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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001302
EISBN: 978-1-62708-215-0
..., especially with respect to the accuracy of the optical pyrometer temperature readout. Also, procedures must be developed such that forging blanks that trigger the over-temperature alarm are reliably and permanently removed from the production line. Crack propagation Forging defects Mechanical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001663
EISBN: 978-1-62708-236-5
... Abstract Personnel responsible for laboratory protection at some plants are required to participate in exercises simulating a breach of security at the site. This document reports a metallurgical investigation of blank firing adapters (BFA), one of which exploded during such a training exercise...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006801
EISBN: 978-1-62708-329-4
... in understanding both necking and splitting. Splits typically open between 0 and 45° to the direction of load application, but this is complicated by complex blank and part shapes, die process, and metal flow. Splits are not found on critical radii but instead can be seen at the tangent point between the radii...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001576
EISBN: 978-1-62708-219-8
.... Air compressors Burrs Fan blades Stress concentration Cold-rolled steel Fatigue fracture Overview of Blade Failure Some one thousand fans were used on large axial compressors for shop ventilation for about one year. Out of them two fans developed cracks on the blades. The rotor of the fan...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0009222
EISBN: 978-1-62708-180-1
... not be satisfactory for producing steel blanks of the same size. Handbooks list many empirical design rulesfor the development of tool geometry. Our findings, however, disclose that two simple factors—improper control of sharp corners and use of extreme section changes—are most frequently responsible for design...
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
... Abstract Flow forming technology has emerged as a promising, economical metal forming technology due to its ability to provide high strength, high precision, thin walled tubes with excellent surface finish. This paper presents experimental observations of defects developed during flow forming...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001360
EISBN: 978-1-62708-215-0
... full hard temper, the blades are blanked and the rivet holes are pierced. The blades are then lightly rolled to impart a slight curvature. Finally, the blades are stress relieved. Visual Examination of General Physical Features Examination of the fan ( Fig. 1 ) revealed that it was dirty from...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
..., straightening, sizing, etc.). These metalworking operations have a two-fold purpose. First, they are obviously designed to produce parts with the desired configuration. Secondly, metalworking can develop a final shape with internal soundness and improved mechanical properties by: Improved internal quality...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... cracks. Although they extend laterally into the matrix metal, they are deeper than they are wide, showing that the fracture fronts did not develop at a uniform rate in all directions in their early stages. The orientation of these origins is normal to the direction of resultant tensile stress from...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
... Abstract This article provides background information needed by design engineers to create part designs optimized for plastics and plastic manufacturing processes. It describes the four essential elements of plastic part development, namely, material, process, tooling, and design, and provides...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001848
EISBN: 978-1-62708-241-9
... hardened, and tensile stresses may develop below the surface. These will generate cracks on the surface, and at some point, these will emerge at the surface revealing a network of cracks [ 3 ]. Even though the stresses may be quite negligible, their cumulative effect after millions of stress cycles may...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... with rate of sliding as well as with pressure. If both pressure and sliding speeds are excessive, the frictional heat developed can cause destruction of tooth surfaces. This pressure-velocity factor, therefore, has a critical influence on the probability of galling and scoring of gear teeth. The permissible...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
... service life. Figure 25(a) shows a chromium-plated blanking die made from AISI A2 tool steel that cracked after limited service. Cold etching ofa disk cut from the blanking die revealed a light-etching layer that is particularly prominent at the working face and along the adjacent sides ( Fig. 25b...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006818
EISBN: 978-1-62708-329-4
...-plated blanking die made from AISI A2 tool steel that cracked after limited service. Cold etching of a disk cut from the blanking die revealed a light-etching layer that is particularly prominent at the working face and along the adjacent sides ( Fig. 25b ). Fig. 25 Failed chromium-plated blanking...
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
..., the importance of investigating failures is vividly illustrated in the pioneering efforts of the Wright Brothers in developing self-propelled flight. In fact, while Wilbur was traveling in France in 1908, Orville was conducting flight tests for the U.S. Army Signal Corps and was injured when his Wright Flyer...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... MANUFACTURING (AM) refers to a group of free-form fabrication technologies that incrementally build up a solid part by computer-controlled deposition of material from a digital solid model. The technology is an outgrowth and broadening of rapid prototyping methods that were developed in the 1980s to accelerate...
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
... are well documented. For example, the importance of investigating failures was vividly illustrated in the pioneering efforts of the Wright Brothers in developing self-propelled flight. In fact, while Wilbur was traveling in France in 1908, Orville was conducting flight tests for the U.S. Army Signal Corps...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
... development costs and timing. The first step in selecting an appropriate manufacturing process for the function and properties of the specific plastic part is to establish accurate functional requirements. Once these are established, the materials that meet these requirements can be selected. The next...
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
... to rapidly developing dislocation theory as well as rapidly developing concepts in fracture mechanics, starting with Griffith’s model for brittle fracture. First attempts at rationalizing the problem of brittle fracture by normal separation across a plane used Griffith’s criterion for brittle 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
... of the work accomplished to 1940 was subsequently reexamined in light of rapidly developing dislocation theory as well as rapidly developing concepts in fracture mechanics, starting with Griffith's model for brittle fracture. First attempts at rationalizing the problem of brittle fracture by normal separation...