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. R

    Difference between the acid strength of inorganic and organic acids

    Homework Statement Hi. I'm pretty much a beginner in organic chemistry and I'm just wondering something. For example, I know that HCl is a stronger acid than HF. But... then why the following happens if a have an organic acid (e.g a carboxylic acid)? According to what I see, a...
  2. F

    How Is Theoretical Fracture Strength Calculated for Glass?

    Hi, I was wondering what the equation is to calculate theoretical fracture strength if you know the elastic modulus and flexural fracture stress? Homework Statement The flexural fracture stress for ordinary (i.e., soda-lime) glass is around 30–70 MPa. Based purely on the elastic...
  3. C

    Strength to Weight & Modulus to Weight

    Homework Statement σ=230MPa (tensile strength) E=15GPa (modulus) ρ=1.85 g/cm^3 (density) Homework Equations Strength/Weight = σ/ρ Modulus/Weight = E/ρ The Attempt at a Solution Strength/Weight = σ/ρ = 230x106 N/m2 / 1850 kg/m2 = 124324.32 (Units?)...
  4. D

    Gravitational field strength for irregular object

    Hi all I'm trying to work out what the surface gravitational field strength of an irregularly shaped body would be (for example Mars' moon Phobos). I know that for a sphere, any point outside it can consider all the mass to be at a point inside it, but for something that's potato shaped, how...
  5. C

    Resultant gravitational field strength

    Homework Statement Consider the objects X and Y, each of mass 8000kg and 2000m apart where XYP forms an equilateral triangle. Determine the resultant gravitational field strength at point P due to objects X and Y. Homework Equations G= GM/R^2 The Attempt at a Solution
  6. M

    What factors contribute to the strength of an atomic interaction or bond?

    hello! which factors determine, which parameters affect, the strength of an atomic interaction or bond? thanks!
  7. S

    Strength of a bond in a molecule

    √Homework Statement Carbon monoxide molecule, which has a reduced mass of 6.85 amu, absorbs infrared radiation wavelength of 4.6um. if the absorption is due to vibrational transitions, calculate the strength of the bond in molecule Homework Equations u=(m1*m2)/(m1+m2) The Attempt at...
  8. W

    Choosing a Major: Strength or Passion?

    Im on the verge of choosing my major and i have a quick question for everyone. Do you necessarily think that with passion comes strength in a certain field? I am positive that being good at something does not breed a passion for it, but what about vice versa? I recently discovered my...
  9. V

    Wall Strength of a Shipping Container

    I'm going to bolt some hooks to the inside walls of 20ft and 40ft shipping containers. What I'm wondering is, what would be the easiest way to determine the stress on the corrugated steel walls, excerted on it by placing things on these hooks?. The hooks are 280mm apart and the force will be...
  10. D

    Electric field strength between two points.

    Homework Statement Find the electric field strength at point P, which is located midway between charges A and B. The charges are separated by 20 cm. The first charge has a charge of 20 micro coulombs. The second charge has a charge of -30 micro coulombs. Homework Equations Electric...
  11. L

    Solving for Electric Field Strength & Direction of Charged Sphere

    Homework Statement What are the strength and direction of an electric field that will balance the weight of a 1.0g plastic sphere that has been charged t0 -3nC ? Homework Equations E= F/q The Attempt at a Solution Newton's laws on the charged sphere ƩFnet(y) = F -mg=0...
  12. C

    Metal tensile strength question

    I have some 1/4" thick 304 stainless steel formed in a 90 degree "L" shape (2 1/4" up x 2" flat x 2" wide. What force is required to bend pc beyound 90 degree mark (let's say to the 100 degree mark)
  13. C

    Rubber compression strength question

    Need help in determining the impact force strength of a door stop rubber. It is a urethane rubber formed in a triangular shape. I used a 50t press with a 2" round shaft to compress rubber product and it required 100 lbs of force to compress. I believe this worked out to 18.75 ft lbs to...
  14. Y

