In a recent webinar hosted by ASM International, we presented several cases in which 2D DIC could be used effectively for in-plane mechanical testing, and we showed preliminary data to support this concept. The webinar received significant interest and led to many questions and requests for additional information! In this webinar, we present an expanded more comprehensive study in which detailed direct comparisons between 2D and 3D DIC measurements are carried out for selected material testing scenarios. We share results that demonstrate how 2D DIC can match (with negligible deviations) the output of 3D DIC, if done correctly. The goal is to promote the use of DIC and enable those with limited access to 3D DIC to still take advantage of 2D DIC and capitalize on the benefits it brings in enriching investigations of material deformation & failure.
Note: all project files (images, physical quantities, and even compiled DIC files) will be made available for everyone to process and further evaluate as needed. Some datafiles will be packages specifically for academia for use as training projects in classrooms.
Prediction of Springback is a very critical topic in sheet metal stamping, not only because of the complex models needed for its prediction, but also because it is difficult to perform the experimental characterization in the first place. There are no standard mechanical testing machines that can fully address the needs of such models without compromises. On the other hand, increased use of lightweight materials (advanced high strength steels with complex microstructures and aluminium alloys with higher strengths) escalates the problems with springback prediction especially that strength-to-stiffness ratios and anisotropy levels are continuously going up.
Therefore, we focus this webinar on presenting solutions to this problem through a set of experimental tools that are particularly designed to generate the data needed for a successful calibration of springback models. Moreover, we also discuss the integration of digital image correlation (both 2D and 3D) into experimental setups to facilitate higher levels of characterization that cannot be achieved by other modes of Extensometry and strain measurements.
This work tries to shed some light on the topic of accurate mechanical testing for Springback Prediction by introducing a new anti-buckling device that is particularly designed to enable accurate and repeatable compression and cyclic testing. The device is designed to address the limitations of other approaches and devices presented in the literature, and features control and monitoring of side forces, self-centering, and the ability to achieve large plastic compressive strains. More importantly, digital image correlation (DIC) is integrated with the anti-buckling device and testing load frame to provide accurate strain measurements.
In this study, DIC was used in a real-time mode to facilitate accurate load reversal during cyclic testing. For validation, the presented setup was used for testing two selected materials with practical applications in the automotive body sector: 6016-T4 aluminum and DP980 steel sheets. The results demonstrate how the developed setup and the integration with real-time DIC provide a robust and reliable means for generating high-quality curves for the different tests needed for the calibration of springback models.
Digital image correlation (DIC) has become an important tool in material testing practices for the advanced characterization of materials in a wide range of applications. Despite that, the cost of a commercial 3D DIC system might still be a hurdle for many educational institutions, and even for some industrial establishments! 2D DIC is simple, inexpensive and easily attainable, yet it lacks the accuracy and depth of field capabilities of 3D DIC.
Despite this limitation, there are many testing scenarios where material deformation is planar and thus 2D DIC can capture material deformation with sufficient accuracy.
This webinar aims to address this important issue by presenting direct technical comparisons between 2D and 3D DIC measurements for selected material testing scenarios. The ultimate goal is to enable those with limited access to 3D DIC to still take advantage of 2D DIC and capitalize on the benefits it brings in enriching investigations of material deformation & failure.
This webinar/demo sheds some light on the topic of high strain rate testing, and provides information supported by examples on how reliable high speed material characterization data can be obtained to support automotive CAE crash simulations. An overview of the latest generations of high speed testing machines and systems is first provided, then some testing technical details (test samples, test procedure, the use of DIC, issues with high speed testing, etc.) are discussed.
A live demonstration is also performed to provide hands-on experience and give the audience a feel of the details involved in high rate tension testing. Finally, high speed testing results obtained with some of the latest generations of lightweight automotive materials are presented, and the influence of deformation rate on material behavior is discussed.
In this webinar, FADI presented a cohesive story on the state of the art material characterization with digital image correlation (DIC), emphasizing the significant role of DIC in completely transforming the way we investigate deformation and failure in these materials. The webinar featured real-life examples progressing from standard testing systems to more sophisticated experimental setups that are particularly tailored for advanced materials or complex testing conditions. The selected examples cover several important engineering materials and a wide range of unique experiments and conditions that show the versatility and power of DIC.
