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Answers for “什么是单元形状函数?”

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Element shape functions describe how displacements vary inside a finite element. After the solid is broken into elements and element equations are written, these functions represent the internal variation of displacement within each individual element.

Conditions: Defined within an individual finite element.; Used after discretizing the domain into elements and identifying nodes.

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In finite element modeling, the continuous solid domain is broken down into smaller pieces called elements. Deformation is then computed at selected points called nodes, which are located at the boundaries or specific locations within these elements.

Conditions: Used for discretizing a continuous solid or domain into finite pieces.; Deformation values are associated with selected nodal points.

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The element equation for a chord approximating an arc is 2rsin⁡(θ2)2r\sin\left(\frac{\theta}{2}\right). This formula calculates the length of one straight finite element used to approximate a circular arc segment, derived from basic trigonometry using the radius and the half central angle.

Conditions: The element is modeled as a straight chord of a circle.; rr is the circle radius.; θ\theta is the central angle subtended by the element.

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Discretization error, also called numerical error, is the difference between the circumference of the polygonal approximation (the sum of element lengths) and the true circumference of the original continuous circle. It represents the unavoidable gap introduced when a smooth object is replaced by finite elements.

Conditions: Occurs when a continuous geometry or field is replaced by a finite collection of elements.; In the example, the comparison is between the approximated circle and the original circle.