BEAM188µ¥ÔªÖÐÎÄ˵Ã÷ ÏÂÔØ±¾ÎÄ

You can apply an initial stress state to this element through the ISTRESS or ISFILE command. For more information, see Initial Stress Loading in the ANSYS Basic Analysis Guide. Alternately, you can set KEYOPT(10) = 1 to read initial stresses from the user subroutine USTRESS. For details on user subroutines, see the Guide to ANSYS User Programmable Features.

Äã¿ÉÒԶԸõ¥ÔªÍ¨¹ýistress ºÍisfile ÃüÁîÀ´¶¨Òå³õʼӦÁ¦×´Ì¬¡£Òª»ñÈ¡¸ü¶àµÄÐÅÏ¢£¬¿ÉÒԲο¼ANSYS Basic Analysis GuideµÄInitial Stress Loading¡£¿ÉÒÔÌæ»»µÄ£¬Äã¿ÉÒÔÉèÖÃkeyopt£¨10£©£½1 À´´ÓÓû§µÄ×Ó³ÌÐòustress À´¶ÁÈ¡³ö³õʼӦÁ¦¡£¹ØÓÚÓû§×Ó³ÌÐòµÄÏêϸ×ÊÁÏ£¬²Î¼ûANSYS User Programmable Features µÄÖ¸ÄÏ¡£

The effects of pressure load stiffness are automatically included for this element. If an unsymmetric matrix is needed for pressure load stiffness effects, use NROPT,UNSYM.

Ó¦Á¦¸Õ»¯×÷ÓÃÔÚµ¥ÔªÖÐûÓÐ×Ô¶¯¼ÆË㣬Èç¹û¶ÔÓ¦Á¦¸Õ»¯×÷ÓÃÐèÒª·Ç¶Ô³Æ¾ØÕó£¬Ê¹ÓÃnropt£¬unsym¡£ A summary of the element input is given in \.

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BEAM188 Input Summary BEAM188 ÊäÈëÊý¾ÝÕªÒª

Nodes ½Úµã

I, J, K (K, the orientation node, is optional but recommended)

K£¬·½Ïòµã£¬¿ÉÑ¡Ôñµ«ÊÇÍÆ¼öÖ÷¶¯ÊäÈë

Degrees of Freedom ×ÔÓɶÈ

UX, UY, UZ, ROTX, ROTY, ROTZ if KEYOPT(1) = 0 UX, UY, UZ, ROTX, ROTY, ROTZ, WARP if KEYOPT(1) = 1 Section Controls ½ØÃæ¿ØÖÆ

TXZ, TXY, ADDMAS (See SECCONTROLS) (TXZ and TXY default to A*GXZ and A*GXY, respectively, where A = cross-sectional area) Material Properties ²ÄÁÏÊôÐÔ

EX, (PRXY or NUXY), ALPX, DENS, GXY, GYZ, GXZ, DAMP Surface Loads ±íÃæÁ¦

Pressure -- ѹÁ¦

face 1 (I-J) (-z normal direction), face 2 (I-J) (-y normal direction), face 3 (I-J) (+x tangential direction), face 4 (J) (+x axial direction), face 5 (I) (-x direction).

(use a negative value for loading in the opposite direction)

(ÓøºÊý±íʾ×÷Ó÷½ÏòÏà·´)

I and J denote the end nodes.

I ºÍj ÊǶ˽ڵã

Body Loads ÌåÁ¦

Temperatures -- ζÈ

T(0,0), T(1,0), T(0,1) at each end node ζÈ×ø±êÔÚÿ¸ö½Úµã¶Ë²¿ Special Features ÌØÊâÌØÕ÷

PlasticityËÜÐÔ

ViscoelasticityÕ³µ¯ÐÔ ViscoplasticityÕ³µ¯ÐÔ CreepÈä±ä

Stress stiffeningÓ¦Á¦¸Õ»¯ Large deflection´óÄÓÇú Large strain´óÓ¦±ä

Initial stress import³õʼӦÁ¦µ¼Èë

Birth and death (requires KEYOPT(11) = 1)µ¥ÔªÉúËÀ£¬ÐèÒªKEYOPT(11) = 1 Automatic selection of element technology×Ô¶¯Ñ¡Ôñµ¥Ôª¼¼Êõ

