Thermomechanical Analysis on Ti-Ni Shape Memory Helical Springs Under Cyclic Tensile Loads

Oliveira, Carlos Augusto do Nascimento; Gonzalez, Cézar Henrique; Filho, Oscar Olímpio de Araújo; Silva, Niédson José da; Guimarães, Pablo Batista; Nuñez-Mendoza, Esau; Cuéllar, Enrique Manuel López

doi:10.1590/1516-1439.334514

Cited by 4 publications

(6 citation statements)

References 26 publications

(33 reference statements)

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“…Our review of the literature [5,6] showed that the rational temperature range for the endurance of spring elements with SME ranges from 400-500 °C. In the studies, heating was carried out to a temperature of 420 °C.…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

“…A significant influence of the cooling rate on the deformation-strength characteristics is observed under the deformation mode at the temperature t ≤ М f . At the same time, in contrast to [5,6], it was established that an increase in the cooling rate from 0.013 to 66.7 °C/s leads to an increase in the force required to induce deformation in the martensitic state by 40 % (Fig. 3).…”

Section: Improvement Of the Steam Trap Designmentioning

confidence: 97%

“…Papers [5,6] report the results of studying the effect of thermal-force cycling (TFC) on the thermoelastic properties of springs with a shape memory effect (SME). The method of differential scanning calorimetry was used to study the structure of the spring material.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Taking into account the results of research (Fig. 4, 6) and data from the literature [5,6,13], a rational technological process of heat treatment of spring elements includes the following components:…”

Section: Improvement Of the Steam Trap Designmentioning

confidence: 99%

“…-heating to a temperature of 400-500 °C for 1 hour [5,6]; -exposure at this temperature for 1 hour [13]; -cooling at a rate of 0.013 °C/s (Fig. 4); -thermal-force cycling of spring elements with the number of cycles at least 100 and a winding pitch of 8 •10 -3 m (Fig.…”

Section: Improvement Of the Steam Trap Designmentioning

confidence: 99%

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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: The Study Materials and Methodsmentioning

confidence: 99%

Section: Improvement Of the Steam Trap Designmentioning

confidence: 97%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Improvement Of the Steam Trap Designmentioning

confidence: 99%