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theoretical fracture models

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005461
EISBN: 978-1-62708-196-2
... Abstract This article discusses physical analysis, including slab method and upper-bound method and slip-line field analysis, for calculating stress states in plastic deformation processes. It presents various validation standards and models for evaluating the criterion of fracture for use in...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002418
EISBN: 978-1-62708-193-1
... 343 10.1016/0022-5096(94)00077-I 37. Budiansky B. and Amazigo J.C. , paper presented at IUTAM Symposium on Nonlinear Analysis of Fracture , International Union of Theoretical and Applied Mechanics, Sept 1995 38. Morgan P.E.D. and Marshall D.B. , J. Am. Ceram...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005435
EISBN: 978-1-62708-196-2
... Abstract This article assesses the evolution of martensite modeling in the changing materials engineering environment. It describes the physics of displacive transformations using Ginzburg-Landau theory, microstructure representation, dynamics and simulations, density functional theory, and...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005422
EISBN: 978-1-62708-196-2
... Microstructure Evolution in 2D Polycrystals,” Ph.D. thesis, Dortmund, Wulff-Verlag , 2008 51. Mohles V. , Philos. Mag. A , Vol 81 , 2001 , p 971 52. Mohles V. , Fundamental Dislocation Theory and 3D Dislocation Mechanics , Multiscale Modeling of Plasticity and Fracture by Means...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005407
EISBN: 978-1-62708-196-2
... Abstract Neural-network (NN) modeling is most suitable for simulations of correlations that are hard to describe or cannot be accurately predicted by physical models. This article describes the principles and procedures of NN modeling. It discusses the use of NN modeling in general organization...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002349
EISBN: 978-1-62708-193-1
... the cause of cracking or crack growth. This article discusses the macroscopic and microscopic basis of understanding and modeling fracture resistance of metals. It describes the four major types of failure modes in engineering alloys, namely, dimpled rupture, ductile striation formation, cleavage or...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002410
EISBN: 978-1-62708-193-1
... summarized. The article also discusses the effects of microstructure and extrinsic parameters on fatigue crack propagation (FCP). It details the modeling of FCP rates and creep and creep-fatigue crack growth rates. creep creep-fatigue crack growth rate fatigue fatigue crack propagation fracture...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... Abstract This article provides a description of the microscale models and mechanisms for deformation and fracture. Macroscale and microscale appearances of ductile and brittle fracture are discussed for various specimen geometries and loading conditions. The article reviews the general...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... Abstract This article focuses on characterizing the fracture-surface appearance at the microscale and contains some discussion on both crack nucleation and propagation mechanisms that cause the fracture appearance. It begins with a discussion on microscale models and mechanisms for deformation...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003400
EISBN: 978-1-62708-195-5
... Failure Strain and Work of Fracture in 3D Weaves,” to be published, 2001 21. McGlockton M.A. , McMeeking R.M. , and Cox B.N. , “A Model for the Axial Strength of Unidirectional Ceramic Matrix Fiber Composites,” to be published, 2001 22. Neuber H. , Theory of Stress...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002374
EISBN: 978-1-62708-193-1
... pressed and sintered Fe-1.8Ni-0.5Mo-0.5C P/M compacts Double pressed and double sintered, 1120 °C, 1 2 h, tested as-sintered Porosity, % Density, g/cm 3 Elastic modulus, GPa Yield strength, MPa Ultimate strength, MPa Elongation, % Notched impact energy, J Fracture toughness, MPa...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001838
EISBN: 978-1-62708-181-8
... equation that links R S directly to R L according to: (Eq 5) R S = ( 4 π ) ( R L − 1 ) + 1 Equation 5 provides the best fit to all known experimental data ( Ref 7 ). It is based on a realistic model, that is, a fracture surface that can have any...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002398
EISBN: 978-1-62708-193-1
... Abstract This article summarizes the general fatigue and fracture properties of cast steels, namely, toughness, fatigue, and component design factors such as section size and discontinuities. It describes the various factors that influence fatigue of cast steels. These factors include section...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003311
EISBN: 978-1-62708-176-4
... that most monolithic ceramics behave in a linear-elastic manner has allowed the direct transition of theory from LEFM developed for metals to use on ceramics. Current fracture toughness research on monolithic ceramics is centered on refining test methods, data acquisition techniques, and theoretical...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002470
EISBN: 978-1-62708-194-8
... challenge in fracture mechanics in the 1960s and 1970s was to establish working models for materials that were too tough to be characterized by the Griffith-Irwin fracture mechanics approach, which was somewhat limiting to elastically behaving materials. In the early 1960s, Wells proposed a crack-tip...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
... Abstract This article describes concepts and tools that can be used by the failure analyst to understand and address deformation, cracking, or fracture after a stress-related failure has occurred. Issues related to the determination and use of stress are detailed. Stress is defined, and a...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003312
EISBN: 978-1-62708-176-4
... c is the fracture resistance, and H is the hardness. Although the exponents in Eq 7 are specific to the application and material, it is apparent from the model that to minimize abrasive wear at high loads, P , the material must possess high K c , high H , and low E . A possible proposed...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002379
EISBN: 978-1-62708-193-1
... zone at the crack tip. A decrease in sulfur level in steel increases the spacing between the inclusions, thereby increasing the size of the plastically deformed process zone. This contribution to increased fracture toughness can be rationalized in terms of Kraft's model: (Eq 9) K Ic ≈ 2...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
... include detailed dislocation models or complex mathematical treatment, but will present the mechanisms in more general terms in order to impart a practical understanding as well as an ability to identify the basic fracture modes correctly. When overload is the principal cause of fracture, most common...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... failure by fracture. They have also been applied to cyclic loading. In practice, the Tresca and von Mises criteria are most often used today to predict yield in isotropic constant-volume materials. The Rankine model is not often used because of its inability to predict behavior when one principal stress...