双相不锈钢焊缝的声学参量测试和数值仿真研究

项目名称： 双相不锈钢焊缝的声学参量测试和数值仿真研究

项目编号： No.11504403

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 宋波

作者单位： 中国科学院声学研究所

项目金额： 22万元

中文摘要： 在现代工业制造中，非均匀各向异性材料的应用日益广泛。双相不锈钢材料作为典型代表，具有耐腐蚀、高强度和易于加工等优点，被广泛应用于海洋平台和海底管线建设等领域。如何高效地检测双相不锈钢焊缝的质量，已成为海洋工程中亟待解决的问题。由于双相不锈钢焊缝具有非均匀各向异性结构，超声波在其中传播时会出现偏折、分叉和高衰减等现象，导致检测困难，因此其超声检测一直是国内外研究的热点和难点。本项目拟采用声学方法逐点测量焊缝各区域的弹性常数，精确描述其声学特性，并利用弹性动力学有限积分法建立数值仿真模型，研究焊缝中超声传播和散射规律，进一步将理论计算与实验方法相结合，对模型进行优化。本项目将形成研究双相不锈钢焊缝中超声传播与散射的系统测试和分析方法，可为其现场检测提供理论和方法的指导。

中文关键词： 超声检测；双相不锈钢；焊缝；数值仿真；弹性动力学有限积分

英文摘要： Inhomogeneous anisotropic materials are increasingly used in modern industry manufacturing. As a typical example, duplex stainless steel is utilized for constructions of offshore platform and subsea pipeline, due to its outstanding features of corrosion resistance, high strength and good workability etc. It is an urgent problem to test the quality of its weld joints efficiently. Because of the inhomogeneous and anisotropic properties of duplex stainless steel, ultrasonic waves will be scattered, mode-converted and severely attenuated. Thus, its ultrasonic testing has been one of the attractive and difficult issues both home and abroad. To get accurate data, this project will measure the elastic constants point by point in the weld joint by ultrasonics. Then a numerical model will be built by elasto-dynamic finite integration technique (EFIT) to study the propagation and scattering of ultrasonic waves. Furthermore, theoretical and experimental results will be integrated to optimize the model. Systematic method for measuring and analyzing duplex stainless steel will be generated, which will give theoretical and technical guidance to field ultrasonic testing.

英文关键词： Ultrasonic testing;duplex stainless steel ;weld joints;numerical simulation ;Elasto-dynamic Finite Integration