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首页> 外文期刊>Journal of Applied Polymer Science >Acoustic Characteristics of PMMA in the Steady Stress-Strain State Investigated by Coherent Brillouin Scattering Method
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Acoustic Characteristics of PMMA in the Steady Stress-Strain State Investigated by Coherent Brillouin Scattering Method

机译：相干布里渊散射法研究稳态应力-应变状态下PMMA的声学特性

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摘要

The acoustic properties of PMMA poly(methyl methacrylate) deformed by tensile stress were investigated by the coherent Brillouin scattering method. The ultrasonic velocities of PMMA in steady stress-strain states were measured in the frequency range of 100 MHz to 1 GHz. The ultrasonic velocities decreased with increasing strain, and the ratio of the decrease increased with increasing strain rate. This result indicates that the crazing residues still remain in the steady stress-strain states, and the amount of hte residues depends upon the strain rate. The velocity dispersion was observed around 400 MHz for virgin and deformed PMMA and reproduced iwth a single relaxation process. The relaxation process is assigned to the #gamma#-relaxatioin according to the dispersion map for methyl group relaxation in PMMA. The relaxation frequency and strength were independent of the applied stress and strain. The viscoelastic and plastic deformation have little effect on the #gamma#-relaxation.
机译：通过相干布里渊散射法研究了由于拉伸应力而变形的PMMA聚甲基丙烯酸甲酯的声学性能。在100 MHz到1 GHz的频率范围内，测量了在稳定应力应变状态下PMMA的超声速度。超声速度随着应变的增加而降低，下降的比例随应变率的增加而增加。该结果表明，开裂残余物仍保持在稳态应力-应变状态，并且残余残余物的量取决于应变率。对于原始的和变形的PMMA，在400 MHz附近观察到速度分散，并且通过单个弛豫过程得以再现。根据PMMA中甲基弛豫的分散图，将弛豫过程分配给＃γ＃-松弛。弛豫频率和强度与所施加的应力和应变无关。粘弹性和塑性变形对＃γ＃松弛的影响很小。

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