A New Method for Calculating the Fracture Strain of Shear and Notched Specimens at Various Temperature and Stress Triaxialities

Document Type : Research Article

Authors

1 Engineering and Construction of Non Ferrous Mines and Metals Commercial Services Company, Tehran, Iran

2 Department of Mechanical Engineering, University of Tehran, Tehran, Iran

Abstract

Determining stable characteristics of material behavior under the effects of stress and temperature on the material is significantly important for optimal design. The aim of this study is to present a new method for measuring the fracture strain of shear and tensile parts in different stress triaxialities with the effect of temperature, using a Video Measuring Machine measuring device. Aluminum 5083-H321 is used in this study. For this purpose, twenty-four different samples including shear and tensile samples for four types of triaxialities 0.2, 0.33, 0.38, and 0.55 were prepared for testing in the temperature ranges (25, 200, and 400°C). The samples are tested under monotonic (static) loading conditions. The fracture strains are measured. The stress triaxialities are calculated in the finite element simulation. The obtained results are compared with the other experimental results and also with the numerical results of the Rice and Tracy model. A good agreement is found between these results which validates the new proposed technic for measuring the shear fracture stain. Based on the results, the curve of fracture strain versus stress triaxiality has a decreasing trend at 25°C, while this curve is almost constant at 200°C and has an increasing trend at 400°C.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 54, Issue 8
November 2022
Pages 1917-1932

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