What is Load: Definition and 1000 Discussions

A structural load or structural action is a force, deformation, or acceleration applied to structural elements. A load causes stress, deformation, and displacement in a structure. Structural analysis, a discipline in engineering, analyzes the effects loads on structures and structural elements. Excess load may cause structural failure, so this should be considered and controlled during the design of a structure. Particular mechanical structures—such as aircraft, satellites, rockets, space stations, ships, and submarines—are subject to their own particular structural loads and actions. Engineers often evaluate structural loads based upon published regulations, contracts, or specifications. Accepted technical standards are used for acceptance testing and inspection.

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

    Relationship between load and deflection

    Hi, Below is a very simple answer as to what happens to a beam when it has a load applied. "When a load is applied to a beam, delfection occours. If not much deflection, then object is stiff. Linear relationship." How could i further explain this, or is this simple enough?
  2. V

    How to apply a load that is uneven(non parallel)_

    hi... i need help regarding applying a load that is not parallel(It's like an inverted u shape object applying load but due to it's non parallelity the load that is applied on the object is non uniform) the difference is 1mm between one arm and the other of the inverted u object
  3. F

    Deflection by integration of load equation

    Homework Statement Determine the equation for the deflection curve for the cantilever supported at A with a load given by: q=q0*sin(\pix/L). Homework Equations The Attempt at a Solution I think this is pretty straightforward, but want to be sure. I did a similar problem with a...
  4. W

    Larger wheels make load easiervto move?

    hello everyone.i'm a disabled; by a surprise stroke at 49 forcibly retired54 year old guy who has been able to figure out or understand almost everything related to home construction in my 25 years as home owner having built on 640 sq ft single handedly from the ground up to...
  5. I

    Deriving the load point on equipment base

    Homework Statement Problem is this. I am tasked with deriving a formula or equations that I can then input into an excel format. I am to take an equipment base that has four sides with supports at each of the four corners. I am to find the load that each one will hold base upon the Center of...
  6. N

    Q: Load curves: similarity check-up

    Hi, I have to compare different load curves (electricity), eg. curves 2-20 with a curve 1. Every curve is represented as array of 24 values (hourly values), with no discontinuity (all values are above 0). I have to find which curve 2-20 is most similar to curve 1. I'm using Excel, but other...
  7. O

    Induction Coil powering a load (inductive reactance problem)

    Hello all! I am a student of electrical & electronic engineering, in my final year; for my dissertation, I am exploring the possibility of scavenging energy from a magnetic field in order to power a wireless sensor..I am using a coil of rectangular cross section with a magnetic core occupying...
  8. R

    AC motor load torque calculation

    Hello! Not sure whether it's a right place to post. My question is from a field of electric drives. I can't figure out how to choose an induction motor for a certain load. Load is a simple cylindric flywheel fitted directly on a rotor. Flywheel has a known mass and dimensions. I know...
  9. A

    Wheelbarrow and load advantage (i think)

    Homework Statement A wheelbarrow is holding a mass of 15kg, 35cm from the handle. The fulcrum is located 65cm from the handle. What is the mechanical advantage at the handle? Handle Load Fulcrum _______________============_...
  10. T

    How Does Load Impact Electric Motor Efficiency and Speed?

    Does anybody know of an equation or rule of thumb for power decrease as load increases? As an example an electric golf cart will go say 15mph with one 100lb driver. Put 4, 200lb people in it and it will go much slower, say 9mph. Is there a way to determine what that loss will be other than...
  11. T

    Applied ME: Drag Force Calculation with Load Cells & LabVIEW

    Hello, First time post long time lurker! I've got an interesting project I am working on which involves a few MechE subjects. The overall goal (for now) is to determine the drag force of a cylindrical cone headed object in sand under various pressures. The movement of the cylinder is the tricky...
  12. S

    The average load current,I(dc) and the rms load current,I(rms) ?

