Defect‐Free Sound Insulator Using Single Metal‐Based Friction Stir Process Array
Defect‐Free Sound Insulator Using Single Metal‐Based Friction Stir Process Array
复制标题
DOI：
10.1002/adem.202300206
复制
发表时间：
2023-07
影响因子：
3.6
通讯作者：
Yuqi Jin;Teng Yang;N. Dahotre;A. Neogi;Tianhao Wang
中科院分区：
文献类型：
--
作者：
Yuqi Jin;Teng Yang;N. Dahotre;A. Neogi;Tianhao Wang
金属是声子传输的优良导体，如振动、声音和热。通常，金属隔音体需要多材料结构或缺陷，而单金属隔音体具有挑战性。因此，提出了一种由单一合金和多个摩擦搅拌工艺（FSP）制成的无缺陷隔音体的设计。周期性的摩擦搅拌处理可以诱导超晶格的局部力学性能的改变。通过实验声学表征，观察到FSP可以通过搅拌区和热影响区的存在在铝板上引入清晰的声弹性特性对比。在数值模拟中，签名FSP诱导的属性分布周期性地且不规则地布置在长铝板上。传输间隙频率存在于频谱上，其中声音传播方向垂直于FSP路径。进一步引入FSP周期性上的无序偏移。安德森定位在共振频率上，其通过指数衰减提供−11 dB声音降低。由于有限的设计长度，轻微的无序也可以提高在周期性的传输间隙频率的隔音。通过对不同配置的分析和比较，模型中的最佳性能可以在350 mm长的铝合金板上实现−30 dB的隔音效果，并具有14个平行的FSP。
Metals are excellent conductors for phonon transportation such as vibration, sound, and heat. Generally, metal sound insulators require multimaterial structure or defects and unimetal sound insulators are challenging. Therefore, a design of a defect‐free sound insulator made by single alloys with multiple friction stir processes (FSPs) is proposed. Periodic friction stir processing can induce superlattice‐like local mechanical properties’ modifications. By experimental acoustic characterization, it is observed that FSP can introduce clear acoustic–elastic property contrast on an aluminum plate by the presence of stir zone and heat‐affected zones. In numerical simulations, the signature FSP‐induced property profile is periodically and parallelly arranged on a long aluminum plate. The transmission gap frequencies are present on the frequency spectrum with the sound propagation direction perpendicular to the FSP paths. Disorder offsets on FSP periodicity are further introduced. Anderson localization is found on a resonance frequency, which provides −11 dB sound reduction by an exponential decay. Due to the finite design length, the slight disorder can also enhance sound insulation in the periodic transmission gap frequency. With analysis and comparison with different configurations, the best performance in the models can achieve −30 dB sound insulation in the 350 mm‐long aluminum alloy plate with 14 parallel FSPs.