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

Wrinkle Evaluation

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

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

Initial Blank Line Evaluation

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

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

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

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

	Over 90% of region has dimensional differences within 1mm after compensation. Numisheet2005 benchmark#2 DP600 t=1.0mm
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

Project Management Panel

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

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.