By means of our test and evaluation concepts in material testing we deliver material data for all current FE-Solvers, material models and complex types of loadings, e.g.:
- ABAQUS, ANSYS, LS Dyna, Pam Crash, MSC, Radioss, NX, Algor
- Hyperelasticity, viscoelasticity, elasto-plasticity, viscoplasticity, anisotropy, damage, kinematic hardening etc.
- crash, metal forming, fiber assemblies, gaskets, die castings etc.
Together with our cooperation partners, we also invent test and evaluation concepts for many other individual issues of our clients that are not listed in the index. We look forward to your request. As a customer, you provide to us only the specimen. We will take care of everything else. Finally, you get the complete material data sets, edited for your Solver, a detailed test report with verifications as well as diagrams and films for internal presentation purposes.
Newly invented material testing method
In contrast to the more expensive and limited usable serial testing and evaluation of homogeneous stress states out of tensile, shear, compression, biaxial and / or other types of tests, we focus on:
- Test specimens with inhomogeneous strain fields
- High-resolution, multi-dimensional optical metrology
- Fully integrated optimization strategies
In this way, we guarantee that our material data sets can optimally reproduce all important aspects of the behavior of components. This includes both the multiaxial stress overlays as well as the physical nonlinearity of the material behavior up to failure. In the following two figures, a rectangular specimen with a hole is shown in a tensile test. Because of the hole it is exposed to a multi-axial strain state, which is recorded by means of an optical measurement system at each load step in a resolution of about 1000 to 3000 measuring points (figure right).
In the next step the measurement grid is mapped via interpolation on the FE mesh of a corresponding FE model, so that at any load step, the values of the measured displacements can be compared with the related displacements of the simulation (see following pictures).
Each measurement point on the specimen surface corresponds to a test that causes different proportions of tension, shear and compression inside the material. Therefore a single tensile test on a perforated rectangular specimen represents approximately 1000 up to 3000 load combinations, depending on the measurement resolution (see below).
By means of a global gradient based optimization routine the material properties of the used material model can be adjusted so that the FE-simulation deviates minimal from the optical measurements for the entire deformation range. Hereby our customers receive the complete set of material data for any constitutive law implemented in current FEA-Software within one optimization step.