拉伸试验中宏观变形和微观动力学的空间分辨扩散波谱测量
Space-resolved diffusing wave spectroscopy measurements of the macroscopic deformation and the microscopic dynamics in tensile strain tests
摘要：
我们耦合基于激光的，空间分辨的动态光散射装置的机械拉伸试验的通用试验机。我们对广泛应用于工业中的半结晶聚合物聚醚醚酮进行同时的光学和力学测量。由于样品的高浊度，光被样品多次散射，并使用漫射波光谱（DWS）形式主义来解释数据。空间分辨DWS产生样品应变和微观动力学的空间图。一个很好的协议之间的应变图，从而获得和那些由传统的立体相关工作台测量。微观动力学揭示了仿射运动和塑性重排。由于DWS对小至1 nm的位移具有极高的灵敏度，因此可以在样品变形的早期阶段检测到塑性活动及其空间定位，从而使本文提出的技术成为现有材料表征方法的宝贵补充。
英文摘要：
We couple a laser-based, space-resolved dynamic light scattering apparatus to a universal testing machine for mechanical extensional tests. We perform simultaneous optical and mechanical measurements on polyether ether ketone, a semi-crystalline polymer widely used in the industry. Due to the high turbidity of the sample, light is multiply scattered by the sample and the diffusing wave spectroscopy (DWS) formalism is used to interpret the data. Space-resolved DWS yields spatial maps of the sample strain and of the microscopic dynamics. An excellent agreement is found between the strain maps thus obtained and those measured by a conventional stereo-correlation bench. The microscopic dynamics reveals both affine motion and plastic rearrangements. Thanks to the extreme sensitivity of DWS to displacements as small as 1 nm, plastic activity and its spatial localization can be detected at an early stage of the sample deformation, making the technique presented here a valuable complement to existing material characterization methods.
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