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Valery Rudnev
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Abhijit Roy, Matthew Criado, John Ohodnicki, Howard Kuhn, Prashant N. Kumta
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Theodore L. Reinhart
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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003518
EISBN: 978-1-62708-180-1
.... It is more useful to view both the failure and the failure analysis as multilevel processes that can be explored in many useful ways. The physical failure—a fracture, an explosion, or component damaged by heat or corrosion—is the most obvious. However, there are always other levels of failures that allow...
Abstract
Failure analysis is a process that is performed to determine the causes or factors that have led to an undesired loss of functionality. This article describes some of the factors and conditions that might be considered when approaching a failure analysis problem. It focuses on the key principles, objectives, practices, and procedures of failure analysis. The article provides guidelines on the preparation of a protocol for a failure analysis. It also demonstrates the proper approaches to failure analysis.
Book: Composites
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003439
EISBN: 978-1-62708-195-5
... 2 ) has recently begun using the term “structural substantiation” to mean the generic process of validating the integrity of a structure, regardless of the agency in charge. Certification requirements exist in many other industries, although often under a different name and certainly...
Abstract
Composites are complex engineered materials that often behave differently than common isotropic materials. Before testing a composite material, or before ordering or supervising such testing, the responsible party should review certain considerations. This article provides an overview of such considerations, namely, the differences between the testing of composites and testing of isotropic materials, role of certification agencies and importance of their involvement, building-block approach to composites testing, determining the purpose of testing, normalizing results, and statistical data reduction.
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006754
EISBN: 978-1-62708-295-2
... levels. In other words, a failure should not be viewed as a single event. It is more useful to view both the failure and the failure analysis as multilevel processes that can be explored in many useful ways. The physical failure—a fracture, an explosion, or a component damaged by heat or corrosion...
Abstract
Failure analysis is a process that is performed in order to determine the causes or factors that have led to an undesired loss of functionality. This article is intended to demonstrate proper approaches to failure analysis work. The goal of the proper approach is to allow the most useful and relevant information to be obtained. The discussion covers the principles and approaches in failure analysis work, objectives and scopes of failure analysis, the planning stages for failure analysis, the preparation of a protocol for a failure analysis, practices used by failure analysts, and procedures of failure analysis.
Book Chapter
Engineering Aspects of Failure and Failure Analysis
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003224
EISBN: 978-1-62708-199-3
... involve loss of life, limb, and millions of dollars in property damage. Most metal failures can be adequately analyzed by the metallurgist. Others are more complex and require experts in other engineering disciplines. Sequence of Analysis The carpenter's adage “measure twice and cut once” could...
Abstract
The primary goal of failure analysis is to prevent the recurrence of product failures. This article discusses the sequence of activities in failure analysis and offers insight on how to gather background information, examine and assess damage, and identify the cause of the problem. It also explains where to look for evidence and how to collect samples for various types of testing. In addition, the article provides an introduction to fracture mechanics and explains how to predict and avoid fractures, including fatigue fracture, through testing and computational techniques.
Book Chapter
Factors Influencing Fractures and Fracture Appearance
Available to PurchaseBook: Fractography
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.a0006946
EISBN: 978-1-62708-387-4
.... Discontinuities The term discontinuities is used to describe a number of features that do not fit into other materials-related categories but still influence the performance of the component. Examples of typical discontinuities include laps, seams, porosity, cold shuts, hot tears, and so on. In most...
Abstract
This article describes the general factors that can influence fracture appearances. The focus is on the general practical relationships of fracture appearances, with factors presented in some broad categories, including: material conditions (e.g., crystal structure and microstructure); loading conditions (stress state, strain rate, and fatigue); manufacturing conditions (casting, metal-working, machining, heat treatment, etc.); and service and environmental factors (hydrogen embrittlement, stress corrosion, temperature, and corrosion fatigue).
