Abstract：
A crashworthiness design of foam-filled local nanocrystallized thin-walled tubes (FLNTs) is proposed by using foam-filled structures and ultrasonic impact surface treatment. The crashworthiness and deformation modes of FLNTs are studied using an experiment and numerical analysis. A finite element numerical model of FLNTs is established, and the processing and test platform of FLNTs is set up to verify the numerical predication and analytical design. The results show that local nanocrystallization is an effective method to enhance crashworthiness for hexagonal FLNTs. The FLNTs with four circumferential continuous stripes of surface nanocrystallization exhibit a level of 47.12% higher specific energy absorption than the untreated tubes in numerical simulations for tubes with a 50% ratio of nanocrystallized area. Inspired by the strength mechanism, a novel nested foam-filled local surface nanocrystallization tube is further designed and studied in detail.
摘要：
通过使用泡沫填充结构和超声冲击表面处理，提出了泡沫填充的局部纳米化薄壁管（FLNT）的耐撞性设计。通过实验和数值分析研究了FLNT的耐撞性和变形模式。建立了FLNTs的有限元数值模型,建立了FLNTs的处理和测试平台，验证了数值预测和分析设计。结果表明，局部纳米化是提高六方FLNT耐撞性的有效方法。在纳米化面积为50％的管的数值模拟中，具有四个圆周连续表面纳米化条纹的FLNT比未经处理的管表现出比能量吸收高47.12％的水平。受到力量机制的启发，进一步设计并详细研究了一种新型嵌套泡沫填充局部表面纳米化管。
