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Ultrasonic Time-of-Flight Diffraction (TOFD) Measurements of Crack Depths in an Acceleration Reservoir of a High Velocity Research Gun

机译：超高速飞行时间衍射（TOFD）测量高速研究枪加速油藏中的裂缝深度

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The acceleration reservoir (AR) of a two-stage light gas gun at Sandia's STAR - Shockwave Thermodynamic Applied Research - facility allows for the formation of shock fronts to propagate and accelerate projectiles with impact velocities up to 25,000 ft/second. The shock loading techniques are used by the Thermomechanical and Physical Division 1534 to study the properties of materials under extreme stress, stress rate, and temperature conditions. Because of the impact of a lead slurry-impregnated polyethylene piston at the tapered section of the AR, fatigue cracks develop and propagate in the bore area after each shot of the gun. Presently, the AR is taken out of service when the outer diameter of the AR increases by a given amount. In order to learn more about the actual damage present in a retired AR, the present study was undertaken. The reservoir investigated in this study was taken out of service after 103 shots. The ultrasonic pulse echo and Time-Of-Flight Diffraction (TOFD) techniques were employed in order to quantify the distribution of cracks along with their lengths and depths. The ultrasonic data will be used by division 1534 to investigate the nature of the fracturing process and perhaps model with a computer the dynamics of a crack subjected to pulse and shock loading. Hopefully, this information may then be used in the future to determine the proper retirement time of the reservoir. (ERA citation 13:026540)

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Gieske, J. H.;
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年度 1988
页码 1-20
总页数 20
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Guns; Acceleration; Crack Propagation; Cracks; Damage; Diffraction; Experimental Data; Fracture Mechanics; Lead; Measuring Methods; Pistons; Polyethylenes; Projectiles; Shock Waves; Time-of-Flight Method; Ultrasonic Testing;

机译：枪;加速;裂纹扩展;裂纹;损伤;衍射;实验数据;断裂力学;铅;测量方法;活塞;聚乙烯;弹丸;冲击波;飞行时间法;超声波测试;

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Ultrasonic Time-of-Flight Diffraction (TOFD) Measurements of Crack Depths in an Acceleration Reservoir of a High Velocity Research Gun

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