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. RoboNerd

    Question about strength of magnetic field down coil (solenoid)

    Homework Statement Hi everyone. I was reading through a book and came across the following question and explanation: " You are given two 200 meter strands of identical copper wire. With one strand you create a coil whose radius is 2 cm. With the second strand you create a 4 cm coil. Assuming...
  2. Zack K

    Gravitational field strength at a point

    Homework Statement What is the gravitational field strength at a point 6.38x106 m above the Earth's surface? Homework Equations The Attempt at a Solution Ok so I plug in all the known variables. G= 6.67x10-11. M= 5.98x1024. r= 6.38x106 and so I multiply that by 2 because the given point is...
  3. Quantum321

    B Why should the four forces be equal in strength?

    Physicists believe at one time there was only one force. As the BB cooled the four forces we know today are derived from that one force. Why must the four forces all be equal?
  4. TheAnt

    How is the strength of a magnetic field measured?

    I was wondering at what point the strength of the magnetic of a magnet was mea. I assume it would not be the origin of the field which would be inside the magnet and not the side of the magnet itself as the value would be dependant of the size of the magnet. Is there a standard of where to...
  5. petrushkagoogol

    I Field strength variation of different types of fields

    The field strength of gravitational, electric and magnetic fields vary as the inverse square of the distance from the source. Is this because all of the above fields are generated by fermions and they behave identically regardless of the nature of the fields ? Do the above fermions have rest...
  6. A

    Calculating Magnetic Pole Strength: Guide to Theory & Experiment

    Ok, I've spent lots of hours browsing the web and the library and still this question is burning. How can i calculate, whether it be experimentally or theoretically, the " pole strength" of a magnet. (I have read about the experiment where you divide the work it takes to turn a magnet around a...
  7. George Zucas

    Lifeline Rope Strength Analysis

    Hello everybody, I am trying to analyse the lifelines we use at work, though the results I obtain are causing me headaches. The problem is, our workers often install and use what I would call homemade lifelines. My boss asked me to check whether what they do is reliable. According to what I...
  8. P

    Schools How to know a graduate program's strength?

    So, I've heard that rankings do matter if you want to go to academia; however, I've also heard that a PhD from the University of Hawaii in observational astronomy will be more valuable than one from MIT. So, where can I find universities' rankings by program (for example, cosmology or...
  9. H

    B Gravitational field strength calculation

    In what scenarios would you use the equation g= F/m instead of g=GM/r2 (or vice versa), for calculating gravitational field strength? Update: is g=F/m used to find the force acting on a mass in a gravitational field (of strength g), whereas g=GM/r2 used to calculate the gravitational field...
  10. TonyL

    Distance and material affects on magnetic full strength

    Hi Folks: This is my first post, I hope that I observing the proper etiquette. If I have a magnet with a known pull strength is there a way for me to determine the affect of 1/4 inch plywood on the magnets pull strength when the plywood is placed between the magnet and the surface metal? Thank...
  11. 1

    Why does the point experience NEGATIVE field strength?

    Hi, i'm looking for an explanation to this answer of a past paper that I'm doing, it's from OCR (A level) G485, question 1 b ii) the question on top, and answer on bottom i don't understand why would the point experience a negative electric field strength when it's getting closer to a...
  12. C

    Electric field strength at a point between charges

    Homework Statement A +1.0 μC charge is placed at point X. A +4.0 μC charge is placed at point Y, 50 cm from X. How far from X, on the line XY, is the point where the electric field strength is zero? Homework Equations E = Q/4πε0r2 The Attempt at a Solution I know that the electric field is...
  13. RobertColman

    How can I derive a formula for change in B field strength?

    I'm a bit stuck on this question (which is homework so hints are more welcome than outright answers). The question is: A very long wire carrying a current I is moving with speed v towards a small circular wire loop of radius r. The long wire is in the plane of the loop and is too long to be...
  14. ChrisVer

    A Signal strength parameter (interpretation)

    How can in general the signal strength parameter ##\mu## be interpreted? I am talking for the parameter defined in Eq.1 here and plots like the Fig.1 here: http://arxiv.org/abs/1507.04548 It says that it's the ratio of the i->H->f of the observed over what's expected by the SM... is the last...
  15. Titan97

    Volume strength of H2O2 using iodometric titration

    Homework Statement To a 25ml H2O2 solution, excess acidified solution of potassium iodide is added. The libereated iodine required 20ml of 0.3N sodium thiosulphate solution. Calculate the volume strength of H2O2. Homework Equations Normality = n-factor × Molarity Volume strength = Molarity ×...
  16. S

    Magnetic field strength for circular loop

    When deriving the magnetic field strength due to a circular loop at some distance away from it's center (using Biot-Savart's law), why is the angle between ds and r 90 degrees? This is a youtube video with the derivation, see 5:55
  17. J

    Electric field strength in metal sphere

    1. Homework Statement Why is there no electric field strength in a metal sphere? Is it because the sum of the individial electric field strength of the charges in the sphere is zero? How is that possible? Homework EquationsThe Attempt at a Solution
  18. F

    I Thin Rods Bend Better: Exploring Strength & Flexibility

    Suggest why a thin rod can bend more than thick rod without breaking
  19. W

    How to Choose the Right Materials for a Cost-Effective Compost Tumbler Design?

