Chaudhry Muhammad Salman, Czekanski Aleksander
Department of Mechanical Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada.
Materials (Basel). 2019 Nov 20;12(23):3817. doi: 10.3390/ma12233817.
The main aim of this research is to present complete methodological guidelines for dynamic characterization of elastomers when subjected to strain rates of 100/s-10,000/s. We consider the following three aspects: (i) the design of high strain rate testing apparatus, (ii) finite element analysis for the optimization of the experimental setup, and (iii) experimental parameters and validation for the response of an elastomeric specimen. To test low impedance soft materials, design of a modified Kolsky bar is discussed. Based on this design, the testing apparatus was constructed, validated, and optimized numerically using finite element methods. Furthermore, investigations on traditional pulse shaping techniques and a new design for pulse shaper are described. The effect of specimen geometry on the homogeneous deformation has been thoroughly accounted for. Using the optimized specimen geometry and pulse shaping technique, nitrile butadiene rubber was tested at different strain rates, and the experimental findings were compared to numerical predictions.
本研究的主要目的是给出在100/s - 10000/s应变率下弹性体动态表征的完整方法指南。我们考虑以下三个方面：(i) 高应变率测试设备的设计；(ii) 用于优化实验装置的有限元分析；(iii) 弹性体试样响应的实验参数及验证。为测试低阻抗软材料，讨论了一种改进型科尔斯基杆的设计。基于该设计，构建了测试设备，并使用有限元方法进行了数值验证和优化。此外，还描述了对传统脉冲整形技术的研究以及一种新型脉冲整形器的设计。充分考虑了试样几何形状对均匀变形的影响。使用优化后的试样几何形状和脉冲整形技术，在不同应变率下对丁腈橡胶进行了测试，并将实验结果与数值预测进行了比较。
