ANALYSIS OF THE EFFECT OF THE UNSTRESSED SPRING BODY LENGTH OF HELICOIDAL TENSION SPRING IN THE FORCE REQUIRED TO REACH THE YIELD POINT OF THE SPRING
Explore the relationship between the unstressed spring body length of helicoidal tension springs and the force required to reach their yield points for springs of 5 cm, 10 cm and 15 cm.
Recognising the important role of springs in modern society and identifying the obstacles faced by engineers due to the absence of an equation that determines the unstressed spring body length to the forced required to reach the yield point.
- Clamp sergeant (1);
- Coffee grinder (1);
- Digital dynamometer, Instrutherm DD-300 (1) ±0.1 N;
- Digital pachymeter (1) ±0.005 cm;
- Double sided tape (1);
- Drill (1);
- Hook (2);
- Nylon wire (150 cm);
- Ruler (150 cm) ±0.05 cm;
- Tension spring of unstressed spring body 5 cm (25);
- Tension spring of unstressed spring body 10 cm (25);
- Tension spring of unstressed spring body 15 cm (25);
- Transparent tape (1);
- Wooden Blocks (6 cm x 50 cm x 15 cm) (4);
- Wooden plate (170 cm x 50 cm x 3 cm);
- Wooden plate (10 cm x 50 cm x 3 cm);
The digital dynamometer gauge and the coffee grinder were positioned on opposite sides of the ruler, aligning with it. Subsequently, the nylon cord was affixed to the coffee grinder and a hook. Then, the spring under examination was suspended between the digital dynamometer gauge and the hook of the nylon cord. In turn, the coffee grinder was employed to tension the spring, applying a specified force that was being measured by the dynamometer. The applied forces were 50, 52, 54, 56, and 58 N. Each force was applied to 5 different springs for each spring length.
The force required to reach the yield point is independent of the unstressed spring body length of helicoidal tension springs. The obtained results are supported by Marcos G. D. Bortoli et al. 2017 and by Douglas C. Giancoli et al. 2009.
References:
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- Associated Spring. Engineering Guide to Springs. Associated Spring, 2021.
- Barra, Michael E. M. Projeto E Análise Dinâmica Das Molas Helicoidais Da Suspensão De Um Veículo Baja. 2018. Universidade Federal Do Rio Grande Do Norte, Final Undergraduate Paper.
- Giancoli, Douglas C. Physics for Scientists & Engineers. Pearson Education, Inc., 2009.
- Oberg, Erik, and Hnery H. Ryffel. Machinery's Handbook: A Reference Book for the Mechanical Engineer, Designer, Manufacturing Engineer, Draftsman, Toolmaker, and Machinist. Industrial Press, Inc., 1992.
- Avallone, Eugene A., and Theodore Baumeister III. Mark's Standard Handbook For Mechanical Engineering. McGRAW-HILL, 1996.
- Bortoli, Marcos G. D. Análise De Tensões E Da Fadiga Em Molas Helicoidais. 2017. Universidade Do Estado De Santa Catarina, PhD Thesis.
- Bloise, Tamires. "A Importância Dos Ensaios Mecânicos De Tração e Compressão." Liga Consultoria, 24 Jul. 2018, www.ligaconsultoriajr.com.br/post/ensaio-tracao-compressao.
- The Editors of Encyclopedia Britannica. "Stress." Encyclopedia Britannica, 11 Jun. 2023, www.britannica.com/science/stress-physics.
- Tan, Vina P. S., Farid, Ali A., Karimzadeh, Atefeh, Koloor, Seyed S. R., Petru, Michael, et al. "Investigation on the Curvature Correction Factor of Extension Spring." Materials, 2020, https://doi.org/10.3390/ma13184199.
- Society of Automotive Engineers. Spring Design Manual. Society of Automotive Engineers, 1995.
- Mugrauer, Jürgen. "Spring Steel Wires and Their Properties." Gutekunst Federn, 28 May 2021, blog.federnshop.com/en/spring-steel-wires-and-their-properties/.
By: Gustavo Palhares - Supervisor: Leonardo Trevisan - Coree International School
Unstressed Spring Body Length (±2.5 mm) | Wire Diameter (± 0.025 mm) | Mean Diameter (± 0.050 mm) | |
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Characteristics of the Springs