CAJ | 학술논문

基于超声导波声弹性效应检测波导结构的应力水平具有潜在的优势。为实现超声导波声弹应力检测的关键技术———检测模态与激励频率的选取，提出一种基于 Murnaghan 超弹模型的有限元特征频率法。使用该方法计算预应力杆中的频散特性，得到反映不同激励频率应力敏感性的声弹频散曲线，与文献中的 L（0，1）模态试验结果进行对比，趋势一致，说明该方法的适用性。为进一步验证该方法的可靠性，选取 L（0，1）模态声弹敏感的几组频率，在自制拉伸试验平台上，对碳素钢杆进行超声导波声弹试验。试验结果表明：低应力区域误差较大，在高应力区域误差均低于10％，且声弹常数与理论结果趋势一致。研究表明该理论方法可指导超声导波声弹应力检测时频率与模态的选取。
기우초성도파성탄성효응검측파도결구적응력수평구유잠재적우세。위실현초성도파성탄응력검측적관건기술———검측모태여격려빈솔적선취，제출일충기우 Murnaghan 초탄모형적유한원특정빈솔법。사용해방법계산예응력간중적빈산특성，득도반영불동격려빈솔응력민감성적성탄빈산곡선，여문헌중적 L（0，1）모태시험결과진행대비，추세일치，설명해방법적괄용성。위진일보험증해방법적가고성，선취 L（0，1）모태성탄민감적궤조빈솔，재자제랍신시험평태상，대탄소강간진행초성도파성탄시험。시험결과표명：저응력구역오차교대，재고응력구역오차균저우10％，차성탄상수여이론결과추세일치。연구표명해이론방법가지도초성도파성탄응력검측시빈솔여모태적선취。
The method of measuring the stress level of waveguide structures by use of the acoustoelastic effect of ultrasonic guided wave is of potential advantages.In order to select the optimal surveying mode and excitation frequency in acoutoelastic stress testing,a finite element eigenfrequency method based on the Murnaghan hyperelastic model was presented.The dispersion characteristic of a prestressed bar was calculated using this approach,and the acoustoelastic dispersion curve was obtained for describing the stress sensitivity under different excitation frequencies.The results are consistent with those in other literatures.On this basis,selecting the surveying mode and excitation frequency,the acoustoelastic effect of L(0,1)mode was inspected for Q235 carbon steel bar on a homemade tensile test platform.The results show that:the errors are great in low stress region whereas,in high stress region it can be controlled within 10%, and the tendency of acoutoelastic constants is in agreement with the theoretical results.The study proposes a method that can provide a determination method of surveying mode and excitation frequency for stress measurement by using the acoustoelastic effect of ultrasonic guided wave.