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fatigue crack growth testing

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Published: 01 December 1992
Fig. 18 Log-log da/dN versus delta K fatigue crack growth-rate test results for 310 MPa (45 ksi) maximum stress and stress ratio of 0.73. The scatterband (two parallel lines) is for quenched and tempered martensitic steels from NCHRP 12–14. Note that the A517 grade, F, plate D, test results More
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
... of the propagating cracks in all disks subjected to spin-pit testing. Fig. 14 Loading cycles used in spin-pit testing. (a) Constant-amplitude idle-max-idle duty cycle. (b) Variable-amplitude duty cycle. The constant-amplitude loading fatigue crack growth data for a bolt hole crack in disk 2...
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
... was considered to be critical to aircraft safety, the Royal Australian Air Force (RAAF) requested that the crack growth rate during service be determined. Applications At the time, the Mirage III-0 was the main fighter aircraft in service with the RAAF. The results of a full-scale fatigue test indicated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... to growth on a slant plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 Fig. 13 Aluminum alloy fracture mechanics test specimen, 6.3 mm (0.25 in.) thick. Fatigue crack at left of arrows is flat and perpendicular...
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
..., because plastic strain is a required condition for fatigue, strain-controlled testing offers advantages in the characterization of fatigue crack initiation (before subsequent crack growth and final failure). The S - N method is based on just one failure criterion: the total separation of the test coupon...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... under cyclic loading Fig. 35 Striations observed by scanning electron microscopy on rotating-beam fatigue specimen made of cold-worked electrolytic tough pitch copper. Crack growth direction is from upper right to lower left, and specimen was tested at relatively high stress. Fig. 36...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
... prepared per ASTM E64781, machined such that the crack would propagate transverse to the rolling direction. In this test the fatigue crack length, a, is determined as a function of fatigue cycles, N. This data is plotted in the form of da/dN versus K, where da/dN is the fatigue crack growth rate...
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
... the center of the shaft cross section. Compact-tension specimens, 25.4 and 6.25 mm (1 and 0.25 in.) thick, were used for fracture toughness and fatigue crack-growth rate testing. In addition, 12.5 by 50.8 mm (0.5 by 2 in.) center-crack-tension specimens were also machined from the central region of another...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001558
EISBN: 978-1-62708-217-4
... organization, being complex mixtures of cleavage and fatigue. Much study of these areas convinced the author that there are four major episodes of stable crack growth represented. Cracking in area A will be discussed in some detail, but area B is essentially similar. Cracking initiated in area...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
... loading spectrum for fatigue and damage-tolerance analysis and test. This has led to much effort being expended to quantitatively define how the variation of key spectrum parameters affect crack growth life ( Ref 18 ). The key question remains how closely a design spectrum must simulate real life usage...
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
... i + N p + N f Note that once a crack of engineering importance initiates, fast fracture may occur in a sudden and catastrophic manner. In that case, the component exhibited effectively no fatigue crack growth, and N p = 0. It is important to define failure for each component...
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
... Abstract Macrofractographs of the fracture surface from a multibladed fan showed that cracks started at the corner where bending stress was concentrated and propagated through the blade by fatigue. Peak stress at the monitoring position was less than 10 MPa. To simulate crack growth, the rotor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001537
EISBN: 978-1-62708-234-1
... Abstract After completing a fatigue test of an aluminum alloy component machined from a 7079-T6 forging, technicians noted a 5 in. crack which ran longitudinally above and through the flange. When the fracture face was examined by light microscopy, observers could not ascertain the exact mode...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001024
EISBN: 978-1-62708-214-3
... 6061-T651 aluminum alloy extrusion and 26 fiberglass “pockets” that provided the trailing-edge airfoil shape. Visual examination of the fracture surface of the aluminum extrusion indicated fatigue crack growth followed by ductile overload separation. Examination of the fatigue fracture region revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047590
EISBN: 978-1-62708-217-4
... arc) welding. It was found that the tube had failed in the HAZ. Examination of a plastic replica of the fracture surface in a transmission electron microscope established that the crack origin was at the outer surface of the tube. The crack growth was by fatigue; closely spaced fatigue striations were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
... of difference of microstructure parameters among materials tested on mechanical properties is less marked than that of carbon content. The resistance of fatigue crack growth is affected by the effective grain size (or fatigue crack growth mean free path between two obstructors), such as ferrite grain size...
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
... time for 2.25Cr-1Mo steel at 538 °C (1000 °F) was derived from tests conducted at elevated temperature described in Ref 14 . The data are presented in Fig. 13 , and the equation relating fatigue crack growth rate to the applied magnitude of Δ K and the hold time, t h , expressed in hours is given...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... for fatigue crack growth during service. It was recommended that the damaged undercarriage struts be withdrawn from service pending further analysis and development of a repair technique. Crack propagation Military planes 35NCD16 Surface treatment related failures Intergranular fracture Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001366
EISBN: 978-1-62708-215-0
... of the fatigue specimen fracture surface revealed relatively smooth-textured transgranular crack growth ( Fig. 11 ); there was no evidence of crystallographic propagation. Fig. 11 Scanning electron micrograph of fracture surface from fatigue specimen excised from impeller, showing typical high-cycle...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001027
EISBN: 978-1-62708-214-3
... the yoke in the region of the cracking indicated that the failure was caused by fatigue-crack initiation and growth from severe corrosion damage to a pillow-block bolt hole. Corrosion occurred because of failure of the protection scheme. An upgraded corrosion protection scheme for the bolt holes...