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首页> 外文会议>4th International spacecraft propulsion conference >EXPERIMENTAL ASSESSMENT OF THE SUSCEPTIBILITY TO STRESS-CORROSION CRACKING OF Ti-6Al-4V ALLOY EXPOSED TO MON-1 PROPELLANT TANK ENVIRONMENT – BACKGROUND AND TEST DESIGN
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EXPERIMENTAL ASSESSMENT OF THE SUSCEPTIBILITY TO STRESS-CORROSION CRACKING OF Ti-6Al-4V ALLOY EXPOSED TO MON-1 PROPELLANT TANK ENVIRONMENT – BACKGROUND AND TEST DESIGN

机译：MON-1推进剂罐环境中Ti-6Al-4V合金应力腐蚀开裂敏感性的实验评估–背景与试验设计

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摘要

Due to the Rosetta satellite launch postponement, the possibility of subjecting the titanium propellant tanks to off-loading, decontamination and subsequent refilling was considered by the European Space Agency. In this light, it was unknown whether, during this process, alterations of chemical composition of residuals in the tanks could cause unacceptable stresscorrosion damage of the tank material. So far, the susceptibility of Ti-6Al-4V alloy to stress-corrosion cracking in MON-1 environment has been assessed in nominal conditions of stress and chemical environment which are not sufficiently representative of real cases such as the off-loading, decontamination and refilling of tanks. The test programme that will be described in the paper has the objective of assessing the possibility of stress-corrosion cracking in Ti-6Al-4V propellant tanks in the case of tank off-loading, decontamination and refilling. The assessment involves the experimental determination of crack propagation stress intensity threshold values of parent plate and weld material exposed to the propellant tank stress and chemical environment expected during off-loading and decontamination. Based on these test results, the Agency will generate requirements on the reusability of titanium propellant tanks and recommendations to future projects on how to design tanks to avoid stresscorrosion damage. Since the test activity is currently in progress, in this paper the discussion will be focused on the background and test design phase.
机译：由于罗塞塔卫星的发射推迟，欧洲航天局考虑了对钛推进剂储罐进行卸载，净化和随后重新装填的可能性。因此，尚不清楚在此过程中，储罐中残留物化学成分的变化是否会引起储罐材料的不可接受的应力腐蚀破坏。到目前为止，已经在应力和化学环境的名义条件下评估了MON-1环境中Ti-6Al-4V合金对应力腐蚀开裂的敏感性，这些条件不足以代表实际情况，例如卸载，去污和化学腐蚀。坦克的加油。本文将介绍的测试程序旨在评估在卸载，去污和重新装满油箱的情况下Ti-6Al-4V推进剂油箱应力腐蚀开裂的可能性。评估涉及实验确定母板和焊接材料的裂纹扩展应力强度阈值，这些阈值在卸荷和去污过程中会受到推进剂罐应力和化学环境的影响。根据这些测试结果，原子能机构将对钛推进剂储罐的可重复使用性提出要求，并就如何设计储罐以避免应力腐蚀损坏向未来项目提出建议。由于测试活动目前正在进行中，因此本文的讨论将集中在背景和测试设计阶段。

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