5.4.2 重大科学问题1.极端服役条件下的结构损伤与断裂根据前述分析

5.4.2 Major scientific issues <br>1. Structural damage and fracture <br>under extreme service conditions Based on the foregoing analysis, it can be considered that breakthroughs in structural damage and fracture theory under extreme service conditions in the next 5 to 10 years will drive the entire discipline The key of the development is the scientific description of the phenomenon of cross-scale destruction under multi-coupling. Based on the damage and fracture theory based on multi-scale and multi-field coupling, it is expected to form a more accurate life prediction method, provide a scientific basis for the repair and remanufacturing of key parts, and establish a life monitoring technology for key structures. <br>2. The full life design theory based on the failure mechanism <br>can preventively design the risk and failure laws of the whole life process of the mechanical product during the conception and design stage of the mechanical product. Full-life design refers to the entire process of planning, designing, manufacturing, operating, maintaining, remanufacturing, and recycling of mechanical products and components to achieve the optimal design of the overall performance of the product during its entire life cycle.

5.4.2 重大科学问题<br>1.极端服役条件下的结构损伤与断裂<br>根据前述分析,可以认为在今后5～10年里在极端服役条件下的结构损们与断裂理论上取得突破将带动整个学科领域的发展,其中的关键是科学描述多耦合作用下跨尺度的破坏现象。在基于多尺度、多场耦合的损伤与断裂理论的基 础上,可望形成更为精确的寿命预测方法,提供关键零部件修复与再制造的安全科学基础,并建立关键结构的寿命监测技术。<br>2.基于失效机制的全寿命设计理论<br>在机械产品的构思与设计阶段便能针对其全寿命过程中的风险与失效规律 行防范性设计,是机被产品安全服役科学研究的最高追求。全寿命设计是指针对机械产品与零部件的规划、设计、制造、运行、维修、再制造以及回收再利用的全过程,实现产品全寿命周期内总体性能的最优设计。

5.4.2 major scientific issues<br>1. Structural damage and fracture under extreme service conditions<br>Based on the above analysis, it can be concluded that a breakthrough in the theory of structural damage and fracture under extreme service conditions in the next 5-10 years will drive the development of the whole discipline, the key of which is to scientifically describe the phenomenon of cross-scale damage under multi coupling cooperation. Based on the damage and fracture theory of multi-scale and multi field coupling, it is expected to form a more accurate life prediction method, provide a scientific basis for the repair and remanufacturing of key components, and establish a life monitoring technology for key structures.<br>2. Life cycle design theory based on failure mechanism<br>In the stage of conception and design of mechanical products, preventive design can be carried out according to the risk and failure rule in the whole life process, which is the highest pursuit of scientific research on safe service of mechanical products. Life cycle design refers to the whole process of planning, design, manufacturing, operation, maintenance, remanufacturing and recycling of mechanical products and parts, so as to realize the optimal design of overall performance in the whole life cycle of products.<br>