tailieunhanh - dohrmann Episode 1 Part 4

Tham khảo tài liệu 'dohrmann episode 1 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1. Introduction A family of uniform strain elements was recently introduced that includes a six-node triangle eight-node tetrahedron and ten-node tetrahedron 1 . Although computationally efficient each of these element types can only approximate a single uniform state of strain. As a consequence the elements have several zero energy hourglass modes that must be controlled. The number of hourglass modes for the six-node triangle eight-node tetrahedron and ten-node tetrahedron is six twelve and eighteen respectively. The purpose of this study is to investigate specific enhancements to improve the accuracy of the uniform strain elements of Ref. 1. By adding an internal center node to each element type it is possible to geometrically decompose the triangle into three quadrilaterals and the tetrahedra into four hexahedra. Within each of the quadrilateral or hexahedral domains the element formulations are based on the standard uniform strain approach 2 . Element formulations for the nine-node tetrahedron and eleven-node tetrahedron also include a set of kinematic constraints. The present approach is motivated by the idea that the accuracy of uniform strain elements may be improved by allowing more than a single state of uniform strain. Based on this idea clear improvements in element accuracy are demonstrated for the seven-node triangle and eleven-node tetrahedron. In addition allowing multiple states of uniform strain leads to reduced numbers of hourglass modes. The number of hourglass modes for the sevennode triangle nine-node tetrahedron and eleven-node tetrahedron is two three and three respectively. The enhanced elements can be viewed as the union of uniform strain elements with certain nodes subject to kinematic constraints. Virtual nodes are introduced in the element formulations for the tetrahedra to permit the geometric decompositions described above. Movement of the virtual nodes is constrained to the vertex and mid-edge nodes of the parent elements. For .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.