Book Chapter
Surface Engineering of Aluminum and Aluminum Alloys
Available to PurchaseBook: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001308
EISBN: 978-1-62708-170-2
... be safely finished by wet barrel methods. Limitations imposed by workpiece size and shape are essentially the same as for steel and other metals. There are two general areas in which wet barrel finishing of aluminum parts is more critical than in processing similar parts made of steel. First...
Abstract
Aluminum or aluminum alloy products have various types of finishes applied to their surfaces to enhance appearance or improve functional properties. This article discusses the procedures, considerations, and applications of various methods employed in the cleaning, finishing, and coating of aluminum. These include abrasive blast cleaning, barrel finishing, polishing, buffing, satin finishing, chemical cleaning, chemical brightening, electrolytic brightening, chemical etching, alkaline etching, acid etching, chemical conversion coating, electroplating, immersion plating, electroless plating, porcelain enameling, and shot peening.
Book Chapter
Failures from Various Mechanisms and Related Environmental Factors
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003225
EISBN: 978-1-62708-199-3
... a pulsating or repeated tensile (or compressive) stress. Any other combination is known as a fluctuating stress. Stress Intensity The linear-elastic fracture-mechanics approach is based on an analytical procedure that relates the stress-field magnitude and distribution in the vicinity of a crack tip...
Abstract
Analysis of the failure of a metal structure or part usually requires identification of the type of failure. Failure can occur by one or more of several mechanisms, including surface damage (such as corrosion or wear), elastic or plastic distortion, and fracture. This leads to a wide range of failures, including fatigue failure, distortion failure, wear failure, corrosion failure, stress-corrosion cracking, liquid-metal embrittlement, hydrogen-damage failure, corrosion-fatigue failure, and elevated-temperature failure. This article describes the classification of fractures on a macroscopic scale as ductile fractures, brittle fractures, fatigue fractures, and fractures resulting from the combined effects of stress and environment.
Book Chapter
Systematic Analysis of Induction Coil Failures and Prevention
Available to PurchaseSeries: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005842
EISBN: 978-1-62708-167-2
..., profile inductors, and many other inductor styles ( Ref 1 , 2 , 3 , 4 ). Induction coil failure is a complex subject, because often there is no single factor responsible for the failure but rather a combination of interrelated factors ( Ref 5 ). At the same time, a given type of induction coil may...
Abstract
This article focuses on the frequently encountered causes of induction coil failures and typical failure modes in fabrication of hardening inductors, tooth-by-tooth gear-hardening inductors, clamshell inductors, contactless inductors, split-return inductors, butterfly inductors, and inductors for heating internal surfaces. It discusses the current density distribution and the skin effect, the proximity effect, and crack-propagation specifics. The article also describes selected properties of copper alloys, the electromagnetic edge effect of coil copper turn, and the effect of magnetic flux concentrators on coil life. It also reviews the importance of having appropriate and reliable electrical contacts.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003529
EISBN: 978-1-62708-180-1
.... This practice is in general based on ignorance of the principles of engineering, which require that a specific loss of functionality be linked to a specific deficiency in the component. On the other hand, lack of conformance to a particular requirement in no way automatically implies a cause of failure. Also...
Abstract
This article describes some of the common elemental composition analysis methods and explains the concept of referee and economy test methods in failure analysis. It discusses different types of microchemical analyses, including backscattered electron imaging, energy-dispersive spectrometry, and wavelength-dispersive spectrometry. The article concludes with information on specimen handling.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
..., which may also occur when an overload failure is caused by a combination of ductile and brittle cracking mechanisms. This section only describes the general aspects of fracture mechanisms, as more details are described in other articles in this Volume. Distinguishing characteristics of brittle versus...
Abstract
Overload failures refer to the ductile or brittle fracture of a material when stresses exceed the load-bearing capacity of a material. This article reviews some mechanistic aspects of ductile and brittle crack propagation, including a discussion on mixed-mode cracking, which may also occur when an overload failure is caused by a combination of ductile and brittle cracking mechanisms. It describes the general aspects of fracture modes and mechanisms. The article discusses some of the material, mechanical, and environmental factors that may be involved in determining the root cause of an overload failure. It also presents examples of thermally and environmentally induced embrittlement effects that can alter the overload fracture behavior of metals.
