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.

View More On Wikipedia.org
Recent contents Top users
  1. T

    Determining Magnet Strength: Formula & Factors Explained

    hey guys, i was wondering if there was a formula to measure the strength of a magnet in relation to its size, and what else is needed to be known before such a value can be computed. e.g. its shape, let's say a bar magnet(you have my apology if i have posted in the wrong forum, but I'm...
  2. M

    Electric field strength at the midpoint between the two charges.

    Homework Statement A + 7.3 nC point charge and a - 2.4 nC point charge are 3.5 cm apart. What is the electric field strength at the midpoint between the two charges? Homework Equations E = 9*10^9(q/r^2) q = charge r = distance from point charge The Attempt at a Solution Since...
  3. D

    3 x3 tube, 3/16' vs 1/8 thick load strength

    3" x3" tube, 3/16' vs 1/8" thick load strength Hello, Any help would be appreciated. After calling umpteen places, and searches, I've found this site, which is a gold mine of info, and thanks for that. I am trying to figure out what the load strength of steel tubing, that is 3" x 3" 3/16"...
  4. W

    Formula to compare the strength of pipe versus C channel

    What I'm trying to do is compare pipe to channel as far as lateral strength. I have just received a patent, 7,707,794. It's for a building system of walls, fences, and buildings using steel channels and pipe posts. The current way to build a high security fence using expanded metal panels...
  5. J

    Ampere's Law: Calculating Magnetic Field Strength

    Homework Statement Homework Equations State Amperes Law. Show that the magnetic field at a distance R from a very long straight wire carrying a current I has magnitude μ I / (2 pi R) The Attempt at a Solution I really don't know :(
  6. F

    Magnetic Field Strength at a Point Along an Infinite Wire

    Homework Statement A current I flows to the right on the x-axis from the origin to x = infinity. What's the magnitude of the magnetic field at (x,y) = (0,L)? Homework Equations B = u sub 0 time I/(2 pi R) The Attempt at a Solution We use above equation since we have an extremely...
  7. S

    Magnetic Field Strength Needed

    Homework Statement Hi, I am trying to calculate the current and magnetic field strength needed to pick up a 0.3125 lb. piece of a channel lock plier made of ferritic stainless steel (they have a soft magnetic component) on its y-axis (on the lighter part of the piece) at an 80 degree angle...
  8. L

    How can you measure compressive strength?

    It's a really tricky one to work out, but does anyone have any suggestions of how to measure compressive strength? Thanks a lot.
  9. T

    Calculating Magnet Pull Force: What is the Equation?

    I am a teacher and am in the process of developing labs dealing with magnets. I have seen calculators on the internet that can calculate the pull force in pounds for a magnet when provided the shape of magnet, thickness, diameter and Br value in gauss. I have failed to find the equation used...
  10. E

    Calculate the strength of the magnetic and electric fields in this region?

    I know the template needs to be used but i don't want answers i need help starting this. What equation do i use? Here is the question: In a particular region of space, the magnetic and electric fields have energy densities of 0.2 J/m3 and 4 J/m3 , respectively. Calculate the strength...
  11. X

    Gravitational field strength unit

    What quantity has the same numerical value as the gravitational field strength, but is expressed in a different unit? g= 9.8 N/kg i can't think of anything else that's 9.8 besides g
  12. M

    Field strength between two wires

    I feel like a stupied girl. :( It think it's not very hard, but I have to have the correct answear before i send it to my school. Homework Statement We sometimes exposed to electric fields. To determine whether there is a risk of flashover is a rule of thumb which states that the sparks will...
  13. L

    Strength of a bar magnets on axis field

    1. A bar magnet experiences a torque of magnitude 0.075 Nm when it is perpendicular to a 0.50 T external magnetic field. What is the strength of the bar magnet's on-axis magnetic field at a point 20 cm from the center of the magnet? 2. torque = mu*b*sin(theta), in this case just mu*B...
  14. S

    Oxidizer Strength: Potassium Nitrate vs Sodium Nitrate

    What makes something like Potassium nitrate stronger than Sodium Nitrate as an oxidizer?
  15. W

    Help calulating bolt strength to prevent beam bending

    Homework Statement The attachment shows a side section of a water tank.(lined with Marine Ply) The section will be bolted to a fixed bottom section with 4 bolts. I'm trying to determine the size and strength of bolts required to do this. Homework Equations Hydrostatic force? UDL...
  16. K

    To investigate a factor affecting the magnetic field strength of a magnet

    1. As mentioned in the title,we were asked to investigate a factor that affects the magnetic strength of a solenoid. Independant variable is current.I used a solenoid , put it on a stand vertically,above of a magnet placed on a digitall weighing machine.I set the solenoid,a device to measure...
  17. G

    Calculating Yield Strength using a Load vs. Displacement Curve

    Hi, This question came up on my midterm and I had no idea how to answer it without redrawing the entire curve as a stress vs. strain curve (which obviously took too long to do). Anyway, I'm just requesting a general procedure, not a numerical answer. If you had a Load (y-axis) vs...
  18. I

