Determination of spring elements characteristics using shape memory effect during thermomechanical impact

Polishchuk, V. A.; Nikolaiev, O. L.; Zadorozhnaya, Tetiana P.

doi:10.15589/jnn20160104

Cited by 2 publications

(1 citation statement)

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“…Work [12] reports the results of research on ensuring the stabilization of the characteristics of spring elements and the formation of optimized parameters of the shape memory effect due to preliminary heat treatment and subsequent thermal-force cycling. On the basis of experimental data, approximating dependences were obtained, which make it possible to evaluate the changes in the deformation-force characteristics of spring elements in the process of thermoforce cycling, depending on the number of cycles and the deformation of the guidance.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Pylypchak,

Epifanov,

Patsurkovskyi

et al. 2024

EEJET

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The object of research is the deformation-force characteristics of spring elements of thermostatic steam traps with the shape memory effect. The research solves the problem related to the imperfection of the design of steam traps controlling elements and their high inertia. Experimental studies on the impact of the spring force elements cooling rate on the deformation-force characteristics were conducted. Experimental studies showed that the significant impact of the spring force elements cooling rate on the deformation-force characteristics is observed exceptionally under the deformation mode at a temperature t ≤ Мf. Based on the results of the experiments, it was found that decreasing the cooling rate from 66.7 to 0.013 °C/s has a positive effect on the spring element deformation-force characteristics. Distinctive feature of the work is the study of winding pitch and thermal force cycling impact on the deformation-force characteristics of spring elements. It was found that using thermal force cycling makes it possible to reduce the force required for complete compression of the spring element by 60 %. Intensive decrease in the force required for the complete compression of the spring elements occurs during the first 100 thermal force cycles. The rational method for spring elements heat treatment has been given. It is based on the next steps: heating to a temperature of 400–500 °C for 1 hour; exposure at this temperature for an hour; cooling with rate 0.013 °C/s, the number of thermal force cycles is at least 100 with a winding pitch of 8·10–3 m. Based on research results, an improved design of thermostatic steam trap with controlling element in the form of cylindrical compression spring made of the VSP-1 alloy based on nitinol has been presented

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Pylypchak,

Epifanov,

Patsurkovskyi

et al. 2024

EEJET

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Improving the Models of Dynamics of Adaptively Controlled Elements and Drives Based on Functional Materials

Nikolaiev¹,

Polishchuk²,

Zadorozhna³

2020

Metallofiz. Noveishie Tekhnol.

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The investigation of thermo-mechanical processes in materials and elements with shape memory effect (SME) and the simulation of dynamics of elements and drives based on alloys with shape memory and taking into account the adaptation properties of material are carried out in order to develop adaptive-controlled thermomechanical drives or actuators, heat regulator and automation tools of technological processes. The effect of the thermal cycling modes and the magnitude of deformation, which induces the shape memory effect, on the level of reversibility of the deformation, the implementation of the effect of reversible shape memory, the magnitude of the excited force, and the recoverable deformation are investigated. A generalized dynamic model of a technical mechanism based on the elements with SME is developed. The model formally describes adaptive control of mechanism, based on which, the adaptation algorithms can be synthesized. The developed models can be used in the calculation and design of various thermomechanical drives and actuators, heat regulators, thermal compensators and damping devices based on elements from shape memory alloys, as well as in a synthesis of adaptive control algorithms of continuous and discrete classes in the terminal control, homing guidance and stabilization modes.

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Determination of spring elements characteristics using shape memory effect during thermomechanical impact

Cited by 2 publications

References 0 publications

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Improving the Models of Dynamics of Adaptively Controlled Elements and Drives Based on Functional Materials

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