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Stephen Puplampu

Stephen PuplampuStephen Puplampu is enrolled in the Ph.D. program in the Civil and Environmental Engineering (CEE) Department at the University of Tennessee, Knoxville (UTK). He is a graduate research assistant (GRA) working with Professor Dayakar Penumadu. Mr. Puplampu received his B.Sc. in Physics from the Kwame Nkrumah University of Science and Technology (KNUST) in Kumasi, Ghana, in 2008 and stayed as a teaching assistant until 2009. Mr. Puplampu started his graduate studies at UTK in the spring of 2012 and has been investigating mechanical properties of structural marine aluminum alloys and the effects of thermal stresses on these alloys. He has performed neutron diffraction measurements on bulk materials to better understand the anisotropic lattice plane response to mechanical loading. A majority of the neutron diffraction experiments were carried out at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) using the Neutron Residual Stress Mapping Facility (NRSF2) instrument. Similar experiments were conducted at the E3 instrument at the Helmholtz Zentrum Berlin (HZB) in Berlin, Germany. Mr. Puplampu has experience with other techniques such as time-of-flight (TOF) diffraction (experiments conducted on the VULCAN engineering materials diffractometer at the Spallation Neutron Source (SNS) at ORNL) and three-dimensional imaging with X-ray and neutron tomography. Dr. Penumadu’s and Mr. Puplampu’s collaboration with Professor Larry Taylor and his group from the UTK Department of Earth and Planetary Sciences on the study of the internal texture of diamondiferous eclogites provides an example of the use of 3D imaging techniques. Another example is the investigation of stress-induced damage in an aluminum alloy of structural interest. During the fall of 2014, Mr. Puplampu worked as a teaching assistant for the graduate class Finite Element Applications for Engineering under the direction of Dr. Timothy Truster.

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