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x z =Z y i j l k 1 = 4 = 2 = 3 = ? =1 ? =1 ? =1 ? =0 ? = constant P Q R 湖南大學機械與運載工程學院 College of Mechanical amp。 Vehicle Engineering, Hunan University 2021/11/12 四面體常應變單元 0)()(223223???????PPPzyyyyxxxx??0)()()()()()(11223111122311?????????????????BPBPBzyyyyyyyyyxxxxxxxxx????????4321214444321214444)1()()()()()()()()(zzyyyyyyyyyyyxxxxxxxxxxxBB???????????????????????????????????1234(1 )(1 )(1 )NNNN???? ???????????? z x z =Z y i j l k 1 = 4 = 2 = 3 = ? =0 ? =0 ? =1 ? =1 ? =0 ? =1 ? =1 ? =1 ? =1 ? =0 ? =con stant P [ x P ? ? ( x 3 ? x 2 ) +x 2 , y P ? ? ( y 3 ? y 2 ) +y 2 ,0 ] O B B [ x B ? ? ( x P ?? x 1 ) +x 1 , y B ? ? [ ? ( y P ? y 1 ) ? y 1 ],0 ] O [ x =( 1 ? ? )( x 4 ? x B ) ? x B , ? y =( 1 ? ? )( y 4 ? y B ) ? y B , z =( 1 ? ? ) z 4 ] ? =con stant ? =con stant 湖南大學機械與運載工程學院 College of Mechanical amp。 Vehicle Engineering, Hunan University 2021/11/12 四面體常應變單元 Jacobian: ??????????????????????????????????????????????zyxzyxzyxJ243121413131213121413131216 0 0 ]d e t [ ??????????????????Vzyyyyyyxxxxxx???????????J111000d d e t d d deTTeVV? ? ? ? ???? ? ? ?m N N N N [ J ]1 1 1 2 1 3 1 4111 2 1 2 2 2 3 2 420003 1 3 2 3 3 3 44 1 4 2 4 3 4 46 d d dee V ? ?? ? ? ????????????????N N N NN N N NmN N N NN N N N湖南大學機械與運載工程學院 College of Mechanical amp。 Vehicle Engineering, Hunan University 2021/11/12 六面體單元 P P’ P’’ P’’’ 湖南大學機械與運載工程學院 College of Mechanical amp。 Vehicle Engineering, Hunan University 2021/11/12 六面體單元 ? 形函數 eNdU ?12345678displ a c e m e nt c om pon e nts a t node 1displ a c e m e nt c om pon e nts a t node 2displ a c e m e nt c om pon e nts a t node 3displ a c e m e nt c om pon e nts a t node 4displ a c e m e nt c oeeeeeeeee????????????? ??????????????ddddddddd m pon e nts a t node 5displ a c e m e nt c om pon e nts a t node 6displ a c e m e nt c om pon e nts a t node 7displ a c e m e nt c om pon e nts a t node 8111 ( 1 , 2 , , 8 ) eiuviw????????????d1 7 5 8 6 4 2 0 z y x 3 0 fsz fsy fsx ? ?87654321 NNNNNNNNN ?)8,2,1(