ABAQUS VERSION 6.6.4 (Channel Bend)
Part → Criar geometria e já colocar pontos de referência RP
Part → create → name: sheet → 2D → deformable → sheel → continue → clik create lines: rectangle → segue promps em baixo da tela → (-50,-0.5) → enter → Esc → Done Part → create → name: BH → 2D → analytical rigid → aprox. Size 200 → continue → create lines: conecte lines → segue proms embaixo da tela → (60,0.0) → enter → (0.0,60) → enter →click create fillet → radius 5.0 → enter → click nas duas linhas → enter → esc → done → tools → reference point → select point near the radius.
Part → create → name: Punch → 2D → analytical rigid → aprox. Size 200 → continue → click create lines: connected lines → segue promps embaixo da tela → (0.0,60) → enter → (0,0) → enter → (-60,0.0) → enter → click create fillet → radius 5.0 → enter → click nas duas linhas → enter → esc → done → tools → reference point → select point near the radius
Part → create → name: Die → 2D → analytical rigid → aprox. Size 200 → continue → click create lines: connected lines → segue promps embaixo da tela → (0.0,-60) → enter → (0,0) → enter → (60,0.0) → enter → click create fillet → radius 5.0 → enter → click nas duas linhas → enter → esc → done → tools → reference point → select point near the radius
Property → Material → create → name: steel → mechanical Elasticity → elastic (ym = 210.000 MPa p.r = 0.3) Plasticity → plastic ys ps
400 0.0
420 0.02
500 0.2
600 0.5
Section → create → name: Blanksection → solid → huomogeneous → continue → plane stree/strain = 37 (largura da chapa em mm)
Assign → section → seleciona a chapa → done (lincar section a chapa → segue prompts → OK)
Assign → material orientation→ seleciona a chapa → done → clica no Y → abre a janela → name: datum csys 1 rectangular → continue → create datum
Assembly → montar as parts Instance → create → sheet → OK
Punch → OK Blank holder → OK Die → Ok
Constrains (posicionar coretamte os componenets) → edge to edge → seguir prompts → clicar na tela do punção e da chapa → se setas em mesma direção OK senão flip e então OK
Clearance =-1.0
Faz para obter o holder e die novamente ( Clearance = 0.0) Afasta um pouco o punção na direção 1 (clearance = 48) Isto cria automático
Set de geometrias (para especificar loads e boundary condictions BC’s) (Double click na arvore ara criar) → name:
Refblankcenter → seleciona a lateral esquerda da chapa → done Refblanktop → seleciona a parte de cima da chapa → done Refdie → continua → seleciona o RP → done
Refblankholder → seleciona o RP → done Refpunch → seleciona o RP → done
Para cada um tem que ficar selecionado o refential point (RP) ou ponto da chapa Steps → create (passos da simulação) (general → static, general para todos) Estabilish contact 1 → push the blank holder towards sheet
Contact of the sheet with blank holder and die Time period 1
On
Incrementation → maximum number of increments 100
Increment size 1 1E-005 1
Initial time increment → minimum time increment → total time period Holder Force → apply holder force
Force in the blank Time period 1 On
Maximum number of increments 100 Increment size 1 1E-005 1
Establish contact 2 → move punch to touch the sheet Punch move down 1 mm to touch the sheet
Time period 1 On
Maximum number of increments 100 Increment size 1 1E-005 1 Punch force → apply punch stroke Punch is moving down
Time period 0.0681 On
Maximum number of increments 1000
Fix all → fix all nodes and remove contact Fixa a chapa que esta se deformando Time period 1
On
Maximum number of increments 100 Increment size 1 1 1 Release all → release all nodes
Retira o punção, matriz e holder para aliviar o spring back Time period 1
On
Maximum number of increments 100 Increment size 0.1 1E-005 0.1
Interactions Holder Force → aplly holder force Force in the blank
Time period On
Maximum number of increments 100 Increment size 1 1E-005 1
Interactions → property → create → name: friction → contact → continue → mechanical → tangent behaviour → friction coefficient → 0.1
Surfaces (define as superficies → underneath assembly)
Double click → name: BlankTop → seleciona na chapa → done BlankBot → seleciona na chapa → done
HolderSurf → seleciona → done → escolher a cor DieSurf → seleciona → done → escolher a cor PunchSurf → seleciona → done → escolher a cor
Interactions → create → name: Die-Blank → for initial step (for all cases) → surface to surface → continue → clica na superficie master (rigida) → done → escolher a cor → click na superficie (slave → bottom sheet) → verificar → contact property → node to surface → friction → OK (fazer o mesmo para todos).
