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. T

    Gravitational field strength of a mass

    A 20 kg mass is situated 4m above the Earth's surface Taking g as 10 m/s2. What are the gravitational field strength and gravitational force acting on the mass? Am I wrong when I say that because the height of the mass ( which is 4m) is too little comparing with the radius of the Earth so that...
  2. P

    Electromagnetic Coil Strength from Moving Liquids?

    I was reading about drift velocity and according to http://amasci.com/miscon/speed.html 100VDC at 1A moving through ~12 AWG wire would produce an electron velocity of 8.4 cm/hr. Since that is incredibly slow I'm curious if a charged fluid (something like the oil used in an oil-based van de...
  3. C

    Solid solution hardening, concentration dependence

    When you add impurity atoms to a material, the yield strength often increases by a process known as solid solution hardening. This is because the impurity atoms create a barrier to dislocation motion. The literature describing this phenomenon dates back to the 1960s with some famous papers by...
  4. T

    Tensile Strength & Bending Stress of Metal Sheet

    Dear Friends, Merry Christmas to All. I am pleased to join this forum of Physics Experts. Please advise what is difference between tensile Strength and Bending Stress of Metal Sheets (Generally below 3.00mm and lighter). I very often encounter with cracking of steel sheets while bending in...
  5. W

    Strongest compressive strength material

    Hi guys, Would like to know what's the highest compressive strength ever measured in any material, and what material that might be. Specifically wondering if there are any materials with gigapascal-level compressive strengths. Thanks! Rgds, Wally
  6. 1350-F

    Brittle Materials: Bending Yield Strength

    It seems to me that the ultimate strength of a brittle material can be easily determined by a bending test, but what about the yield? In the brittle regime, I can see how you couldn't, since the sample would fail before it would flow significantly. However, brittle materials can be made to flow...
  7. D

    Could Earth's Early Magnetic Field Have Trapped Hydrogen in the Atmosphere?

    could Earth's early magnetic field have been strong enough to trap hydrogen within the atmosphere?
  8. A

    Group 6 Acid Strength: H2O vs. H2S vs. H2Se vs. H2Te

    Homework Statement What is the strongest acid among the following: H2O, H2S, H2Se, H2Te 2. The attempt at a solution I noticed they are in the same group so I think the idea is to pick the compound with the group 6 element that is largest in atomic size...I think it's H2Te because atomic size...
  9. P

    Can Different Electrodes Affect Air's Dielectric Strength Values?

    Hi, Am I correct in thinking that for a medium such as air, the dielectric strength is a property of the material and as such has a single value for that material? The reason I ask is because I have been testing the breakdown of air between different types of electrodes and because the...
  10. L

    Impact strength of various thermoplastics

    How does TPU compare to other thermoplastics in regards to impact strength? How does the impact strength of PU vary depending on its form?
  11. P

    Does acidity and hydrogen bond strength go hand in hand?

    More acidity means more electronegativity, and more electronegativity means more dipole moments. I observed that liquids with low dipole moments (bases) often have lower density and surface tension, but not necessarily hydrogen bonds. To contradict it, acetic acid have a low surface tension but...
  12. P

    Surface tension vs Average Bond Strength

    If you increase the surface tension of a liquid, does it change the average bond strength of the liquid?
  13. P

    Hydrogen Bond Strength: Strengthen & Weaken in Water

    How do you strengthen and weaken hydrogen bonds in water aside from changing its temperature? Could you add any solutes to do so?
  14. K

    Upper Limit of EM-Field Strength

    Hello! Which are the highest theoretically possible electric and magnetic vacuum field strengths E and H? How are they calculated?
  15. G

    Calculating strength of steel square tubing

    Hello, I'm enrolled in College in the civil engineering program and am looking for guidance with calculating strength of steel square tubing. We are making a project that has parameters. 1- Must be made of steel 2- 4"x6"x36" is maximum OD of section. 3- 14 lbs is maximum weight 4- the load...
  16. N

    Load strength of schedule 40 1 1/2 in pipe

    I am attempting to create a "lever" to lift the front of a 14ft 85lb Kayak up 7ft, then manually slide the Kayak to a rail, and then use the lever to lift the back of the kayak to another 7ft high rail on a truck. I decided to attempt this with PVC sections, creating an "L" the vertical shaft...
  17. pyman999

    What is the mistake in my calculation for gravitational field strength?