Book Chapter
Failures Related to Casting
Available to PurchaseSeries: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... life of cast components, but will give an unsatisfactory appearance or will make further processing, such as machining, more costly. Many such imperfections can be easily corrected by shotblast cleaning or grinding. Other imperfections or defects that can be more difficult to remove can...
Abstract
This article focuses on the general root causes of failure attributed to the casting process, casting material, and design with examples. The casting processes discussed include gravity die casting, pressure die casting, semisolid casting, squeeze casting, and centrifugal casting. Cast iron, gray cast iron, malleable irons, ductile iron, low-alloy steel castings, austenitic steels, corrosion-resistant castings, and cast aluminum alloys are the materials discussed. The article describes the general types of discontinuities or imperfections for traditional casting with sand molds. It presents the international classification of common casting defects in a tabular form.
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
..., embrittlement, or other factors. However, the definition of overload failure is not uniformly agreed upon. Many engineers limit the definition of overload failures to those in which the applied stresses were higher than anticipated in design. This alternate viewpoint incorrectly presumes underdesign...
Abstract
This article aims to identify and illustrate the types of overload failures, which are categorized as failures due to insufficient material strength and underdesign, failures due to stress concentration and material defects, and failures due to material alteration. It describes the general aspects of fracture modes and mechanisms. The article briefly reviews some mechanistic aspects of ductile and brittle crack propagation, including discussion on mixed-mode cracking. Factors associated with overload failures are discussed, and, where appropriate, preventive steps for reducing the likelihood of overload fractures are included. The article focuses primarily on the contribution of embrittlement to overload failure. The embrittling phenomena are described and differentiated by their causes, effects, and remedial methods, so that failure characteristics can be directly compared during practical failure investigation. The article describes the effects of mechanical loading on a part in service and provides information on laboratory fracture examination.
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001727
EISBN: 978-1-62708-178-8
... and blanks will not be useful if the sample is invalid. Accordingly, sampling uncertainty is often treated separately from other uncertainties. For random errors, the overall standard deviation, s o , is related to the standard deviation for the sampling operations, s s , and to that for the remaining...
Abstract
This article primarily considers the problem of sampling bulk materials, including minerals, metals, environmentally important substances, and industrial raw materials and waste products. It provides useful information on sample types, sampling plan, optimizing sampling resources, practical aspects of sampling, and how to ensure the quality of sampling.
Book Chapter
Material Aspects of Additively Manufactured Orthopedic Implants of Titanium Alloys
Available to PurchaseSeries: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006908
EISBN: 978-1-62708-392-8
... the starting material physicochemical properties, engineering designs, 3D-printed processing and postprocessing steps, as well as understanding of their intricate relationship with the various biomechanical and biological properties of the engineered implants. Unlike many other nonmedical-type 3D-printed...
Abstract
Additive manufacturing, or three-dimensional printing technologies, for biomedical applications is rather different from other engineering components, particularly for biomedical implants that are intended to be used within the human body. This article contains two sections: "Design and Manufacturing Considerations of 3D-Printed, Commercially Pure Titanium and Titanium Alloy-Based Orthopedic Implants" and "Device Testing Considerations Following FDA Guidance" for additive-manufactured medical devices. These are further subdivided into five major focus areas: materials; design, printing, printing characteristics and parameters as well as postprinting validation; removal of the many manufacturing material residues and sterilization; physical, chemical, and mechanical assessments of the final devices; and biological considerations of all the final devices including biocompatibility.
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
... are steel; however, many other materials are used in shaft applications. Moving shafts are often classified as either transmission shafts or machine shafts. Transmission shafts are generally cylindrical, and they transfer motion through attached componentry such as gears, pulleys, and so on. Machine...
