating Tensile Strength of Stainless Steel Sample

    Hello, Just want to check that I am calculating something correctly if this is ok; I did a tensile test with some rectangular stainless steel samples and got the resulting max force reached for each sample. if the max force experienced was 410N and the samples CSA is 2mm^2 then the...
  13. A

    Superconductor: Magnetic Field Strength VS distance

    Hi all, Does anyone know how the magnetic field strength of a superconductor varies as distance from the outside of the superconductor? Aside from a superconductor being able to creates a stronger magnetic field than a regular dipole, does the strength still go down as 1/r^2 or does it...
  14. S

    Electric Field Strength Conservation in Direction of Motion

    (Sorry for the typo in the title. I don't know how to get rid of it) Recently I was looking at the Lorentz co-variance of F=dA (the Faraday 2-form) and *F=*dA (the Maxwell 2-form). I realized that Lorentz co-variance implies that the electric field strength and magnetic field strength are...
  15. M

    What is Gravitational Field Strength in General Relativity?

    "gravitational field strength" Hi all, I've been reading some lecture notes by G. t'Hooft, available from http://www.staff.science.uu.nl/~hooft101/lectures/genrel_2010.pdf On page 12, t'Hooft is discussing the Rindler space of an observer using co-ordinates \xi^{\mu} with constant...
  16. U

    Electric field strength and electrostatic potential

    1. The problem is in the attachments. 2. Field strength is equal to voltage divided by distance 3. I want to make sure that i understand a few things before i solve this problem! i would like to know your opinion! a) first, field strength is inversely proportional to the the distance squared...
  17. S

    Increasing Soundwave strength w/o affecting its characteristics?

    First please forgive my general lack of intelligence of this matter. I am a saxophone player looking to help new sax players and need some expertise for a training aid I'd like to create. On a saxophone, a player blows air through a mouthpiece creating a sound wave. The very tip of the...
  18. J

    Strength of cylinder as function of internal pressure

    I understand that a cylinder oriented vertically and bearing a load can be made more resistant to buckling by adding pressure to the (closed) cylinder. For example, an unopened can of soda pop can bear much more load than an opened soda pop can (I found a youtube video showing an unopened can...
  19. J

    Exploring Magnet Strength Over Distance: Joe's First Post

    Hello Physics Forums World this is my first post so please be gentle. I am working on a project and wanted to understand the strength of magnets over distance. Imagine, if you will, two magnets both with a gauss of 3600, the opposite poles are facing each other. how would I calculate...
  20. S

    Calculating buckling strength of steel pipe for non-axial load

    Hello All, I am in the process of creating a 33' tall chaotic pendulum, and cannot find any calculations for the buckling strength of pipe. The pendulum swings from side to side, but is stopped as it goes too far one way or another by a limiting cable attached to a sleeve over the pendulum...
  21. O

    Commutator between covariant derivative, field strength

    Hello, i try to prove that ∂μFμ\nu + ig[Aμ, Fμ\nu] = [Dμ,Fμ\nu] with the Dμ = ∂μ + igAμ but i have a problem with the term Fμ\nu∂μ ... i try to demonstrate that is nil, but i don't know if it's right... Fμ\nu∂μ \Psi = \int (∂\nuFμ\nu) (∂μ\Psi) + \int Fμ\nu∂μ∂\nu \Psi = (∂\nuFμ\nu) [\Psi ]∞∞...
  22. P

    Design experiment to determine bending strength and torsion of ruler

    hello everyone! so as the title suggest, i wonder if anyone would have any idea to design a simple experiment to determine the bending strength and torsion of a plastic ruler. it doesn't need to be extensive, as the value of the strenght itself isn't important. i just want to know e.g how...
  23. A

    Ferromagnetic resonance oscillating field strength

    Hello. What oscillating field strength, in tesla, is required to cause the magnetization vector of a ferromagnetic material to precess with a fairly large angle at its resonance frequency? I can't find this number anywhere!
  24. P

    Does the strength of an electric field in a wire change with shape?

    If I have a charged wire and shape it into a spiral, is the electric field stronger?
  25. rkatcosmos

    What's the meaning of strength?

    I am coming across definitions which says certain substances (like martensite) are hard but brittle. I can't understand the meaning. Brittle substances have yield strength closer to breaking strength. If something breaks/fails easily then how can it be hard..? Pls help me out with some numbers...
  26. HakimPhilo

    What is the strength of the strong force?

    Hello everybody! :shy: What is the strength of the strong force between, for instance, a proton and a neutron separated by a distance on the order of femtometers (1fm and 2fm and 3fm) in Newton? Thank you in advance! ∞
  27. P

    Calculating pole strength from Tesla?

    T = N/A.m If T = 0.3249 N = 90N 90/0.3249 = 277.00 A.m Source. If not, can anyone please direct me on how I can calculate the pole strength, and magnetic moment too?!
  28. S

    Magnetic field strength in two wires

    1. Multiple choice problem, the prompt is the following: Two wires carry currents is opposite directions, as shown below. The wires are separated by a distance of 0.02 meter, and points P and Q are located 0.01 meter above and below the bottom wire. Compare the Magnetic field strength at...
  29. P

    Electromagnetism, finding magnetic field strength

    1. A 0.034 kg copper rod is hung by two wires and placed in a constant magnetic field. A current of 14 A runs through the 0.050 m long copper rod, making it hang at an angle of 34° from the vertical as attached in the diagram. What is the magnetic field strength holding the copper rod in...
  30. AJKing

    Largest mass for Ultimate Tensile Strength

    Vibrations and Waves, A.P. French, questions 3-9 Please /do not/ provide full solutions. Just suggestions. Homework Statement A solid steel ball is hung at the bottom of a steel wire of length 2m and radius 1mm, the ultimate strength of steel is 1.1E9 N/m2. What are the radius and mass of the...
  31. AJKing

    Ultimate Strength vs. Young's modulus

    What is the threshold where Young's modulus stops being applicable, and ultimate strength becomes relevant?
  32. V

    Carbon fiber raw strength vs laminates

    If raw carbon fiber has strength of say 4000 mpa, how come it is reduced when put in epoxy laminate to become only 950 mpa?
  33. T

    Calculating the appropriate cable strength.