    Homework Statement Homework Equations g = GM / r^2, where g is the gravitational field strength, G is the gravitational constant, M is the mass of the attracting body, r is the radius of the attracting body. p = M / v, where p is density and v is the volume. Vs = 4/3 * pi * r^3, where Vs is...
  18. GreenAce92

    Variable strength electric motor

    The title may seem dumb because increase in voltage but I wanted to have sort of like a transmission for an electric motor which again... increase in voltage which may make this idea unnecessary but I wanted to have a motor that was built like a cone within a cone so that you could slide the...
  19. B

    How to show the inverse square law from a data set

    Homework Statement Hi there! I have a data set of r (independent variable) and E (electric field strength) (dependent variable). The question asks for a non graphical method to show if there is an inverse square law relationship between the two data sets. -- My attempt: I picked the equation...
  20. A

    Ultimate Tensile strength of ductile materials

    In case of ductile materials we know that there is a substantial difference between the ultimate tensile strength and yield strength. As long as the specimen stress is below the yield strength we need not worry about engineering stress and true stress, as they as essentially same. But when...
  21. Natanijel

    WiFi Signal Strength and Computer Orientation

    Hello everybody :) This is my first post! I have a mystery about radio communication that I was wondering about for a long time: If I have understood correctly, most computers have a single WiFi antenna in the shape of a rod, which is placed in a particular orientation. My question is this...
  22. K

    Can Electric Field Strength describe the Electric Field?

    We have two difference electric fields A and B. We are standing at point W1 in field A and the potential at a point M1 which is 0.5 meter left is 10 volts while the potential at point M2, which is 0.5 meter right, is 5volts. The potential difference between M1 and M2 is 5volts and the strength...
  23. D

    Relationship between magnetic field strength and voltage

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  24. B

    Solving for Electric Field Strength

    Homework Statement An electric dipole is formed from 1.0 nC charges spaced 2.4 mm apart. The dipole is at the origin, oriented along they-axis. What is the electric field strength at the following points? a. (x, y) = (10 cm, 0 cm) b. (x, y) = (0 cm, 10 cm)Homework Equations Pythagorean Theorem...
  25. N

    Finding yield strength with modulus of elasticity

    Homework Statement Grade 1020 Steel has a yield strength of 42ksi and E modulus of 30 mpsi. Another grade of steel has yield strength 132 ksi. What is its E modulus? Homework Equations E=FL/EA This is the equation i should be using to find e modulus I thing The Attempt at a Solution I don't...
  26. S

    Net Electric Field Strength at a Point due to a Uniform Electric Field

    Homework Statement A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 3600 N/C and is directed in the positive x direction. A point charge -9.8 × 10-9 C is placed at the origin. Find the magnitude of the net electric field at y = +0.20...
  27. J

    Homework, electric field strength at centre of a square

    Homework Statement 4 charges of +5µC, +3µC, -4µC and +2µC form the 4 points of a square of side length 2m. Calculate the field strength and potential at the centre of the square. Homework Equations F=1/4πhttp://upload.wikimedia.org/math/d/3/c/d3c305fc416b971cd6d284564e51bf85.png0 X Q1Q2/r2 E=...
  28. M

    Angle of support and strength capability

    I have been looking at new weight benches recently. Whilst I can appreciate this is not a weights training forum I think the mechanical loads and the equipment designs can best be discussed here, I´d like an engineers professional input. Something that's rather obvious is that as benches get...
  29. J

    Concrete Compressive Strength

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  30. A

    Steel Box Section strength for climbing wall

    Hi, I'm planning to build a climbing wall outside my house, attached to a concrete wall. The climbing wall would be 3 sheets of 18mm plywood (each about 30kgs) - each 2.5m x 1.22m (8ft x 4ft). With the boards set out 2.5m wide and stacked 3 high to give a max height of 3.66m (12ft). I want the...
  31. M

    Strength Testing Welded Steel Tubing and Bolts for a Weight Lifting Bench

    I had a piece of box section steel tubing, 400mm long, 5 x 10cm section, 3mm thick. It has a foot welded to the bottom which stabilises it at the floor (this is in red). It is a weight lifting bench. I needed to shorten the length, so I cut it in two and overlapped a join, then fixed it with 3...
  32. C

    Magnetic Field Strength Vs. Angle of direction

    I have a simple question... does the magnetic field angle of direction vary when you vary the field strength? For example, say i have a magnetoresistive sensor, which, to my knowledge only detects the magnetic field angle of direction (unlike a halls, which senses field strength). I place...
  33. J

    "Strength" of magnets: is there really such a thing?

