With the development of modern industry and ever more complex structural loads,the possibility of fatigue failure is increasing.Fatigue analysis can be used to evaluate the service life of components and reduce the pr...With the development of modern industry and ever more complex structural loads,the possibility of fatigue failure is increasing.Fatigue analysis can be used to evaluate the service life of components and reduce the probability of accidents.Therefore,the development and application of fatigue-analysis technology have important research significance.This paper collects information from a wide field of literature and summarizes the current status of fatigue-analysis research.It covers related theoretical knowledge,fatigue-life prediction methods,and fatigue design methods and their application scenarios,and it summarizes the challenges and research hotspots in the field.On the basis of this examination,future development directions of fatigue-life prediction methods are proposed.The conclusions will have a certain guiding role in the development of fatigue-analysis methods.展开更多
The coastal area of China has faced major strategic planning and environmental pollution,including heavy metals pollution.This study aimed to provide a comprehensive evaluation of the effects of Cd pollution on the ec...The coastal area of China has faced major strategic planning and environmental pollution,including heavy metals pollution.This study aimed to provide a comprehensive evaluation of the effects of Cd pollution on the ecology in coastal areas of China.A soil Cd pollution database of 300 counties or districts in coastal areas was screened from academic dissertations and academic journal papers.Based on the database,the ecological risk was evaluated using entropy methods and probabilistic ecological risk assessment(PERA),and the advantages and disadvantages of these methods were analyzed.In China’s coastal areas,the soil Cd content in 10.33%of the counties was higher than the minimum of risk control value(1.5 mg/kg),and in 4.00%of the counties was higher than the maximum of risk control value(4.0 mg/kg).The ecological risks were highly compatible with national strategic planning areas.Guangxi Province,Zhejiang Province,and Guangdong Province ranked among the top three coastal areas for soil Cd contamination,and the ecological risks were 18.80%,17.89%,and 15.77%at the maximum no-effect concentration/lowest effect concentration(NOEC/LOEC)level.This study can provide insights to policymakers regarding the protection of ecosystems threatened by heavy metals in the process of regional strategic planning.展开更多
基金financially supported by China Postdoctoral Science Foundationthe National Natural Science Foundation of China(Grant No.51705132)+1 种基金the Natural Science Project of Henan Provincial Department of Science and Technology(Grant No.222102220088)the Natural Science Project of Henan Provincial Department of Education(Grant No.21A460006)。
文摘With the development of modern industry and ever more complex structural loads,the possibility of fatigue failure is increasing.Fatigue analysis can be used to evaluate the service life of components and reduce the probability of accidents.Therefore,the development and application of fatigue-analysis technology have important research significance.This paper collects information from a wide field of literature and summarizes the current status of fatigue-analysis research.It covers related theoretical knowledge,fatigue-life prediction methods,and fatigue design methods and their application scenarios,and it summarizes the challenges and research hotspots in the field.On the basis of this examination,future development directions of fatigue-life prediction methods are proposed.The conclusions will have a certain guiding role in the development of fatigue-analysis methods.
基金This work was supported by the National Natural Science Foundation of China[41901255]Strategic Priority Research Program of the Chinese Academy of Science[XDA20010303].
文摘The coastal area of China has faced major strategic planning and environmental pollution,including heavy metals pollution.This study aimed to provide a comprehensive evaluation of the effects of Cd pollution on the ecology in coastal areas of China.A soil Cd pollution database of 300 counties or districts in coastal areas was screened from academic dissertations and academic journal papers.Based on the database,the ecological risk was evaluated using entropy methods and probabilistic ecological risk assessment(PERA),and the advantages and disadvantages of these methods were analyzed.In China’s coastal areas,the soil Cd content in 10.33%of the counties was higher than the minimum of risk control value(1.5 mg/kg),and in 4.00%of the counties was higher than the maximum of risk control value(4.0 mg/kg).The ecological risks were highly compatible with national strategic planning areas.Guangxi Province,Zhejiang Province,and Guangdong Province ranked among the top three coastal areas for soil Cd contamination,and the ecological risks were 18.80%,17.89%,and 15.77%at the maximum no-effect concentration/lowest effect concentration(NOEC/LOEC)level.This study can provide insights to policymakers regarding the protection of ecosystems threatened by heavy metals in the process of regional strategic planning.
