Wood Fracture Characterization

Description

Wood Fracture Characterizationprovides a guide to the application of modern fracture mechanics concepts to wood materials used in structural engineering, which commonly involve discontinuities and irregularities. The authors cover the tests, data reduction schemes and numerical methods devised for wood structural applications, based on cohesive zone analysis, and used to validate experimental-based methodologies. Five detailed Case Studies are included to link theory with engineering practice. This important new text explains the basics of fracture mechanics, and extends them as needed to cover the special behaviour of an anisotropic wood materials. Content: Cover Half Title Title Page Copyright Page Contents Preface Acknowledgements Authors 1 Introduction 1.1 Global Overview and Applications 1.2 Wood -- How Does It Form? 1.3 Wood Constituents and Micro-Structure 1.4 Wood at the Mesoscale References 2 Wood Mechanical Behaviour 2.1 Elastic and Strength Properties 2.1.1 Young's Moduli and Normal Strengths 2.1.2 Poisson's Ratios 2.1.3 Shear Moduli and Strengths 2.2 Strength Failure Criteria 2.3 Fracture Mechanics Based Approaches 2.3.1 Linear Elastic Fracture Mechanics 2.3.2 Cohesive Zone Models References 3 Mode I Fracture Characterisation3.1 Double Cantilever Beam 3.1.1 Test Description 3.1.2 Classical Data Reduction Schemes 3.1.3 Modified Experimental Compliance Method (MECM) 3.1.4 Compliance-Based Beam Method (CBBM) 3.1.5 Numerical Validation 3.1.6 Experimental and Numerical Results 3.2 Single-Edge-Notched Beam Loaded in Three-Point-Bending 3.2.1 Test Description 3.2.2 Data Reduction Scheme Based on Equivalent LEFM 3.2.3 Compliance-Based Beam Method 3.2.4 Numerical Validation of the Compliance-Based Beam Method 3.2.5 Experimental and Numerical Results 3.3 Tapered Double Cantilever Beam3.3.1 Test Description 3.3.2 Data Reduction Scheme 3.3.3 Compliance-Based Beam Method 3.3.4 Numerical Validation 3.3.5 Experimental and Numerical Results 3.4 Compact Tension Test 3.5 Conclusions of Mode I Fracture Tests References 4 Mode II Fracture Characterisation 4.1 End-Notched Flexure Test 4.1.1 Test Description 4.1.2 Classical Data Reduction Schemes 4.1.3 Compliance-Based Beam Method 4.1.4 Experimental and Numerical Results 4.2 End-Loaded Split Test (ELS) 4.2.1 Test Description 4.2.2 Classical Data Reduction Schemes 4.2.3 Compliance-Based Beam Method4.2.4 Experimental and Numerical Results 4.3 Four End-Notched Flexure Test 4.3.1 Test Description 4.3.2 Compliance Calibration Method 4.3.3 Compliance-Based Beam Method 4.3.4 Experimental and Numerical Results 4.4 Conclusions of Mode II Fracture Tests References 5 Mixed-Mode I + II Fracture Characterisation 5.1 Single-Leg Bending Test 5.1.1 Test Description 5.1.2 Compliance-Based Beam Method 5.1.3 Numerical Analysis 5.1.4 Experimental Results 5.2 End Load Shear-Mixed Mode Test 5.2.1 Test Description 5.2.2 Compliance-Based Beam Method 5.2.3 Numerical Analysis5.2.4 Experimental Results 5.3 Mixed-Mode Bending Test 5.3.1 Test Description 5.3.2 Experimental Analysis and Results 5.3.3 Numerical Validation 5.4 Conclusions of Mixed-Mode I + II Fracture Tests References 6 Structural Applications -- Case Studies 6.1 Wood Bonded Joints 6.1.1 Repaired Beam under Tensile Loading 6.1.2 Repaired Beam under Bending Loading 6.1.3 Reinforcement of Wood Structures 6.2 Wood Dowel Joints 6.2.1 Steel-Wood-Steel Connection 6.2.2 Wood-Wood Joint 6.3 Conclusions of Structural Applications References Index