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首页> 外文期刊>Review of Scientific Instruments >Design and implementation of a multiaxial loading capability during heating on an engineering neutron diffractometer
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Design and implementation of a multiaxial loading capability during heating on an engineering neutron diffractometer

机译：工程中子衍射仪加热过程中多轴加载能力的设计与实现

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A gripping capability was designed, implemented, and tested for in situ neutron diffraction measurements during multiaxial loading and heating on the VULCAN engineering materials diffractometer at the spallation neutron source at Oak Ridge National Laboratory. The proposed capability allowed for the acquisition of neutron spectra during tension, compression, torsion, and/or complex loading paths at elevated temperatures. The design consisted of age-hardened, Inconel® 718 grips with direct attachment to the existing MTS load frame having axial and torsional capacities of 100 kN and 400 N·m, respectively. Internal cooling passages were incorporated into the gripping system for fast cooling rates during high temperature experiments up to ∼1000 K. The specimen mounting couplers combined a threaded and hexed end-connection for ease of sample installation/removal without introducing any unwanted loads. Instrumentation of this capability is documented in this work along with various performance parameters. The gripping system was utilized to investigate deformation in NiTi shape memory alloys under various loading/control modes (e.g., isothermal, isobaric, and cyclic), and preliminary results are presented. The measurements facilitated the quantification of the texture, internal strain, and phase fraction evolution in NiTi shape memory alloys under various loading/control modes.
机译：在橡树岭国家实验室的散裂中子源上的VULCAN工程材料衍射仪上，在多轴加载和加热期间针对原位中子衍射测量设计，实现并测试了抓地能力。所提出的能力允许在高温下的拉伸，压缩，扭转和/或复杂的加载路径期间获取中子光谱。该设计由经过硬化处理的Inconel ® 718手柄组成，这些手柄直接附接到现有的MTS载荷框架，其轴向和扭转能力分别为100 kN和400 N·m。内部夹持通道并入夹具系统中，以在高达1000 K的高温实验中实现快速冷却。样品安装耦合器结合了螺纹和六角端接，以便于样品安装/拆卸，而不会引入任何不必要的载荷。在这项工作中记录了此功能的说明以及各种性能参数。该抓持系统用于研究NiTi形状记忆合金在各种加载/控制模式（例如，等温，等压和循环）下的变形，并提供了初步结果。这些测量结果有助于量化NiTi形状记忆合金在不同加载/控制模式下的织构，内部应变和相分数演变。

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