What is Joints: Definition and 68 Discussions

A joint or articulation (or articular surface) is the connection made between bones in the body which link the skeletal system into a functional whole. They are constructed to allow for different degrees and types of movement. Some joints, such as the knee, elbow, and shoulder, are self-lubricating, almost frictionless, and are able to withstand compression and maintain heavy loads while still executing smooth and precise movements. Other joints such as sutures between the bones of the skull permit very little movement (only during birth) in order to protect the brain and the sense organs. The connection between a tooth and the jawbone is also called a joint, and is described as a fibrous joint known as a gomphosis. Joints are classified both structurally and functionally.

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  1. S

    Analysis Of Truss, Method Of Joints.

    Homework Statement Hi so I have the following truss: http://screencast.com/t/BIdagRt5abg and I need to calculate the forces in every member by method of joints The Attempt at a Solution So I got the Reaction forces: F(BG) = 25N and F(AC) = 35N Now I'm not exactually sure what to do...
  2. R

    Bolted flange Joints load calculation

    I'm joining a flange and a cap using 9 bolts with a steel gasket placed in a 'o' ring. To ensure that the joint is leak proof, I need to calculate the load distribution in the area between two bolts for a given torque in the bolt[please refer to the figure, where the lines indicate the area...
  3. P

    Statics question - Method of joints

    The problem is attached. I have to solve for the force in the member BC. The thing I need help with is solving for the two attachments. I already broke it down into the forces and directions, but what do I do with the lower attachment? How do I find the x displacement of point G from E if I'm...
  4. J

    Finding Internal Forces With Joints & Sections

    I have the truss shown, I'm supposed to find the internal force for each of the vertical members...I understand method of joints and method of sections, but can you use both method of joints and sections in the same problem...for example I found Ly=52.5 and Ry=32.5 using moments and summing in...
  5. W

    Determining Ultimate Shear Stress in Glued Joints

    http://s44.photobucket.com/albums/f46/maximus11373/?action=view&current=w-1.jpg&newest=1 An inclined member is braced with a glued block, as shown. The ultimate shear stress in the glued joint is 1050 psi. Determine the dimension X at which the glued joint will fail. I know that...
  6. P

    Finding Stress Concentration Factor K for Chamfered Joints

    Hello, I have a rod of two different diameters and I'm trying to find the stress concentration at the chamfer between the two diameters. I understand how to find the stress concentration factor, K, if the joint was a fillet (using r/d and D/d to find K in the appropriate table). However I can't...
  7. Q_Goest

    What is the maximum mean stress in a bolted joint?

    There's a common belief that for any given bolted joint, the higher the preload, the longer the fatigue life. I’d like to challenge that preconception and suggest that increasing preload above that needed to keep the joint together and acting as a pair is generally a bad thing and results in...
  8. W

    Linear Thermal Expansion: Bridge Joints

    SOLVED Homework Statement A bridge is made with segments of concrete 80 m long (at the original temperature). If the linear expansion coefficient is 1.2 x 10^-5 (1/degrees C), how much spacing is needed to allow for expansion for an increase in temperature of 50 degrees F? Answer in units of...
  9. S

    Problems involving trusses using method of joints

    While solving for problems involving trusses using method of joints, how do i know which member is in compression and which is in tension? any help would be appreciated, this stuff's been bugging me for quite some time thanks and god bless
  10. A

    Method of joints for a truss

    Hi there! Can anyone take me through the method of joints procedure for this truss? I am having trouble working out the reaction forces at the pin at joint A. Is there supposed to be a vertical component to the reaction force as well a a horizontal (seeing as it is a pin)? And if so where...
  11. M

    How do I determine the support reactions in a method of joints truss?

    Hi, I am really stuck here. My problem is with determining the support reactions. I understand that this needs to be done first before working on each truss member. But I don't understand how to determine them. I have read and re-read all my available text and still stuck. The question I...
  12. P

    Seeking method to optimization force distribution among rivet joints

    I have a case where I am trying to find the optimal place to put 3 rivet points (I will maybe even test with 4). The rivet points r subject to a force according to the picture, which vary 360. What I am seeking here is mathematical methods to find the optimal place to put the 3 riverts, so that...
  13. wolram

    Joints and cold wet weather

    Why is it that cold wet weather makes joints stiff and ache, the actual temperature of the joint can not change much can it?
  14. T

    Method of Joints: Bridge Construction Help

    Hey guys... i need help with method of joints... could some one explain to me how to do this. In my projects in engineering class we are constructing bridges and i want to understand what's going on. Any help would be aprreaciated. Excuse my spelling errors pls.
  15. C

    Reaction forces in ball and socket joints

    Hi, I was just wondering in what directions the reaction forces go in ball and socket joints? Are there reactions in the x, y, and z plane or just in 2 of those planes.
  16. M

    Unlocking the Potential of 360 Degree Joints: Exploring the Possibilities

    Hi, I have a question. I know this is way too impossible, but just curious, what could a person do with 360 degree joints (all joints)?
  17. C

    Equilibrium when applied to muscles and joints Help, please

    This seems like it should be easy but I am not sure what to do. Heres the problem: The picture to the problem is here: http://www.webassign.net/giancoli/9-65alt.gif "(a) Calculate the magnitude of the force FM required of the "deltoid" muscle to hold up the outstretched arm shown in Fig. 9-65...
  18. S

    Method of Joints: Struggling to Understand?

    I am struggleing here. Can anyone explain this concept to me? I don't understand how to first find the forces the supports exort and even if I did I don't know I I could proceed. Does anyone know a website that has a non-symetrical triangle that I can re-learn the basics off of. Or if some one...
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