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Fiber-reinforced composites in milling and grinding: machining bottlenecks and advanced strategies

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0680-8

Abstract: Fiber-reinforced composites have become the preferred material in the fields of aviation and aerospace because of their high-strength performance in unit weight. The composite components are manufactured by near net-shape and only require finishing operations to achieve final dimensional and assembly tolerances. Milling and grinding arise as the preferred choices because of their precision processing. Nevertheless, given their laminated, anisotropic, and heterogeneous nature, these materials are considered difficult-to-machine. As undesirable results and challenging breakthroughs, the surface damage and integrity of these materials is a research hotspot with important engineering significance. This review summarizes an up-to-date progress of the damage formation mechanisms and suppression strategies in milling and grinding for the fiber-reinforced composites reported in the literature. First, the formation mechanisms of milling damage, including delamination, burr, and tear, are analyzed. Second, the grinding mechanisms, covering material removal mechanism, thermal mechanical behavior, surface integrity, and damage, are discussed. Third, suppression strategies are reviewed systematically from the aspects of advanced cutting tools and technologies, including ultrasonic vibration-assisted machining, cryogenic cooling, minimum quantity lubrication (MQL), and tool optimization design. Ultrasonic vibration shows the greatest advantage of restraining machining force, which can be reduced by approximately 60% compared with conventional machining. Cryogenic cooling is the most effective method to reduce temperature with a maximum reduction of approximately 60%. MQL shows its advantages in terms of reducing friction coefficient, force, temperature, and tool wear. Finally, research gaps and future exploration directions are prospected, giving researchers opportunity to deepen specific aspects and explore new area for achieving high precision surface machining of fiber-reinforced composites.

Keywords： milling grinding fiber-reinforced composites damage formation mechanism delamination material removal mechanism surface integrity minimum quantity lubrication

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Bottlenecks and countermeasures of high-penetration renewable energy development in china Feature article

Jizhen Liu, Qinghua Wang, Ziqiu Song, Fang Fang

Engineering 2021, Volume 7, Issue 11, Pages 1611-1622 doi: 10.1016/j.eng.2020.08.016

Abstract: Focusing on these bottlenecks, we propose seven solutions: centralized and distributed development of

Keywords： Bottlenecks Countermeasures Idle wind and solar power Renewable energy

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Extreme-scale parallel computing: bottlenecks and strategies None

Ze-yao MO

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 10, Pages 1251-1260 doi: 10.1631/FITEE.1800421

Abstract: To address the challenges of these capabilities toward exascale, we systematically analyze the major bottlenecksFor these bottlenecks, we propose a series of urgent key issues and coping strategies.

Keywords： Extreme scale Numerical simulation Parallel computing Supercomputers

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Development of Industrial Software for Building Materials Industry

Hu Yahan , Kou Zhenzhen , Jiang Yuan , Tan Dongjie , Li Anpeng , Yuan Yingmin , Wan Jiayi , Xin Yu

Strategic Study of CAE 2022, Volume 24, Issue 4, Pages 177-187 doi: 10.15302/J-SSCAE-2022.04.012

Abstract: justify;">8.1 Technical suggestions

8.1.1 Addressing the technical bottlenecksFocusing on the key "neck" technologies and major application bottlenecks in the building materials

Keywords： building materials industry industrial software industrial bottlenecks intelligent manufacturing

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Development Path of China’s Industrial Software Industry in the New Era

Shao Zhufeng, Zhao Yun, Wang Chen, Feng Xiguang, Wang Jianmin, Xiong Hongting

Strategic Study of CAE 2022, Volume 24, Issue 2, Pages 86-95 doi: 10.15302/J-SSCAE-2022.02.010

Abstract:

The industrial software industry is an important support for the high-quality development of the manufacturing industry. Against the background of strengthening China’s manufacturing industry in the new era, industrial software is becoming a direct driving force for optimizing manufacturing and management processes, transforming production methods and relations, improving total-factor productivity, and promoting the spillover and transformation of advanced industrial technologies. China is currently building an independent, controllable, safe, and efficient modern industrial system, which not only challenges the original “technology– production–market” division of labor, but also creates important opportunities for the development of the industrial software industry. Considering the current international market structure, this paper analyzes the basic characteristics and market share of industrial software products, analyzes the shortcomings and problems of China’s industrial software industry development, and summarizes two new development trends of the industrial software industry: platform-based and open source development. Based on this, we propose the following three development paths: (1) improving weak links while strengthening basic research, (2) making technical breakthroughs to catch up with the international advanced level, and (3) leading the development with frontier technologies, hoping to address the industrial deficiencies and improve the industrial level. Furthermore, we propose several suggestions. First, the organizational model should be optimized to maximize the leading role of industrial enterprises. Second, the policy objects should be refined to promote the breakthrough of key technologies regarding industrial software at different levels. Third, the application market needs to be expanded to promote the innovation of industrial software products. Fourth, it is necessary to tap the potentials of talents and support the cultivation of industrial software talents through multiple channels.

Keywords： industrial software system integration industrial bottlenecks development path leading the development