PMMA珠粒填料弹性性能的超声探测及其在压力烧结过程中的重排
Ultrasonic probing of the elastic properties of PMMA bead packings and their rearrangement during pressure sintering
摘要：
研究了应力作用下PMMA球形珠填料烧结过程中的超声透射特性。相干纵波的速度和振幅的测量进行监测的固体框架的弹性性能的演变从非粘性填料烧结颗粒材料。实验速度数据与接触模型预测值[Digby，J.Appl.Mech.48，803，（1981）]之间的比较揭示了粘结效应对颗粒压块机械行为的关键作用。通过声散斑相关技术，我们还观察到烧结开始前颗粒堆积中重要的重排。
英文摘要：
Ultrasound transmission in PMMA spherical bead packings is investigated during the sintering process under stress. Velocity and amplitude measurements of coherent longitudinal waves are performed to monitor the evolution of the elastic properties of the solid frame from noncohesive packing to sintered granular material. Comparison between the experimental velocity data and the prediction by a contact model [Digby, J. Appl. Mech. 48, 803, (1981)] reveals the crucial role of the bonding effect on the mechanical behavior of granular compacts. By using the correlation technique of acoustic speckles, we also observe the important rearrangements in granular packings before the onset of sintering.
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