The design of durability tests by fatigue damage spectrum approach

Cianetti, Filippo; Alvino, A.; Bolognini, A.; Palmieri, Massimiliano; Braccesi, Claudio

doi:10.1111/ffe.12686

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…Based on the Rossow sampling principle, each road condition was tested three times, and the most stable result of the three groups was selected as the expected signal of virtual iteration. Because of the impact vibration of road roughness in the test site and the electromagnetic interference of vehicle related wiring harness, the signals collected at first cannot be directly used for virtual iteration, and corresponding signal processing is required [15]. The signal consistency check was carried out and maximum acceleration at the lower end of the airbag was around 10 g, which was in line with the expected extent, and the acceleration response distribution was consistent.…”

Section: Signal Acquisition and Processingmentioning

confidence: 90%

Lightweight Design of Commercial Vehicle Cab Based on Fatigue Durability

Li¹,

Tian²,

Shi³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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To better improve the lightweight and fatigue durability performance of the tractor cab, a multi-objective lightweight design of the cab was carried out in this study. First, the finite element model of the cab with counterweight loading was established and then confirmed by the physical testing, and use the inertial relief method to obtain stress distribution under unit load. The cab-frame rigid-flexible coupling multi-body dynamics model was built by Adams/car software. Taking the cab airbag mount displacement and acceleration signals acquired on the proving ground as the desired signals and obtaining the fatigue analysis load spectrum through Femfat-Lab virtual iteration. The fatigue simulation analysis is performed in nCode based on the Miner linear fatigue cumulative damage theory. Then, with the mass and fatigue damage values as the optimization objectives, the bending-torsional stiffness and first-order bending-torsional mode as constraints, the thickness variables are screed based on the sensitivity analysis. The experimental design was carried out using the Optimal Latin hypercube method, and the multi-objective optimal design of the cab was carried out using the Kriging approximation model fitting and particle swarm algorithm. The weight of the optimized cab is reduced by 7.8% on the basis of meeting the fatigue durability performance. Finally, a seven-axis road simulation test rig was designed to verify its fatigue durability. The results show the optimized cab can consider both lightweight and durability.

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Section: Signal Acquisition and Processingmentioning

confidence: 90%

Lightweight Design of Commercial Vehicle Cab Based on Fatigue Durability

Li¹,

Tian²,

Shi³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

View full text Add to dashboard Cite

show abstract

“…where m is the total number of counted cycles, D p the cumulated damage [16]. Subscript p is used to remember that the damage, not being calculated necessarily starting from a stress value, is potential damage [22] and [23], very useful for comparative analysis but not to be analysed as the absolute value of the real damage Another definition, useful to better understand the subsequent steps proposed by the method object of the present paper, is that of damage equivalent signal (DES) [5], often used in the field of wind engineering.…”

Section: Time Domain Fatigue Analysismentioning

confidence: 99%

How to Experimentally Monitor the Fatigue Behaviour of Vibrating Mechanical Systems?

Cianetti

2020

SV-JME

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Fatigue damage and, in general, fatigue behaviour is not simple to observe or estimate during the operational life of a generic vibrating mechanical system. There are a lot of theoretical or numerical methods that allow to evaluate it or by knowing a priori the loading conditions and obtaining output stress states by adopting numerical models of the mechanical system or by directly experimentally measuring and acquiring stress/strain states. A few examples of instruments (e.g. rain flow recorders) or measurement chains dedicated to estimate it in time domain or frequency domain are found in the literature but none that fully both observes the system dynamic behaviour and estimates the related actualized cumulated damage, and, thus, none that can estimate the residual life of the system itself. In this paper, a simple time-domain method, designed to monitor the instantaneous fatigue behaviour by definition of the instantaneous and cumulated potential damage or of equivalent damage signal amplitude is presented, based on rain-flow counting method and a damage linear cumulation law and starting from system dynamics signals. This methodology was designed to overestimate real damage to alert the system manager before any crack starts and to be simply translated into electronic boards that can be mounted on generic mechanical systems and linked to one of the sensors that usually monitor system functionality. Keywords: fatigue; damage; rain flow counting; random loads

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“…However, up to now, it was usually considered for isotropic materials, and rarely was discussed in terms of durability up to the crack initiation stage. There is a noticeable increase in interest in the frequency domain fatigue life estimation methods, as can be noticed by the number of publications related to this area published in the recent years by the research groups of Benasciutti et al [3,4], Cianetti et al [5,6], and Slavic et al [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Estimation with Mean Stress Effect Compensation for Lightweight Structures—The Case of GLARE 2 Composite

Böhm

Głowacka

2020

Polymers

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This paper describes the current state-of-the-art in fatigue life assessment for lightweight composite structures with the use of the frequency domain fatigue life calculation method. Random stationary gaussian loading signals have been generated and served in the process of fatigue calculation. The material information that is being used in the calculation process has been obtained from literature for the Glare 2 composite. The effect of nonzero mean stress and different fiber orientations have been taken into account. The calculations have been performed for two mean stress compensation models by Goodman and Gerber. The proposed procedure gives satisfying results for the high-cycle fatigue region for Goodman and an overall good comparison in both regimes for the Gerber model.

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The design of durability tests by fatigue damage spectrum approach

Cited by 21 publications

References 19 publications

Lightweight Design of Commercial Vehicle Cab Based on Fatigue Durability

Lightweight Design of Commercial Vehicle Cab Based on Fatigue Durability

How to Experimentally Monitor the Fatigue Behaviour of Vibrating Mechanical Systems?

Fatigue Life Estimation with Mean Stress Effect Compensation for Lightweight Structures—The Case of GLARE 2 Composite

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