Beam element vs. Finite element?

In summary, the conversation discusses the use of beam elements and finite elements in structural analysis. It is explained that a beam element is a type of finite element and the choice of element depends on the model and load conditions. Some recommended resources for learning about finite element analysis are provided, including books and online links.
  • #1
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13
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Hello,

am a bit confused when to use

beam element and when to use Finite element?

is the beam element a subset of Finite element?
 
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  • #2
A beam element is a type of finite element. There are a lot of different element types. The three most basic elements are a spring element, truss element and a beam element. The type of element to be used depends on the model and the degrees of freedom that each have at their respective nodes. In other words, the type of element to use depends heavily on your load conditions and what your geometry is.
 
  • #3
Thanks for your swift reply ;)

do you recommend any book, or link online?
 
  • #4
Any FEA book will give you the basics behind the theory:
http://www.colorado.edu/engineering/CAS/courses.d/IFEM.d/
Note chapters 11 and 12 in the link above.

http://illustrations.marin.ntnu.no/structures/analysis/FEM/theory/index.html
http://en.wikipedia.org/wiki/Finite_element_method_in_structural_mechanics

http://www.sv.vt.edu/classes/MSE2094_NoteBook/97ClassProj/num/widas/history.html [Broken]
http://www.sv.vt.edu/classes/MSE2094_NoteBook/97ClassProj/num/midkiff/theory.html [Broken]

http://courses.cit.cornell.edu/ansys/ [Broken]
 
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1. What is the difference between a beam element and a finite element?

A beam element is a simplified model used to represent a beam structure, while a finite element is a more generalized model used to represent any type of structure. A beam element only considers the bending and axial behavior of a beam, while a finite element takes into account other types of behavior such as shear and torsion.

2. Which one is more accurate, a beam element or a finite element?

It depends on the specific application and the level of detail required. In general, a finite element is more accurate as it takes into account more behaviors, but it also requires more computational resources. A beam element is a good approximation for simple beam structures, but may not be accurate enough for more complex structures.

3. Can a beam element be used to analyze any type of structure?

No, a beam element can only be used for structures that can be idealized as beams. This means that the structure must have a length much greater than its width and height, and its behavior is primarily determined by bending and axial forces.

4. What are the advantages of using a finite element over a beam element?

The main advantage of using a finite element is its ability to model various types of behavior, making it more versatile for different types of structures. It also allows for more accurate results and can handle more complex geometries. Additionally, finite element analysis can provide more detailed information such as stress and strain distributions.

5. Can a beam element and a finite element be used together in an analysis?

Yes, it is common to use both types of elements in an analysis. A beam element can be used to model simple beam structures, while finite elements can be used for more complex areas such as connections or support conditions. This approach allows for a more efficient and accurate analysis of a structure.

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