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damage tolerance criterion

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Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... fluctuations. This article begins with an overview of fatigue properties and design life. This is followed by a description of the two approaches to fatigue, namely infinite-life criterion and finite-life criterion, along with information on damage tolerance criterion. The article then discusses the...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003515
EISBN: 978-1-62708-180-1
... “inspectable” flaw size. The inspectable flaw size is the size that will be detected with a specific probability and confidence. The USAF uses 90% probability and 95% confidence for its inspectable-flaw criterion. Inspections are performed using a fracture mechanics analysis to determine the extent of growth...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... propagation in different environments. The article concludes with a discussion on rolling-contact fatigue, macropitting, micropitting, and subcase fatigue. corrosion fatigue crack growth crack initiation damage tolerance criterion fatigue fracture fatigue strength fatigue-crack propagation finite...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
..., such as bolt holes, bores, blade dovetail slots, or rim serrations ( Fig. 1 ), and thus lead to low-cycle fatigue cracking. The cyclic lives of these components are usually established on the basis of a probabilistic crack initiation criterion for a known fracture-critical location where, typically, 1...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... from plant-to-plant within the same company. In the earlier design days the principal design consideration was stress, that is, the load to cause failure at a specific wall thickness or cross-sectional area. The criterion for failure could be yielding resulting in plastic deformation or failure...
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
... stress) criterion, where the maximum principal stress is used. The other is the Tresca theory based on the maximum shear stress. The Rankine criterion holds that inelastic deformation at a point begins when the maximum normal stress reaches the yield strength of the material. Tresca's theory states that...
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
... calculate maximum load capability (e.g., multiaxial yield criteria). One failure mode theory is the Rankine (or maximum normal stress) criterion, where the maximum principal stress is used. The other is the Tresca theory based on the maximum shear stress. The Rankine criterion holds that inelastic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001504
EISBN: 978-1-62708-217-4
... the wash cycle. In this particular case, this measure had not yet been implemented and the aft of the beam was sealed by an unspecified plug which prevented drainage and drying out of the inside of the beam. Also, since the phenomena of corrosion and SCC are not dependent on flying time, a criterion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003558
EISBN: 978-1-62708-180-1
... of wear or root cause that results in the failure should be identified and defined. A criterion for acceptable wear also should be identified. Both pieces of information generally are important in developing an economical and practical solution. These factors should be determined as part of the...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003501
EISBN: 978-1-62708-180-1
...) may be a primary or secondary criterion, depending on the product objectives. The stage of detailed design ( Fig. 3 ) includes the embodiment or configuration level of design and parametric design. During configuration design, the emphasis is on determining the shape and approximate size of a...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... or parties may be liable for losses, be they loss of production, property damage, injury, or fatality. The discipline has also been used effectively as a teaching tool for new or less experienced engineers. The importance and value of failure analysis to safety, reliability, performance, and...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... 7910 ( Ref 7 ), the successor to PD 6493 ( Ref 6 ), incorporates a three-tiered (or 3-level) FAD criterion using CTOD as the characterization of both crack-driving force and fracture toughness. The tiered approach to the FAD treats the problem with increasing analytical sophistication and data...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... exceeded. Creep or distortion from other causes may change the dimensions of a structure so that it becomes susceptible to buckling. Further details can be found in references such as Ref 5 . In both classical design and limit analysis, yielding is assumed to be the criterion for calculating safe...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... losses, be they loss of production, property damage, injury, or fatality. The discipline has also been used effectively as a teaching tool for new or less experienced engineers. The importance and value of failure analysis to safety, reliability, performance, and economy are well documented. For...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... assumed to be the criterion for calculating safe loads on statically loaded structures. For a given design and applied load, the two methods differ in that the safety factor (the ratio of the theoretical capacity of a structural member to the maximum allowable load) is generally higher when calculated by...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003505
EISBN: 978-1-62708-180-1
... from the norm Design defects Less safe than expected by ordinary consumer Excessive preventable danger A failure to conform with stated specifications is an obvious manufacturing defect and not a new criterion. The aspect of user satisfaction may not be well known, but in the legal...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
..., shear stresses, deformations, etc.), its location, and the defined failure criterion (i.e., fracture, plastic deformation, etc.). Thus: (Eq 4) σ e   ≤   R s where R is the resistance to failure (and depends on the failure criterion), s is the safety factor, and the allowable...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
.... Galvanic current between aluminum and another metal also can be reduced by removing oxidizing agents from the electrolyte. Thus, the corrosion rate of aluminum coupled to copper in seawater is greatly reduced wherever the seawater is deaerated. The criterion for cathodic protection of aluminum in soils...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... oxidizing agents from the electrolyte. Thus, the corrosion rate of aluminum coupled to copper in seawater is greatly reduced wherever the seawater is deaerated. The criterion for cathodic protection of aluminum in soils and waters has been published by the National Association of Corrosion Engineers...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... OVERLOAD FAILURES, from the perspective of materials failure analysts, refer to the ductile or brittle fracture of a material when stresses exceed the load-bearing capacity of the material from either excessive applied stress or degradation of the load-bearing capacity of the material from damage...