CAE virtual technology of the most advanced compos

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CAE virtual technology for advanced composite materials

the current development of international advanced composite technology is more inclined to use the virtual design manufacturing verification integrated environment to integrate the real design, manufacturing, materials, verification, application, maintenance and life-cycle management, so as to minimize the development cycle of new products, reduce the development cost and improve the market competitiveness of products. In this process, CAE technology has become one of the cores of innovative design, digital design and manufacturing technology in national defense industry

advanced composite technology represented by carbon fiber reinforced composites originated from the national defense field. Similarly, computer aided engineering (CAE) technology also originated from the national defense field. In China, aviation advanced composite materials have developed for nearly 30 years, which is exactly the application history of CAE Technology in China's aviation industry. Thank you! See, there is a natural internal relationship between advanced composite technology and CAE technology. In fact, the essential relationship between them is the material engineering data system

development status of advanced composite material technology

composite material technology is a key technology of national defense with strategic significance. To a certain extent, the research level and application level of advanced composite materials are the representatives of a country's scientific and technological development level. Especially in the aircraft manufacturing industry, all kinds of advanced aircraft are closely linked with advanced material technology. Taking the armed helicopter as an example, the amount of composite materials used in advanced armed helicopters has reached about 50% (weight ratio), and the application parts of composite materials have developed from secondary load-bearing structures such as fairing, floor and integral wall panel to main load-bearing structures such as rotor, frame and beam, with typical models such as nh-90, boeing-360, V-22, RAH-66 and so on

with the increasing application proportion of composite materials in aircraft, advanced digital design and manufacturing technology and computer-aided engineering technology have been widely used in the field of composite material manufacturing. The simulation technology of laying, blanking, dipping, forming, curing and other processes and the application of cad/cam/cae technology have greatly reduced the development and manufacturing cost and improved the development and manufacturing efficiency. Nowadays, the manufacturing technology of composite materials is developing towards automation, low cost, integration and digitalization

in China, composite technology has not reached the level of digital design and manufacturing. At present, the traditional design and manufacturing technologies are mainly used in the production of composite materials for national defense industry in China, which is far behind the advanced level of foreign countries. One of the most important reasons is the lack of mature digital engineering environment. In fact, foreign research and application results have shown that in the design and manufacturing process of composite components, not only single digital design and manufacturing technology should be adopted, but also an integrated digital design and manufacturing environment should be established. From the perspective of computer software, hardware and advanced composite material design and manufacturing technology, all digital processes of design and manufacturing should be integrated to open up the digital production line of composite components, Realize the smooth transfer of product data from composite component design to final delivery. The current development of international advanced composite technology is more inclined to use the virtual design manufacturing verification integrated environment to unify the real design, manufacturing, materials, verification, application, maintenance and life cycle management, so as to minimize the development cycle of new products, reduce the development cost and improve the market competitiveness of products. In this process, CAE technology has become one of the cores of innovative design, digital design and manufacturing technology in national defense industry

advanced composite material data technology and system

to apply CAE technology to improve the development of China's advanced composite material technology, the basic condition and important premise is to research, develop and establish the corresponding composite material data technology and data system

1 the construction of composite material data system is the basis of realizing digital technology

scientific data is an important source of scientific and technological innovation. As the basis and achievement of the development of scientific and technological activities, basic scientific data is the platform for the rolling development of science and technology. A good scientific idea, theoretical hypothesis and applied technology can only be formed on the basis of mastering a large number of previous data and scientific data, and can only be confirmed under the support of a large number of relevant data. Systematic and comprehensive analysis of scientific data to promote the emergence of new scientific thinking is an important way to achieve scientific and technological innovation, and is also conducive to promoting the development of interdisciplinary. In particular, the development of contemporary science and technology obviously shows the characteristics of big science, quantification and process research. It increasingly relies on systematic and high reliable basic scientific data and its derived data products. Scientific research itself is the production process of scientific data

in material application research, including advanced composite materials, material data, as the embodiment of existing research results and the basis of future research work, plays a very important role in the whole scientific research work. However, material data itself as a resource has not been paid due attention, developed and utilized

2 national material data management system and operation mode in advanced countries

advanced countries attach great importance to the construction and maintenance of material data management and application system. So far, under the leadership of the Defense Technology Information Center (DTIC) of the U.S. Department of defense, the United States has established 13 national level data systems, forming a huge data management and application system for the defense industry, making great contributions to maintaining the world's leading competitiveness and sustainable development of the U.S. Defense Industry

by analyzing the advanced experience of the United States in material data management and application technology, we can sum up the following three important inspirations:

