-
Release 10.0 Documentation for
ANSYS
LINK8
LINK8 Element Description
LINK8
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 element.
LINK8
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：
< br>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 8.1 LINK8
Geometry
LINK8 Input Data
LINK8
输入数据
The geometry, node locations, and the
coordinate system for this element are shown
in
Figure 8.1:
.
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:
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<
/p>
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<
/p>
I
的温度
T(I)
默认为
TUNIF
。
节点
J
的温度
T(J)
则默认为
T(I)
< br>。
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
. 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 Summary
LINK8
输入摘要
Nodes
节点
I, J
Degrees of Freedom
自由度
UX, UY, UZ
Real 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, DAMP
Surface 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 Data
LINK8
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 8.1:
Definitions
.
?
?
附加输出在
Table 8.1:
中。
Several items
are illustrated in
Figure 8.2:
. 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:
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
。