[보고서]나노소재 국부 고유 역학특성 평가를 위한 이론 / 실험 / 수치해석 융합기술

나노소재 국부 고유 역학특성 평가를 위한 이론 / 실험 / 수치해석 융합기술
Integrated approach of theory / test / numerical analysis for the characterization of intrinsic mechanical properties of nano-structured materials 원문보기

보고서 정보
주관연구기관	서강대학교 산학협력단 Sogang University
보고서유형	최종보고서
발행국가	대한민국
언어	한국어
발행년월	2012-08
과제시작연도	2011
주관부처	교육과학기술부 Ministry of Education and Science Technology(MEST)
등록번호	TRKO201300012063
과제고유번호	1345151649
사업명	중견연구자지원
DB 구축일자	2013-08-26
키워드	나노압입시험.유한요소해석.최적압입조건.압자형상.크리프.박 막.파괴인성.보정기법.물성평가.Nano-indentation test.FE Analysis.Optimal indentation condition.Indenter geometry.Creep.Thin film.Fracture toughness.Correction method.Material property evaluation.
DOI	https://doi.org/10.23000/TRKO201300012063

초록 ▼

본 연구는 나소소재의 국부 고유 역학특성을 평가하는 이론 / 실험 / 수치해석 융합기술 개발을 목표로 한다. 우선 압입자형상, 재료종류 및 재료크기에 따른 압입특성을 나노 압입시험 및 유한요소해석을 통해 체계적으로 정리한다. 이어 소재별 최적 압입시험 조건 및 시험 보정기법을 제시해 표준압입시험법을 확립한다. 압입특성분석을 바탕으로 나노소재의 특성을 평가할 수 있는 수치접근법 개발하고, 이를 최적 압입시험조건과 결합해 융합기술을 완성한다. 본 연구결과는 금속, 고무, 세라믹, 생체재료 등 다양한 나노소재 및 나노구조물의 제반 특성을

Abstract ▼

This study aims to develop an integrated approach of theory / test / numerical analysis for the characterization of intrinsic mechanical properties of nano-structured materials. First, we systematically establish indentation characteristics with indenter geometry, materials and size using FE analysis and nano-indentation. Secondly, we propose a standard process for nanoindentation by suggesting optimal nano-indentation conditions and correcting method. Thirdly, based on the analyses of indentation characteristics, we establish a numerical approach for the evaluation of material properties for various nano-structured materials. Then, we validate the approach using nano property testing and nano-indentation test. The integrated approach will be a standard method of evaluating material properties and characteristics for nano-structured
materials.

목차 Contents

중견연구자지원사업(핵심연구) 최종보고서 ... 1
목차 ... 3
연구계획 요약문 ... 4
연구결과 요약문 ... 5
한글요약문 ... 5
SUMMARY ... 6
연구내용 및 결과 ... 7
1. 연구개발과제의 개요 ... 7
2. 국내외 기술개발 현황 ... 9
3. 연구수행 내용 및 결과 ... 11
4. 목표달성도 및 관련분야에의 기여도 ... 89
5. 연구결과의 활용계획 ... 90
6. 연구과정에서 수집한 해외과학기술정보 ... 91
7. 주관연구책임자 대표적 연구실적 ... 92
8. 공동연구책임자 대표적 연구실적 ... 92
9. 참고문헌 ... 93
10. 연구성과 ... 95

표/그림 (102)

