Fatigue crack growth rate test using a frequency sweep method

Zhou, Xun; Yu, Xin

doi:10.1631/jzus.a0720009

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…For the components made of these kinds of materials, usually, an obvious fatigue crack propagation phenomenon can be found during the fatigue failure process. Therefore, the remaining fatigue life in this paper can be defined as the number of fatigue load cycles between the given time node and the time node at the limit fatigue crack length [27,28].…”

Section: Methods 21 the Acceleration Methodsmentioning

confidence: 99%

“…In a previous study, we applied the combined finite element analysis and vibration approach to determine the crack growth process throughout the whole experimental period. The main principle of this method is that during the fatigue loading process, the crack propagation will result in a reduction in the system stiffness, which is the primary cause of the inherent frequency reduction in the system [27,28]. So, the length and the width of the crack surface can be determined indirectly by checking the vibration property of the system at the specified time node.…”

Section: The Fatigue Crack Determination Methodsmentioning

confidence: 99%

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Crankshaft High-Cycle Bending Fatigue Experiment Design Method Based on Unscented Kalman Filtering and the Theory of Crack Propagation

Que,

Jiang,

Sun

et al. 2023

Materials

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The high-cycle bending fatigue experiment is one of the most important necessary steps in guiding the crankshaft manufacturing process, especially for high-power engines. In this paper, an accelerated method was proposed to shorten the time period of this experiment. First, the loading period was quickened through the prediction of the residual fatigue life based on the unscented Kalman filtering algorithm approach and the crack growth speed. Then, the accuracy of the predictions was improved obviously based on the modified training section based on the theory of fracture mechanics. Finally, the fatigue limit load analysis result was proposed based on the predicted fatigue life and the modified SAFL (statistical analysis for the fatigue limit) method. The main conclusion proposed from this paper is that compared with the conventional training sections, the modified training sections based on the theory of fracture mechanics can obviously improve the accuracy of the remaining fatigue life prediction results, which makes this approach more suitable for the application. In addition, compared with the system’s inherent natural frequency, the fatigue crack can save the experiment time more effectively and thus is superior to the former factor as the failure criterion parameter.

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Section: Methods 21 the Acceleration Methodsmentioning

confidence: 99%

Section: The Fatigue Crack Determination Methodsmentioning

confidence: 99%

Crankshaft High-Cycle Bending Fatigue Experiment Design Method Based on Unscented Kalman Filtering and the Theory of Crack Propagation

Que,

Jiang,

Sun

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…The long-term storage in the body, damage the internal organs qi, aggravate the original deficiency.Prof. Zhou Enchao [16] believed that protecting the kidney energy and balancing the yin and yang of the internal organs are the criteria for diagnosis and treatment, but the "poisonous evil" always runs through the disease, and the combination of tonicity and detoxification should be used regardless of the stage of the disease. Therefore, we advocate that the treatment should follow the principle of "to be peaceful for a period of time", "balance" throughout the treatment, taking into account all organs, harmonizing yin and yang, treating both the symptoms and the root cause, and combining both the general and the astringent aspects, with tonicity as the mainstay and generalization as the use, complementing each other, in order to be effective.…”

Section: Dialectical Treatment From "Pingzhi In Power and Balance Rem...mentioning

confidence: 99%

Differentiation and Treatment of Chronic Renal Failure Based on the Theory of "Peace and Balance"

2023

IJFM

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Chronic renal failure is slow, the course of disease is long, and it is difficult to heal. At present, modern medicine is faced with many difficulties in treatment, and it is difficult to break through. The Chinese medicine treats the symptoms according to the whole concept and has obtained good curative effect. Although the pathogenesis of the disease is complicated, in the whole process of onset, deficiency in origin and excess in superficiality is still the most critical. It is often caused by deficiency of spleen and kidney, disorder of liver ascending and lung descending, combined with phlegm-dampness and stasis toxin, and the disturbance of internal and external wind. Consequently. It is necessary to treat multiple viscera at the same time, and treat both manifestation and root cause of disease. The theory of "Peace and Balance" fully interprets the overall concept of Chinese medicine, we advocate "aim for peace" and Incorporate "balance" throughout the entire treatment,to reach the balance of yin and yang. Therefore, this article will discuss the treatment based on syndrome differentiation of Chronic renal failure by the theory of "Peace and Balance".

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Dynamic Investigation and Resonant Frequency Determination of Shaft Bending Fatigue Testing Machine

Zhao

Zhang

Jiang

2022

Shock and Vibration

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The testing machine of shaft bending fatigue is widely used to test the fatigue limit and life of various shaft-type parts in mechanical engineering. Machine dynamic characteristics and system bending resonant frequency are very important for the design, testing, and application of the testing machine, but existing complex finite element calculation and aimless large-range frequency scanning in testing are the available methods to solve these two problems helplessly and inefficiently. A novel analytical model of nonlinear coupling dynamic system is built for the fatigue testing machine in this paper. The nonlinear dynamic model is simulated and investigated numerically, then it is reasonably linearized and reduced as a linear one, and the corresponding error analysis and application range are presented. By using eigenvalue approximation, the shaft bending resonant frequency formula is obtained, then the formula is compared and verified with the results from the nonlinear system simulation and finite element software, and it can improve the machine design and testing efficiency obviously. The analytical dynamic modeling and linearizing, and the given mode resonant frequency approximating, also provide a reference for many similar vibration machines.

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Fatigue crack growth rate test using a frequency sweep method

Cited by 4 publications

References 9 publications

Crankshaft High-Cycle Bending Fatigue Experiment Design Method Based on Unscented Kalman Filtering and the Theory of Crack Propagation

Crankshaft High-Cycle Bending Fatigue Experiment Design Method Based on Unscented Kalman Filtering and the Theory of Crack Propagation

Differentiation and Treatment of Chronic Renal Failure Based on the Theory of "Peace and Balance"

Dynamic Investigation and Resonant Frequency Determination of Shaft Bending Fatigue Testing Machine

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