特殊制备材料力学性能超声无损检测与评价方法

发布时间：2018-03-28 13:29

  本文选题：无损检测　切入点：粉末冶金　出处：《北京工业大学学报》2017年10期

【摘要】：为了检测新材料性能和评估新制备工艺,利用超声显微无损检测系统和PVDF线聚焦超声探头,对增材制造(3D打印)和粉末冶金2种特种加工试件进行表面波波速测量,用于材料力学性能的反演.利用散焦实验测量和时间分辨法,测量试件截面不同位置、不同角度的表面波波速,获取相应位置和角度下的力学性能参数.实验所用窄探头PVDF薄膜宽度仅为1 mm,通过减少被测面积,提高了探头的分辨率.结果表明:粉末冶金材料在任意方向上的表面波波速基本一致,呈各向同性.3D打印材料不同方向表面波波速略有差异,呈现出一定的各向异性.超声显微无损检测系统可用于材料的小区域、多角度声学性能测试,实现材料力学性能的反演表征,为新材料性能检测、新制备工艺评估提供一种无损检测与评价的方法.
[Abstract]:In order to test the properties of new materials and evaluate the new preparation process, the surface wave velocity of two kinds of special processing specimens, such as powder metallurgy and powder metallurgy, were measured by ultrasonic microscopic nondestructive testing system and PVDF line focused ultrasonic probe. Using defocusing experimental measurement and time resolution method to measure the surface wave velocity at different positions and angles of the cross-section of the specimen, and using the method of time resolution to measure the velocity of wave on the surface of the specimen at different positions and at different angles. The mechanical properties at the corresponding position and angle are obtained. The width of the narrow probe PVDF thin film is only 1 mm, by reducing the measured area, The resolution of the probe is improved. The results show that the surface wave velocities of powder metallurgy materials are basically the same in any direction, and the surface wave velocities are slightly different in different directions of isotropic .3D printing materials. The ultrasonic microscopic nondestructive testing system can be used to test the acoustic properties of materials in a small area and at various angles, thus realizing the inverse characterization of the mechanical properties of materials, which is a new material performance test. New preparation process evaluation provides a nondestructive testing and evaluation method.
【作者单位】： 北京工业大学机械工程与应用电子技术学院;
【基金】：国家自然科学基金资助项目(61271372)
【分类号】：TB302.5
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本文编号：1676525