The VIC-3D High-Speed (HS) Digital Image Correlation system is a high-speed measurement system for full-field shape, displacements, velocities, strains, and much more. Systems with frame rates from 1,000 to 500,000 Hz are available, and configurations are customized to your applications and budget. See the VIC-3D Ultra High-Speed system page for frame rates up to 5MHz. Our systems are streamlined and integrated with supported high-speed cameras with acquisition software VIC-Snap HS, which allows the user to acquire calibration and test images with ease. Synchronized images are seamlessly acquired and saved in the correct format for fast data analysis in VIC-3D. Furthermore, VIC-Snap HS enables external analog data to be recorded via an included data acquisition system synchronizing load or displacement data frame-by-frame.
The VIC-3D HS system includes all the benefits of the standard VIC-3D system in addition to fully-integrated high-speed cameras. Shape, movement, and strain are tracked and computed for every data point (pixel subset) within the field of view. Since this data is calculated in three dimensions, out-of-plane displacements are measured directly, essentially eliminating bias. All calculations are done quickly and automatically with the included VIC software suite.
子弹冲击防弹衣的全场变形与位移测量 High Speed Ballistic Impact & Digital Image Correlation
High-Speed cameras are very useful for the qualitative assessment of high speed events; however, it can be very tedious to obtain quantitative data from images without good software. Motion tracking software helps with this problem, but can only track movement at defined points, and is generally less accurate. Since the VIC-3D HS system analyzes a speckle pattern which is applied to the surface of the specimen, full-field data is captured and local strains area easily identified and measured. VIC-3D also includes FREE integrated marker tracking capabilities, as an added benefit. This can be useful if displacements are only needed at select points, such as the head or limbs on a crash test dummy. Common dynamic applications for this powerful system included (but not limited to) crash testing, air bag deployment, vibration analysis, bird strike tests, ballistic events, explosive events, drop tests, Kolsky bar test, fracture mechanics, and much more.
Below are the general features of the VIC-3D HS system; however, system configurations do vary. Please call us to discuss your applications as it is our goal to provide you with accurate information about every system that is right fit for you.
Studying the behavior of metals during a high-speed dynamic compression event has always been challenging due to the complex test set up and fast data capture rates required. Currently, very little literature is available regarding deformation behavior at strain rates of 10 to 500s-1. Utilizing high-speed cameras, the VIC-3D HS system can be used to quantify the surface displacements and strains in three dimensions over the entire field with great precision. Digital Image Correlation (DIC) has gained widespread popularity over recent years in such high-speed applications due to its high accuracy, flexibility and ease of use.
在这个案例中，一个6mm直径的金属圆柱形样品以50s-1的应变速率被压缩。 VIC-3D HS系统用于捕捉实验过程中样品表面的位移和应变。 通过样本制备随机散斑图案，使VIC-3D分析软件能够轻松追踪变形到亚像素精度。 尽管高速摄像机能够使用更高的采集速率，但在此次测试中，它们被设置为14,400fps的适当帧率，以达到实验过程中获取足够数量的图像的同时最大化空间分辨率。 图像采集器在1024 x 400像素的分辨率下进行后触发控制。 碰撞发生后，图像被传输到计算机的硬盘，然后使用VIC-3D分析软件进行后处理。
In this example, a 6mm diameter cylindrical specimen was compressed at a strain rate of 50s-1. The VIC-3D HS system was used to capture the surface displacements and strains on the specimen during the event. A random speckle pattern is applied to the specimen that allows the analysis software to easily track the deformation to sub-pixel accuracy. Although the high- speed cameras are capable of much higher capture rates, for this test they were set to an appropriate frame rate of 14,400fps to maximize spatial resolution while acquiring an adequate number of images during the event. The cameras were post-trigger at a resolution of 1024 x 400 pixels. After the event, the images are transferred to the computer’s hard drive, and then post-processed using VIC-3D analysis software.
图片由俄亥俄州立大学的Amos Gilat和Jeremy Seidt提供 Images courtesy of Amos Gilat & Jeremy Seidt at Ohio State University.