利用超声波的热调制测量三阶弹性常数
Measurement of third-order elastic constants using thermal modulation of ultrasonic waves
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中文总结 AI 辅助
针对三阶弹性常数测量繁琐误差大的问题，该研究提出利用超声波热调制的方法，通过单轴加载与热调制试验测得铝样品的TOEC，两种方法结果吻合，热调制法装置简单灵敏度高，可用于测定TOEC及绝对声学非线性参数。
中文摘要 AI 辅助
三阶弹性常数（TOEC）在非线性材料表征中发挥重要作用，但TOEC的测量过程繁琐且误差范围大。本研究给出各向同性介质中，均匀温度变化和单轴应力引起的波速变化方程，以及由热诱导波速变化和热应变表示TOEC的表达式。通过单轴加载试验和热调制试验测量超声波速变化，实验确定铝样品的TOEC，两种试验方法结果吻合良好。由于测试装置简单且测量灵敏度高，热调制试验是测定TOEC和绝对声学非线性参数的潜在实验方法。
英文摘要
Third-order elastic constants (TOEC) play an important role in nonlinear material characterization, but measurements of TOEC are laborious with large error margins. This Letter presents the equations of wave velocity changes caused by homogeneous temperature variation and uniaxial stress in isotropic media and the expression of TOEC in terms of thermally induced velocity change and thermal strain. TOEC of an aluminum sample were experimentally determined by measuring ultrasonic wave velocity changes in the uniaxial loading test and the thermal modulation test. Experimental results showed good agreement between the two test methods. Owing to the simple test setup and high measurement sensitivity, the thermal modulation test is a potential experimental method to determine TOEC and absolute acoustic nonlinearity parameters.