    Dual field strength equals to itself

    \epsilon^{\mu_1\mu_2\cdots\mu_k\ \mu_{k+1}\cdots\mu_D} \epsilon_{\mu_1\cdots\mu_k\ \nu_{k+1}\cdots\nu_{D}} = (-1)k!\delta^{\mu_{k+1}}_{[\nu_{k+1}}\cdots\delta^{\mu_D}_{\nu_D]}\quad\cdots(*) where we are working in the Minkowski space. And the definition of square bracket on indices is like...
  19. B

    Investigating strength of relationship

    I was assigned a project in Applied Math and I chose to investigate the strength of the relationship between Math and Physics. My scope of tests is still limited, so I decided to first do a chi squared test (to show independence) and then determine the product moment correlation coefficient...
  20. F

    Frequency Dependence of Dielectric Strength

    Does anyone know what the relation between frequency and dielectric strength is? I'm mainly concerned with the dielectric strength of air in the High Frequency and Very High Frequency Ranges (3MHz - 300MHz). Thanks.
  21. Z

    Find the Electric Field strength

    Homework Statement "A copper cable carrying 50A current has radius 0.003m. What is the electric field if copper has a resistivity of 1.7x10^-8 Ohm/m?" Homework Equations Formula for current density etc. The Attempt at a Solution So I write: \vec{\mathbf{J}} = n|q|v_d = \frac{I}{A}...
  22. S

    Action potential and strength of muscle contraction?

    Hello guys, Although the response of a motor unit is all-or-none, the strength of the response of the entire muscle is determined by the number of motor units activated. Nerve impulses passing down a single motor neuron will thus trigger contraction in all the muscle fibers at which the...
  23. J

    Electric Field strength of sphere

    Hi everyone I just need some help with this question. Its a simple one I'm pretty sure. Homework Statement A solid sphere of radius 3 cm is made from a conductor and has a charge of + 4 uC placed upon it. What is the electric field strength 1 mm from the centre of the sphere? Homework...
  24. J

    Need help understanding off axis electromagnet field strength equation

    I have this equation for the magnetic field strength of an electromagnet but it’s in the form of multiple polynomials. Here is the page where they all are: http://www.netdenizen.com/emagnet/offaxis/solenoidoffaxis.htm since it gives values for e_8 and p_8 I tried using the main equation up...
  25. K

    Is Love Just a Chemical Reaction or Something More?

    Hypothetically, say we have X, who's in a relationship with Y. Y is not sure that it's in love with X; which makes X insecure as X is. Or at least, that's what I always see around me. But think about it, wouldn't it be an advantage for X if Y wasn't? I mean, Y acts the way it acts towards Y any...
  26. G

    Measuring Electric Field Strength

    I have to construct an experiment which measures the electric field strength at various distances from a charged Van Der Graaff generator. How would i go about this?
  27. A

    RSSI (Received Signal Strength Indication) and Interference

    Hi, I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference? Thanks
  28. S

    Combined gravitational field strength

    Homework Statement 2 masses, 5k and 10kg are fixed in place at the coordinates 1,0 and 1,1 respectively. what combined gravitational field strength do they produce at the point 0,0? Homework Equations g = GM/r^2 The Attempt at a Solution total g = G(5)/(1)^2 +G(5)/2 not the right answer...
  29. D

    Calculating electric field strength

    Homework Statement http://img219.imageshack.us/img219/3310/problemi.png Homework Equations F = kq/r^2 The Attempt at a Solution O ----- x ----O -----------O Let the electric field of the first O be E1, second be E2, third be E3. RED - .02m BLUE - .016m GREEN - .033m E1...
  30. L

    Estimating electric field strength

    1. Estimate the electric field (strength and direction) at the point A. 5cmx5cm gridL 2. E = -dV/ds 3. I had four options, each a combination of 500 or 1000V/m for the E field strength and then left or right for the direction. I knew it must be to the left because the field...
  31. A

    Calculating Magnetic Field Strength for Sodium Zeeman Splitting

    Homework Statement Estimate the strength of the magnetic field for which Zeeman splitting of the 3p energy levels in sodium equals the energy due to spin-orbit coupling Homework Equations The Attempt at a Solution I know the equations for spin orbit and the zeeman effect, and I...
  32. P

    Assessing Dam Strength with a Simple Model

    Homework Statement Consider a simple model of a dam. A reservoir of water behind the dam is filled to a height h. Assume that the width of the dam is L. As the reservoir behind a dam is filled with water, the pressure that the water exerts on the dam increases. Eventually, the force on the...
  33. E

    If the strength of gravity levels off, could black holes be unphysical?

