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. E

    Could gravity's strength also require denisty as an alternative to MOND

    MOND has been one alternative to DM. It is based on modifying acceleration of F=MA. As another alternative, could the strength of the force of gravity be much weaker than expected or predicted by GR when density is low, and as strong as expected by GR when density is above a threshold?
  2. R

    Initial electric field strength

    Homework Statement The initial electric field strength between oppositely charged parallel plates is 3.0 X 10^3 N/C, what would the electric field strength become if half of the charge were removed from each plate and the separation of the plates were changed from 12 mm to 8 mm? Homework...
  3. R

    Impact Strength (mild steel tubing)

    I need to calculate what percentage increase in impact strength I will get by inserting a 1" OD round tube with .083 wall inside a square 1 3/4" width tube with a .059 wall. Both are mild steel, ERW tubing. Check attached file for diagram. I can find out the tensile strength, if that is...
  4. A

    Magnetic field strength against current

    Homework Statement Hi after doing a experiment at school, I have come up with a graph of magnetic field strength against current. I was wondering if anyone knew what the gradent of this line or area under the line represented? Homework Equations B=KI/R? The Attempt at a Solution...
  5. I

    Exploring Male & Female Differences: Strength, Oxygen, Body Fat & More

    questions to be answered 3.Explain how males and females differ in terms of: (a) Strength? (b) Oxygen transport (c) Body fat? 13. Pulse rate is a measure of aerobic fitness. Why? 15. Describe the effects and benefits of training? 16. Describe the advantages and disadvantages of training...
  6. L

    Relationship between voltage and the strength of an electromagnet?

    What is the relationship between voltage and the strength of an electromagnet?
  7. M

    What is the electric field strength at the center of the triangle?

    Homework Statement What is the electric field strength at the center of the triangle? Three 13.0 -cm-long rods form an equilateral triangle. Two of the rods are charged to + 19.0 nC, the third to - 19.0 nC . What is the electric field strength at the center of the triangle...
  8. D

    Magnetic field strength and SHM

    Homework Statement Hi there.this is one of those proof dealies that i think i nearly have right but i was wondering if anyone could point out if i have made too many assumptions or anything thanks. Show that if a bar magnet is suspended in a uniform magnetic field, of strength H, and is...
  9. K

    Help with Strength of Materials question

    if anyone could provide any insight as to how i go about completing this question i would be grateful, i was off the week this was taught to the group and have no idea whatsoever
  10. R

    Magnetic Strength and Uniform Magnetic Fields Explained

    If a magnet is cut into exactly 2 equal parts , the magnetic strength of this part is half the magnetic strength of the original magnet. Why does it get halved. What is the formula for magnetic strength>? What is meant by uniform magnetic field?
  11. C

    Understanding Strain Invariants in Strength of Materials

    Can anyone help me understand the concept of a "strain invariant" given a strain state matrix? or perhaps point me towards something? thanks for any help.
  12. C

    Confused about electric field strength and PE

    I have just started to learn these things(electric field strength, electric potnential energy and electric potential). I am not very clear about what they are. I would like to ask a few questions here. Why is electric field strength somtimes +ve but sometimes -ve? what does each of them...
  13. R

    Stress at half of tensile strength

    Can you guys solve a debate for me?If you have two objects and apply a physical stress to them, let's say in the forum of pressure. First object: Tensile strength 400 lbs. and you apply 200 lbs Second object: Tensile strength 200 lbs and you apply 100 lbs. So each is under 1/2 it's tensile...
  14. N

    Yang-Mills Field Strength Tensor

    I was wondering why for [tex] F_{\mu \nu} = [D_{\mu},D_{\nu}] = \partial_{\mu}A_{\nu}-\partial_{\nu}A_{\mu}+[A_{\mu},A_{\nu}] [\tex] the term [tex] A_{\mu}\partial_{\nu} - A_{\nu}\partial_{\mu} [\tex] vanishes.
  15. B

    Izod Impact Scale Test: Determining High/Low Strength Values in Joules

    I'm supposed to determine if a bunch of materials have a high or low impact strength. I did the hard part and determined that the impact strength for each material, but I don't know a relative scale. What is a high value on the izod impact scale test(it's measured in joules). Any idea?
  16. U

    Electric Field Strength H Units - Ampere Turns/Meter?

    What are the units of the electric field strength H? I know that H = NI/L for a solenoid and I'm wondering if there is any condensed unit or if it is just ampere turns per meter.
  17. Repetit

    Can Thermal Energy Break a Covalent Bond?

