Investigation of limit state criteria for amorphous metals

7th International Conference on Advanced Concepts in Mechanical Engineering

Comanici, A.M.^1 ; Sandovici, A.^2 ; Barsanescu, P.D.^1

Mechanical Engineering, Mechatronics and Robotics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^1

Mathematics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^2

关键词: Electrical conductivity;    Experimental determination;    Failure envelope;    Fracture criteria;    High-strength materials;    Mohr coulomb criterion;    Non-crystalline structure;    Triaxial state of stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012100/pdf
DOI  :  10.1088/1757-899X/147/1/012100

来源: IOP

【 摘 要 】

The name of amorphous metals is assigned to metals that have a non-crystalline structure, but they are also very similar to glass if we look into their properties. A very distinguished feature is the fact that amorphous metals, also known as metallic glasses, show a good electrical conductivity. The extension of the limit state criteria for different materials makes this type of alloy a choice to validate the new criterions. Using a new criterion developed for biaxial and triaxial state of stress, the results are investigated in order to determine the applicability of the mathematical model for these amorphous metals. Especially for brittle materials, it is extremely important to find suitable fracture criterion. Mohr-Coulomb criterion, which is permitting a linear failure envelope, is often used for very brittle materials. But for metallic glasses this criterion is not consistent with the experimental determinations. For metallic glasses, and other high-strength materials, Rui Tao Qu and Zhe Feng Zhang proposed a failure envelope modeling with an ellipse in σ-τ coordinates. In this paper this model is being developed for principal stresses space. It is also proposed a method for transforming σ-τ coordinates in principal stresses coordinates and the theoretical results are consistent with the experimental ones.