    In GR, the strength of gravity goes to infinity at singularities. But what if in nature, gravity increases up to a certain cut-off, and does not continue to increase. If the cut-off is sufficiently low, could it be gravity is not strong enough to overcome pauli exclusion principle, and...
  34. G

    Calculating Magnetic Field Strength and Direction in a Multi-Wire System

    please help?? 1. Homework Statement I got 1/2 of this problem right, but I am not sure of the other part. I have attached the picture. The questions are as follows (with the answers that I am sure of) -- What is the magnetic field strength at point 1 in the figure? What is the magnetic...
  35. G

    Calculating Magnetic Field Strength and Direction in a Two-Wire System

    Homework Statement I got 1/2 of this problem right, but I am not sure of the other part. I have attached the picture. The questions are as follows (with the answers that I am sure of) -- What is the magnetic field strength at point 1 in the figure? What is the magnetic field direction at...
  36. P

    Mobile 'Lights': Impact on Signal Strength?

    mobile "lights" I have seen some light making stickers sold that can be put on your mobile and they emit light when you talk. Am I right that they will lower my chances of getting connected when I am far from the antenna? I mean they must somehow make signal weaker, don;t they?
  37. D

    Compressive strength - concrete

    in compressive tests of concrete blocks in a lab, there must be maximum contact between the press and the concrete, i am told that if you place a piece of waxed paper between the press and the concrete, or even if one of the surfaces is slightly wet, your results will be very distorted and even...
  38. I

    Ionic Strength Calculation: How to Account for All Ions in a Solution?

    Hi, I have a solution containing acetic acid and NaCl. The solution is adjusted to a particular pH value by adding NaOH. For the calculation of the undissociated acetic acid concentration, I use the correction suggested by Sortwell 2001 (J. Food Prot. 63(2): 222-230 (2000)), which says that...
  39. Z

    Gravitational field strength at latitude

    This figure is captured from my physics textbook and it is about the gravity at latitude http://pix.gogobox.com.tw/out.php?i=567045_.JPG I want to know the difference between mg0 and mg(theta). Which one is the weight of the object? Thank you!
  40. S

    Magnetic Field Strength (Integral needed)

    Homework Statement You have 10 m of 0.55 mm diameter copper wire and a battery capable of passing 13 A through the wire. What magnetic field strength could you obtain inside a 2.8 cm diameter solenoid wound with the wire as closely spaced as possible? Homework Equations Turns of a...
  41. B

    Can monoprotic acids produce a greater pH change than diprotic acids?

    Sulphuric acid is a diprotic acid that dissociates completely when dissolved in water. How does a monoprotic acid like trifluoromethanesulfonic acid produce a greater pH change than H2SO4?
  42. D

    What is the force between two magnets with different magnetic field strengths?

    Homework Statement Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 55 N. With how much force, then, does magnet B pull on magnet A? Homework Equations unknown The Attempt at a Solution unknown
  43. A

    Dilution & Strength: Is More Concentrated Better?

    Is it right to say that a dilute acid is stronger than the same acid which has higher molarity? By Ostwald's dilution law I can say that dissociation degree for the dilute sample is more. So it is a better electrolyte. But I also find that pH for concentrated sample is appreciably more...
  44. M

    Bearing strength of square tubing

    I'm designing a single axis PV solar tracker. Square tubing will be the structural member of the axis. U-bolted cross members will support the solar panels. Each section of square tubing will be 10'-0" long between supports. Four cross members and four solar panels will attach to each 10'...
  45. E

    Calculating strength gravity over light years

    How do I calculate the strength of gravity between two objects say that 2 years ago were 2 light years apart, during which they became 0.5 light years closer, if during those two light years, the stars lost 50% mass due to fusion and light, based on their mass "now", or based on how much...
  46. V

    Magnetic field strength between two wires

    wire 1 has a current of 1A directed into the page, wire 2 is 20 cm to the right of wire 1 with a current of 1A, what direction does this current have to flow in order for the magnetic field strength at the mid point between them to be non zero ? from the right hand rule the mag field from...
  47. A

    Exploring the Relationship between Electric Field Strength & Potential Gradient

    Homework Statement What is the relationship between electric field strength and the potential gradient? Homework Equations The Attempt at a Solution This is my Calc based Physcis lab question but I am at a total loss. I do not understand what potential gradient is in the...
  48. JJBladester

    Limit Problem - Electric field strength of an infinite line of charge

    Limit Problem --- Electric field strength of an infinite line of charge Homework Statement What is the limit of the following equation? Homework Equations \stackrel{lim}{L\rightarrow\infty} \frac{K|Q|}{r\sqrt{r^{2}+(L/2)^{2}}} The Attempt at a Solution The book gives an answer...
  49. B

    Understanding the Ultimate Strength of Steel

    I have neither physics nor engineering backgrounds. I am trying to figure somethings out, and I need some basics cleared up. I will pose my questions as such: 1.) How would you go about rating the strength of steel? 2.) How would you go about testing the strength of steel? For example: is it...
  50. A

    Strength of material, how to know it is compressio or tension?

    Homework Statement May i know how to know boom and rod, which is in tension and compression? http://img7.imageshack.us/img7/5728/16203309.gif http://img7.imageshack.us/img7/2595/57134603.gif Homework Equations The Attempt at a Solution
Back
Top