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1、第12章“面”的概念DYT101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-1DYT101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-2面的定义面是由一系列的2维面元组成的集合,可用于载荷及边界条件的定义面定义为一个面元集面的几何形状可以是3维的(非平面)面不具有诸如质量,惯性矩
2、及厚度等物理特性,仅具有几何意义。面就是一个面元集面元CFACE具有联结结点和方向6体元在其每个表面上具有一个CFACE4CHEXA示例:5213板壳元具有两个CFACEs!CQUAD4示例:14DYT101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-3面的定义(续)示例:20号面由一系列CFACE组成:SURFACE,20,,SEG,22CFACE,301,22,1296,4CFACE,302
3、,22,1297,4...DYT101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-4面的创建直接用单元创建面:SURFACE,1,,ELEM,10SET1,10,1,THRU,499根据物理特性卡来创建面:SURFACE,2,,PROP,20PID=101SET1,20,101,102,103PID=103PSHELL,101,1,.01PID=102PSHELL,102,2,.01PSHELL,103,1,
4、.01DYT101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-5面的创建(续)根据材料卡来创建面:SURFACE,2,,MAT,30SET1,30,1,2PSHELL,101,1,.01PID=101PID=103PSHELL,102,2,.01PID=102PSHELL,103,1,.01MAT1,1,3E7,,.33,7800.DMATEP,2,7850.,210.E9,0.DYT101,Section1
5、2,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-6面的创建(续)混合法创建面:SURFACE,2,,MAT,30,PROP,20,ELEM,10SET1,30,1SET1,20,102SET1,10,1,THRU,499PSHELL,101,1,.01PSHELL,102,2,.01PSHELL,103,1,.01MAT1,1,3E7,,.33,7800.DYT101,Section12,January2005PAT328,Sec
6、tion3,March2001Copyright2005MSC.SoftwareCorporationS12-7体元上的面面也可以在体元表面上创建用CFACE卡可以把体元上的有关表面定义为面元面号结点组合114322126531584478565734867623示例:面10用2个面元组成1296号单元的4号面被定义为301号CFACE,属于22号面元集,1297号单元的4号面被定义为302号CFACE也属于22号面元集。SURFACE,10,,SEG,22CFACE,301,22,1296,4CFACE,302,22,1297,4DYT
7、101,Section12,January2005PAT328,Section3,March2001Copyright2005MSC.SoftwareCorporationS12-8单元表面“CFACE”的定义因为多数前处理器不支持CFACE卡片,需间接定义。方法如下:•采用CQUAD4和/或CTRIA3单元定义CFACE,将其厚度设为9999.SURFACE,20,,SEG,22PSHELL,22,204,9999.CQUAD,301,22,1296,4CQUAD,302,22,1297,4以上卡片完成的定义功能与以下相同:SURFAC
8、E,20,,SEG,22CFACE,301,22,1296,4CFACE,302,22,1297,4•采用PLOAD4卡片定义CFACE,将其压力值设为9999.SURFACE,