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Fatigue strength

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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.c9001794
EISBN: 978-1-62708-241-9
... the design calculations, thus causing the initiation of the cracking. Moreover, although the shaft had been quenched and tempered, its actual hardness did not have the optimal value for long-term fatigue strength. drive shaft fatigue fracture rotating-bending variable stress 4340 low-alloy...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001042
EISBN: 978-1-62708-214-3
... was recommended that improved assembly procedures be used and that, if another failure occurred, a steel of higher fatigue strength be used. Vehicles Leaf springs 304 UNS S30400 Fatigue fracture Fractography clearly established that failure occurred by fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
... be fatigue cracking that initiated at the toes of the fillet welds. Secondary fatigue cracking occurred at the torque rod mounting holes. Failure was attributed to cyclic stresses at the weld toes that exceeded the lowered fatigue strength at this location. A design change that eliminated the fillet...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... plating removal by acid etching. Post-plating baking operations subsequently reduced the fatigue strength of the spar. Chemical etching Fatigue strength Mechanical properties Rotor blades 7075-T7351 UNS A97075 Pitting corrosion Fatigue fracture Surface treatment related failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048060
EISBN: 978-1-62708-224-2
... which indicated that the material was in the as-forged condition (which meant lower fatigue strength). The fracture was concluded to have occurred due to stress concentration in the root of the last thread. Normalizing of the crane hook after forging was suggested as a corrective measure. A stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047414
EISBN: 978-1-62708-233-4
... Abstract There was a fracture of an anchor link that rides on a post with a spherical surface. No bevel or radius was called for, leaving an extremely sharp edge. A fatigue crack grew from the top sharp edge. The casting had good toughness and strength (1448 MPa, or 210 ksi, tensile strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048031
EISBN: 978-1-62708-224-2
... result of abrasion, a hard layer of martensite was formed on the wire. The wire was made susceptible to fatigue cracking, while bending around the sheave, by this brittle surface layer. The carbon content and tensile strength of the wire was found lower than specifications. As a corrective measure, this...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
... Abstract A structure had been undergoing fatigue testing for several months when a post-like member heat treated to a tensile strength of 1517 to 1655 MPa (220 to 240 ksi) ruptured. The fracture occurred in the fillet of the post that contacted the edge of a carry-through box bolted to the...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
..., resistance to fatigue fracture was required. A common correlation is that the higher the tensile strength, the higher the fatigue strength. Thus, the use of cold-worked stainless steel appears reasonable. No data were found to show that this correlation was valid for cold-worked 316L stainless steel. Indeed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... cold-worked condition. It has been established that cold-worked austenitic stainless steels lose their fatigue strength when notched. It has also been established that austenitic stainless steels in the annealed condition are not sensitive to notches. Cold-worked material is very notch sensitive, with...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047681
EISBN: 978-1-62708-229-7
... origin and at other random points confirmed that metal expulsion from the resistance welds was generally present. The surface imperfections created by the metal expulsion provided points of stress concentration that lowered the fatigue strength and led to failure in experimental testing. The stator...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001788
EISBN: 978-1-62708-241-9
... and prevention of die failure, and subsequently in improving process economics. In die fracture-failure, there are two common modes: one is overload fracture and the other is fatigue fracture. The large deformation load that exceeds the strength limit of the die in the forming processes can cause...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001359
EISBN: 978-1-62708-215-0
..., fused particles from striking the blade surface. Aerospace engines Fatigue strength Forgings IMI 550 Ti-4Al-4Mo-4Sn-0.5Si Surface treatment related failures Fatigue fracture Several high-pressure compressor blades used in the first stage of an aeroengine exhibited low...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047100
EISBN: 978-1-62708-233-4
... fatigue origins with a high stress concentration due to the sharp radius. The final-fracture area is near the surface (outside diameter) opposite the initiation site; therefore, the stress that caused failure was probably not much above the fatigue strength of the material. This near-to-normal stress...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001764
EISBN: 978-1-62708-241-9
... subjected to cyclic loading can be predicted using the relationship:[ 3 , 4 ] (Eq 2) N = 1 2 σ a σ f ′ 1 / b where N is the number of loading cycles until failure, σ a is the stress (torque) amplitude, σ f ′ is the fatigue strength coefficient (material...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001570
EISBN: 978-1-62708-220-4
... provides the strength. The titanium tubes most frequently are joined to the tubesheet by grooving the tube holes and expanding the tube material in the backing plate 1 . The plastic deformation of tube material in the grooves increases the holding strength of the joint and also seals off the gap between...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
... evidence of material deficiencies, fabrication defects, or corrosion was observed. Instead, multiple initiation sites and the lack of any anomalies or defects associated with these sites suggested that the fatigue strength of the wheel material had simply been exhausted. Fatigue analyses accurately...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001040
EISBN: 978-1-62708-214-3
... very low mileage under a normal load situation. The axle was made of AISI 4140 steel oil quenched and tempered to AAR specification M101. Specified mechanical properties were: ultimate tensile strength, 830 MPa (120 ksi) (min); yield strength, 690 MPa (100 ksi) (min); elongation, 15% (min). Two...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001386
EISBN: 978-1-62708-215-0
..., showing holddown bolts The load cells were manufactured from type 420 stainless steel and were fully hardened. At the observed hardness levels, an ultimate strength of 1720 MPa (250 ksi) and a yield strength of 1480 MPa (210 ksi) would be expected. A martensitic stainless steel was...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001051
EISBN: 978-1-62708-214-3
... walls was probably caused by the combined effect of oxygen with the copper species, promoting a more oxidizing potential in solution. Although the relative importance of residual stresses in fatigue life has been argued extensively, it is generally accepted that fatigue strength increases when the...