Finite Elements Flashcards
What are typical 1D elements
A) BAR elements, for the modelling of struts, geotextile reinforcement etc (2DOF)
B) BEAM elements, retaining walls, tunnel linings etc (3DOF)
What are typical 2D elements
A) triangles and quadrilaterals for soil and structural modelling
B) Slip elements for SSI behaviour
What are typical 3D elements?
Hexahedrons and tetrahedrons for soil and structural modelling
The order of the element is determined by ______
The order of the polynomial used as the shape function
constant strain is ______ order
1st
Linear strain elements are _____ order
2nd
Cubic-strain elements are ____ order
4th
will have interior nodes
When do you use infinite elements
To model an unbounded area-finite radius then down to infinity.
Be able to sketch
When are interface elements used
At soil/structure regions where progressive slip may occur
For retaining walls
sketch-long flat rectangle with a L»thickness
What is a homogenous material
The properties are not spatially dependent
What is a heterogenous material
The properties are spatially dependent e.g. Concrete
What is an isotropic material?
A material whos properties do not exhibit a direction sensitivity
What is an anisotropic material
Material has one or more properties that is direction-dependent
What order is a linear displacement triangle?
1st??? THIS NEEDS CHECKING IM CONFUSED