    "the average load current,I(dc)" and "the rms load current,I(rms)"? What is the different between "the average load current,I(dc)" and "the rms load current,I(rms)"? I am very confuse with rms and dc >.< same with V(dc) ,V(rms),P(rms), P(dc) ... Help TT
  13. Z

    Calculating vertical load with multiple bodies

    I'm currently writing a vehicle simulator and have constructed a chassis out of physical node bodies that are connected as in the screenshot below. I am trying to work out the normal force at each of the green circles such that if it were suspended by each of the four nodes, the summation of the...
  14. P

    How to find stiffness using load versus defelection curve?

    I know that stiffness is load per unit deflection. I have the load versus deflection curve for a steel plate. Is it possible for me to find the stiffness of the plate? Thank you.
  15. G

    Calculating Power Output with PWM and 1ohm Load

    Hi I have a question to do with using PWM If for example I had a 1ohm load and a voltage supply of 4JC-1, I would get a power draw of 16JS-1, now if I had a duty cycle of say 50% I should get an average power output of 8JS-1. However if i thought of it as having an average current of 2CS-1 and...
  16. B

    Thevenin without removing load resistor

    I'm having trouble with Thevenin models, specifically this question where the V_oc is not given. The problem: Assume an unknown circuit provides the specified current through the load resistors as given below: 100k - 2.3mA 1.2M - 510uA Find a Thevenin model for the unknown circuit. All...
  17. C

    Using Compressed Air to Lift a 400lb Load

    can compressed air be used to lift a load of 400lbs about 30 feet into the air i came up with using an air compressor to route compressed air into 4 small rocket nozzles to lift it off the ground how powerful of an air compressor would i need if i wanted a constant thrust of 500lbs coming...
  18. P

    Ski pole three point bending-calculation of load at yield

    Homework Statement A ski pole is bent(plastic deformation) in three point bending by applying a load 2F perpendicularly to the ski pole. The forces at the end points are of magnitude F. If the pole yields due to plastic deformation at the mid point longitudinal span of the ski pole which is...
  19. P

    Calc. Resultant Increase in Length of 5m Steel Roof Tie Rod Under 80 KN Load

    the question is:- calculate the resultant increase in lenth of a 5m long roof tie rod made of 25mm diameter steel when subject to a tensile load of 80 KN. (assume E=210KM/mm2) does anybody know how to solve this or what the calculation is that i got to use? help apprecited thanks in advance!
  20. G

    How to Calculate Maximum Load for a Cantilevered Beam?

    I have a college HNC engineering question which I am having problems with, I am OK with calculating the I values, and deflection (if needed). But am wondering on what formulae are required and how to use them, to calculate the maximum loading mass in Kg for a cantilevered beam. The question...
  21. K

    Bearing Failure in Motor-Driven Shaft with 40 kW Load

    I have a problem of bearing failure. A motor drives a shaft thro a flat belt. This shaft is connected to a load of around 40 kw. The shaft has 1309 self aligning ball bearing as floating bearing at the back end of shaft. On the load side there is a bearing 2209 NUP. The bearing inners are locked...
  22. G

    Calculating Maximum Load for 6m Timber Beam

    G'day I was wondering if anyone could give me some information to do with the max load a given beam can support. I have done some study in statics but it was along time ago. I am considering a 6 metre distance, spanned by a rectangular timber beam. I was wondering what information other...
  23. A

    Question about centre of mass and load centre of gravity

    Can anyone tell me that if centre of mass and load centre of gravity of a heavy vehicle doesn't concide,what vl be its effect on vehicles acceleration?
  24. J

    Load, elasticity, strain, strength

    Homework Statement A continuous and aligned glass reinforced composite consists of 40 volume % of glass fibers, having modulus of elasticity = 10 X 10^6 psi and 60 volume % of polyester resin that when hardened, displays a modulus of elasticity = 5 X 10^5 psi. a) compute modulus of elasticity...
  25. H

    Critical Load in Buckling problem

    I experimented column buckling analysis with different two load conditions in MSC.Nastran. In the first condition, force was loaded from the downward direction at the top of the column. In the second case, force was inflicted toward horizontal direction. But P[critical] of two cases...
  26. A

    What Could Have Caused an Error in Experimental Buckling Load Calculation?