표 Schematic of sharp indentation profiles of finite tip-radius indenter
표 Forces vs. ht curves for various values of R
표 Forces vs. ha curves for various values of R and C
표 c2 vs. 1/n curves for various values of yield strain
표 Distribution of c2*with respect to actual indentation depth
표 Comparison of c2 for different tip radii (E = 200 GPa)
표 FE model for Berkovich indentation
표 The FE mesh for ht/D=20% indentation analyses
표 The FE mesh for t/D = 0.4 indentation analyses
표 Equivalent plastic strain vs. l/D at 2r/d= 0.8 for various indentation depths
표 Comparison of computed material property values with fixed Young’s modulus program
표 Regression curve of (a) equivalent plastic strain (b) factor ψ and (c) factor c2
표 Comparison of computed εp-calibration factors to those given from FEA
표 Variation of κ with various values of (a) n (b) t/D (c) εo (d) E/Es
표 Variation of c2, εp, and ψ correction factor with elastic modulus ratio
표 Flow chart for determination of material properties
표 Comparison of computed stress-strain curves to those given
표 Comparison of computed material property values to true values for variation of n
표 Comparison of computed material property values to true values for variation of E
표 Comparison of computed material property values to true values for variation of E and σo
표 Comparison of computed material property values to true values for variation of σo
표 Traction-separation relation for an irreversible (bilinear cohesive interface model)
표 FE model for 3D pyramidal indentation using cohesive zone elementfor various indenter shape
표 Variation of c and α with friction coefficient
표 FE model for 1/4 Vickers indentation
표 Indentation parameters for FE analysis using cohesive element
표 The obtained values of c from FE Analysis and nano-indentation test with Pmax
표 Morphologies of crack with indentation parameter
표 Isometric section of idealized crack morphologies observed at indentationcontact (a) cone (b) radial (c) median (d) half-penny and (e) lateral crack
표 Evolution of crack at loading and unloading states for soda-lime glass [Vickers indentation]
표 Nano indentation system
표 Indentation cracking test specimen of (a) Si (100) (b) Ge (100)
표 Schematic of (a) the centerline-to-face angle ψ for a three-sided pyramidal indenter and (b) the geometry of indentation cracking
표 The obtained values of impression size and crack length for four different indenter angle
표 SEM micrographs in Ge (100) for two different indenter angles (a) ψ = 35.3° and (b) ψ = 45°
표 SEM micrographs in (a) Si (100) (b) Ge (100) [Pmax = 50 mN, ψ = 55°]
표 Variation of H and E with indentation depth for four different materials
표 Values of Cf from various hmax with fixed LC = 2.0 μm
표 FE model for 1/6 triangular pyramidal indentation
표 Obtained indentation parameters for various material properties [Si (100)]
표 The obtained values of a and c from nano-indentation test and FE analysis for four different materials
표 Comparison of indentation load-depth curves obtained from FE analysis and indentation test for Si (100)
표 Deformed surface and crack shape at fully unloaded state for (a) Si (100) (b) Ge (100)[Pmax = 50mN, ψ = 55°]
표 Schematic figure of star crack induced by centrally located expansion forces
표 Variation of c with the number of crack
표 Schematic of three indenters with the same projected contact area
표 Variation of c and a for 3 different indenter shapes and 4 different indention depths (E = 200 GPa)
표 Surface crack morphologies in loaded and unloaded states induced by [(a), (b)] Berkovich [(c), (d)] Vickers [(e), (f)] six-sided and [(g), (h)] eight-sided pyramidal indenter
표 (a) Variation of a with the maximum load (b) Pmax/c3/2 vs. Pmax and (c) variation of c/a with the maximum load for four different indenter angles
표 Comparison of crack lengths obtained from Berkovich,Vickers and six-sided pyramid indenter (FE analysis)
표 Comparison of crack lengths obtained from Berkovich and Vickersindenters
표 Variation of c with the centerline-to-face angle
표 Comparison of crack lengths obtained from 3 different indenters
표 Schematic figure of cracking induced by three-sided pyramidal indenterin (a) top-view, (b) side-view