    Gravitational field Strength Inside the Earth

    Since the Gravitational Attractive Force is given by, F_g=(Gm_1 m_2)/r^2 Let m_1be the minor mass of a small body (e.g. human) let m_2 be the massive mass of a huge spherically symmetric body (e.g. Earth) Let r be the...
  15. S

    Free Fall and gravitational field strength

    Hello. For free fall to occur, does the rate at which you fall have to equal the gravitational field strength at that point above the surface? If I'm in an airplane and accelerate towards the ground at an acceleration of 9.8ms^-2 equal to that of the Earth's gravitational field, then I...
  16. Pengwuino

    Medical Strength training while dieting = weight gain?

    The title is a bit deceptive but I've been very curious about something that many people who diet have found. Over the course of a few months, I was losing weight at a steady pace of 2lb/week. At one point I decided to make the most of my gym membership and start doing resistance training as...
  17. D

    Strength of Bonds: List in Ascending Order

    Can anyone list these bond types in ascending order based on their strengths ionic bonds, covalent bonds, metallic bonds, hydrogen bonds, van der waals forces
  18. P

    Gravitational field strength equals zero?

    There is a point between Earth and moon where the gravitational field strength is zero. What about the same thing with three or more objects? With three of more objects, is there always at least one point where the gravitational field strength due to the objects is zero? Why / Why not?
  19. R

    Strength of magnets in an array

    Hello all, I need to make a magnetic surface using neodymium disc magnets... the purpose for the surface is to hold on to a sheet of ferrous material, as strongly as possible. I tend to want to assume that a checkerboard array would be best... alternating the poles of the magnets in the...
  20. D

    Universal gravitation 6-determine strength of gravitational field

    Homework Statement The moon has a mass of approximately 7.34x1022kg and a radius of about 1785 km. Determine the strength of the gravitational field on or near the surface of the moon. Homework Equations I have made a list of equations that are relevant for this entire module on...
  21. T

    Electric field strength of van de graff generator

    A VDGG is used to produce a large PD. The dome of the generator has a radios of 0.15m. It is charged and gets a PD between the dome and the Earth of 75kV. The charged stored on it is : 5.0 x 10-6C Answer: Use of E = Q/4∏εr0. 3.0 x 105 My attempt: E = kQ/r2 = 8.99 x 109 x 5.0 x 10-6 /...
  22. J

    What is the strength of a delta function.

    Hi all, I read the following: "If g(t) starts with a delta function of strength Y/2, then..." I wonder what that means. Does it mean g(t) = 0.5Yδ(t) ? Thanks
  23. E

    How can i find breaking strength of steel, if it's possible at all?

    Homework Statement For my project I need to calculate the maximum height that a Steel Rope could achieve while being hung between the Earth and the Moon. Homework Equations Tensile Strength of Steel is: 500*10^6 E of steel is: 200*10^9 distance from the Moon to he Earth is 406700...
  24. P

    Oscillator strength of mixed LH- and HH-excitons

    This concerns calculation of Rabi splitting of exciton polaritons when the exciton states are mixed but the mixing is known, i.e., the coefficients of the mixed states are known. I read from a thesis that the Rabi splitting is proportional to the square root of the oscillator strength. Is...
  25. W

    Find the current given length and magnetic field strength

    Homework Statement What is the current in a long wire if the magnetic field strength 1.0 cm from the wire's axis is 55 mu T. i know magnetic field strength which is 1 cm i know the length which is 55 milli-tesla. I need to find Current in Amperes which is I. The chapter gives me the...
  26. T

    How to determine bond strength

    Is it possible to determine the strength of a bond given the elements involved and the order of the bond? If so, how does one go about doing so? The reason I'm asking is because I'm considering trying to code an analytical chemistry library as a way to increase my understanding of chemistry...
  27. R

    How does electronegativity affect bond strength?