    Hey! I want to estimate the temperature needed to break a covalent bond of strength 1.70 eV. Whould it be correct to compare the thermal energy k_B T to the bond strength and find the temperature needed to make the thermal energy larger than the bond strength? I get a temperature of about...
  18. L

    Yield strength variation with temperature

    anyone can help me out by providing the mathematical relationship between yield strength and temperature
  19. D

    Understanding the Strength of an Electric Field

    Hey. Was just reading through some notes, and found the equation for the strength of an electric field: E = \frac{F}{q} Im a little confused. How can an electric field have a single value that can define its strength, if the force, F, on the test charge, q, is dependant upon the...
  20. Amith2006

    Strength of earth's magnetic field

    1)Where is the strength of earth’s total magnetic field maximum? At the poles, total magnetic field is purely contributed by vertical component and at the equator, the total magnetic field is purely contributed by horizontal component. But I don't know whether the magnitude of the vertical...
  21. A

    Calculating Mass of Steel Ball for Ultimate Strength

    A solid steel ball is hung at the bottom of a steel wire length 2 meters and radius of 1mm. The ultimate strength of steel is 1.1 X 10^9 N/m^2. What is the mass of the biggest ball the wire can bare. This seems like a pretty straight forward question. I am guessing the 2 meter radius doesn't...
  22. C

    Calculating Line Strength to Stop a Salmon

    All right, I am doing my physics homework and I just cannot figure this one out. I have been trying for literally over an hour, so I am running out of ideas. Here it is. The tension at which a fishing line snaps is commonly called the line's “strength.” What minimum strength is needed for a...
  23. E

    Strength Coefficient and Strain-Hardening Exponent

    Here's the problem: A metal is deformed in a tension test into its plastic region. The starting specimen had a gage length = 2.0 in and an area .50 sq. in. At one point in the tensile test, the gage length = 2.5 in and the corresponding engineering stress = 24000 psi; at another point in the...
  24. G

    Magnet's feild strength decrease when it interacts with an object?

    Does a magnet's field strength decrease when it interactes with an object? Say I had a magnet and It pulled on a metal bar with 1 Newton of force then i put another bar by it. would it continue to pull on the first bar with 1 Newton of force?
  25. B

    How Do I Understand and Improve Wireless Antenna Strength?

    Ok. I'm currently trying to understand antenna strength in the wireless cards you find for your computer. Let's say that I have a wireless http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=706706&Sku=D700-2286" with a certain "receiver sensitivity". How exactly do I read...
  26. Astronuc

    High Strength Steel with Corrosion Resistance and High Toughness

    I periodically browse the literature for new products. In the August 2006 issue of Advanced Materials & Process (from ASM International), I found an article on a new high strength steel from Carpenter Technology Corp. (Cartech) Cartech Custom 465 (find it at www.cartech.com) Custom 465...
  27. C

    Carboxyl acid strength and electronegativity How do they relate?

    Carboxyl acid strength and electronegativity... How do they relate?? Here is a question that I had on a recent chem II exam. Which is the strongest acid? A. CH3COOH B. CF3COOH C. CCl3COOH (Cl for chlorine, not Carbon 13) D. CBr3COOH E. CI3COOH I selected choice A because the...
  28. K

    What Is Tensile Strength? | A Physics Novice's Questions

    I am a Physics novice. While reading an article on tensile strength in wikipedia, I began to wonder what force is responsible for keeping the atoms or molecules of something like a rope together. I mean what force would tension on the rope would have to overcome in order to break the rope...
  29. A

    Electric field strength in a square.

    Hi guys, Suppose I have a point O in the centre of the square (of side length X), where the top 2 corners of the square carries a positive charge each and the bottom left corner a negative charge and the bottom right corner a positive charge, what would the magnitude and direction of the...
  30. R

    Strength In Relation To Bone Structure.

    I realize this is related to biology, but I think the question would be better suited to those who study or have studied physics. The question is this: I learned recently that the cavity in bones, actually increases the overall strength of the bone, even though it has less mass than if it were...
  31. E

    Calculating Strength of Hollow Shaft with Notch & Holes

    Hi all, I have a hollow shaft of 2" outside dia to 1.25" inside dia, about 1.5 ft in length.I also have a notch going around the outside periphery of the shaft. The shaft also has 2 holes drilled tranversely through the shaft The shaft will be rotating and will have torsion and probably...
  32. T

    Calculating Torque and Strength of Materials

    Im including a scan of the problem and my work, please let me know if I did this right. Sorry about the sloppy handwriting. http://img244.imageshack.us/img244/6521/strengthsproblem3rk.th.jpg http://img241.imageshack.us/img241/8866/strengthsworkedout1rw.th.jpg
  33. H

    Why fundamental forces change their strength?

