LINK8单元中文说明.doc

LINK8单元中文说明Release 100 Documentation for ANSYSLINK8LINK8 Element DescriptionLINK8单元描述LINK8 is a spar which may be used in a variety of engineering applications. This element can be used to model trusses， sagging cables, links, springs, etc The 3—D spar element is a uniaxial tension-compression element with three degrees of freedom at each node： translations in the nodal x, y， and z directions. As in a pin—jointed structure， no bending of the element is considered. Plasticity， creep, swelling, stress stiffening， and large deflection capabilities are included。

See LINK8 in the ANSYS， Inc Theory Reference for more details about this element See LINK10 for a tension—only/compression-only elementLINK8是一种能应用于多种工程实际的杆单元.单元能被应用于桁架，垂缆，杆件，弹簧等. 这个三维的杆单元只能承受单轴的拉压,单元每个节点上有三个自由度：x，y,和z方向的位移 在销钉式结构中单元不允许有弯曲塑性,蠕变，膨胀，应力刚化，大变形都是允许的在 ANSYS Theory Reference 的14.8中有关于此单元更详细的介绍 关于只能承受拉与压的描述可以参考单元LINK10 Figure 81  LINK8 GeometryLINK8 Input DataLINK8输入数据The geometry， node locations， and the coordinate system for this element are shown in Figure 81： ”LINK8 Geometry" The element is defined by two nodes， the cross-sectional area， an initial strain, and the material properties. The element x-axis is oriented along the length of the element from node I toward node J. The initial strain in the element （ISTRN) is given by Δ/L, where Δ is the difference between the element length， L, (as defined by the I and J node locations） and the zero strain length。

几何形状，节点位置，单元坐标系均由以上Figure 8.1： ”LINK8 Geometry”所示单元由两个节点，截面积，初始应力，材料属性定义.单元的长度上的正方向(x-axis)是从节点I到节点J 单元的初始应力(ISTRN) 由Δ/L求得， Δ是长度变化量， L是不受载时的长度（不变形时的）Element loads are described in Node and Element Loads. Temperatures and fluences may be input as element body loads at the nodes. The node I temperature T（I） defaults to TUNIF The node J temperature T（J） defaults to T（I） Similar defaults occurs for fluence except that zero is used instead of TUNIF单元荷载的描述请见Node and Element Loads 温度和能量密度作为体荷载加在节点上节点I的温度 T（I） 默认为TUNIF.节点J的温度T(J)则默认为T(I)。

在不更改 TUNIF的情况下能量密度的默认情况与上相似A summary of the element input is given in ”LINK8 Input Summary". A general description of element input is given in Element Input在LINK8 Input Summary中有单元的输入的概要描述Element Input中有完整描述LINK8 Input SummaryLINK8输入摘要Nodes 节点I, JDegrees of Freedom 自由度UX, UY, UZReal Constants 实常数AREA — Cross-sectional area 截面积ISTRN - Initial strain 初始应力Material Properties 材料属性EX， ALPX (or CTEX or THSX）， DENS, DAMPSurface Loads 面荷载None 无Body Loads 体荷载Temperatures —-  温度T(I)， T(J)Fluences -—  能量密度FL（I）, FL（J)Special Features 特殊属性Plasticity 塑形Creep蠕变Swelling膨胀Stress stiffening应力刚化Large deflection大变形Birth and death单元生死KEYOPTs 关键点None无LINK8 Output DataLINK8 输出数据The solution output associated with the element is in two forms: 此单元输出有两种形式： · Nodal displacements included in the overall nodal solution· 节点位移和反应包括全部节点的计算。

· Additional element output as shown in Table 81: "LINK8 Element Output Definitions"· 附加输出在Table 8.1： ”LINK8 Element Output Definitions"中Several items are illustrated in Figure 8.2: "LINK8 3—D Spar Output". A general description of solution output is given in Solution Output. See the ANSYS Basic Analysis Guide for ways to view results. 个别输出项由Figure 8.2： ”LINK8 3—D Spar Output"举例说明在Solution Output中则给出了单元解的通用描述详见 ANSYS Basic Analysis Guide.Figure 82  LINK8 3-D Spar OutputThe Element Output Definitions table uses the following notation:单元运用以下符号输出定义表格：A colon (:) in the Name column indicates the item can be accessed by the Component Name method ［ETABLE, ESOL］。

The O column indicates the availability of the items in the file JobnameOUT. The R column indicates the availability of the items in the results filename 列表示该项目可以通过构成名字的方法来获得［ETABLE， ESOL]第O 列表示该项有效的说明在文件JobnameOUT 中R 列表示该项的结果显示在results 文件中.In either the O or R columns, Y indicates that the item is always available， a number refers to a table footnote that describes when the item is conditionally available, and a - indicates that the item is not available无论在0 还是R 列中，Y 表示该项一直是可用的数值表示描述哪里该项是选择性提供的脚注，－表示该项不提供。

Table 8.1  LINK8 Element Output Definitions表 8.1 BEAM189 LINK9单元输出定义NameDefinitionORELElement NumberYYNODESNodes — I， JYYMATMaterial numberYYVOLU：Volume-YXC, YC， ZCLocation where results are reportedY2TEMPTemperatures T（I), T(J)YYFLUENFluences FL(I), FL(J)YYMFORXMember force in the element coordinate systemYYSAXLAxial stressYYEPELAXLAxial elastic strainYYEPTHAXLAxial thermal strainYYEPINAXLAxial initial strainYYSEPLEquivalent stress from stress—strain curve11SRATRatio of trial stress to stress on yield surface11EPEQEquivalent plastic strain11HPRESHydrostatic pressure11EPPLAXLAxial plastic strain11EPCRAXLAxial creep strain11EPSWAXLAxial swelling strain111. Nonlinear solution， on。