In the preliminary stage of designing new structural hardware to perform a given mission in a fluctuating load environment, there are several factors that the designer should consider. Trade studies for different design configurations should be performed and, based on strength and weight considerations, among others, an optimum configuration selected. The selected design must withstand the environment in question without failure. Therefore, a comprehensive structural analysis that consists of static, dynamic, fatigue, and fracture is necessary to ensure the integrity of the structure. Engineers must also consider the feasibility of fabricating the structural hardware in the material selection process. During the past few decades, fracture mechanics has become a necessary discipline for the solution of many structural problems in which the survivability of structure containing pre-existing flaws is of great interest. These problems include structural failures resulting from cracks that are inherent in the material, or defects that are introduced in the part due to improper handling or rough machining, that must be assessed through fracture mechanics concepts.
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ISBN-13
978-1-4615-1585-2 (9781461515852)
DOI
10.1007/978-1-4615-1585-2
Schweitzer Klassifikation
Chapter1 Overview of Fracture Mechanics and Failure Prevention.- 1.0 Introduction.- 1.1 High Cycle Fatigue.- 1.2 Low Cycle Fatigue.- 1.3 Stress and Strain at Notch (Neuber Relationship).- 1.4 Linear Elastic Fracture Mechanics (LEFM) and Applications.- 1.5 Elastic-Plastic Fracture Mechanics (EPFM).- 1.6 Failure Prevention and Fracture Control Plan.- References.- Chapter2 Linear Elastic Fracture Mechanics (LEFM) and Applications.- 2.0 Introduction to Elastic Fracture.- 2.1 Griffith Theory of Elastic Fracture.- 2.2 The Stress Intensity Factor Approach, K.- 2.3 Fracture Toughness.- 2.4 Material Anisotropy and its Effect on Fracture Toughness.- 2.5 Factors Affecting Fracture Toughness.- 2.6 Residual Strength Capability of a Cracked Structure.- 2.7 Plasticity at the Crack Tip within Small Scale Yielding.- 2.8 Surface or Part Through Cracks.- 2.9 A Brief Description of ASTM Fracture Toughness Testing.- References.- Chapter3 Fatigue Crack Growth and Applications.- 3.1 Introduction.- 3.2 Crack Growth Rate Empirical Descriptions.- 3.3 Stress Ratio and Crack Closure Effect.- 3.4 Variable Amplitude Stress and the Retardation Phenomenon.- 3.5 Cycle by Cycle Fatigue Crack Growth Analysis.- 3.6 Environmental Assisted Corrosion Cracking.- References.- Chapter4 Elastic-Plastic Fracture Mechanics (EPFM) and Applications.- 4.0 Overview.- 4.1 Introduction.- 4.2 Introduction to Griffith Energy Balance Approach.- 4.3 The Path Independent J- Integral and its Application.- 4.4 Comments Concerning the Path Independent J-Integral Concept.- 4.5 J-Controlled Concept and Stable Crack Growth.- 4.6 Experimental Evaluation of J-Integral and JIC Testing.- 4.7 Determination of JIC Value Based on a Singie Specimen Test.- References.- Chapter5 The Fracture Mechanics of Ductile Metals Theory.- 5.0 Introduction.- 5.1 The Extended Griffith Theory.- 5.2 Fracture Mechanics Of Ductile Metals (FMDM).- 5.3 Determination of g1 = ?UF/?c Term.- 5.4 Determination of the g2= ?UU/?c Term.- 5.5 Octahedral Shear Stress Theory (Plane Strain Conditions).- 5.6 Applied Stress, ?, and Half Crack Length, c, Relationship.- 5.7 Mixed Mode Fracture and Thickness Parameters.- 5.8 The Stress-Strain Curve.- 5.9 Verification of FMDM Results with the Experimental Data.- 5.10 Fracture Toughness Computation by the FMDM Theory.- References.- Chapter6 Welded Joints and Applications.- 6.0 Introduction.- 6.1 Welding of Aluminum Alloys.- 6.2 Variable Polarity Plasma Arc (VPPA).- 6.3 Friction Stir Welding (FSW).- 6.4 Summary.- References.- Chapter7 Bolted Joints and Applications.- 7.1 Introduction.- 7.2 Bolted Joint Subjected to Cyclic Loading.- 7.3 Bolt Preload.- 7.4 Fatigue Crack Growth Analysis of Pads in a Bolted Joint.- 7.5 Riveted Joints.- 7.6 Material Anisotropy and its Application in Bolt Analysis.- References.- Chapter8 Durability and Damage Tolerance of Composites.- 8.1 Overview of Composite.- 8.2 Overview of Textiles Composites.- 8.3 Progressive Fracture Methodology.- 8.4 Composite Structural Analysis and Input and Output.- 8.5 Conclusions.- References.- Appendix A.