    Ever get a simple question that leads you down a rabbit hole? A friend of mine asked me "how much stronger are rare Earth magnets than regular iron magnets", and I was given pause for thought, since I realized that I didn't really know much about how the relative "strength" of magnets are...
  34. S

    Surface Area and electric field strength

    This is my first post but I have frequented the forum for a little while now. I tried to figure things out myself and often times I am lead here by google. So my question is this: How is the electric field of an object altered when the surface area of the object is altered? Example: Take a...
  35. P

    Electric field strength from two charges

    Homework Statement Two identical point charges, q1 = +2.5 x 10-6 C and q2 = +2.5 x 10-6 C, are placed as shown in the diagram below. Point P is a distance 0.05 m from q1 and 0.12 m from q2, such that the angle at P is 90 degrees. Calculate the magnitude of the Electric field E at point P...
  36. S

    Strength (mostly axial)of square steel tubing

    I am designing a Power Rack like this. Would I benefit anyhow using 3"x3" tubing instead of 2"x2" tubing? The most weight that thing is going to be subjected to is around 800 lbs (400 kg approx). Also will bolting the pieces be dangerous or should I just weld them? Finally I also want to omit...
  37. Daaavde

    Difference between coupling constant and strength parameter

    Hello to everyone, I got a little bit confused between the coupling constant g_W and the strength parameter \alpha_W in the weak interaction. For what I know they should both give an idea of the strength of the interaction but I miss to understand what's the difference between them.
  38. Chacabucogod

    What is the Elastic Contraction of a Propeller Shaft at Full Power?

    A propeller shaft in the largest and most powerful ships transmits about 50,000 hp (1HP=33,000 ft*lb/min). Assume that the propeller transforms this power into a forward push on the ship with an efficiency of 70 per cent and that the ship's speed then is 30 knots (1 knot is 6,080 ft/hr). The...
  39. C

    Steel Strength Chart | A36 Square Tubing Tension Strengths

    Hi All, I am looking for a chart with A36 square tubing strengths. I am mostly concerned with tension strength but yield and other values might come in handy later. Thanks for you input, Chris
  40. N

    How does a dielectric increase maximum electric field strength?

    Homework Statement How does a dielectric increase maximum electric field strength? From the two cases where a dielectric is inserted into a charged capacitor after it is disconnected and after it is remained connected it seems that E will either decrease or stay the same. But I read in...
  41. A

    Electric field strength at the center of an equilateral triangle

    Homework Statement 3 rods each of length 1 meter form an equilateral triangle. Two rods have a uniform charge distribution of 8\times 10^{-6} C and the third of -8\times 10^{-6} C. What is the electric field strength at the center of an equilateral triangle Homework Equations \vec{E} =...
  42. Z

    What is the peak strength of the Electric Field

    In an EM wave traveling west, the B field oscillates vertically and has a frequency of 80.0kHz and an rms strength of 7.75 × 10−9T. What is the peak strength of the Electric Field. So I worked this problem and got it wrong earlier and am looking for explanation as to why. To Solve this...
  43. R

    Concerning differentials in electric field strength calculations

    Hi guys, first time posting here, but I have a question that I have been thinking about for quite a while, and I hope someone can help out with it. Assume a line of charge (with overall charge of +Q and of length L) that is lying on the x-axis. You want to calculate the electric field strength...
  44. J

    Magnetic field strength that emits waves

    Homework Statement The microwaves in a microwave oven are produced in a special tube called a magnetron. The electrons orbit the magnetic field at 2.99GHz, and as they do so they emit 2.99GHz electromagnetic waves. What is the magnetic field strength? Homework Equations ƒ=qβ/(2Pi*m) Thus...
  45. M

    Decreasing strength of magnet by weights

    Hi all I've been trying to use weights, springs and elastic bands to basically decrease the bonding of a piece of metal and magnet. Basically what I am trying to achieve is as the magnet attracts the metal i want the attraction to weighed down consistently, but I am failing to do this as the...
  46. J

    Magnetic field strength and magnetic flux

    Hi, please could someone help with my confusion over these two qauntities. In class we recently learned that magnetic field strength (B) is the number of flux lines (measured in Webers) per square metre. The magnetic flux on the other hand is the total number of flux lines (measured in Webers)...
  47. E

    Help finding the electric feild strength in a uniform E-field

    Homework Statement The voltage across a membrane forming a cell wall is 78.7 mV and the membrane is 8.52 nm thick. What is the electric field strength? (The value is surprisingly large, but correct.) You may assume a uniform E-field. Homework Equations E=-Vd The Attempt at a Solution...
  48. Quarlep

    Gravitational Field Strength due to a Uniform Rod

    I am trying to learn Physics an dI am reading a booK about classical mechanics.I a stuck somewhere in there If you know a gravitational force to a uniform rod I saw there a x and dx Why we need them ? Thanks!
  49. S

    Webassign Find Strength of Magnetic Field using Java App

    Homework Statement A 10nC, 1µg particle is fired into a magnetic field as shown. Distances are in millimeters, time is in seconds. What is the strength of the field? (See my picture for additional information and my worked solution) Homework Equations f= mv^2 /r F(from B field) =...
  50. B

    What is the net electric field at point P in this physics problem?

    Physics Problem , please help I'm writing a test tomorrow and want to know if I'm right. The Question : Two point charges Q1 and Q2 are spaced 3m apart. Q1's charge = 14C Q2's charge = +20 C *Q1 -------(3meters)------- *Q2 ----(2meters)---- *P Calculate the net electric field at...
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