    How does electronegativity affect bond strength? whats the strongest bond polar covalent, nonpolar covalent, or ionic how does electronegativity affect bond strength some people say the more electronegative the molecule the stronger the bond, so than shouldn't ionic bonds be stronger than...
  28. F

    Electric Field Strength Inside Concentric Uniformly Charged Spheres

    Homework Statement The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres. Which of the following situations could the graph plausibly represent? (There may be more than one...
  29. R

    Internal thread tensile strength

    calculation of internal thread tensile strength Hi All! I've got a coupling device that has two internal threads of different pitch, length, diameter. The smaller thread takes a lifting bolt, the larger attaches to a piece of machinery. I've been asked to work out the safe working load (SWL)...
  30. K

    Where Electric Field Strength + Potential are Zero?

    Homework Statement draw equipotential lines and electric field lines for the following arrangements of charges: a) +4 at (3,5) b) +4 at (3,5) and +4 at (6,5) c) +4 at (3,5) and -4 at (6,5) d) +5 at (3,5) and -2 at (6,5) e) +4 at (3,4), (7,4), and (7,7) f) +4 at (3,4) and (7,4) and -4 at...
  31. E

    Variations in the strength of gravity throughout the earth

    Which parts of the Earth is gravity stronger than usual, at higher points on the Earth is the gravity stronger or weaker than the lower points and why?
  32. S

    Understanding Axial Forces and Section Properties in Strength of Materials

    Homework Statement I am having trouble with question 1 on the attachment posted. I understand that i need to get the area of the 2 bars. I am just not sure what to do with the forces. ALso i know the picture may be dark. P2 starts at point B and is pulling to the right and P3 starts at...
  33. E

    Self-Dual Field Strength in complex coordinates

    Hi guys, I have to brush up my knowledge about self-dual Yang Mills and I'm reading an ancient paper by Yang about it...and of course I'm stuck...although Yang writes 'it is easy to see that'... Ok, so the self-duality condition of the YM field strength tensor is defined as...
  34. A

    Mechanical Strength of Black Iron Pipe

    If you were to mate a 1 ½” black iron pipe to a 1 ¼” black iron pipe using a 1 ½” coupling and a bushing reducer, how much bending torque would be needed before one of the parts or connections failed? That is, if you held the 1 ½” black iron pipe in a fixed position and the applied a force to...
  35. C

    How to Calculate RMS Magnetic Field Strength from Sunlight Power Density?

    Homework Statement the power density of sunlight, at the earth, is roughly 1 kilowatt/meter^2. How large is the rms magnetic field strength?Homework Equations The Attempt at a Solution I tried using the equation for power density S = E(rms)^2=√(εμ), then substituting B(rms)/c for E(rms), and...
  36. M

    All bones in human body are equal in strength.

    Why does many sites always said the femur is the strongest and heaviest bone in the human body? I know the femur is the longest bone, but is it really that the femur is the strongest and heaviest bone in human body? This is a link where it is said that human femur and humerus are nearly equal in...
  37. I

    Controlling Strength of Electromagnets: Risks & Effects

    sorry if this thread is in the wrong place.. basically it's to do with electro magnets.. can you control the strength of them by something like a pedal? as in if you gradually push it the strength gradually increases? also would it be a health risk if you were right next to electromagnets...
  38. E

    Electric Field Strength and Potential

    Page 10 part (b) (ii) <click on the link Now, the question states : Use Fig. 4.2 to state and explain the distance x at which the rate of change of potential with distance is maximum Now electric field strength = negative potential gradient So in effect they're asking for the point at...
  39. L

    AI- firing strength for output with 2 different inputs

    Question: IF x is A AND y is B THEN z is C where A=0.1/1 + 0.4/2 + 0.7/3 + 1.0/4 + 0.6/5 + 0.2/6 + 0.1/7 B=0.3/1 + 0.8/2 + 1.0/3 + 0.6/4 + 0.5/5 + 0.3/6 + 0.2/7 C=0.3/1 + 0.5/2 + 0.7/3 + 1.0/4 + 0.8/5 + 0.4/6 + 0.0/7 Find the fire strength and evaluate output z: a) for x which is a...
  40. C

