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A _________ element by using nine-node shape function.

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A _________ element by using nine-node shape function.

(a) Load vector

(b) Sub parametric

(c) Element displacement vector

(d) Constant matrix

The question was posed to me during a job interview.

The origin of the question is Four Node Quadrilateral for Axis Symmetric Problems in chapter Two Dimensional Isoparametric Elements and Numerical Integration of Finite Element Method

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Right answer is (b) Sub parametric

Best explanation: The Nine-Node Biquadratic Quadrilateral This element is often abbreviated to Quad9 in the FEM literature. This element has three types of shape functions, which are associated with corner nodes, midside nodes and center node, respectively.

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