發(fā)布時間：2018-03-28 13:29

  本文選題：無損檢測　切入點：粉末冶金　出處：《北京工業(yè)大學(xué)學(xué)報》2017年10期

【摘要】：為了檢測新材料性能和評估新制備工藝,利用超聲顯微無損檢測系統(tǒng)和PVDF線聚焦超聲探頭,對增材制造(3D打印)和粉末冶金2種特種加工試件進行表面波波速測量,用于材料力學(xué)性能的反演.利用散焦實驗測量和時間分辨法,測量試件截面不同位置、不同角度的表面波波速,獲取相應(yīng)位置和角度下的力學(xué)性能參數(shù).實驗所用窄探頭PVDF薄膜寬度僅為1 mm,通過減少被測面積,提高了探頭的分辨率.結(jié)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異,呈現(xiàn)出一定的各向異性.超聲顯微無損檢測系統(tǒng)可用于材料的小區(qū)域、多角度聲學(xué)性能測試,實現(xiàn)材料力學(xué)性能的反演表征,為新材料性能檢測、新制備工藝評估提供一種無損檢測與評價的方法.
[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.
【作者單位】： 北京工業(yè)大學(xué)機械工程與應(yīng)用電子技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(61271372)
【分類號】：TB302.5
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本文編號：1676525