Composite fiber materials are superior materials due to their high strength and light weight. Composites reflect the properties of their constituents, which is proportional to the volume fraction of each phase. There ...Composite fiber materials are superior materials due to their high strength and light weight. Composites reflect the properties of their constituents, which is proportional to the volume fraction of each phase. There are different fiber reinforcement types and each affects its flexural, tensile and compression strength. When selecting a composite for a specific application, the forces excreted on the composite must be known in order to determine the reinforcement type. Unidirectional fiber reinforcement will allow very strong load resistance but only in one direction where as a random orientated fiber reinforcement can resist less load but can maintain this quota in all directions. These materials are said to be anisotropic. Certain composite fibers, taking into consideration their weights, are physically stronger than conventional metals. In this paper, specific light-weight components with different reinforcement types, volume fraction and phase content were newly composed, tested, characterized and evaluated. By applying a novel method, a model which including the various matrix compositions, reinforcement types of each specific component, and its dual-properties was developed according to the structure characteristics. It was shown that certain reinforced composites such as carbon fiber, tend to be much stronger than metals when taking account its weight ratio. The outcome of this research lays a good foundation for the further carbon fiber-based material design work.展开更多
Although Dahongshan Copper Mine, a subsidiary of Chinalco Co., Ltd., has a large production scale, it is still a non-ferrous metal underground mine with low mechanization and labor efficiency due to its early producti...Although Dahongshan Copper Mine, a subsidiary of Chinalco Co., Ltd., has a large production scale, it is still a non-ferrous metal underground mine with low mechanization and labor efficiency due to its early production. In recent years, mines have carried out a large number of beneficial scientific explorations and practices on production safety management. According to their own actuality, they have combined production safety with scientific management. They have done meticulously and solidly, ensuring that the safety situation continues to be good. There have been no serious injury accidents, let alone work-related accidents for two consecutive years. The injury rate of thousands of people is in the good results within the control index have also made it a benchmark for safety management in the nonferrous mines of Chinalco. This paper analyzes and discusses the scientific methods and good experiences of the production safety of Dahongshan Copper Mine from six aspects: explosion management, organizational security, infrastructure, safety inspection and quantitative mechanism, safety training, safety science and technology, etc. Finally, it gives suggestions for the next production safety of Dahongshan Copper Mine.展开更多
文摘Composite fiber materials are superior materials due to their high strength and light weight. Composites reflect the properties of their constituents, which is proportional to the volume fraction of each phase. There are different fiber reinforcement types and each affects its flexural, tensile and compression strength. When selecting a composite for a specific application, the forces excreted on the composite must be known in order to determine the reinforcement type. Unidirectional fiber reinforcement will allow very strong load resistance but only in one direction where as a random orientated fiber reinforcement can resist less load but can maintain this quota in all directions. These materials are said to be anisotropic. Certain composite fibers, taking into consideration their weights, are physically stronger than conventional metals. In this paper, specific light-weight components with different reinforcement types, volume fraction and phase content were newly composed, tested, characterized and evaluated. By applying a novel method, a model which including the various matrix compositions, reinforcement types of each specific component, and its dual-properties was developed according to the structure characteristics. It was shown that certain reinforced composites such as carbon fiber, tend to be much stronger than metals when taking account its weight ratio. The outcome of this research lays a good foundation for the further carbon fiber-based material design work.
文摘Although Dahongshan Copper Mine, a subsidiary of Chinalco Co., Ltd., has a large production scale, it is still a non-ferrous metal underground mine with low mechanization and labor efficiency due to its early production. In recent years, mines have carried out a large number of beneficial scientific explorations and practices on production safety management. According to their own actuality, they have combined production safety with scientific management. They have done meticulously and solidly, ensuring that the safety situation continues to be good. There have been no serious injury accidents, let alone work-related accidents for two consecutive years. The injury rate of thousands of people is in the good results within the control index have also made it a benchmark for safety management in the nonferrous mines of Chinalco. This paper analyzes and discusses the scientific methods and good experiences of the production safety of Dahongshan Copper Mine from six aspects: explosion management, organizational security, infrastructure, safety inspection and quantitative mechanism, safety training, safety science and technology, etc. Finally, it gives suggestions for the next production safety of Dahongshan Copper Mine.