(1) it is actively promoted and funded by the government and the Ministry of national defense, and is commercialized and managed by professional institutions such as amptiac, which has a perfect organizational system; The development of the system is accompanied by the continuous expansion, merger, combination and improvement of new materials; Networking data management has become the main means to achieve cross time and cross region data sharing

(2) the scope of material data management covers five categories: metal and metal matrix composites, ceramics and ceramic matrix composites, polymer structures and polymer matrix composites, electronic, optical and optoelectronic materials, environmental protection and special functional materials; There are not only material data at the stage of test and development, but also many known, mature and valuable material information

(3) experts in materials and information technology cooperate to carry out data collection, evaluation, packaging, standard implementation, database development, etc. Focus on services, including technical consultation, investigation, training, compilation, publication and distribution of relevant materials and technical reports

3 historical experience of China's engineering material databases

China's national defense industry has also studied and established various material databases, and has some experience and lessons. First of all, the construction of database is often regarded as an independent subject or an internal scientific research project of a unit. It is not user-oriented, market-oriented, or commercial operation. Therefore, the market and users have low awareness and are difficult to promote. Secondly, the level of knowledge and the quality of data are not high enough, resulting in low-quality or useless data compression, and the database can not bring benefits into play. The development of the database system also did not make full use of the development achievements of the IT industry. The technical level of the database itself is low, and the networking level is low. Therefore, the service function of the database is weak and the service life is short. Finally, many aspects of data management, such as systematization, accuracy, reliability, traceability, security, intellectual property protection, authorized access to applications, have not been fully considered, and the data source and application scope have been restricted

4 particularity of composite data

according to the U.S. military composite materials manual (mil-hdbk-17f), the characteristics of advanced composite technology and composite data include:

(1) composite materials include matrix and reinforcing materials, and performance characterization must start from components

(2) because the failure mechanism of composite materials is completely different from that of metal materials, the international influence of China's plastic machinery industry is increasing, and the test methods are basically not applicable to composite materials; At the same time, the composites also have many special performance characterization requirements, especially hygrothermal and impact resistance

(3) composite materials are designable materials (plies with different proportions and different fiber directions), and the performance characterization of its basic structural element laminate is very complex

(4) the structure of the composite is formed synchronously with the material, and the variability of the material and process has an important impact on the properties of the material (also the structure)

(5) there is still a lack of experience in the design and use of composite materials and their structures in the world, and building block test verification must be adopted, so the type and quantity of tests far exceed that of metals

(6) composite material performance data must include: material screening, material certification, material acceptance, material equivalence and structure verification; In addition to the standardization of individual performance characterization, for material screening, material evidence collection, material acceptance, materials, etc., it is equivalent to placing the fracture in the middle of the gauge distance, and providing test matrices respectively for isotropic and structural verification

(7) mil-hdbk-17f also specifies the data traceability of the same composite system test results of different batches, different times and different laboratories, the normalization processing of different thickness data, the principle of eliminating abnormal data, the method of data statistical processing and other principles and operating steps

5 composite material testing technology and standard system

establish composite material database, and composite material testing technology standards must be first

as the performance test and characterization of composite materials are an important part of the development and production of composite materials and their structures, such complex and changeable contents have an extremely important impact on their quality assurance and structure verification. At the same time, they account for a large proportion in the development, production cost and time cost. Therefore, the performance characterization and standardization of composite materials have always been one of the main research directions in the field of composite materials

standardization includes two aspects, namely, the scope and method of performance test (including test standards, quantity, data processing methods and other key materials and engineering technologies such as high-performance thin-film solar cells, lithium-ion batteries and fuel cells) and the proposed test matrix for different applications

with the in-depth study of composite materials and their structures and the continuous expansion of the scope of application, the research on standardization is also deepening and developing. Mil-hdbk-17f and astmd30 composite standards are constantly updated, reflecting the research progress in the field of composite materials in the United States. A typical example is the measurement of tensile and compressive properties of unidirectional laminates. Rectangular specimens with unidirectional straight edges have strict requirements on the preparation state, and the failure position is often in the non measurement section (clamping area), which makes the test results low and highly dispersive. The orthogonal ply sample test and conversion method of mil-hdbk-17f has low requirements for sample preparation. The damaged parts generally appear in the measurement section, and the dispersion is small. In addition, the compression performance has always been the most difficult to measure. Up to now, China is still implementing the standard formulated in 1983, mil-hdbk-17f

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