Abstract
An experimental method, using in-situ neutron diffraction for the measurement of shear strain, based on (hkl) lattice spacing changes under torsional loading, is described. This method provides the ability to probe the response of crystallographic planes to application of shear stress, inside the bulk of samples that are subjected to torsion. To demonstrate the method, shear moduli corresponding to bcc (211), (200), and (110) were experimentally determined for a solid cylinder of ferritic alloy 12L14 under elastic loading. Results indicate that the elastic constants determined under torsional shear show a different degree of anisotropy than those obtained from tensile loading.
Original language | English |
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Article number | 191904 |
Journal | Applied Physics Letters |
Volume | 100 |
Issue number | 19 |
DOIs | |
State | Published - May 7 2012 |
Externally published | Yes |
Funding
The authors would like to acknowledge the help of Dr. A. Siriruk and Mr. K. G. Thomas who performed accompanying testing using a MTS tension-torsion loading system at the University of Tennessee. Gratefully appreciated is the support of Mr. B. Cady and Mr. P. Cornwell who assisted with the experiments at NRSF2. Also, we would like to express appreciation to Dr. R. C. Wimpory and Dr. N. Kardjilov for their support during experiments performed at Helmholtz Zentrum Berlin. The authors further acknowledge the help of Mr. M. Kant at the University of Tennessee and Dr. S. C. Vogel for texture measurements at HIPPO instrument of LANSCE. Research at the 2nd Generation Neutron Residual Stress Mapping Facility at the High Flux Isotope Reactor was partially sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program, through the Oak Ridge National Laboratory’s High Temperature Materials Laboratory User Program and by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. This material is based upon work partially supported by the US National Science Foundation under Grant No. #0801470 to Dr. D. Penumadu for supporting IGERT student, Mr. J. Bunn.