Doctoral Dissertations

Abstract

"Additive manufacturing (AM) is defined as the process of joining materials to make objects from three-dimensional model data. Complex geometries can be easily manufactured compared to conventional subtractive methods with more freedom and flexibility in the design process. As the demand for AM process increased, it has become critical to understand the process and various parameters that constitute in affecting the quality of the manufactured part. Conducting experiments can be time intensive and costly to optimize a process. Modeling can be used as an aid to optimize, examine, and predict the process outcome.

The objective of this study is (i) To develop a meso-scale model to capture the melt pool behavior in additive manufacturing of high strength steels. A meso-scale model was developed with realistic powder properties to understand the powder behavior in the L-PBF proess. The models were validated with experimental results. (ii) To develop a constitutive material model for the stainless steels to understand the plastic behavior of stainless steels manufactured through powder bed fusion process. Low-strain rate, high temperature tensile tests were carried out to calibrate the parameters of Johnson-Cook strength model. To obtain these parameters, tensile specimens were adiditvely manufactured with 304L stainless steel powder. The material model developed was used in numerical simulation of tensile tests and compared with experimental results. (iii) To evaluate the performance of modified increased surface area aluminum honeycombs that are additively manufactured and compare them with the traditional honeycombs in sandwich applications" -- Abstract, p. iii

Advisor(s)

Chandrashekhara, K.

Committee Member(s)

Liou, Frank W.
Dharani, Lokeswarappa R.
Newkirk, Joseph William
Corns, Steven

Department(s)

Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Mechanical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2024

Pagination

xii, 88 pages

Note about bibliography

Includes_bibliographical_references_(pages 40, 62, 90 & 95-97)

Rights

©2024 Manoj Kumar Reddy Rangapuram , All Rights Reserved

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12428

Electronic OCLC #

1477966689

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