More accurate CAE analysis in product design using composite materials
Verification of application of a new out-of-pane shear test method by modified notch compression for a plain weave GFRP using homogenization analysis
In recent years, GFRPs (Glass Fiber Reinforced Plastics), which have high specific strength, excellent workability and moldability, have been widely applied to electronic substrates, ships, automobile exteriors, etc., and have become indispensable materials. Composite materials, such as GFRPs, are anisotropic and have a complicated internal structure, so they exhibit complex deformation/fracture behavior related to tension, compression, bending, in-plane shear, out-of-plane shear, or a combination of these. In order to design an accurate product, there is a strong demand for a test method that can evaluate each fracture behavior individually. In particular, it is said that out-of-plane shear characteristics are difficult to obtain. In this case, the applicability of a test method was verified by conducting a new out-of-plane shear test, which improves upon JIS K7092, for a plain weave GFRP, which is a widely used composite material, and comparing it with the analysis results.
Obtaining experimental data
Result of out-of-plane shear test
Strain distribution (DIC) during out-of-plane shear test
Obtaining internal structural data
Internal structural data of out-of-plane share test specimen
Creating an analytical model
Shape parameter identification using internal structure data
Simpleware
Automatic optimization of tow volume content
Ansys® Workbench
DesignXplorer
Creating an analytical model
Multiscale.Sim
Comparison of experimental results and analysis results
By applying the analysis model using the internal structure data acquired by X-ray CT, analysis results similar to the actual test were obtained.
Since the uniformity of the shear strain distribution in the center of the test specimen was maintained in both the actual test and the analysis, this out-of-plane shear test method is one in which shear strain is accurately applied.
The data posted is the result of joint efforts by Shimadzu Corporation and Cybernet Systems Co., Ltd.
Shimadzu Corporation acquired mechanical characteristics and internal structure data, and Cybernet Systems Co., Ltd. conducted CAE analysis.
Key points!
- The combination of high-resolution internal observation by X-ray CT and high-precision measurement by a testing machine improves the accuracy of CAE analysis.
- Accurate actual testing is possible due to the shape of the test specimen and the new out-of-plane shear test jig, in which strain is evenly applied to the center of the test specimen.
- Accurate strain distribution measurement is possible with a non-contact displacement measurement system.