    Hi, I have a problem with the experimental buckling load that I have deduced for a compressive axial load applied to a tube of circular cross section. The buckling load is 2.34% larger than the theoretical buckling load! The beam is connected to supports via knife edges; these are rigid bodies...
  27. E

    Calculating Voltage of 120V Load 750ft from Source

    Homework Statement What Voltage is delivered to a 120-volt/5000-watt load which is fed with #10 AWG wire (1.24 ohms/1000') and located 750 feet from the 120-volt source? Homework Equations Ohm's Law E= I * R E=(K*I*2*L)/Acmil The Attempt at a Solution I am in an...
  28. K

    Finding Reactionary Forces on a Beam with Distributed Load

    Homework Statement A simple beam is under a distributed load q=c*sine(n*pi*x/L)? if there are two pivots at the end points supporting it, what will be the reactionary force on each one of them? Here, L is the length of the beam and x=0 is the leftmost point. 0\leqx\leqL The figure...
  29. M

    Load Inertia - Mass Moment of Inertia Question

    I'm looking for some help to verify a calcualtion that was made by a previous employee. The calcualtion was for load inetria (reflected to the motor). The motor will be driving (3) rollers at a gear ratio of 3.5:1 (motor turns 3.5 revolutions for every 1 revolution of the rolls). I have a...
  30. B

    Voltage regulation under a capacitive load.

    Homework Statement Why does the voltage regulation of a transformer become negative when a capacitive load is attached? It causes the voltage across the secondary winding to increases rather than decrease, as would be the case for a resistive load. But why? Homework Equations Regulation =...
  31. J

    Definition needed for radiation load

    Urgent! Definition needed for "radiation load" Hi, not really a typical problem, but I have no idea what "radiation load" means and I can't find a definition anywhere. Any help would be great. Thanks!
  32. maverick280857

    How Do You Calculate Line Flows from Load Flow Analysis?

    Hi everyone Suppose I have an n bus system with some initial conditions and a load flow analysis is carried out, which furnishes complex voltages and powers. Now, I need to find the line flows, i.e. the power flowing over every transmission line. If I consider a transmission line from bus...
  33. S

    Inertial load model penetration

    Hi, I have an FEA model where all my parts are bonded contacts (no contact surfaces). I am trying to fix one end of this model and apply inertial load on the other. However the heavy parts are penetrating into the soft ones. How do I avoid this model penetration? Thanks,
  34. H

    Calculating Stiffness of Aluminum Plate with Pressure Load

    Hi all: I am fresh to engineering and have basic question. I have a 100 inch length and 40 inch wide & 6 in depth plate , it has honeycomb structure what I mean 0.125 inch face sheet of aluminum on either side and rest (6-.125*2)is honeycomb made of alumnium.It is supportted on 4...
  35. J

    3-4A too much load for a car battery?

    Hello, So I have put into motion a plan to build an LED array that scrolls letters. I've got the hardware and coded the assembly to make it happen but I have not yet purchased things such as the LED's themselves or op-amps to drive them. I have calculated that the load will be around 3-4A...
  36. S

    UPS Load Problem: Solutions & Recovery

    hi... i would like to know the fact of UPS(uninterruptible power supply) that why sometimes UPS has some problem to satisfy the load and how to recover the problem...
  37. M

    Choosing the Right I Beam for 800lb Load Support

    Since I'm new to this site don't razz me to bad since I suck at any type of mathematical equations. Anyways, I am building a "Jib" arm and was planning on putting an I beam in the ground with concrete. Although the I beam will have to be free standing and about 10' tall. The "jib" arm...
  38. D

    What is the maximum load capacity for my fabricated bracket?

