Estimation of air-spring life based on accelerated experiments

Oman, Simon; Fajdiga, Matija; Nagode, Marko

doi:10.1016/j.matdes.2010.03.044

Cited by 28 publications

(61 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6,10 Because both materials are hyperelastic, the Marlow hyperelastic material model was fitted to the experimental stress strain curve for both materials. The critical element of all air springs is the flex member.…”

Section: Fe Modelmentioning

confidence: 99%

“…With increasing and decreasing piston diameter, the air spring's effective diameter D eff is increased or decreased. Stresses can be determined using finite element analysis [5][6][7][8][9][10] hence, the design and operating conditions of an air spring can be changed using simulations to determine changes in the maximum , lever eccentricity; e p , eccentricity; h, height; h d , design height; IT, number of interactions; l, lever length; LV, number of levels; n, number of experiments; p, air pressure; R, stress ratio; T, quality characteristic average; y i , quality characteristic; α, inclination; ϑ, temperature; ϑ 0 , absolute zero temperature; b μ, prediction average; σ acp , stress amplitude calculated with critical plane approach; σ x , stress in the x direction; σ y , stress in the y direction; τ xy , shear stress; ϕ, cord angle stress. This progressive spring stiffness characteristic allows a similar amount of comfort whether the vehicle is fully loaded or empty.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Determining influential factors for an air spring fatigue life

Bešter

Oman

Nagode

2018

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

This paper presents an analysis of factors essential to air spring and undercarriage design to determine their influence on air spring fatigue life. Two sets of factors were chosen for the investigation: those relating to the design of the air spring itself (cord angle, diameter difference) and those relating to the design of the undercarriage (lever length, eccentricity, lever eccentricity, inclination). A full factorial experiment, whereby interactions between all the factors are investigated, would demand 729 experiments. Using Taguchi methods, the number of experiments required is dramatically reduced, using only 27 experiments to determine the influence of 6 factors and 3 interactions. Taguchi analysis shows here that factors inherent to air spring design have a much greater influence on fatigue life than those factors inherent to undercarriage design. Interaction between these factors has also revealed that there is no optimal cord angle for all air springs.

show abstract

Section: Fe Modelmentioning

confidence: 99%

mentioning

confidence: 99%

Determining influential factors for an air spring fatigue life

Bešter

Oman

Nagode

2018

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…8 The details regarding the finite element model are depicted in Appendix A. Hyper-elastic rubber properties were simulated by a multi-linear elastic material model, whilst the cord reinforcement material was simulated by a linear orthotropic material model. The rubber composite of the bellows was modelled as a layered composite with two layers of nylon fibre material and three layers of rubber material.…”

Section: Examplementioning

confidence: 99%

“…8 Evaluation of this method showed 8,18 that the critical plane approach gives satisfactory results when compared with experimental observations. For example, those calculations based on signed von Mises stress have proved 8 inadequate since the first and the third principal stresses in absolute size can be alike.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Continuous fatigue damage prediction of a rubber fibre composite structure using multiaxial energy‐based approach

Gosar

Nagode

Oman

2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

This paper details an advanced method of continuous fatigue damage prediction of rubber fibre composite structures. A novel multiaxial energy‐based approach incorporating a mean stress correction is presented and also used to predict the fatigue life of a commercial vehicle air spring. The variations of elastic strain and complementary energies are joined to form the energy damage parameter. Material parameter α is introduced to adapt for any observed mean stress effect as well as being able to reproduce the well‐known Smith‐Watson‐Topper criterion. Since integration to calculate the energies is simplified, the approach can be employed regardless of the complexity of the thermo‐mechanical load history. Several numerical simulations and experimental tests were performed in order to obtain the required stress‐strain tensors and the corresponding fatigue lives, respectively. In simulations, the rubber material of the air spring was simulated as nonlinear elastic. The mean stress parameter α, which controls the influence of the mean stress on fatigue life, was adjusted with respect to those energy life curves obtained experimentally. The predicted fatigue life and the location of failure are in very good agreement with experimental observations.

show abstract

Fatigue assessment of cord rubber composite air spring bellows based on specimen testing and numerical analysis

Torggler,

Faethe,

Müller

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

Rail vehicle air spring bellows consisting of cord rubber composites are subject to a wide variety of stresses. It is therefore crucial to understand the fatigue behavior of such components, as the development process involves the use of empirical methods, which are both time‐consuming and costly. This paper outlines a methodology for assessing the fatigue strength of air spring bellows through representative specimen testing. Ten component tests and a validated numerical model of the air spring bellows are presented. The primary loading scenario investigated in this study is pure pulsating tensile stress with a strain ratio R in the range of 0–0.25. This scenario is considered to be highly damaging, leading to delamination. Comprehensive damage analysis of the specimen is performed using microcomputed tomography. To ensure the transferability of the results, a failure criterion is defined as 20% elongation of the specimen, based on the defined 10% internal pressure drop for the bellow. After statistical evaluation, the transferability of the specimen tests to the component is validated using a local fatigue approach. The correlation coefficient R2 is 0.84, indicating a sound agreement between model and tests with 7 points out of 10 within a scatter factor of 2.

show abstract

Estimation of air-spring life based on accelerated experiments

Cited by 28 publications

References 7 publications

Determining influential factors for an air spring fatigue life

Determining influential factors for an air spring fatigue life

Continuous fatigue damage prediction of a rubber fibre composite structure using multiaxial energy‐based approach

Fatigue assessment of cord rubber composite air spring bellows based on specimen testing and numerical analysis

Contact Info

Product

Resources

About