Mechanical design of bimaterial helical springs with circular cross-section

Dragoni, Eugenio; Bagaria, William J.

doi:10.1177/0309324711400968

Cited by 13 publications

(26 citation statements)

References 3 publications

(12 reference statements)

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“…The numerical work was devoted to verifying the correctness of the stress concentration factor (equations (2) and (5)) or, equivalently, the curves in Figure 3. To this aim, a plane half turn of the spring was analysed by FEs for three spring indices (c = 3, 5, 10) and three section configurations: homogeneous solid section, bimaterial solid section and thin hollow section.…”

Section: Methodsmentioning

confidence: 99%

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Numerical and experimental validation of a theoretical model for bimaterial helical springs

Dragoni

Bagaria

2013

The Journal of Strain Analysis for Engineering Design

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This article deals with the numerical and experimental validation of a theoretical elastic model for bimaterial helical springs developed by the authors in a recently published article. The numerical validation is performed on finite element models involving one half turn of several springs identified by three spring indices (c=D/d= 3, 5, 10) and three section types (solid homogeneous, solid bimaterial and thin hollow). The experimental validation involves compression tests on two polymer (acrylonitrile butadiene styrene) spring configurations produced by rapid prototyping and cladded by ionic infiltration with CrNiCo alloy. For the larger prototype spring, the stresses are measured on the outside of the coil by means of miniature strain gauges. The numerical results confirm the theoretical stress concentration factors within an error of 5%. The experimental results closely agree with the predicted spring rates of all springs, either fully polymeric or bimaterial. In addition, the strain gauge measurements on the instrumented spring correlate well with the theoretical stresses calculated for that particular geometry

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Section: Methodsmentioning

confidence: 99%

“…As an example, consider a bimaterial spring with stainless steel casing and ABS core defined by the following parameters: G i = 770 N/mm 2 Tables 1 and 2, a stress ratio of 0.97 and a deflection ratio of 1.02 are retrieved, meaning that the maximum stress is underestimated by just 3% and the deflection is overestimated by a mere 2%.…”

Section: Theoretical Modelmentioning

confidence: 99%

Numerical and experimental validation of a theoretical model for bimaterial helical springs

Dragoni

Bagaria

2013

The Journal of Strain Analysis for Engineering Design

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“…For example, equivalent stiffness and stress relationship of coil spring was developed to approximate the multi-axial loadings, where strain and stress had a relationship referring to the elastic modulus [26]. This could be observed through a stress-strain analysis of coil spring using bi-material [27,28]. The analysis proposed the strain and displacement relationship of coil spring where the concept of potential energy was used.…”

Section: Proposed Modelmentioning

confidence: 99%

Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment

Kong

Abdullah

Schramm

et al. 2019

Metals

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This paper presents the evaluation of the automobile coil-spring strain-displacement relationship for strain signals generation and fatigue life predictions. The development of a strain and spring vertical displacement relationship is significant because measuring vehicle wheel displacements and forces are complex and costly. Hence, there is a need to estimate the strain data using alternative measurement, such as vibration signals. In this analysis, strain and acceleration data were collected from a vehicle that has travelled on different road conditions. Through the material elastic strain energy and spring potential energy relationship, a coil-spring parameterise strain-displacement relationship has been developed and evaluated using a scatter band and correlation approach. Using this proposed model, the strain time histories were obtained based on acceleration data. For fatigue life analysis, most of the predicted fatigue life was distributed in the acceptable range using the scatter band approach where the data correlated at coefficient of determination value (R2) of 0.8788. With a suitable correlation value, this analysis proposed an alternative strain generation method for suspension coil spring fatigue life prediction, which could significantly shorten the spring development time.

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“…[51][52][53] Another possible application is as a nanometal coating for polymer springs as exemplified by the work of Dragoni and Bagaria. 54,55 The Cu-Nb nanolayer coating strengthens and stiffens the polymer core of the spring and behaves as an in situ strain monitoring tool while in operation.…”

Section: Resistivity Of Multilayered Nanocompositesmentioning

confidence: 99%

Designing novel multilayered nanocomposites for high-performance coating materials with online strain monitoring capability

Ali

Radchenko

Zhou

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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Multilayered nanocomposites, known for its mechanical properties of very high flow strength, ultra-light weight and stable plastic flow to large strains, represent a class of novel composite nanomaterials in which there arises rare opportunities to design new materials from the ground up and to tailor their properties to suit exactly their performance requirements. These materials can withstand very high strains in the elastic regime without any inelastic relaxation due to plasticity or fracture compared to its bulk counterparts. This extended elastic regime opens up new possibilities for tuning the physical and chemical properties of materials as well as bringing novel functionalities, such as high performance coating materials with online strain monitoring capability. Our resistivity measurements during ex situ uniaxial micropillar compression in this article suggests basic feasibility of a Cu–Nb multilayered nanocomposite with 20 nm layer thickness having a novel functionality for online strain monitoring capability, in addition to its more known application as a high performance coating materials due to its extraordinary strength and deformability. A linear trend of resistivity with respect to true strain for strains in excess of 3.5% was observed and suggests a significant regime for use for strain sensor/detection/monitoring capability.

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Mechanical design of bimaterial helical springs with circular cross-section

Cited by 13 publications

References 3 publications

Numerical and experimental validation of a theoretical model for bimaterial helical springs

Numerical and experimental validation of a theoretical model for bimaterial helical springs

Evaluation of Energy-Based Model Generated Strain Signals for Carbon Steel Spring Fatigue Life Assessment

Designing novel multilayered nanocomposites for high-performance coating materials with online strain monitoring capability

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