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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001797
EISBN: 978-1-62708-241-9
... was shown both theoretically and experimentally that a cracked cam causes an overall reduction in stiffness. To further probe the effect, investigators derived an analytical formula expressing the time varying stiffness of a cam-follower system. They also succeeded in quantifying the relationship...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001144
EISBN: 978-1-62708-217-4
... aircraft was landed. The helicopter main rotor blade spar fracture was analyzed by conventional and advanced computerized fractographic techniques. Digital fractographic Imaging Analysis of theoretical and actual fracture surfaces was applied for automatic detection of fatigue striation spacing. The...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003523
EISBN: 978-1-62708-180-1
... generated from theoretical modeling. The paper and/or computer-generated models rely heavily on having the correct data input. False input data result in inaccurate model results. Testing of actual components, in most cases, requires different assumptions to be made, specifically that the arrangement of the...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006772
EISBN: 978-1-62708-295-2
... than a large-scale accident. The approach presented is that the analysis and reconstruction is based on the physical evidence. The article provides a brief review of some general concepts on the use and limitations of advanced data acquisition tools and computer modeling. Legal implications of...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001851
EISBN: 978-1-62708-241-9
... Subject to a Misalignment and Unbalance, Part 1: Theoretical Model and Analysis ,” J. Sound Vib. , 1994 , 176 , pp. 663 – 679 10.1006/jsvi.1994.1405 . 2. Perreira N.D. and Dubowsky S. : “ Analytical Method to Predict Noise Radiation from Vibrating Machine Systems ,” J. Acoust. Soc...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... = 1.4, c = −1.9, and d = 0.48. This indicates that the erosion rate increases as the hardness of the surface material increases and the fracture toughness of the surface material decreases. These exponents were compared to theoretical models based on elastic-plastic fracture ( Ref 57 , 58 ), and...
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
... 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 of this behavior is the grain boundary sliding (GBS). Nevertheless, dislocations or diffusion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... classification is based on the two-term model that divides wear mechanisms into interfacial and bulk or cohesive. The second is based on the perceived wear mechanism. The third classification is specific to polymers and draws the distinction based on mechanical properties of polymers. In this classification...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... that the fracture originated near the blade-to-hub attachment in the area of the weld buildup. Specimens from four failed castings and from an impeller that had developed cracks prior to design modification were subjected to a complete analysis. A number of finite-element-method computer models were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001606
EISBN: 978-1-62708-226-6
... four of the implants. In every instance, the fatigue cracks initiated from the attachment screw holes at the reduced cross sections of the implants. Two fixation implant designs were analyzed using finite-element modeling. This analysis confirmed the presence of severe stress concentrations adjacent to...
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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001619
EISBN: 978-1-62708-225-9
.../0043-1648(90)90152-Z 5. Yang B. and Mall S. : “On Crack Initiation Mechanisms in Fretting Fatigue,” J. Appl. Mech. (Trans. ASME) , 2001 , 68 , pp. 76 – 80 . 10.1115/1.1344901 6. Lamacq V. , Dubourg M.C. , and Vincent L. : “A Theoretical Model for the...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001621
EISBN: 978-1-62708-227-3
.... Mech. (Trans. ASME) , 2001 , 68 , pp. 76 – 80 . 10.1115/1.1344901 3. Lamacq V. , Dubourg M.C. , and Vincent L. : “A Theoretical Model for the Prediction of Initial Growth Angles and Sites of Fretting Fatigue Cracks,” Tribol. Int. , 1997 , 30 ( 6 ), pp. 391 – 400...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001807
EISBN: 978-1-62708-241-9
... the rolling element bearing. Lundberg and Palmgren [ 3 , 4 ] proposed the first theoretical model for the computation of bearing’s life. They supposed that cracks may initiate at a depth below the surface where the maximum orthogonal shear stress and a weak point in the material occurs simultaneously...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001620
EISBN: 978-1-62708-229-7
... 4. Lamacq V. , Dubourg M.C. , and Vincent L. : “A Theoretical Model for the Prediction of Initial Growth Angles and Sites of Fretting Fatigue Cracks,” Tribol. Int. , 1997 , 30 ( 6 ), pp. 391 – 400 . 10.1016/S0301-679X(96)00068-0 5. Costa J.D. , Ferreira J.M...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... embrittlement and a lowering of the threshold stress intensity for subsequent crack growth. Figure 10 is an illustration of a theoretical model depicting this mechanism. Fig. 10 Theoretical model of hydrogen-assisted crack originating at inclusion cluster. (Left) Uniaxial load (σ) applied to tensile...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001601
EISBN: 978-1-62708-235-8
... the strain produced by elastic recovery 8 and can cause dimensional distortions. When the load is released, elastic recovery will take place and spring back will occur ( Fig. 14 ). Fig. 14 Stress-strain curve for ductile material There is no theoretical model available to accurately...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
.... , A Fracture Mechanics Approach to Wear , Wear , Vol 61 , 1980 , p 125 – 132 23. Keer L.M. and Bryant M.D. , A Pitting Model for Rolling-Contact Fatigue , J. Lubr. Technol. (Trans. ASME) , Vol 105 , 1983 , p 198 – 205 10.1115/1.3254565 24. Bryant M.D...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... decreasing fracture toughness of the surface material. These exponents were compared to theoretical models based on elastic-plastic fracture ( Ref 63 , 64 ), and rough agreement was found ( Ref 62 ). The variation of erosion as a function of impact angle for brittle materials is shown in Fig. 1 . Equation...