Abstract
In addition to failures in shafts, this article discusses failures in connecting rods, which translate rotary motion to linear motion (and conversely), and in piston rods, which translate the action of fluid power to linear motion. It begins by discussing the origins of fracture. Next, the article describes the background information about the shaft used for examination. Then, it focuses on various failures in shafts, namely bending fatigue, torsional fatigue, axial fatigue, contact fatigue, wear, brittle fracture, and ductile fracture. Further, the article discusses the effects of distortion and corrosion on shafts. Finally, it discusses the types of stress raisers and the influence of changes in shaft diameter.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001272
EISBN: 978-1-62708-170-2
...” in this Volume. ASTM and other standards related to galvanized coatings are given in Table 1 . Standards relating to hot dip galvanized materials Table 1 Standards relating to hot dip galvanized materials ASTM A 123 Standard Specification for Zinc (Hot Dip Galvanized) Coatings on Iron...
Abstract
This article commences with a description of the applications of galvanized coatings and provides information on metallurgical characteristics, such as coating thickness and alloying elements. It examines the effect of galvanizing process on the mechanical properties of steels and briefly describes the cleaning procedures of iron and steel pieces, before galvanizing. The article discusses the different types of conventional batch galvanizing practices. Information on the galvanizing of silicon-killed steels is also presented. The article concludes with helpful information on batch galvanizing equipment and galvanizing post treatments.
Book Chapter
Fatigue and Fracture Properties of Aluminum Alloy Castings
Available to PurchaseBook: Fatigue and Fracture
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002407
EISBN: 978-1-62708-193-1
... had no apparent effect on crack growth rates in D357-T6. Fracture toughness, on the other hand, was actually somewhat higher for the welded material. In general, welding produces a very fine microstructure in the fusion zone of Al-Si-Mg castings. It also tends to produce a distribution of very...
Abstract
This article reviews the fatigue and fracture properties of aluminum alloy castings, specifically alloys A356 and A357/D357 (all-T6) and alloy A201-T7, from the perspective of both design and manufacturing considerations. In addition, it provides an overview of the roles played by microstructure, manufacturing processes, test conditions, and casting design in determining the fatigue and fracture properties of aluminum casting alloys.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005324
EISBN: 978-1-62708-187-0
..., as in Table 1 . The new designation relates to tensile strength, with SI being the primary units. ISO standard 1083 offers hardness classes (with an “HBW” suffix) in an annex applicable upon agreement of manufacturer and purchaser. The hardness values given in Table 1 are for information only. Other...
Abstract
This article begins with a description of the classes and grades of ductile iron. It discusses the factors affecting the mechanical properties of ductile iron. The article reviews the hardness properties, tensile properties, shear and torsional properties, compressive properties, fatigue properties, fracture toughness, and physical properties of ductile iron and compares them with other cast irons to aid the designer in materials selection. It concludes with information on austempered ductile iron.
Book Chapter
Principles of Induction Hardening and Inspection
Available to PurchaseSeries: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005863
EISBN: 978-1-62708-167-2
... limited in this article. However, several other articles in this Volume cover more material related to certain aspects of induction hardening, including: Metallurgy of induction hardening Induction hardening of axle shafts Induction hardening of crankshafts and camshafts Induction hardening...
Abstract
Induction hardening of steel components is the most common application of induction heat treatment of steel. This article provides a detailed account of electromagnetic and thermal aspects of metallurgy of induction hardening of steels. It describes induction hardening techniques, namely, scan hardening, progressive hardening, single-shot hardening, and static hardening. The article discusses the techniques used to control the heat pattern, and provides a brief review of quenching techniques used in the induction hardening. It provides guidelines for selecting the frequency and power for induction hardening, and describes common methods for measuring case depth, such as optical and microhardness, and surface hardness. It provides information on some complications and ambiguities associated with these measurements. The article also discusses the commonly used non-destructive testing methods, namely, magnetic particle testing, ultrasonic testing, and eddy current testing to evaluate induction-hardened components.
Book
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.9781627082006
EISBN: 978-1-62708-200-6
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