    5 years ago I was at penn state, for engineering of all things. I did things similar to this but everything is eluding me at the moment. My situation: I have a car that I've attached a class 1 trailer hitch. Its rated at 2000lbs and i don't intend on towing more than 1000 lbs. For a...
  34. 4

    The strength of electromagnetism in an atom?

    I realize atoms are held together by STRONG electromagnetism, but if you were to convert this energy into an everyday scenario, how strong would it really be? I'm trying to explain the power behind a small atom and I feel using a 'real', known object. Thank you in advance for any answers.
  35. 4

    Question about value of the metric tensor and field strength

    Is it the value of the metric tensor that determines the strength of a gravitational field at a specific point in spacetime?
  36. P

    Finding strength, pull, telsa (anything) of an electromagnet

    I have built a new electromagnet, my second one so far, in an attempt to make it better. I am trying to find its strength, whether that be in tesla, holding force (kg) or whatever other units there are, just so I can compare it with other magnets. What I have is a steel bolt wrapped with...
  37. C

    Gauge transformation of Yang-Mills field strength

    Hi. I'm reading about non-abelian theories and have thus far an understanding that a gauge invariant Lagrangian is something to strive for. I previously thought that the Yang-Mills gauge boson free field term ##-1/4 F^2 ## was gauge invariant, but now after realizing that the field strength...
  38. W

    Magnetic field strength infinitely long wire

    I'm new to posting on this forum so excuse me if I'm using the wrong symbols underlined := vector/vectorfield δ := derivative uvar := unit vector Homework Statement Consider a finitely conducting wire of infinity length with radius b. The wire is centered about the z-axis. Current is...
  39. R

    Find the velocity and strength of magnetic field from the given info

    Homework Statement A 7.00-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.320Ω . Pulling the wire with a force of 1.30N causes 4.50W of power to be dissipated in the circuit. What is the speed of the...
  40. I

    Gravitational field strength of 0

    Homework Statement A planet of mass 1.88x10^21 kg has a moon of mass 4.56^10^19 kg. The distance between their centers is 3.94x10^8 m. How far from the center of the planet (along the line joining the planet and the moon) is the net gravitational field strength, due to the two bodies, equal to...
  41. K

    Calculating the Field strength of a magnet at a certain distance

    Is there a way to calculate the magnetic field strength, B, of a magnet (permanent magnet, not an electromagnet) at a certain distance? I assume it follows the inverse square law, but other than that, I do not know what to do. Tools I have available: permanent magnet ammeter/voltmeter...
  42. D

    Gravitation equations and expressions - gravitational field strength

    Homework Statement i have 2 questions on my holiday homework that I am not 100% sure on they are: Homework Equations 1) write down an algebraic expression for g at a distance r from the centre of the planet. The planet can be treated as a point mass of magnitude M as its centre AND 2) write...
  43. P

    How to find the strength of an electromagnet

    I have created a simple electromagnet that is just an iron railroad spike with some thick insulated wire wrapped around it. This is connected to a dodgy, old motorbike battery (I'm thinking of being a decent battery...). I have looked up how you measure the strength, but I'm not sure what is...
  44. T

    Would a magnetic charge have the same strength as a electric charge?

    If magnetic charges existed, would the strength of the field be the same as a electric charge? Would you be able to plug it into the equation of coulomb's law? If so, what would the constant be? The same?
  45. E

    Do I have to re-define electric field strength in Centre of Mass frame

    So let's say I'm computing the torque as a result of the interaction between two electric dipoles in the lab frame. Let's imagine they are in some electric field. I then do : τ = r×F If I now switch to the centre of mass frame I have to find their position vectors from the COM. Why do...
  46. J

    Not sure about the strength of my grad application

    Not sure about the strength of my grad application (MATH)... Hi all, Sorry to post another typical grad application question, but I really need some guidance on appropriate math grad schools I should apply to. My advisors don't seem to know much. Could anyone give me a rough idea of where I...
  47. R

    Find the Electric field strength at a point between two charges

    Homework Statement See images Homework Equations See images The Attempt at a Solution I have tried parts C and D several times, and the homework program is telling me that it's still not correct. For C, I keep getting: 7.7x10^8 N/C for D I keep getting: 7.1x10^-12 N/C...
  48. M

    Strength of materials

    A mild steel solid shaft is to be replaced by a stainless steel hollow shaft of the same outside diameter. Calculate the ratio of internal diameter to external diameter of the hollow shaft for equal strength. Also find the percentage saving in weight if density of mild steel is the same as...
  49. T

    Help Experiment determining the Earth's magnetic field strength

    I am in my senior year of school and I have been given a research task to do on the Earth's magnetic field in a given place. I have to come up with a full method for the experiment to perform in class in a week or so and then I need to use equations to create a discussion and show how I found...
  50. C

    Calculating electric field strength, potential difference, and force.

    Homework Statement I'm pretty sure I have done questions 1 to 4 correctly, it is just question 5 I am struggling with. I have an exam in one week and this is revision so it will not get marked by a tutor, and it would really help if someone could give my answers a quick check and help me...
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