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Open AccessArticle

Random Vibration Fatigue Analysis Using a Nonlinear Cumulative Damage Model

by Jesús M. Barraza-Contreras, Manuel R. Piña-Monarrez, Alejandro Molina and Roberto C. Torres-Villaseñor

Appl. Sci. 2022, 12(9), 4310; https://doi.org/10.3390/app12094310 - 24 Apr 2022

Cited by 9 | Viewed by 3630

Abstract

The paper’s content allowed us to determine the fatigue life of a component that is being subjected to a random vibration environment. Its estimation is performed in the frequency domain with loading frequencies being closer to the system’s natural frequency. From loads’ amplitude and their interaction effect, we derive a nonlinear damage model to cumulate the generated fatigue damage. The exponent value of 0.4 from the Manson–Halford curve damage model was replaced by a vibration bending stress relation that considers the effect and interaction of loads. The analysis is performed from a progressive accelerated vibration spectrum to predict the fatigue life estimation. From this accelerated scenario, the accelerated coefficients and cumulated damage are both determined. The proposed nonlinear model is based on the following facts: (1) vibration and bending stress

σ_{v b}

values are obtained from the response acceleration of power spectral density (PSD) applied and (2) the model can be applied to any mechanical component analysis where the corresponding acceleration responses

A_{r e s}

and the dynamic load factor

σ_{d y n a m i c}

values are known. The steps to determine the expected fatigue damage accumulation D by using the curve damage are given. Full article

(This article belongs to the Topic Fatigue and Fracture Assessment of Structural Components and Materials)

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11 pages, 1426 KiB

Open AccessArticle

Fatigue Design of Steel Bridge Deck Asphalt Pavement Based on Nonlinear Damage Accumulation Theory

by Xunqian Xu, Yu Li, Wei Huang, Dakai Chen, Chen Zhang and Wenkang Shi

Appl. Sci. 2021, 11(12), 5668; https://doi.org/10.3390/app11125668 - 18 Jun 2021

Cited by 3 | Viewed by 2139

Abstract

Based on the nonlinear damage theory, this paper aims to explore the fatigue performance of steel bridge deck asphalt pavement under multistage fatigue load. Manson–Halford cumulative damage model and the modified model were introduced to describe loading sequence effects, and interactions between multiple loads were represented in stress ratio. The fatigue life prediction method of steel bridge deck asphalt pavement was put forward, considering loading sequence effects and load interactions. The fatigue design of steel bridge deck asphalt pavement was investigated with the fatigue life prediction model. The effects of different load levels and loading sequence on the fatigue design parameters stress ratio of steel bridge deck asphalt pavement were studied. The design results were compared with experimental results, and the prediction results were based on traditional Miner’s theory. The analysis results showed that the fatigue life prediction method based on the nonlinear cumulative damage theory can effectively design and analyze the fatigue characteristics of asphalt pavement of steel bridge deck with high accuracy and reliability. The fatigue life prediction model of steel bridge deck asphalt pavement can well reflect loading sequence effects and load interactions. In addition, the design model has relatively few parameters; therefore, it can be applied to practical engineering design. Full article

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15 pages, 4745 KiB

Open AccessArticle

A Combined High and Low Cycle Fatigue Model for Life Prediction of Turbine Blades

by Shun-Peng Zhu, Peng Yue, Zheng-Yong Yu and Qingyuan Wang

Materials 2017, 10(7), 698; https://doi.org/10.3390/ma10070698 - 26 Jun 2017

Cited by 116 | Viewed by 10041

Abstract

Combined high and low cycle fatigue (CCF) generally induces the failure of aircraft gas turbine attachments. Based on the aero-engine load spectrum, accurate assessment of fatigue damage due to the interaction of high cycle fatigue (HCF) resulting from high frequency vibrations and low cycle fatigue (LCF) from ground-air-ground engine cycles is of critical importance for ensuring structural integrity of engine components, like turbine blades. In this paper, the influence of combined damage accumulation on the expected CCF life are investigated for turbine blades. The CCF behavior of a turbine blade is usually studied by testing with four load-controlled parameters, including high cycle stress amplitude and frequency, and low cycle stress amplitude and frequency. According to this, a new damage accumulation model is proposed based on Miner’s rule to consider the coupled damage due to HCF-LCF interaction by introducing the four load parameters. Five experimental datasets of turbine blade alloys and turbine blades were introduced for model validation and comparison between the proposed Miner, Manson-Halford, and Trufyakov-Kovalchuk models. Results show that the proposed model provides more accurate predictions than others with lower mean and standard deviation values of model prediction errors. Full article

(This article belongs to the Special Issue The Life of Materials at High Temperatures)

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