Load → BC’s (Boundary condition) → create (constrains → faze para cada um dos set de geometrias)
Blank deve ser fixado para chatering → utilizar os endpoints of the midplane of the blank
BC’s para step 1 (não contar o inicial)
RefCenterBC → holder down stages → mechanical → symmetric boundary constrains → continue → seleciona a região lateral da chapa → done → restringe movimentos XSYMM
RefCebter1BC → seleciona a região lateral da chapa → mechanical → displecement/rotational → u1 = u2 = 0; U2 = -0.04
F=RefFix WholeSheetBC → seleciona toda a chapa → mechanical → displacement/rotational → u1 = u2 = U3 = 0
RefDieBC → seleciona o RP → mechanical → displacement/rotational – u1 = ur3 = 0.0; u = +1E-08 (para dar uma movidinha para cima → fixar chapa e matriz → evitar chatering)
RefHolderBC → seleciona RP → mechanical→ displacement/rotinal → u1 = ur3 = 0.0; u2 = -1E-08 (para dar uma movidinha para baixo → fixar chapa e holdr → evitar chatering)
RefPunchBC → seleciona o RP → mechanical → displacement/rotinal → u1 = ur3 = 0.0(fixa completamente)
Create a Mechanical concentrated force
Load → name: load holder → create (cria para o step holder force) → mechanical → concentrated force → seleciona o RP do holder → done
CF2 = -5000N → OK (aparece o carregamento do holder no RP) BC’s para o step 2
Remove the conition to mov blank holder down. O blank holder deve ser liberado totalmente nos movimentos na direção 2 (y).
Para fazer isto uncheck the Box u2. It Will became modified. BC’s para step 3
Punch moves down just to achieve contact with the blank
Vertical constraint on set RefMidLeft should be removed and small pressure should be applied on top of the blank.
Change (edit command) RefPunchBC specifying -1.0 for u2. Load and BC’s para step 4
Move the unch down to forming operation.
Using boundary condition manager → Edit RefPunchBC specifying -31 for u2 Load and BC’s para Step 5
Fixar totalmente a chapa, mas desativar o próximo. Load and BC’s para Step 6
Cria o úlimo passo. Mesh
Seleciona a chapa → controls → quad → free
Element type → standar → plane strain → reduced integration (cpe4r) Seed → edge by number (click na superficie)
200 (nas duas horizontais da chapa) 2 thickness (nas quatro seccos riadas) Mesh → part → yes
Job → create
Name: ____________ → OK Subimit → name
Verification
Springback Analyses in ABAQUS/Std (Abaqus documentation cap. 13.5.5 channel banding)
1) copy model explicit and names as import (copy below in the same section of abaqus) 2) delete:
Part intances → punch 1, die 1, holder 1 Sets → ref die, ref holder, ref punch All surfaces
All contact interactions and properties Both analysis steps
3) a) create step → name → springback → general, static → continue → time increment = 0.1
Description: Analysis of springback Nigeon → off time period = 1 Initial 0.1 max = 0.1
Toggle on → use stabilization with dissipated energy factor → OK b) In Assembly → eng. Features → inertia → delete
4) In the model tree → fields → name: springback → create fields display hax → select → initial → other → initial state → continue → select blank → done → job menu → job name: forming – 3 → sqrt5 → OK
5) In step → springback → BC → center BC → XSYMM type → BC → zero-velocity → V = 0 → of midleft point (to fix blank at the 2 directions) → OK
6) Job → create job → springback → desp = analysis of springback → job manager → submit.
