Shrinkage and warpage analysis
Moldflow shrinkage and warpage analysis
Warpage occurs when there are variations of internal stresses in the material caused by a variation in shrinkage. Warped parts may not be functional or visually acceptable.
- Non-uniform cooling.
Temperature differences from one side of the mold to the other can lead to layers freezing and shrinking at different times and generating internal stresses.
- Inconsistent shrinkage.
Resulting from：
- Material variations such as property variations, Fillers, varying moisture content, inconsistent melt and pigmentation;
- Process conditions variations such as inconsistent packing and varying mold and melt temperatures;
- Machine variations such as a damaged check ring and unstable controller.
Part shrinkage
MPI/Warp calculates shrinkage and warpage in injection molded plastic parts and predicts where deformations will occur.
Results allow St. Hua to optimize design, material, and processing parameters to control part warpage before the mold is built.
Deflection results
With MPI/Warp, even the most demanding application that requires high dimensional stability, excellent visual appearance, and accurate fit with mating components can be produced to quality, time, and budgetary specifications.
In mold compensation is also possible. By exporting a inverse model from Moldflow toolmakers are able to compensate for unavoidable distortion in the mold.
Shrinkage and warpage analysis capability:
Evaluate final part shape before machining the mold
Evaluate both single cavity and multi-cavity molds
Scale shrinkage and warpage results for better visualization of deformation
Query any two points to determine any dimensional change between the two
Constrain the part on a plane for better measurement of deflection
Separate total displacement into X-, Y-, and Z-axis displacements to show only the deflection in each direction
Show shrinkage and warpage as a visible displacement plot or as a color contour or shaded plot
Export warp geometry in the STL format to use as a reference when sizing the mold
Export warp mesh model for an iterative warpage analysis
| Shrinkage and Warpage results include: Total deformation Deflection in the X-, Y-, and Z-directions Deflection history at any node Deflected component shape with exaggeration factor Buckling mode shape Elemental parallel and perpendicular shrinkage Elemental principal residual stress (midplane) Elemental Mises-Hencky stresses (midplane) Elemental maximum shear stress (midplane) Standard results from MPI/Flow, including: - Volumetric shrinkage Standard results from MPI/Fiber, including: - Thermo-mechanical properties of the composite material |
Features:
Small Deflection Analysis: Linear Solver
Large Deflection Analysis: Non linear Solver
Geometric non-linear large deflection
Predicts the deformed shape after buckling
Features load or displacement control
Single Variant Analysis: Isolate cause of distortion
Isolates and predicts the effects on warpage components including:
- Molecular/fiber orientation
- Cooling variations
- Shrinkage variations
- Corner effects
Moldflow Plastic Adviser, Moldflow Mpi, Mold flow communicator and Mold Adviser are Mould flow software products for simulating the injection molding of plastic materials. Moldflow is the registered trademark Moldflow Corporation & Moldflow Europe ltd as advised in many trade magazine publications and press releases.
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