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基于声学显微镜的材料弹性常数超声无损检测方法,利用点或线聚焦探头对水浸试件经散焦测量,获取材料声学特性,进而反演材料力学性能.在工程应用中,常会遇到被测工件过大或试件材质不宜浸水等问题,难以进行散焦测量.新型胶体耦合介质具有制备简单、成本低、用后易清理、环保无污染等特点.胶体介质经多次不同配比试验,确定最佳配比,其介质密度、声速及声阻抗等声学性能与水近似,满足水浸探头的测试需要.利用该耦合介质对铝、钢和钛试件弹性常数进行超声无损检测,实验结果与水浸测量一致,与理论值及拉伸法测量结果吻合,将其应用于大型铝板弹性常数检测,测试结果也与理论值相符.研究表明新型胶体耦合介质超声检测效果满足聚焦探头散焦测试需要,扩大了基于声学显微镜的材料弹性常数超声无损检测范围,为工程应用提供了有效的技术手段.
Based on the acoustic non-destructive testing method of material elastic constants based on acoustic microscope, the point-line or line-focusing probe is used to measure the acoustic properties of materials and obtain the mechanical properties of the materials after being defocused, and in engineering applications, The workpiece is too large or the specimen material should not be soaked in water and other issues, it is difficult to defocus measurement.The new colloidal coupling medium has the characteristics of simple preparation, low cost, easy to clean after use, environmental protection and pollution, etc. Colloidal medium after several different ratio test, Determine the optimal ratio, the dielectric density, sound velocity and acoustic impedance and other acoustic properties and water approximation to meet the testing needs of immersion probe.Using the coupling medium for aluminum, steel and titanium elastic constant modulus of non-destructive testing, the experimental results Which is in good agreement with the water immersion measurement and with the theoretical value and the tensile method.The results show that the new colloidal coupling medium ultrasonic testing effect meets the requirements of the focus probe defocusing test It is necessary to expand the range of ultrasonic non-destructive testing of elastic constants of material based on acoustic microscope and provide an effective technical means for engineering application .