    Yeah, same as above, Why do fundamental physical forces change their strength with distance? Shouldn't the force be the same everywhere? Why or Why not? :tongue2: (how do you know, and what did you get the answer from) Thanks,
  34. S

    Grinding Camshafts: Cost & Strength Benefits

    Why are camshafts normally grinded? Is diecasting and then welding camlobes to a shaft too expensive and/or does it give less strength?
  35. H

    Deduce gravitational strength

    Distance form the Earth's surface: Gravitational potential/MJkg-1 0 : -62.72 400000 : -59.12 Deduce the Earth's gravitational field strength at a height...
  36. K

    Dielectric Strength problem.

    Dielectric Strength problem. Please Help! :( If anyone can let me know if I went about this right, I'd appreciate it, as well as any advice. The dielectric strength of an insulating material is the maximum electric field strength to which the material can be subjected without electrical...
  37. S

    Acid Strength and Conjugate Bases

    1. Which Bronsted-Lowry acid has the strongest conjugate base? a. HBr b. HClO4 c. HF d. HI 2. What is the strongest acid among the following? a. HF b. HCl c. HBr d. HI Correct? Thanks.
  38. S

    Calculating Electric Field Strength and Direction at a Given Point

    I've been working on this problem for awhile now, and I cannot seem to grasp it :cry: . In this problem, we are to find the strength and direction of the electric field at the point indicated by the black dot (see image below). How would I go about doing this? Thanks in advance! :biggrin:
  39. D

    Magnets Strength: What Physical Property Determines It?

    If the size of a magnet does not determin its strength, then what physical property does? THANX:smile:
  40. E

    Exploring Pressure on Human Bones and Giant Leg Strength

    Hi Two questions, a) how does pressure (in N/cm^2) on the cross section of a human bone change if the length (i'm assuming the length of the person) would increase 10 times ? b) How big would a giant have to be so it's legs can support a pressure of 1000 N/cm^2 with a cross section area of 8...
  41. Astronuc

    What is maximum magnetic field strength of SC magnet

    Another poster is looking for a 20T magnetic field or better, so I went looking for what has been reported as the maximum field strength for an SC magnetic field to date. However I found some contradicting claims. Is there a refereeing organization or a reputable source from which to...
  42. Pengwuino

    Breaking strength of a piece of material

    Ok so I was wondering something... in which situation, if any, is a piece of material more likely to break in the real world... 1) A piece of rope or wire that is being pulled on by two people in opposite directions. 2) A piece of rope or wire being pulled but the other side is a looped...
  43. S

    Calculate the gravitational field strength

    From the radius (1740 km) and mass (7.36 X 10^22 kg) of the moon, calculate gravitational field strength for this body. g = F/m = F/(7.36X10^22 kg) F = GmM/r^2 = (6.67X10^-11)(7.36X10^22)M/(1740X10^3)^2 What is the big M?
  44. A

    Find the yield strength for an elastomer

    Hey, Just wondering, how would you find the yield strength for an elastomer just from the engineering stress-strain curve. My professor said its complix and different books have different ways of finding it. Any ideas?
  45. S

    Strength and Weakness: Balancing Advantages & Disadvantages for Good Management

    I'm proposing that everything has equal advantages and disadvantages. Good management is having strengths affect critcal spots and weaknesses affect non-critical spots. There are a lot of real-world examples (as politics shows), so I won't go about posting them here. Also no one can know...
  46. Astronuc

    STRENGTH OF MATERIALS (Mech E Tutorial)

    http://physics.uwstout.edu/StatStr/Strength/indexfbt.htm#STATICS%20&%20STRENGTH%20OF%20MATERIAL The above link has become inactive (the author, Robert Foley has apparently retired), but another professor has put the course notes into a pdf...
  47. H

    Optimization: Beam of maximum strength

    first off here is the problem :18. A rectangular beam is cut from a cylindrical log of radius 30 cm. The strength of a beam of width w and height h is proportional to . Find the width and height of the beam of maximum strength. so I have a diagram of it but I am having troubles setting up...
  48. Mk

    After a certain external field strength Diamagnetism can collapse?

    After a certain external field strength can it collapse?
  49. V

    Sound frequency and strength measuring

    Can you please help me with my problem? I need to measure how sound spreads trough foam. To measure it i need one source of sound and one recorder of sound. Ofcourse i need to change frequency and strength of sound to see if there is change in its spreading trough foam. I don't know how to...
  50. Mk

    Maxiumum magnetic field strength

    The maximum theoretical field strength for a neutron star, and therefore for any known phenomenon is 1013 T. Why is there a maximum?
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