【摘要】 着陆缓冲机构是"天问一号"火星探测器在行星表面软着陆时的关键部件之一,需要采用吸能效率高、耐高低温的能量吸收材料。介绍了火星探测器着陆缓冲机构中采用高锰奥氏体孪生诱发塑性钢(Twining Induced Plasticity,TWIP)制拉杆的能量吸收设计。给出了TWIP钢的高塑性变形微观机理和力学特性。试验结果表明,TWIP钢具备600 MPa拉伸应力和72%拉伸应变的高塑性变形能力。通过仿真分析和试验验证方法,验证了TWIP钢制拉杆在火星探测器着陆缓冲机构中的应用效果。结果表明,着陆缓冲机构能够在各种复杂着陆工况下保证稳定的能量吸收性能。更多还原

【Abstract】 The landing gear is a key component for soft-landing on Mars, which should use high energy-absorption and excellent thermal stability material to absorb the impact energy of Mars probe. The energy absorption pull rods made by directionally solidified twinning-induced plasticity(TWIP) were utilized for the soft landing gears of Mars lander. The mechanical behavior and microstructure evolution of TWIP steel were investigated. The results show that TWIP steel can sustain the high plasticity of 600 MPa ultimate true stress and 72% true strain. The landing dynamic simulation and experiment results of soft-landing gear drop testes demonstrate that that Mars landing system is able to adapt to the complex topography conditions because of the high energy absorption ability of pull rods.更多还原