MAREŠOVÁ Martina COMTES FHT a.s.

Spoluautoři KONOPÍK Pavel

As prediction of material behaviour by Finite Elements Analysis is nowadays an integral part of material engineering, the necessity to obtain relevant material data with highest accuracy possible became crucial. Usually, tensile tests are performed under quasi-static conditions, which mean that the loading of specimen corresponds with strain rate about hundredths s-1. In reality, however, materials are often subjected to much higher strain rates (up to thousands s-1) and their properties can change rapidly with rising strain rate. Material testing at high strain rates is important especially for materials that are used in applications where impact damage is probable, such as in pressure vessels, vehicles etc. For this paper, individual tests were performed at strain rates from hundredths s-1 up to hundreds s-1, recorded using standard or high speed camera and evaluated by Digital Image Correlation (DIC) method. This method is based on recognition of change of pattern in sequence of images. Stochastic pattern is applied on the surface of the specimen prior testing. Under the load, the specimen is deformed and so is the applied pattern. Comparing the images, changes in the pattern are registered and displacements and strains are calculated. The results are discussed.

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