Anisotropy and the Determination of the r-Values with DIC!
Measuring the r-value(s) (Lankford Coefficient) for a material is seemingly easy, but when considering: (i) migrating from conventional extensometers to non-contact optical tracking (Digital Image Correlation), (ii) materials with limited ductility (iii) materials with non-homogenous deformation (PLC banding) (iv) going from quasi-static to intermediate and high strain rates … then things could become confusing! This webcast tackles r-value measurements for different materials and under different conditions in an effort to improve its reliability!
Does Strain Hardening Change with Strain Rate?
Sheet Metal Formability Testing with DIC _ Part-II:
Beyond the Conventional! Webinar
In a previous webinar, we did shed some light on the topic of “material formability” in the automotive sector, covering the main formability testing approaches and how they are used to test automotive materials. In addition to conventional steels, we covered FLC testing for advanced high strength steels, and some of the latest aluminium alloys. In this webinar, we go further with formability testing and we go well beyond the automotive sector by addressing advanced topics in Formability:
Digital image correlation (DIC) is of critical importance to formability testing, thus we will dedicate a portion of this webinar to the advanced integration and use of DIC in custom formability testing, including the topics of high speed DIC.
Can we Improve the Reliability of the Unreliable HER Test?
The HER test is notorious for being somewhat “not reliable” … between the loose punching clearances dictated within the ISO-16630, the open topic of punch-to-test holding time, the edge quality of punching tools, the qualitative end-of-test criterion … it is not surprising how HER test results are typically scattered with highly operator & lab dependency! This webcast tackles the HER test from different angles in an effort to improve reliability and get us closer to better unification and standardization.
Is the Elastic Region Truly Elastic & Linear?
High Speed Material Testing;
Improving the Input for Crash Simulations Webinar
Can 2D DIC Replace 3D DIC in Tension Testing?
FLCs for AA5xxx…
How to Deal with the Problematic PLC Banding? Webcast
On the Reliable Testing of Thin Foils
& Laminates for the Battery Industry Webinar
Does the 0.2% Offset Method work for AHSSs?
YES … Even Forming Limit Curves Can Be Obtained with 2D DIC!
Through a series of previous webinars & webcasts over the past two years, we have been demonstrating the power of 2D Digital Image Correlation (2D DIC) in transforming the way we perform material testing by improving and enriching what was conventionally possible with strain gages and extensometers, and opening the doors for measurements that were not possible before. The main objective has been to promote researchers and testing specialists to take advantage of the power of DIC in spite of the high cost and relative complexity associated with 3D DIC.
In this webinar, we go further by expanding the limits of 2D DIC into complex tests that involve out-of-plane deformation! Our focus in this webinar will be on forming limit curves (FLC) testing, a very important test for the automotive sheet metal forming sector, and one known to require stereo (3D) DIC systems and complex post-DIC algorithms for extracting FLC data points. We will show direct comparisons between 2D and 3D DIC measurements in order to demonstrate how, if done correctly, 2D DIC can match (with negligible deviations) the output of 3D DIC!
Careful How You Use DIC for the Extraction of FLC Points!!!
In sheet formability testing per ISO 12004-2, many DIC-processing and post-processing parameters could have significant impact on the extracted FLC points; unfortunately, the user may not realize their impact simply because they are hidden or implicitly related to hard settings in commercial DIC software. This webcast addresses this important issue, highlighting the pitfalls and issues that usually lead to discrepancies in FLC results within or across different
DIC in Support of Fracture Testing:
Opportunities & Challenges Webinar
Calibration of fracture models requires a suite of mechanical tests that cover a wide spectrum of loading conditions (the most critical of which are balanced biaxial tension (BBT), plane-strain tension (PST), uniaxial tension (US), and pure shear (SH)). While these tests are well-known, achieving the intended stress-triaxiality that corresponds to each one of these loading cases could be difficult.
In this live webinar, we shed some light on this important topic and present the integration of digital image correlation (DIC) with mechanical testing to support the development and refinement of “fracture testing”. We show how DIC can assist in tracking the evolution of stress-triaxiality in the material, thus enabling the optimization of fracture test sample geometries. On the other hand, we dedicate a significant portion of this webinar to cover the limitations of using DIC in calibrating fracture material cards, highlighting the technical challenges and drawbacks that require significant attention beyond the simple use of DIC as a trusted-tool for reading local strains around the fracture point!
Are Aluminium Alloys Truly Strain Rate Insensitive?
This webcast sheds some light on the topic of strain rate sensitivity of aluminium alloys; are they all truly insensitive to deformation rate or are there varying degrees of sensitivity depending on the alloy or series! Moreover, how to fully characterize rate sensitivity; by strength? ductility? or other parameters?
The webcast will also cover some of the challenges of high speed material testing and high speed digital image correlation (DIC).
Sheet Metal Formability Testing with DIC
Part-I: For Evolving Automotive Materials Webinar
Despite the introduction of new classes of lightweight materials and manufacturing techniques, “stamping” of steel sheets is still the dominant manufacturing approach for mass production of automotive body structures. That being said, there are still many new grades of steel and high strength aluminium alloys that are progressively introduced to the sector, thus posing evolving challenges both in terms of manufacturing and material characterization for forming simulations (FEA).
In this webinar, we shed some light on the topic of “material formability” with focus on the automotive sector. We cover the main formability testing approaches and how they are used to test the wide range of automotive materials. Beyond conventional steels, particular emphasis will be made to addressing the needs of the industry in testing the latest generations of advanced high strength steels and aluminium alloys. Digital image correlation (DIC) is of critical importance to formability testing, thus we dedicate a portion of this webinar to the integration of DIC with formability testing, and the use of DIC to extract FLC points via different algorithms/approaches.
YES … 2D DIC is Still Powerful & Effective
for Many Material Testing Applications! Webinar
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
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.
Monotonic & Cyclic Testing with DIC for the
Calibration of Complex Springback Models Webinar
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.
How Effective is 2D DIC in Material Testing? Webinar
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.
High Strain Rate Tension Testing of Lightweight
Materials for Automotive Crash Simulations Webinar
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.
Digital Image Correlation in Support
of Complex Testing of Advanced Materials Webinar
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.