    Yesterday, I made a thread about creating gears in Inventor. I successfully created them, but now I have a few questions regarding material strength. Background: I am making an autonomously rotating compost tumbler for an engineering class. The design consists of a drum surrounding an axle...
  20. Mohummed Kazmi

    Negative values of magnetic fields strength obtained?

    Homework Statement We were asked to use a Hall probe (in units of Guass) to measure the magnetic field strength in 0.5 cm increments away from a wire carrying 4 A of current. As we got further and further away from the wire our B value got smaller and smaller. Eventually they became negative...
  21. J

    Magnetic fields -- Is the magnetic field through the strength increasing or decreasing?

    So the main reason I'm posting about this problem is that one of the teaching assistants helped me with this problem, but a buddy of mine got something different on part A and part B (Assess). So I wanted to post up here and see what you guys say. 1. Homework Statement The loop in the...
  22. K

    Is this how to attempt this problem on electric field strength

    Homework Statement Two parallel plates at -50kV and 100kV have separation 35cm. a proton is placed between the plates. calculate the electric field strength between the plates Homework Equations E=v/d The Attempt at a Solution 100kV--50kV=150kV 150x10^3/0.35=428571.4N/C
  23. A

    Graphs of Gravitational Potential and Field Strength

    Hi all, I am very confused about the graphs of gravitational potential and gravitational field strength... I know that both gravitational field (g) and electric field strength (E) are negative gradient of their corresponding potential (Vg and Ve). If so, shouldn't g and Vg graph look very much...
  24. S

    Electromagnet magnetic field strength

    Homework Statement Homework Equations ##\oint_{C} Bd\ell = \mu I_{enc}, B_{normal}## continuous across boundary, ##H_{parallel}## continuous across boundary The Attempt at a Solution $$\oint_{C} Bd\ell = \mu I_{enc} \rightarrow B = \frac{\mu NI}{2\pi r}$$ Any help much appreciated. How...
  25. M

    How does curvature of an arch bridge affect its strength?

    Hey, I've been looking into some civil/structural engineering for a school project, and came across bridge design. I've decided to try some integrating and optimising to do with an arch bridge (optimal cost/strength proportions). The math isn't too hard, but what I'm struggling with so far is...
  26. KarminValso1724

    B Why do the 4 forces have the strength that they do?

    For example, why is the strong nuclear force strong enough to hole protons and neutrons together.
  27. Physics Dad

    Electric Field Strength - Assignment Question

    Homework Statement The Nucleus of a helium ion contains two protons approximately 5x10-15m apart. They can be considered to be surrounded by one orbiting electron approximately 5x10-11m away. Calculate the following: a) The electrostatic force between the two protons b) The electrostatic...
  28. C

    Threaded Bolts in Aluminium - Strength Info Needed

    I'm looking for any information about the typical strength for bolts that are threaded into aluminium. I've tried googling them but I'm having hard time finding information; I've tried looking through machinery's handbook and it doesn't seem to be showing the information for this specifically...
  29. henrco

    Find the rms electric field strength of a given EM wave

    Hi, I was able to correctly calculate the answer to part 1 below but the answer to part 2 is incorrect and I cannot see the error of my ways... any help gratefully received. 1. Homework Statement An electromagnetic wave has an intensity of 127 W/m2. 1) Find its rms electric field strength...
  30. K

    Uniform electric field - tension & electric field strength

    Homework Statement A ball with a mass of 3.0 x 10-4 kg hangs from a 15 cm long thread between two parallel plates. The thread is deflected to the side, as shown in the following diagram. The charge on the ball is +5.0 x 10-5 C. a) Find the tension in the thread b) Find the magnitude and...
  31. M

    Metal Tubing Strength and Weight Comparison Chart?

    I'll preface this with saying I'm an Industrial Designer, not an engineer. I also build workshop furniture as a hobby, which this question is in reference to. I'm building a motorcycle lift table. I'm curious, is there a chart that compares things like tubing material, size, strength and...
  32. avito009

    Relation between compression and strength

    Whats the relation between compression and strength? When we build a structure, the ground or the land underneath the structure gets compressed and becomes rock solid. So how does compression make a substance strong? Is a compressed substance having more tensile strength?
  33. Y

    What is the electric field strength inside the capacitor?

    Homework Statement [/B] An electron is launched at a 45∘ angle and a speed of 5.0×10^6 m/s from the positive plate of the parallel-plate capacitor shown in the figure (Figure 1) . The electron lands 4.0 cm away. a) What is the electric field strength inside the capacitor? b) What is the...
  34. A

    Testing the strength of an electromagnet....

