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Title

Development of a Thermal Micro Tensile Testing Technique for Select Layer Interfaces of TRISO Particles

Organization

Department: Nuclear Eng'g & Health Physics

University: Idaho State University College: Science & Engineering Department: Nuclear Eng'g & Health Physics 23

Document Attachments

Resource	Length	Width	Thickness
Paper	0	0	0

Specimen Elements

City

Pocatello

Coverage

Unknown to Unknown

Creator

Charles Rivera

Publisher

Idaho State University

Type

Thesis

Is Complete

No

Date Published

2/3/2025

Archive

digital

City: Pocatello

Degree

Master

Document Attachments

Abstracts

The work described in this thesis is the development and implementation of a thermal micro-tensile testing technique for the buffer-IPyC layer interface of nuclear fuel surrogate TRISO-coated particles. This technique allows for microscale tensile strength characterization of the interface samples above room/ambient temperature. The results of this research are meant to complement results from micro-tensile testing of TRISO particle buffer, IPyC and buffer-IPyC layer interface samples at room temperature. The latter testing was performed as part of a Department of Energy research grant through the Nuclear Energy University Program (NEUP) and TRISO-coated particle layer samples from the DOE’s AGR program also were tested TRISO-coated particle buffer-IPyC interlayer samples tested for this thesis were prepared and tested using a technique demonstrated during the NEUP work. Tensile testing samples were machined using a Focused Ion Beam (FIB) and the strength testing was conducted in a Scanning Electron Microscope (SEM) with a PI-88 PicoIndenter system. A micro-electromechanical system (MEMS) was added to the PI-88 to allow for micro tensile testing at elevated temperatures. Temperatures chosen at which to perform the micro tensile testing were 180°C and 380°C. The main result of this work was demonstration of a method for thermomechanical micro tensile testing of TRISO layers where stress vs strain curve data was successfully calculated along with mechanical property values such as fracture strength and total strain. Keywords: Buffer, IPyC, Tensile testing, TRISO