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JSTAMP
Integrated Forming Simulation System for
Virtual Tool Shop

Functions and Features

Crack/Wrinkle Evaluation (e.g. Dash Upper)

The accuracy of JSTAMP/NV is shown by comparing the results between virtual simulation and actual try.(Courtesy of G-TEKT CORPORATION)

Crack Evaluation

JSTAMP/NV accurately predicts the locations and sizes of two cracks. (JSTAMP/NV shows thinning distribution.)


JSTAMP/NV Actual Try Product

JSTAMP/NV

Actual Try Product



Wrinkle Evaluation

JSTAMP/NV accurately predicts the wrinkles.(See the locations and shapes of the wrinkles)


JSTAMP/NV Actual Try Product

JSTAMP/NV

Actual Try Product


Crack Evaluation (e.g. Hood Inner)

By the comparison between JSTAMP/NV result and the actual try product, it can be shown that JSTAMP/NV predicts accurately the location of crack of the Hood Inner panel. Around hinge region shows over 30% of thinning in the simulation. Actually, the crack is recognized at the same region of the actual try product. This crack can be removed through the convinient JSTAMP/NV features. Specially using in the re-analysis feature, the die face geometry or product geometry can be substituted to the new ones partially or totally.



JSTAMP/NV Actual Try Product

JSTAMP/NV

Actual Try Product



Initial Blank Line Evaluation

  • High Accuracy Considering Neutral Surface Movement
  • Speedy Solution in Minutes

Initial Blank Line Evaluation

Trim Line Evaluation

  • Considering Neutral Surface Movement
  • Little Geometrical Error
  • Speedy Solution with accuracy in Minutes by HYSTAMP (Inverse Solver One-step Method)
  • Addingg Accuracy with LS-DYNA by the Auto Trim Line Correction

Trim Line Evaluation

Springback Evaluation


Springback Evaluation

Kinematic Hardening Material Model: Yoshida-Uemori Model

  • 7 Parameters Material Model
  • Considering Elastic Modulus Change Due to Plastic Deformation
  • Considering Bauschinger Effect in Cyclic Loading/Unloading
  • Appropriate to High Strength Steel Sheet

Yoshida-Uemori Model

Yoshida-Uemori Model


Springback Evaluation

  • Uniform 3-D Springback Measurement regardless of Constraint Conditions
  • Various Kinds of Fitting Features; Best Fit, 3 Point Fit, Axis Match, etc.
  • Direct Measurement and Calculation of Sectional Angle, Normal Difference, Radius, etc.


Springback Compensation

CAD surfaces compensated can be generated from JSTAMP/NV springback compensation.


CAD Surface Generation
CAD Surface Generation

Over 90% of region has dimensional differences within 1mm after compensation.

Numisheet2005 benchmark#2
DP600 t=1.0mm

Comparison of Springback Dimensional Difference

Comparison of Springback Dimensional Difference


Multi-Stage Process Management (Intuitive Analysis Condition Setting)

  • Management of Virtual Try-outs through Project Management Panel
  • Definition of Multi-stage Process
  • Parameters Input through Forming Stage Flow Panel
  • Navigation and Verification of Assigned Modeling
  • Consecutive Bundle or Selective Independent Executions
  • Customized Process Template for Analysis Automation
Forming Stage Flow Panel
Forming Stage Flow Panel


Project Management Panel
  • Central Management of Virtual Try-Outs
  • Convenient Check of Design Alternatives
  • Efficient Storage Usages
  • Reduction of Repetition Jobs

Project Management Panel

Re-Analysis Function

Most of design changes can be controlled easilly through the Re-Analysis Function in JSTAMP/NV. Design change anternatives are generally a blank material, initial blank position and size, and geometries of dieface or product. JSTAMP/NV Re-Analysis function gives a template that defines design changes above mentioned. These changes can be checked conveniently using another powerful function, Process Comparison, in JSTAMP/NV.


Material Database

The material database of JSTAMP/NV provides more than 100 material types including high strength steel sheet and aluminum sheet as the standard database. Also, the test results by user can be added to the JSTAMP/NV material database easily. In case of unsufficient material data, the simulation could start immediately using JSTAMP/NV material database. JSTAMP/NV material database is being renewed progressively.


Hierarchical Management of Material Database

Not only master material data but also the user material data can be managed by the user.



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