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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >EFFECTS OF PLASTIC DEFORMATION ON ULTRASONIC DAMPING IN FERRITIC STEEL
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EFFECTS OF PLASTIC DEFORMATION ON ULTRASONIC DAMPING IN FERRITIC STEEL

机译：塑性变形对铁素体钢超声阻尼的影响

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摘要

Measurements sensitive to dislocation pinning are natural candidates for nondestructively evaluating the integrity of structures before cracks develop, because the mobility of dislocations plays a central role in determining the mechanical properties of materials. Traditionally, fundamental research on dislocation pinning below the plastic regime has employed low-frequency (～1 Hz) mechanical vibrations that simultaneously break dislocations away from pinning points and sense the strength of pinning. The exploratory study described here has pursued an ultrasonic approach, viewing high-frequency measurements as being more practical for most potential applications. It has sought to determine whether measurements of ultrasonic dislocation damping under quasistatic loads can provide information on prior mechanical damage of structural ferritic steels.
机译：对位错钉扎敏感的测量是自然的候选方法，可以在裂纹发展之前无损地评估结构的完整性，因为位错的迁移率在确定材料的机械性能中起着核心作用。传统上，在塑性状态下进行位错钉扎的基础研究采用低频（〜1 Hz）机械振动，该振动同时使位错脱离钉扎点并感知钉扎的强度。此处描述的探索性研究采用了超声波方法，认为高频测量对于大多数潜在应用而言更为实用。它试图确定在准静态载荷下超声位错阻尼的测量是否可以提供有关结构铁素体钢先前的机械损伤的信息。

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