Experimental and FEM analysis of the fracture behavior in NiTi shape memory alloys

Xinmei Wang; Zhufeng Yue

doi:10.4028/0-87849-413-8.919

Experimental and FEM analysis of the fracture behavior in NiTi shape memory alloys

Xinmei Wang, Zhufeng Yue

School of Mechanics,Civil Engineering and Architecture

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

In the present work, the fracture toughness of a NiTi pseudoelastic alloy has been obtained by experiments on CT specimens, which is K_IC = 39.38MPam^1/2. Then the stress induced phase transformation behavior in front of the crack tip of the CT specimen is simulated by a micromechanical model considering the different elastic properties between martensite and austenite. The results show that the pre-crack promotes phase transformation at the crack tip. And the phase transformation is localised near the crack tip. It is also shown that phase transformation reduces the Mises stress around the crack tip.

Original language	English
Pages (from-to)	919-922
Number of pages	4
Journal	Key Engineering Materials
Volume	324-325 II
DOIs	https://doi.org/10.4028/0-87849-413-8.919
State	Published - 2006

Keywords

Experiments
FEM
Fracture
NiTi shape memory alloys

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10.4028/0-87849-413-8.919

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abstract = "In the present work, the fracture toughness of a NiTi pseudoelastic alloy has been obtained by experiments on CT specimens, which is KIC = 39.38MPam1/2. Then the stress induced phase transformation behavior in front of the crack tip of the CT specimen is simulated by a micromechanical model considering the different elastic properties between martensite and austenite. The results show that the pre-crack promotes phase transformation at the crack tip. And the phase transformation is localised near the crack tip. It is also shown that phase transformation reduces the Mises stress around the crack tip.",

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AU - Yue, Zhufeng

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AB - In the present work, the fracture toughness of a NiTi pseudoelastic alloy has been obtained by experiments on CT specimens, which is KIC = 39.38MPam1/2. Then the stress induced phase transformation behavior in front of the crack tip of the CT specimen is simulated by a micromechanical model considering the different elastic properties between martensite and austenite. The results show that the pre-crack promotes phase transformation at the crack tip. And the phase transformation is localised near the crack tip. It is also shown that phase transformation reduces the Mises stress around the crack tip.

KW - Experiments

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KW - Fracture

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VL - 324-325 II

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JO - Key Engineering Materials

JF - Key Engineering Materials

ER -

Experimental and FEM analysis of the fracture behavior in NiTi shape memory alloys

Abstract

Keywords

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