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This command is used to construct an eight-node 3D brick acoustic element object based on a trilinear isoparametric formulation.

element AC3D8 $eleTag $node1 $node2 $node3 $node4 $node5 $node6 $node7 $node8 $matTag

$eleTag unique element object tag
$node1 ..$node8 8 end nodes
$matTag Material Tag of previously defined nD material

For further documentation and figures see attached:pdf

Reference: ABAQUS theory manual. (2.9.1 Coupled acoustic-structural medium analysis)

Code Developed by: Quan Gu, Yichao Gao and Zhijian Qiu