Authors

O. Benafan; S. A. Padula; H. D. Skorpenske; K. An;R. Vaidyanathan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Rev. Sci. Instrum.

Keywords

SHAPE-MEMORY ALLOY; SUPERELASTIC NITI; ELASTIC STRAINS; HIGH-PRESSURE; DIFFRACTION; TEXTURE; EVOLUTION; BEHAVIOR; VULCAN; STRESS; Instruments & Instrumentation; Physics, Applied

Abstract

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 (R) R 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 similar 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.

Journal Title

Review of Scientific Instruments

Volume

85

Issue/Number

10

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

12

WOS Identifier

WOS:000344594200045

ISSN

0034-6748

Download

Share

COinS