표 Deformed surface and crack shape at fully unloaded state for (a) ψ = 65.3°, (b) ψ = 55°,(c) ψ = 75° (hmax = 1 µm) and (d) ψ = 65.3° (hmax = 2 µm)
표 Variation of crack displacement with indentation depth for(a) hmax = 1 µm (b) hmax = 2 µm (ψ = 65.3°)
표 Variation of c/a and κo with the centerline-to-face angle ψ
표 Variation of κ with the centerline-to-face angle ψ
표 κo vs. ν for four different yield strain for (a) E = 100 GPa (b) E = 200 GPa(c) E = 400 GPa and (d) E = 600 GPa
표 κo κ vs. εo for four different Young’s moduli (ν = 0.3)
$κo vs. εo for two different fracture toughness (E = 400 GPa, ν = 0.3)$ 표 κo vs. εo for two different fracture toughness (E = 400 GPa, ν = 0.3)
표 Regression curves of κo vs. εo for four different values of ν
$Comparison of computed fracture toughness values to conventional method$ 표 Comparison of computed fracture toughness values to conventional method
$Comparison of fracture toughness imposed in FEA and those computedusing Eq. (3.18) (a) ν = 0.1 (b) ν = 0.2 (c) ν = 0.3 and (d) ν = 0.4$ 표 Comparison of fracture toughness imposed in FEA and those computedusing Eq. (3.18) (a) ν = 0.1 (b) ν = 0.2 (c) ν = 0.3 and (d) ν = 0.4
$Comparison of fracture toughness values determinedby indentation and conventional means$ 표 Comparison of fracture toughness values determinedby indentation and conventional means
$Comparison of computed fracture toughness values to those given (ψ = 55 o)$ 표 Comparison of computed fracture toughness values to those given (ψ = 55 o)
$Comparison of computed fracture toughness values to those given (Berkovich)$ 표 Comparison of computed fracture toughness values to those given (Berkovich)
표 Schematic of two indenters with same projected contact area.
표 Overall mesh design (a) using axisymmetric conical indenter and (b) 1/6 triangular pyramidal indenter (α = 65.3°; Berkovich)
표 Normalized force vs. indentation depth for various values of yield strain
표 Loading curves for various values of yield strain
표 β vs. 1/n curves for various values of yield strain
표 Values of κ1jk regressed from various εo and n by 3rd order equation
표 c2 vs. 1/n curves for various values of yield strain
표 The regression curves of f1iTP(εo) in Eq. (2) vs. εo (3rd regression)
표 [C/E]corr. vs. 1/n curves for various values of yield strain
표 The regression curves of fij (εo) in Eq. (5) vs. ε ro (3 regression)
표 Values of ψijk regressed from various εo and n by 3rd order equation
표 Comparison of computed property values (E = 200 GPa, accurate C1, C2)
표 Comparison of computed stress-strain curves to those given for E = 200 GPausing WC indenter [εo = (a) 0.001 (b) 0.002 (c) 0.003 and (d) 0.004]
표 Comparison of computed property values (E = 200 GPa, C1 : 2% ↑, C2:2%↑)
표 Comparison of computed property values (E = 200 GPa, C1 : 2% ↓, C2:2%↓)
표 Sensitivity to reverse analysis
표 Identical C vs. 1/n curves with εo for two different E
표 Comparison of computed property values (E = 200 GPa, diamond indenter)
표 Comparison of computed stress-strain curves to those given for E = 200 GPausing diamond indenter [εo = (a) 0.001 (b) 0.002 (c) 0.003 and (d) 0.004]
표 Schematic of sharp indenter composed of cylindrical and taper parts
표 C/E vs.1/n curves for various values of yield strain
표 Values of Cf from various zT and z1 T with fixed zC = 0.25mm
표 Values of Cf from various zC and z1 T with fixed zT = 0.25mm
표 Comparison of [C/E]corr. with different indenter shape
표 Values of C/E from various ht with fixed R = 0.025mm
표 Values of [C/E]corr. from various ht with fixed R = 0.025mm
표 C/E vs. R/ht curves for three values of E
표 P vs. ht curves for various values of R/ht
표 An enlargement of the 0.0045 mm < ht2 < 0.0060 mm region
표 Schematic of Berkovich indenter
표 C/E vs. 1/n curves for various values of yield strain
표 [C/E]corr. vs. 1/n curves for various values of yield strain
표 Comparison of /ht for the different materials
표 (a) Axisymmetric and (b) three-dimensional FE models for simulations of conical and Berkovich indentation
표 Dependence of (a) c, (b) a and (c) a* on m and n when εr = 0.2cotβ

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연합인증

나노소재 국부 고유 역학특성 평가를 위한 이론 / 실험 / 수치해석 융합기술
Integrated approach of theory / test / numerical analysis for the characterization of intrinsic mechanical properties of nano-structured materials 원문보기