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Shock-induced transformation of nitinol shape memory alloy: Effect of stress state on transformation

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0155852· OSTI ID:2006597
 [1];  [2]
  1. Washington State University, Pullman, WA (United States); Institute for Shock Physics, Washington State University
  2. Washington State University, Pullman, WA (United States)
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Due to its numerous practical applications and intriguing phase transformation behavior, shape memory alloys (SMAs) have garnered significant research and development interests. In the past, most studies on the mechanical behavior of SMAs have been conducted under uniaxial stress loadings. Limited research on SMAs under shock loading has not provided conclusive results regarding their transformation behavior and transformation stress under such loading. Additionally, there is a lack of comprehensive understanding regarding the effects of different stress states on transformation behavior. The main objectives of this study are to address these issues. To achieve these objectives, a series of shock wave experiments were designed and conducted. Additionally, quasi-static and dynamic uniaxial stress experiments were carried out to establish a baseline for comparison. The results revealed that the transformation stress under dynamic uniaxial strain shock loading was approximately 1.92 GPa in contrast to 0.5 GPa (quasi-static) to 0.8 GPa (dynamic) observed in uniaxial stress loading. The transformation behavior exhibited noticeable rate sensitivity for both types of loading. There appeared to be a critical strain rate above which the austenite phase was driven to a metastable state. This estimated critical axial strain rate along the loading direction was approximately 2 × 103/s–4 × 103/s for uniaxial stress loading and approximately 2 × 106/s for uniaxial strain loading. The apparent high transformation stress for uniaxial strain loading can likely be attributed to a combination of high-pressure confinement and high strain rate. Furthermore, determining their relative contributions remains an open issue.
Research Organization:
Washington State University, Pullman, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003957
OSTI ID:
2006597
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 134; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (17)

Table I(p. 26)table Table I
Table II(p. 27)table Table II
Table III(p. 28)table Table III
Table IV(p. 29)table Table IV
Table V(p. 30)table Table V
Table VI(p. 31)table Table VI
Figure 1(p. 33)figure Figure 1
Figure 2(p. 34)figure Figure 2
Figure 3(p. 35)figure Figure 3
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Figure 10(p. 49)figure Figure 10
Figure 11(p. 51)figure Figure 11

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Related Subjects

36 MATERIALS SCIENCE
Alloys
Differential scanning calorimetry
Dynamic load testing
Interferometry
Materials analysis
Phase transitions
Poisson's ratio
Shock wave experiments
Smart materials
Stress strain relations