Hardening and fracture behaviors at ultra-high strain rates for metallic materials = 초고 변형률속도에서의 금속재료의 경화거동 및 파단특성에 관한 연구

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This dissertation is concerned with the dynamic hardening and fracture behaviors of metallic materials at a wide range of strain rates from $10^{-3}$ /s to $10^6$ /s. The main outcomes of this dissertation are: (i) experiments to obtain hardening behaviors and fracture strains at a wide range of strain rates from $10^{-3}$ /s to $10^3$ /s and temperatures from 25$\circ C$ to 200$\circ C$; (ii) consideration of thermal softening effect at various strain rates due to large plastic deformation; (iii) development of a rate and temperature dependent constitutive model to describe strain rate hardening and thermal softening behaviors; (iv) investigation of a novel systematic procedure to calibrate hardening behaviors at ultra-high strain rates ranging from $10^4$ /s to $10^6$ /s where hardening behaviors are difficult to acquire from conventional experiments; (v) development of a strain rate dependent fracture criterion which can decently estimate experiment results at various strain rates and loading paths; and (vi) prediction of sequential deformed shapes and fractured shapes of projectiles from Taylor impact tests for different metallic materials.
Advisors
Huh, Hoonresearcher허훈researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학과, 2017.8,[viii, 135 p. :]

Keywords

Ultra-high strain rate▼athermal softening▼ahardening model▼afracture strain▼afracture model▼aTaylor impact test; 초고 변형률속도▼a온도연화▼a동적 경화모델▼a파단 변형률▼a파단 모델▼a테일러 충돌시험

URI
http://hdl.handle.net/10203/241724
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718784&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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