    Hi Guys I hope you can help. I’m currently trying to modify some existing equipment and have a problem that I hope you good people can help me solve. I have a fabricated bracket that currently supports another bracket than runs on linear bearings to position its self. see attached JPG for...
  39. A

    Calculating Bolt Proof Load

    Hi, What is Proof load of a bolt? I need to calculate the proof load of a bolt? I have searched the net but could not find it. Please help me. Thanks, Ana
  40. W

    Pulsing high current into capacitive load?

    I have to pulse 80 Amps @ 1 KHz into a capacitive load of a few uF. Unfortunately the RC constant is high enough that it prevents the next pulse to start from 0 amps. So in a sense the pulse generator delivers about 70 to 80 amps per cycle instead of 0 to 80 amps like it would in a...
  41. C

    Maximum Load for C Hook | Calculate C Hook Load

    "C" hook maximum load. Hi, It´s been quite a while since the last time that I had to solve a classic statics load problem (about 20 years ago). Here is my problem: I have a simple "C" type hook (please refer to attachment "Gancho.jpg") made of 25.4 (1 inch) diameter commercial steel...
  42. D

    Stiffness matrix / load vector calculation

    Homework Statement Problem is (to be solved in software, this is actually a programming assignment): -\triangle u = f on \Omega = (0,1)^2 u = 0 on \delta\Omega And f = 2x(1-x)+2y(1-y) And the exact solution known to be u(x,y) = x(1-x)y(1-y) Okay, so the actual assignment is about...
  43. G

    Load bearing structure made of matchsticks

    Homework Statement Ok, i have a small (optional) project, to design a load bearing structure made of matchsticks. The structure must be able to withstand the load a computer monitor (i have a 17" one). Homework Equations Now, the problem i am facing is how would the force (of gravity due to...
  44. D

    Path of shear stress over one load cycle

    Homework Statement normal tension [MPa], shear tension [MPa], equivalent tension [MPa], deformation [%], number of cycles until failure all this are given for a lot of specimen of the same material Homework Equations \sigma_\theta, \tau_\theta The Attempt at a Solution Find...
  45. A

    Work and Heat in Gas Cycle (formatted: may load slowly)

    Problem: One (1.00) mole of an ideal diatomic gas (with = 1.40) initially at 20.6°C and 1.00 atm pressure is taken around the following cycle: Path (1): an isochoric increase in pressure until the temperature of the gas is 159°C and the pressure is P; Path (2): an adiabatic expansion until...
  46. B

    Braking calculations while going down a slope pullling a load

    I'm trying to find out how to see if my brakes will lock up or my tires will continue to roll through the following scenario. I have a machine that weighs 42,000 lbs. I'm pulling a 110,00 lbs trailer with load (no brakes on the trailer). This is a rubber tired machine going down a 8 degree...
  47. Chandra214

    Ripple increase on higher load: at rectified output: 18Vac to 25.5Vdc

    Hello All, glad to be a part of this elite community, i have been following the forum threads for quite few days now, i am really interested to hear from Mr.Berkeman. here is my problem: we are facing a problem at the rectified output of our power supply, we have used a bridge rectifier to...
  48. N

    Voltage Divider Bias Under Load

    Hey, I'm kinda stuck in this odd question. I've tried searching on the Internet but haven't found much help. Basically, I have a voltage divider biased transistor. I can solve and find its Q-point without an external load, but I'm kinda confused how the circuit will change when there is an...
  49. T

    What is the maximum load on square tubing?

    Can anyone help to determine the maximum load on 3.5 " x 3.5 " x 3\16 " square tubing with a 1 " adjustable pin hole. This tubing was inside a 4 " x 4 " support . See the attached picture. I need to know the load or force allowable on the 1 " pin prior to the 3.5 " x 3.5 " tearing from the...
  50. L

    What Is the Maximum Compressive Load on a Solid Brick Pier?

    can someone give me the defination of compressive load so i can work out a question which involves solid brick pier having :... ...325mm square section, and 2.4m height, subjected to an axial load of 400kN LF
Back
Top