Dr. Scales has expertise in the fundamental mechanics of solids and structures, with a knowledge base that includes elasticity, metal plasticity, fracture, and structural stability. He is experienced in modern experimental methods for mechanical characterization of materials, and has conducted non-linear finite element analyses of large-deformation processes using advanced constitutive models. Dr. Scales also has experience with the ASME Boiler and Pressure Vessel Code (BPVC), as well as metallographic and failure analysis techniques. Since joining Exponent, he has applied his skillset to problems such as code-compliance and mechanical assessment of a heat exchanger, failures of welds in bunk bed guard rails, corrosion and mechanical overload of various automotive components, and a metallurgical analysis of cracked boiler tubes.
As a graduate student at the University of Texas, Dr. Scales studied localization and ductile failure of aluminum alloys in support of the automotive industry’s increasing use of aluminum for body and frame components. He developed experiments in which custom-designed tubular specimens were loaded to failure under biaxial stress states, and used digital image correlation to measure the strains. He also performed hydraulic bulge tests on aluminum sheet metal to investigate its forming characteristics. Dr. Scales used his experimental data to establish the alloy’s anisotropy which he incorporated into finite element analyses. He served as a teaching assistant for courses in solid mechanics, advanced strength of materials, and dynamics.
Prior to graduate school Dr. Scales was an officer in the US Navy where he served as a steam generator technology engineer in the Naval Nuclear Propulsion Program. In this role he evaluated proposed changes to plant operation and water chemistry, and analyzed data from material tests and component inspections. He also managed ongoing maintenance, inspection, and repair activities at shipyards.
CREDENTIALS & PROFESSIONAL HONORS
- Ph.D., Engineering Mechanics, University of Texas, Austin, 2019
- M.S., Engineering Mechanics, University of Texas, Austin, 2018
- B.S., Civil Engineering, University of Texas, Austin, 2008
Scales M, Chen K, Kyriakides S. Material response, localization, and failure of an aluminum alloy under combined shear and tension: Part I experiments. Int’l Journal of Plasticity 2019. 120: 340-360.
Chen K, Scales M, Kyriakides S. Material response, localization, and failure of an aluminum alloy under combined shear and tension: Part II analysis. Int’l Journal of Plasticity 2019. 120: 361-379.
Chen K, Kyriakides S, Scales M. Effect of material frame rotation on the hardening of an anisotropic material in simple shear tests. ASME Journal of Applied Mech 2018. 85(12): 124501; 1-5
Chen K, Scales M, Kyriakides S. Material hardening of a high ductility aluminum alloy from a bulge test. Int’l Journal of Mechanical Sciences 2018. 138 139: 476-488.
Scales M, Tardif N, Kyriakides S. Ductile failure of aluminum alloy tubes under combined torsion and tension. Int’l Journal of Solids and Structures 2016. 97-98: 116–128.
Chen K, Scales M, Kyriakides S, Corona E. Effects of anisotropy on material hardening and burst in the bulge test. Int’l Journal of Solids and Structures 2016. 82: 7-84.
Chen K, Scales M, Kyriakides S. Ductile failure under combined tension and shear. USNC/TAM, Chicago, IL, 2018.
Chen K, Scales M, Kyriakides S. Response and failure of aluminum alloys under combined loads. ASME IMECE, Tampa, FL, 2017.
Chen K, Scales M, Kyriakides S. Modeling of the response and localization that precede failure under combined shear and tension. Society of Engineering Science, Boston, MA, 2017.
Scales K, Kyriakides S, Tardif N. Ductile failure of an aluminum alloy under moderate to low triaxialities. Int'l Congress of Theoretical and Applied Mechanics. Montreal, Quebec, Canada, 2016.
Chen K, Scales M, Kyriakides S, Corona E. Anisotropy in an aluminum alloy sheet and its effect on the onset of failure in a bulge test. ASME Applied Mechanics and Materials Conference. Seattle, WA, 2015.
International Journal of Solids and Structures