International:Evaluating the Magneto-Mechanical Response of Ferromagnetic Composites

在过去的10年里，大量的研究致力于一种很有前途的新的“活性”材料，即铁磁形状记忆合金(FSMA‘s)，它在外加磁场的影响下产生非常大的应变。应变是通过孪生边界运动的机制来验证的，而不是像传统的磁致伸缩材料(如Terfenol-D)中看到的那样，磁畴增长。已经观察到了与商业上可获得的形状记忆合金(SMA)(如NiTi)相当的应变水平。然而，FSMA材料作为执行器具有更大的前景，因为它们的磁感应应变允许比传统SMA的慢驱动(10赫兹)具有更高的工作频率。研究重点将集中在FSMA材料在高功率声纳、降噪和防振支架和结构等传感需求方面的应用。此外，格雷格·卡曼教授将与东亚研究人员一起访问，以促进美国和东亚之间的合作努力。

0338407CarmanIn the past 10 years a significant amount of research has been dedicated to a promising new 'active' material called Ferromagnetic Shape Memory Alloys (FSMA's) that generates very large strain under the influence of an applied magnetic field. The strain is probated through a mechanism of twin boundary motion as opposed to domain growth as seen in traditional magnetostrictive materials such as Terfenol-D. Strain levels comparable to commercially available Shape Memory Alloys (SMA's) such as NiTi have been observed. However, FSMA materials hold greater promise as actuators since their magnetically induced strain allows for higher operating frequencies than the slow actuation (10 Hz) of traditional SMA's. Research will focus on applications of FSMA material towards transduction needs such as high power sonar, noise reduction, and anti-vibration mounts and structures. In addition Professor Greg Carman will visit with East Asian researchers to generate collaborative efforts between the United States and East Asia.