Supports the following types of data tables associated with the TB command: Ö§³ÖÏÂÁÐÓÃTB ÃüÁîÏà¹ØµÄÊý¾Ý±íÖÖÀà

BISO, MISO, NLISO, BKIN, MKIN, KINH, CHABOCHE, HILL, RATE, CREEP, PRONY, SHIFT, PLASTIC, and USER.

Generalized cross section (nonlinear elastic, elasto-plastic,

temperature-dependent)¹ãÒåºá½ØÃ棨·ÇÏßÐÔµ¯ÐÔ£¬µ¯ËÜÐÔ£¬Î¶Ⱦö¶¨£©

Note

See the ANSYS, Inc. Theory Reference for details of the material models.

¶ÔÓÚ²ÄÁÏÄ£ÐÍϸ½Ú¿ÉÒԲμûANSYS, Inc. Theory Reference

See Automatic Selection of Element Technologies and ETCONTROL for more information on selection of element technologies.

¶ÔÓÚ¸ü¶àµÄ¹ØÐíµ¥Ôª¼¼ÊõÑ¡ÔñµÄÐÅÏ¢¿ÉÒԲμûAutomatic Selection of Element Technologies ºÍETCONTROL

KEYOPT(1)

Warping degree of freedom:Ťת×ÔÓÉ¶È 0 --

Default; six DOF, unrestrained warpingĬÈÏ6¸ö×ÔÓɶȣ¬²»ÏÞÖÆÅ¤×ª 1 --

Seven DOF (including warping). Bimoment and bicurvature are output.

7 ¸ö×ÔÓɶȣ¨°üÀ¨Å¤×ª£©£¬ Êä³öË«Á¦¾ØºÍË«ÇúÏß

KEYOPT(2)

Cross-section scaling, applies only if NLGEOM,ON has been invoked:

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0 --

Default; cross-section is scaled as a function of axial stretch

ĬÈÏ£»½ØÃæÒòΪÖáÏßÀ­ÉìЧӦ±»Ëõ·Å£»

1 --

Section is assumed to be rigid (classical beam theory)

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KEYOPT(3)

Interpolation scheme:²åÖµÊý¾Ý 0 --

Default; linear polynomial. Mesh refinement is recommended.

ĬÈÏ£»ÏßÐÔ¶àÏîʽ¡£ÒªÇó»®·ÖϸÖ¡£

2 --

Quadratic shape functions (effectively a Timoshenko beam element); uses an internal node (inaccessible to users) to enhance element accuracy, allowing exact representation of linearly varying bending moments

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KEYOPT(4)

Shear stress output:¼ôÓ¦Á¦Êä³ö 0 --

Default; output only torsion-related shear stresses

ĬÈÏ£»½ö½öÊä³öŤתÏà¹ØµÄ¼ôÓ¦Á¦

1 --

Output only flexure-related transverse shear stresses

½ö½öÊä³öÍäÇúÏà¹ØµÄºáÏò¼ôÓ¦Á¦¡£

2 --

Output a combined state of the previous two types.

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KEYOPT(6)

Output control at element integration point:

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0 --

Default; output section forces, strains, and bending moments

ĬÈÏ£»Êä³ö½ØÃæÁ¦¡¢Ó¦±ä¡¢ºÍÍä¾à

1 --

Same as KEYOPT(6) = 0 plus current section area

ºÍkeyopt£¨6£©£½0 Ïàͬ£¬¼ÓÉϵ±Ç°µÄ½ØÃæµ¥Ôª

2 --

Same as KEYOPT(6) = 1 plus element basis directions (X,Y,Z)

ºÍkeyopt£¨6£©£½1 Ïàͬ¼ÓÉϵ¥Ôª»ù±¾·½Ïò£¨X¡¢Y¡¢Z£©

3 --