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Microstructure modeling

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... of loading: in-phase and out-of-phase cycling. The article illustrates the ways in which damage can interact at high and low temperatures and the development of microstructurally based models in parametric form. It presents a case study of the prediction of residual life in a turbine casing of a ship through...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001816
EISBN: 978-1-62708-241-9
... of the creep tension stress and the strain rate suffered by the polycrystalline arrangement [ 1 ]. Two mechanisms are considered to take place in the material: grain boundary migration and grain boundary shearing/sliding. Theoretic and microstructural models agree that the most important feature...
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
... concentrated by the pileup becomes equal to approximately 75% of the shear modulus. This requires between 100 and 1000 dislocations, a not unreasonable number in either bulk material or in second phases in a two-phase microstructure. Fig. 3 Dislocation models for cleavage fracture. (a) Elastic crack...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001817
EISBN: 978-1-62708-241-9
... of intermediate improper microstructures [ 2 ]. In addition to the financial losses, failure of wire ropes may cause catastrophic events. During the past few decades, many researchers have studied the modeling and failure of wire ropes. Parameswaran et al. [ 3 ] investigated the failure of the outer z-shaped...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001845
EISBN: 978-1-62708-241-9
... led an investigation that included fractographic and microstructural analysis, hardness testing, inductively coupled plasma spectroscopy, and finite-element analysis. The fracture was shown to be brittle in nature and covered with oxide flakes, but no other flaws relevant to the failure were observed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001760
EISBN: 978-1-62708-241-9
... Observation Results Measurements Material Investigation Finite Element Modeling Conclusion Acknowledgments References References 1. Aluminium and Aluminium Alloys - Castings - Chemical Composition and Mechanical Properties , Standard No. DIN-EN-1706( 1998 ) 2. AlSi9Cu3 Aluminum...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001308
EISBN: 978-1-62708-215-0
... and the fractographic analysis of the crack—the cyclic loads on the rail were negligible, the environment benign, and the corrosion products seen on the fracture surface were judged by their appearance and location to have developed some time after crack formation. Examination of the steel microstructure provided...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... thermomechanical fatigue testing. Image shows surface oxidation at bottom and oxide spike forming in the center of the specimen. Chemical etchant used highlights aluminum in the microstructure. Microstructure shown as white in image is depleted of aluminum as a result of aluminum diffusion to surface. Source: Ref...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001786
EISBN: 978-1-62708-241-9
.... , A new model for hydrogen-assisted cracking (hydrogen “embrittlement”) . Metall. Trans. 3 , 437–451 ( 1972 ) 10.1007/BF02642048 7. Pilkey W.D. , Peterson’s Stress Concentration Factors , 2nd edn. ( Wiley , New York , 1997 ) 10.1002/9780470172674 8. Talukdar P. , Sen...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001777
EISBN: 978-1-62708-241-9
...) identification of the main regions of the structure directly affected by the initiation of the collapse; (c) sampling of key parts for evaluation through mechanical tests (hardness, tensile, and Charpy tests), fractography, and microstructural characterization; (d) structural analysis using computational models...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
...Abstract Abstract This article provides an overview of fractography and explains how it is used in failure analysis. It reviews the basic types of fracture processes, namely, ductile, brittle, fatigue, and creep, principally in terms of fracture appearances, such as microstructure. The article...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001852
EISBN: 978-1-62708-241-9
.... With the help of finite element modeling, they analyzed the material as well as the design and in-service application of the mold. They discovered that overconstraining the mold, while it was in service, caused excessive thermal stresses which accelerated crack initiation and propagation. Investigators also...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... that indicate the dynamics of a fracture event (quasi-static versus dynamic/impact loading) In this article, the basic types of fracture processes (ductile, brittle, fatigue, and creep) are described briefly, principally in terms of fracture appearances (as sometimes affected by the microstructure). More...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001839
EISBN: 978-1-62708-241-9
... to routine inspection and testing before dispatching the lot to the customer’s and as such, revealed no abnormalities with respect to the microstructure and mechanical properties, what so ever. However, a pronounced loss of tensile ductility was observed in steel samples, which were sent back by the customer...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
....2011.08.012 32. Slack T. and Sadeghi F. , Explicit Finite Element Modeling of Subsurface Initiated Spalling in Rolling Contacts , Tribol. Int. , Vol 43 ( No. 9 ), 2010 , p 1693 – 1702 10.1016/j.triboint.2010.03.019 33. Voskamp A.P. , “ Microstructural Changes during...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.9781627082952
EISBN: 978-1-62708-295-2
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
... in a two-phase microstructure. Fig. 3 Dislocation models for cleavage fracture. (a) Elastic crack regarded as a pileup of edge dislocations. (b) Pileup against a boundary forming a crack. (c) Crack forming by movement of dislocations on two slip planes. (d) Crack formation at tilt boundary. Source...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001021
EISBN: 978-1-62708-214-3
... Simulation Tests The use of simulation specimens permitted real crack growth rate data to be determined for the configuration of interest. It also allowed accelerometer data from the crashed aircraft to be used in a crack growth model to establish a correlation between real fatigue progression markings...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001850
EISBN: 978-1-62708-241-9
... inspection, chemical analysis, microstructural characterization, and mechanical property testing. The pipe was made from nonresulfurized carbon steel as specified and was lined with an alumina refractory. Visual inspection revealed cracks in the refractory lining, which corresponded with the location...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001596
EISBN: 978-1-62708-225-9
... the fatigue life. Based on an understanding of the compressor motion, a Monte Carlo model was developed based on a linear damage theory to predict the fatigue life of the springs during start/stop conditions. The results of this model were compared to actual test data. The model showed that the design...