Weld/Fastener Element

Description

A weld element allows you to connect “entities” (Elements, Nodes, or patches of Nodes) which connect the nodes of the “entities” with an element of a specific diameter, material, and assigned orientation. A fastener element uses a similar type of connection, though the fastener has fewer definition options. There a quite a few more options on the corresponding property for a fastener such as mass, structural damping, and material coordinate system to go along with a specified diameter.

Application

Simulates a spot weld between two groups of finite element “entities” (Elements, Nodes, or patches of Nodes).

Shape

Drawn as a lines connecting the nodes of each group of finite element “entities” (Elements, Nodes, or patches of Nodes) to the spot where the weld/fastener orientation intersects the “entity”. The two sets of lines are then con-nected using a “tube” the size of the assigned diameter.

Note: If a weld endpoint is a single Element Vertex, (i.e., a node) then the “tube” will go from that Element Vertex to the lines or another Element Vertex, depending on the type of weld specified.

Element Coordinate System

By default, for both welds and fasteners, this depends on coordinate system of nodes. A separate material coordi-nate system can be specified for fasteners, which can be absolute or relative.

Properties

For Weld, Diameter of weld connection, Spot Weld designation (Yes/No), and whether to Eliminate M-Set DOF or not.

For Fastener, Diameter of the faster connection, Translational Stiffness values (KTX, KTY, and KTZ), Rotational Stiffness values (KRX, KRY, and KRZ), Material Coordinate System in which Translational and Rotational Stiff-ness are applied, whether the Material Coordinate System is Absolute or Relative, Mass of fastener, and Structural Damping.

Programs

This topic defines the entities that the FEMAP interfaces transfer to finite element analysis programs. Two transla-tion tables list the entities for these FEMAP interfaces:

• Section 7.1, "Translation Table for ANSYS, I-DEAS, NASTRAN, and MSC.Patran"

• Section 7.2, "Translation Table for ABAQUS, LS-DYNA, and MSC.Marc"

See also:

• Section 8, "Analysis Program Interfaces"

Using the Translation Tables

The following pages contain tables that show how FEMAP entities are translated to and from the supported analy-sis programs.

The numbered notes in the tables refer to the notes that follow the tables. You will find the notes are numbered from 1-N for each analysis program. Therefore, if you see note 6 in the column for ANSYS Write translator, that refers to Note 6 for ANSYS, not note 6 for one of the other programs.

You will see numerous <— symbols listed for the various read translators. Wherever you see this symbol, it means that the read translator supports the same entities as the corresponding write translator. The column for the write translator is to the left of the column for the read translator, hence the <— symbol. In some cases, the read transla-tor will support more entities than the write translatransla-tor. In those cases you will see “<— +” followed by the addi-tional entities that are supported. Whenever an entity is not supported by the corresponding read or write translator (or by the analysis program), you will see “---”

7.1 Translation Table for ANSYS, I-DEAS, NASTRAN, and MSC.Patran

FEMAP ANSYS I-DEAS NASTRAN MSC.Patran

Write Read Write Read Write Read Write Read

Coordinate Systems

Bar EN (BEAM4)^2,23 <——+ E¹² Dataset 748,

2412 (fe 21) <—— +(2438) CBAR⁴⁰ <—— Packet 2³ (Cfg=1) <——

Tube EN (PIPE16) <—— + E¹² Dataset 2412

(fe 21) <—— CTUBE (not

UAI, Cosmic) <—— ---

---Curved Tube EN (PIPE18) <—— + E¹² Dataset 748,

2412 (fe 23) <—— +(2438) CBEND (not

UAI, Cosmic) <—— ---

---Link --- --- --- --- --- --- ---

---Beam EN (BEAM44,

BEAM188)² <—— + E¹² Dataset 748,

2412 (fe 22) <—— +(2438) CBEAM⁴⁰

(Cosmic-CBAR) <—— Packet 2³ (Cfg=2) <——

Spring/Damper EN (COMBIN14)

