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critical stress intensity

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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.c9001383
EISBN: 978-1-62708-215-0
... growth until final fracture. The natural stress concentration at the thread root, when tightened to the required clamp load concomitant with the presence of cracks in the carburized case, was sufficient to exceed the critical stress intensity for hydrogen-assisted stress cracking (HASC). The zinc plating...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001148
EISBN: 978-1-62708-228-0
... and was not a factor in the pipeline failure. Application of Fracture Mechanics Analysis The application of fracture mechanic in this failure analysis was as follows: (1) use calculated principal normal stress and measured critical flaw size to determine the critical stress intensity of steel at fracture origin...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0006548
EISBN: 978-1-62708-180-1
... Kapp apparent fracture toughness Kc plane-stress fracture toughness or critical stress intensity kf fatigue notch factor KI Mode I stress-intensity factor KIc plane-strain fracture toughness KISCC threshold stress intensity for stress-cor- rosion cracking Kr ratio of applied stress-intensity factor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001672
EISBN: 978-1-62708-236-5
... at the seam was mostly mode III. Although some deviation from this stress state can occur [ 3 ] at, or near, the crack tip, the fracture process will still be dominated by mode III [ 4 ]. Therefore, K IIIc , the critical stress intensity factor for the mode III stress state, is important in any fracture...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... analyzed. These four test axles provide a valuable basis with which valid critical stress intensities, K IC , can be calculated. All tests should be valid because the yield stress is high in the outer case, there was no evidence of crack opening displacement (CTOD) at the case/core transition...
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
... in Net stress ratio Initial Final Maximum ( S c ) Onset ( S o ) Apparent ( K app ) Critical ( K c ) Onset ( K o ) Apparent Critical Onset Specimen width, 8.0 in. 1 2.660 3.600 31.30 19.10 68.73 (a) 85.36 (a) 41.94 0.890 1.080 0.543 2 4.770 5.750 19.20 17.10...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
... anticipated during design? Was there some deficiency or discontinuity that contributed to the failure, or was there a local stress raiser at the critical location? Was this taken into account by the designer? Of course, the root causes of unacceptable stress concentrators are varied. They may occur from...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001053
EISBN: 978-1-62708-214-3
..., but was estimated from the Charpy toughness, assuming that the critical stress-intensity factor is roughly 15.5 times the square root of the Charpy value on the lower shelf. The value for K Ic , at the failure temperature, obtained in this manner was 37.4 MPa m (34 ksi in. . Stress Analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001544
EISBN: 978-1-62708-219-8
... the material met chemical and mechanical property requirements, tests showed it had low fracture toughness and critical-sized flaws oriented normal to the principal stress in the failed junction piece. Fabrication procedures resulted in high residual stresses and a metallurgical notch at the radius...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... of a through thickness crack in a plate Fig. 20 Stress distribution ahead of crack in which small-scale plasticity is included Fig. 21 Stress intensity factors (in tension, k I ) for various crack geometries. (a) Surface crack. (b) Embedded crack. (c) Through-thickness crack. (d) Flaw...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006944
EISBN: 978-1-62708-395-9
... intensity factor, K. The critical instability is given by: (Eq 6) K C = Y . σ C π a c where K C is critical stress intensity, Ϭ C is critical stress, a c is critical crack size, and Y is a geometry factor. The value of a critical stress intensity determined under a plain-strain...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... are accommodated in Levels 2b and 2c as in Level 2a (i.e., Eq 15 , 16 , and 17 ). There is no safety factor inherent to either Level 2b or 2c FAC, and they should be considered critical in the assessment. It should be noted that, as in Levels 1 and 2a, only the elastic stress-intensity factor K I...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001056
EISBN: 978-1-62708-214-3
.... The results were used in a fracture mechanics analysis for critical crack size calculations. Stress Analysis Analytical As indicated above, the thermal fatigue process was believed to originate because of fluctuations in a stratified coolant layer. The temperature of the inner wall surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001605
EISBN: 978-1-62708-217-4
... curve. Ref 1 , 2 , 3 The integration of this curve led to the crack propagation curve ( Fig. 12 ). Comparison of the derived crack propagation ( dl/dN ) spacing data with published values showed that the crack propagation was not in the critical stress-intensity range for most of the investigated...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... affected by the monotonic fracture process associated with the maximum portion of the loading cycle as it approaches a critical stress-intensity level ( Ref 61 , 83 , 94 ). In general, these polymers are susceptible to crazing, chain scission, fibrillation, or cross-link rupture. For these polymers...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046210
EISBN: 978-1-62708-235-8
... fatigue crack. The scale markings are 0.1 in. Fracture Mechanics Approach In principle, the stresses can be computed by measuring the final crack size and shape and noting that at fracture the stress intensity parameter is equal to the plane-strain fracture toughness K Ic . The problem...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001275
EISBN: 978-1-62708-215-0
... Fracture toughness was measured using fatigue precracked compact tension specimens and the resistance curve J integral approach of ASTM E 813-81. The critical value of J , J IC , at crack propagation was found to be 3.08 kJ/m 2 (3.52 ft. .lbf/in. 2 ). Stress Analysis There are several loads...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006921
EISBN: 978-1-62708-395-9
... information is available to calculate the stress intensity factor. In fracture mechanics, the assumption is that once the crack reaches a certain size, catastrophic failure will result. The stress intensity factor associated with this point is termed the critical stress intensity factor, or K Ic...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
... of the critical plane parameter ( Ref 70 ) for neat thermoplastics was used to correlate the multiaxial fatigue data in the literature. The results showed desirable correlations based on fiber orientation, mean stress, and stress concentration ( Ref 76 ). Fatigue Crack Initiation The total fatigue life...