Research on Creep Test of Compacted Graphite Cast Iron and Parameter Identification of Constitutive Model under Wide Range of Temperature and Stress

Jing, Guoxi; Li, Shubo; Chen, Guang; Wei, Junchao; Sun, Shuhui; Jun-hai, Zhao

doi:10.3390/app12105032

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…The core idea of constructing an empirical creep model is to find out the relationship between the input variable (independent variable) and output variable (dependent variable) and establish a corresponding mathematical model by combining engineering practice and test data. According to reference [19], the relationship between stress, strain, and time in the creep constitutive model can be written as follows:…”

Section: Empirical Creep Model Theorymentioning

confidence: 99%

Investigation of an Empirical Creep Constitutive Model of Changsha Red Loam

Long

2023

Buildings

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To describe and predict the creep deformation of Changsha red loam (including sandy soil and silty clay) in China, an empirical creep model was proposed based on a laboratory consolidation compression test. Two classical soil layers were sampled from the deep foundation pit site and fourteen samples were designed for tests under different loading conditions. Results show that the deformation process illustrates deceleration and stabilization creep with its vertical load lower than 500 kPa, while it may illustrate acceleration with its vertical load higher than 500 kPa. By analyzing the experimental results, the empirical creep model of the red loam was established. Adopting the model to predict the deformation of red loam shows the prediction curves match the actual situation, proving that the model plays a significant role in predicting the creep deformation of Changsha red loam.

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Section: Empirical Creep Model Theorymentioning

confidence: 99%

Investigation of an Empirical Creep Constitutive Model of Changsha Red Loam

Long

2023

Buildings

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“…The average number of accident-free transitions during the standard period is determined by formula (6). The average number of transitions for the established period between factory repairs is based on statistical information about the operating experience.…”

Section: Source: Author's Developmentmentioning

confidence: 99%

Determining the probability of failure of marine diesel engine parts

Ivanov¹,

Polyansky²

2022

UBSRAS

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Maritime transportation is the essence of the international economy. Today, about ninety percent of world trade is carried out by sea through 50,000 merchant ships. Most of these vessels are powered by mainline diesel engines due to their reliability and fuel efficiency. Reliability of system elements in general depends on random failures, significant wear during operation, additional wear during start-up. Accidental damage to diesel engine components is a major hazard during operation, as some parts (such as cylinder liners and pistons) are usually replaced during repairs. On the other hand, preventive service does not eliminate random malfunctions. Therefore, in the general problem of assessing the reliability of a diesel engine, there is a mathematical problem of assessing the reliability and durability, taking into account only the random failures of its elements, which are of the greatest practical importance. The purpose of the work is a mathematical study of the reliability of parts of the cylinder-piston group of the main engines of dry cargo ships. Using a systematic approach and a probabilistic statistical method, it was established that the most common and difficult case is the simultaneous action on a system element (for example, a cylinder sleeve) of factors that cause wear during the period of operation (including during the start-up period) and accidental failures. It was determined that the quality of the cylinder-piston system in ships of the "Ostriv Rosiyskiy" type is higher than in the ships of the "Simferopol" and "Murom" types. Empirical formulas for estimating the probability of emergency failure of main engine system elements during the period of operation between factory repairs were obtained, where the main danger during the period of operation was carried by accidental failures. Based on the results of the study, it is possible to establish a schedule for the periodicity of maintenance of the ship's main engine and the cost of losses due to ship downtime due to failures, and can also be used in the reliability study of other types of ship's main engines. The results make it possible to determine the reliability of the parts of the cylinder-piston group of the main engines of dry cargo ships. and, in particular, to establish the maintenance schedule of the ship's main engine and the cost of damages due to ship downtime due to failures, and can also be used in the study of the reliability of other types of main engines of other series of ships

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“…We used the true stress creep model based on deformation mechanisms to predict the MCR, and obtained the prediction effect of 100% predicted value within a 5 times error band and 73% predicted value within a 2 times error band. 16 Building upon the aforementioned work, this paper explores methods for achieving even more accurate predictions of MCR. This involves investigating the construction of the creep constitutive model and identifying model parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Our team has carried out the creep test of CGI in the temperature range of 723.15–823.15 K and the stress range of 100–300 MPa. We used the true stress creep model based on deformation mechanisms to predict the MCR, and obtained the prediction effect of 100% predicted value within a 5 times error band and 73% predicted value within a 2 times error band 16 . Building upon the aforementioned work, this paper explores methods for achieving even more accurate predictions of MCR.…”

Section: Introductionmentioning

confidence: 99%

Research on a creep constitutive model of compacted graphite cast iron and its parameter identification method

Jing,

Ma,

et al. 2024

Fatigue Fract Eng Mat Struct

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In order to accurately predict the minimum creep rate under the actual working conditions of compacted graphite cast iron cylinder head, this paper conducted creep experiments in the temperature range of 723.15–823.15 K and the stress range of 100–300 MPa. The creep damage evolution and damage mechanisms under test conditions were also analyzed. Then the data fitting performances were analyzed and compared from three aspects: the optimization‐seeking algorithm, the form of the objective function and the construction of the creep constitutive model. Finally, the chosen optimization algorithm combined with the proposed objective function and creep constitutive model resulted in 100% of the predicted values within the 3 times error band and 26.67% of the predicted values within the 1.5 times error band. This improves the prediction accuracy while reducing the effect of data overfitting.

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Research on Creep Test of Compacted Graphite Cast Iron and Parameter Identification of Constitutive Model under Wide Range of Temperature and Stress

Cited by 8 publications

References 39 publications

Investigation of an Empirical Creep Constitutive Model of Changsha Red Loam

Investigation of an Empirical Creep Constitutive Model of Changsha Red Loam

Determining the probability of failure of marine diesel engine parts

Research on a creep constitutive model of compacted graphite cast iron and its parameter identification method

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