ko[3]=0,1⁷ <——+ E¹² Dataset 2412

(fe 136, 137) <—— CROD³, CVISC,

Parabolic Plate EN (SHELL93)⁹ <—— + E¹² Dataset 748, 2412 (fe 92,

Parabolic Plane

ko[3]=0¹⁰ <—— + E^12,13 Dataset 2412

(fe 161) <—— CONM2⁸ <—— Packet 2³

Tube R (1,2) <——¹⁵ Dataset 776,

2437 <—— +³(789) PTUBE¹⁰ <—— ---

---Curved Tube R (1-3) <——¹⁵ Dataset 776,

2437 <—— +³(789) PBEND <—— ---

PBUSH, PBUSHT²⁵ as Rod, PVISC, PBUSH, PBUSHT²⁵

---

---FEMAP ANSYS I-DEAS NASTRAN MSC.Patran

Write Read Write Read Write Read Write Read

DOF Spring R (1,2) <——¹⁵ --- --- on Elem

ESYS¹⁵ Dataset 2437 <—— +³(789) PSHELL¹² <—— +PTRMEM, PQDMEM,

Plane Strain none ESYS¹⁵ Dataset 2437 <—— +³(789) PSHELL, PLPLANE¹² PPLANE⁶¹

<—— Packet 4⁴ <——

Parabolic Plane

Strain none ESYS¹⁵ Dataset 2437 <—— +³(789) PSHELL, PLPLANE¹² PPLANE⁶¹

<—— Packet 4⁴ <——

Laminated Plate R (1-60)³⁷ <—+ ESYS¹⁵ --- --- PCOMP^13,29

PCOMPG⁴⁶ <—— ---

---Axisymmetric none ESYS¹⁵ Dataset 2437 <—— +³(789) PLPLANE <—— Packet 4⁴ <——

Parabolic

Axisymmetric none ESYS¹⁵ Dataset 2437 <—— +³(789) PLPLANE <—— Packet 4⁴ <——

Solid ESYS <——¹⁵ Dataset 2437 <—— +³(789) PSOLID¹⁴ (+PIHEX-Cosmic), PLSOLID

<—— Packet 4⁴ <——

Parabolic Solid ESYS <——¹⁵ Dataset 2437 <—— +³(789) PSOLID¹⁴

---Rigid none none none none none none ---

---Stiffness Matrix R (1-78)¹¹ R (1-6, 13-17,

Write Read Write Read Write Read Write Read

Materials

Dataset 1710 <—— ⁴ MAT1, MAT4, MATT1,

Dataset 1710 <—— ⁴ MAT8, MAT5, MATT8, MATT5,

Dataset 1710 <—— ⁴ MAT3, MAT5, MATT3,

<—— Dataset 1710 <—— ⁴ MAT2, MAT5, MATT2,

<—— Dataset 1710 <—— ⁴ MAT9, MAT5, MATT9,

Write Read Write Read Write Read Write Read

Nodal D (=0.), M <——^17,18 Dataset 791 <—— ⁵ SPC, ASET,

BF(R5)²⁵ <—— Dataset 792 <—— ⁷ TEMP, Heat Transfer

SPC, TEMPBC <—— ---

---Heat Generation BF(HGEN) <—— --- --- SLOAD <—— Packet 10 <——

Heat Flux F(HEAT) <—— --- --- QHBDY <—— ---

---Nonlinear

Transient --- --- --- --- NOLIN1 thru 4,

TF --- ---

---Elemental Loads

Distributed Load SFBEAM <—— --- --- PLOAD1 <—— ---

---Pressure EP(R4),

SFE(R5)²⁶ <—— Dataset 790 <—— ⁷ PLOAD,

PLOAD2, PLOAD3,

Heat Generation BFE(HGEN) <— --- --- QVOL <—— Packet 11 <——

Heat Flux SFE(HFLUX) --- --- --- QBDY1 <—— ---

---Convection SFE(CONV) --- --- --- CONV, CONVM,

PCONV, PCONVM CONV

Acceleration ACEL <—— Dataset 790 <—— ⁸ GRAV <—— ---

---Rotational

Acceleration DCGOMG <—— Dataset 790 <—— RFORCE²¹ <—— ---

---Rotational

Velocity CGOMGA <—— Dataset 790 <—— RFORCE²¹ <—— ---

---Rotation Origin CGLOC <—— Dataset 790 <—— RFORCE <—— ---

---Default

Temperature TUNIF <—— + BFUNIF, TEMP(R5)

Dataset 792 <—— TEMPD <—— ---

---Heat Transfer --- --- --- --- PARAM,TABS

and SIGMA --- ---

Write Read Write Read Write Read Write Read

Miscellaneous

Write Read Write Read Write Read Write Read

/PREP7, /NOPR, /GOPR, /VIEW, /ANGLE, TOTAL, FINISH

Rev 4: KAN, ITER, AFWRITE Rev 5: ANTYPE, OUTPR, OUTRES

--- --- TSTEP, TSTEPNL,

NLPARM,

NCPCI, FREQ, FREQ1, FREQ2, FREQ3, FREQ4,

RLOAD2, TLOAD1, DPHASE, LSEQ, RANDPS, DTI TABDMP1, WEIGHTCHECK, GEOMCHECK, GROUNDCHECK, OMODES

TSTEP, TSTEPNL, NLPARM, NLPCI, FREQ, FREQ1, FREQ2, FREQ3, FREQ4, RLOAD2, TLOAD1, RANDPS, DTI, TABDMP1, GEOMCHECK, WEIGHTCHECK, GROUNDCHECK

---

---System Cells

(NX Nastran) --- --- --- --- ITER, ELEMITER

PARALLEL ENFMOTN⁵¹

---

---TB ³⁵ --- --- --- BEGIN BULK

SUBCOM, ENDDATA, Executive and Case Control

---

---FEMAP ANSYS I-DEAS NASTRAN MSC.Patran

Write Read Write Read Write Read Write Read

In document Femap User Guide (Page 142-151)