    U Channel Deflection and adding ribs for strength

    Hi everyone, I am trying to find out what the deflection would be for some steel U channel cold worked from sheet. U channel would be 2.250 in. (depth) x 1.0 in. (wide) x .040 (web thickness). Case (1) Supported at both ends. Length 50 in. Load 72 lbs. evenly distributed. Case (2) Same as...
  41. T

    Glass-silicone-glass bonding (tension vs shear strength?)

    I'm attempting to repair a glass aquarium. Here is a drawing I made when I ordered it originally, the top brace has developed 2 small cracks. So I'd like to empty the tank, then remove the old brace, and replace it. But I'm trying to figure out what dimensions I need the new piece to be...
  42. N

    Calculating the field strength of an alternating magnetic field

    I have a solenoid copper coil 7 cm lengths, 5 turns, r =0.75; applied current 145 V; 0.73 A; frequency 1.10 MHz and I'm still not able to calculate the magnetic field strength in kA/m. Can you help me? I tried a number of formulas, but I just don't get it. :confused: Please point me in the...
  43. O

    Estimating the receiving signal strength 2.4ghz

    Hello every1 .. i am sophomore so excuse me if i ask anything stupid/obviouse. so there are allot of proximity devices but with short range so i was thinking of making one with 2.4Ghz ℝℂ tx & rx. these typicaly have range to about 1km. So all i want to know is if there is a way to connect...
  44. M

    How Did Mighty Atom's Hair Defy Physics?

    'It is a fact that this modern Samson's hair was so strong it could not be pulled out. One of the most astounding feats of strength ever seen was headlined by the Buffalo (New York) Evening Times on September 29th, 1928: "Mighty Atom -- Super Strong Man Pits Brawn Against Plane, Wins." At the...
  45. R

    Electromagnetic field strength

    hello world. it is know that electrostatic (coulomb's law) and magnetostatic (biot-savart law) fields lose their strength like 1/r^2. why do they say that electromagnetic field falls like 1/r ? is that true ? if yes how, can you explain please ? after all energy radiated from a point source must...
  46. L

    Difference beteween Strength, Hardness and Toughness

    Hi, am I right to say that: Hardness is a material's resistance to plastic deformation. E.g. if a spoon is hard, it's difficult to bend it. Toughness is how much deformation a material can undergo before fracture. E.g. how much energy a spoon can absorb while deforming before it breaks...
  47. C

    Distance away to create the same magnetic field strength?

    1. Homework Statement At what distance (in m) from a very thin, straight wire carrying a 38 A current would the magnetic field strength be the same as a refrigerator magnet of 4.35 x 10-3 T? 2. Homework Equations B=(μo/2pi)*(I/d) where μo=4pi*10^-7 3. The Attempt at a Solution...
  48. C

    Strength of materials - neutron stars

    I have a scientific background in materials science. However this is one type of material that we don't exactly learn about! Let's say you have a neutron star approaching a comparable mass black hole. As the neutron star approaches the event horizon for such a comparable black hole, tidal...
  49. K

    Electric field strength and electric potential in a sphere

    Given a solid metal sphere where all the positive charges are distributed evenly on the surface of the metal sphere. My textbook says that there is no electric field strength in the middle of the metal sphere because the charge = 0. However, my understanding is that wouldn't the center of the...
  50. S

    Is Filling 4 Tube Steel with Concrete a Stronger Option for Sail Shade Supports?

    I am currently installing some sail shades in my back yard. The manufacturer is callin for 6" tube steel supports but I believe that 4" tube steel filled and compacted with concrete will provide more strength and resistance to buckling. Obviously I am concerned about price but want to do a great...
Back
Top