    For our physics class we have to design an experiment investigating the factors affecting an electromagnet's field strength. I have decided to investigate the number of coils in the wire. My only problem is, I'm not sure how to measure the field strength. Our teacher gave us two things which we...
  35. C

    Increasing the 1 rep max for strength training

    I am not studying physics so I apologies for my limited knowledge in advance. I felt if I increased speed of reps with sub-maximal weights this increase of speed would increase my 1 rep max using n e=mc2. I'm now not sure as this implies I'm using more energy not applying more force or power...
  36. L

    Strength of material in hollow shaft torque and safety factor

    Homework Statement the tube has ID of 450mm, t= 6mm, OD= 462mm, pressure is 1.2MPa This is based on ASTM A36 steel, which have Ultimate Tensile strength 400-550MPa Yield Tensile strength 250Mpa Modululs of Elasticity 200Gpa Shear Modulus 79.3GPa Determine the factor of...
  37. R

    Break Strength of Net: Falconer's Question

    My question doesn't come from any homework, or from a text, or any course work. I am just curious, but horrible with physics. I am a falconer. I trap hawks and falcons for my hobby, and yes, I have a license for it. We use a trap called a dho gazza, which is a small net suspended by two...
  38. M

    Does diameter of air coil in electromagnet affect strength?

    The title is explanatory. I know that an iron core yields a stronger electromagnet. What if you have an electromagnet with an extremely tiny air coil relative to its volume? Does the small air coil diameter effect the electromagnet?
  39. kostoglotov

    How conductors/resistors affect electric fields?

    Disclaimer: I'm not sure if this is the correct forum. An ideal conductor (ideal = no resistance) is essentially taking the electric field at one terminal and connecting it to the other terminal. Charge moves when it is in an electric field, electric field strength is in Volts per meter, or...
  40. Ecthe

    Rare gases : calculating absorption by oscillator strength

    Hello, I have some papers (I can give references if needed) giving the oscillator strength of rare gases for a given energy bandwidth and from those values, I would like to calculate their absorption in those bandwidth. However, I am a little bit lost in how to do it. I looked a bit around and...
  41. S

    Uncovering the Strength of SEM's Electromagnetic Lenses

    Does anybody happen to know the strength of the electroMAGNETic lenses of a scanning electron microscope? I was thinking of using solenoid coils, which would be enough if I am willing to increase the focal distance, but the lenses on SEM's seem far larger.
  42. A

    Can we apply Friss equation to find field strength at the receiving point....

    Can we apply friss equation to find field strength at the receiving point for space wave propagation?
  43. I

    Can gene structure determine its "strength"?

    Are certain DNA (genetic) strands structurally better build for survival than others? If yes, is there a term for this? For example, is there a specific order of nucleotides that is harder to destroy than another? Or if there is a specific order/combination of nucleotides that would have...
  44. S

    Number density: Initial fluctuation strength and more....

    Dear all, I am trying to understand the physics behind the "number density" formula given by Weinberg. Is there anyone who can explain these parameters to me: 1- "Initial fluctuation strength": \begin{equation} \rho_1= \lim_{t \to 0}\frac{\Delta \rho_M^3}{\bar{\rho}^2_M}\end{equation} However...
  45. A

    Finding the maximum load of a bar from the yield strength

    I have a flat steel bar (30 mm width, 5 mm thick, 1100 mm long). The bar has a load applied in the centre of 100N. the bar is fixed at both ends with a single concentrated load P applied mid-span the maximum yield stress is 250 MPa (250x10^6 Pa) How do I calculate the maximum load the bar can...
  46. H

    Calculate shear strength A36 plate

    I'm trying to build a tank to hold diesel fuel, it will be on skids to lift with a fork lift but I also want to extend the the sides to provide a way to raise the tank from two attachment points on each side. The sides will be 1/4 A36 steel plate and the rest of the tank will be 10 gauge...
  47. Valour549

    Are ductility and strength always opposite?

    1) Is it always true for materials that if its ductility increase, its strength must decrease (and vice versa)? For example, the ductility of FCC > BCC > HCP. So does this entail that the strength of HCP > BBC > FCC? According to my (entry-level) understanding, ductility increases when: -...
  48. Einstein's Cat

    Gravitational Field Strength of 1

    To note this is not for any piece of homework. Anyway, what possible masses and a distance between them are required for there to be a gravitational field strength of 1 Newtons per kilograms, when these figures are put into Newton's equation of F= G (m1 * m2 / r sqaured) Many thanks!
  49. D

    Trying to make sense of the strength to weight ratio

    I need some help with something that seems rather simple, but I don't know how to apply the formula. Let's say I have a table and based on the particular material from which it is constructed, it has a strength to weight ratio of 50 kN·m/kg. If I were to place an object on the table that...
  50. S

    Bending strength of timber and modulus of elasticity.

    I am constructing a glutamine beam as part of a project and need to estimate the load at which the beam fails in bending and the load that will give deflection of length/200. I have been allowed to do a none destructive test on each piece of timber to be used in my beam. This has given me a...
Back
Top