Necking of stubby micro-films of aluminum is investigated numerically by considering tension of a specimen with an initial imperfection used to onset localisation. Plastic anisotropy is represented by two different yi...Necking of stubby micro-films of aluminum is investigated numerically by considering tension of a specimen with an initial imperfection used to onset localisation. Plastic anisotropy is represented by two different yield criteria and strain-gradient effects are accounted for using the visco-plastic finite strain model. Furthermore, the model is extended to isotropic anisotropic hardening （evolving anisotropy）. For isotropic hardening plastic anisotropy affects the predicted overall nominal stress level, while the peak stress remains at an overall logarithmic strain corresponding to the hardening exponent. This holds true for both local and nonlocal materials. Anisotropic hardening delays the point of maximum overall nominal stress.展开更多
With the development of society and the progress of information science and technology, it has entered into the "Micro-Era". In the micro-era micro-film was born, micro film playback time is short, and the a...With the development of society and the progress of information science and technology, it has entered into the "Micro-Era". In the micro-era micro-film was born, micro film playback time is short, and the amount of investment in the production cycle is short, forming a unique advantage, and micro-film aesthetic acceptance characteristics are different from the traditional film, the audience's aesthetic acceptance of features has also changed accordingly. This paper analyzes the relationship between micro-film and micro-era, and analyzes the micro-film to change the aesthetic acceptance of the audience from the aesthetic acceptance, aesthetic needs, aesthetic psychology and aesthetic experience to analyze and summarize. Hope to be able to cause domestic and foreign micro-film-related researchers and practitioners of thinking, and strive to micro-film can be further develop.展开更多
The buckling design of micro-films has various potential applications to engineering.The substrate prestrain,interconnector buckling amplitude and critical strain are important parameters for the buckling design.In th...The buckling design of micro-films has various potential applications to engineering.The substrate prestrain,interconnector buckling amplitude and critical strain are important parameters for the buckling design.In the presented analysis,the buckled film shape was described approximately by a trigonometric function and the buckled film amplitude was obtained by minimizing the total strain energy.However,this method only generates the first-order approximate solution for the nonlinear buckling.In the present paper,an asymptotic analysis based on the rigorous nonlinear differential equation for the buckled micro-film deformations is proposed to obtain more accurate relationship of the buckling amplitude and critical strain to prestrain.The obtained results reveal the nonlinear relation and are significant to accurate buckling design of micro-films.展开更多
基金the Danish Technical Research Council in a project entitled Modeling Plasticity at the Micron Scale
文摘Necking of stubby micro-films of aluminum is investigated numerically by considering tension of a specimen with an initial imperfection used to onset localisation. Plastic anisotropy is represented by two different yield criteria and strain-gradient effects are accounted for using the visco-plastic finite strain model. Furthermore, the model is extended to isotropic anisotropic hardening （evolving anisotropy）. For isotropic hardening plastic anisotropy affects the predicted overall nominal stress level, while the peak stress remains at an overall logarithmic strain corresponding to the hardening exponent. This holds true for both local and nonlocal materials. Anisotropic hardening delays the point of maximum overall nominal stress.
文摘With the development of society and the progress of information science and technology, it has entered into the "Micro-Era". In the micro-era micro-film was born, micro film playback time is short, and the amount of investment in the production cycle is short, forming a unique advantage, and micro-film aesthetic acceptance characteristics are different from the traditional film, the audience's aesthetic acceptance of features has also changed accordingly. This paper analyzes the relationship between micro-film and micro-era, and analyzes the micro-film to change the aesthetic acceptance of the audience from the aesthetic acceptance, aesthetic needs, aesthetic psychology and aesthetic experience to analyze and summarize. Hope to be able to cause domestic and foreign micro-film-related researchers and practitioners of thinking, and strive to micro-film can be further develop.
基金Fundamental Research Funds for the Central Universities(2022JKF02006)Open Project of Key Laboratory of Drug Monitoring and Control,Ministry of Public Security(2023-KLDMC-02)。
基金supported by the National Natural Science Foundation of China (Grant Nos. 11002077 and 11072215)
文摘The buckling design of micro-films has various potential applications to engineering.The substrate prestrain,interconnector buckling amplitude and critical strain are important parameters for the buckling design.In the presented analysis,the buckled film shape was described approximately by a trigonometric function and the buckled film amplitude was obtained by minimizing the total strain energy.However,this method only generates the first-order approximate solution for the nonlinear buckling.In the present paper,an asymptotic analysis based on the rigorous nonlinear differential equation for the buckled micro-film deformations is proposed to obtain more accurate relationship of the buckling amplitude and critical strain to prestrain.The obtained results reveal the nonlinear relation and are significant to accurate buckling design of micro-films.
