Initial Experimental Investigation of Tearing Instability Theory

Paris, Paul C.; Tada, Hiroshi; Ernst, Hugo A.; Zahoor, A.

doi:10.1520/stp35834s

Cited by 39 publications

(8 citation statements)

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“…A complete presentation of these results is too lengthy for this publication, and is found elsewhere [17].…”

Section: Resultsmentioning

confidence: 99%

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Strain hardening and stable tearing effects in fitness-for-service assessment :

Read¹

1987

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“…A complete presentation of these results is too lengthy for this publication, and is found elsewhere [17].…”

Section: Resultsmentioning

confidence: 99%

“…In ductile fracture, instability has been defined as "a sudden increase in crack size and deformation of the test specimen" [17]. In J-R curve measurements or in studies of tearing instability using standard testpieces, tearing typically starts after the maximum load is reached.…”

Section: Local and Global Instabilitymentioning

confidence: 99%

Strain hardening and stable tearing effects in fitness-for-service assessment :

Read¹

1987

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“…Calculations of Tl~ have 2-4 applied been accomplished by Paris and coworkers for several simple geometries. The tearing instability theory of Paris 2 states that a flawed member will tear stably when it is beyond JNc' and at its limit load, as long as Taple< Tteial' Tearing instability will occur whenever T aple T material' The objective of this investigation is to evaluate the validity of the Paris tearing instability theory by testing a series of compact specimens in a test apparatus of variable compliance. A range of materials including aluminum, titanium, and steel alloys were chosen to encompass a broad range of elastic moduli.…”

Section: C1mentioning

confidence: 99%

“…Previous work of this type has been completed for one type of steel using bend specimens by Paris et al 8 For all tests, the J integral size criteria 9 were met to keep the tests initially in the region of J-controlled growth.…”

Section: C1mentioning

confidence: 99%

An Experimental Evaluation of Tearing Instability Using the Compact Specimen

Joyce

Vassilaros²

1981

Fracture Mechanics

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The objective of this investigation was to produce experimental verification of the tearing instability theory proposed by Paris and co-workers [10].3 This theory states that ductile crack extension will occur in an unstable fashion whenever the applied tearing force is greater than the material tearing resistance. In this investigation a series of compact specimens of aluminum, titanium, and steel alloys was tested in a variably compliant test machine to generate a range of applied tearing force. The material tearing resistance was measured from the JI-R curves of the stable specimens and compared with the applied tearing force necessary to generate ductile tearing instability in each material. The Paris theory was found to accurately predict the onset of gross instability behavior. Some limited instability behavior was found, however, at values of tearing force less than the average material tearing resistance obtained from an unloading compliance JI-R curve test. Limited instability behavior was characterized by repeated short steps of rapid but ductile crack extension, separated by regions of slow stable tearing.

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“…A number of parameters have been tried as a candidate to characterise the crack growth. The important among these are the crack opening displacement (COD) [7][8][9][10][11][12], crack opening angle (COA) [7-12, 21, 44], J-integral [7,21,38], tearing modulus [20], J-integral [34,35], specific work of crack extension [14][15][16]18], final stretch [13], stretch zone width [39], etc. Both static and dynamic loadings have been considered.…”

Section: Introductionmentioning

confidence: 99%

Experimental and finite element study on stable crack growth in three point bending

Maiti

Keshbat

1993

Int J Fract

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Experimental and finite element results are presented on mode I and mixed mode (involving I and II only) stable crack growth under static loading through an aircraft grade aluminium alloy (D16AT) in three point bending. The results include load-displacement diagrams, J-integrals, plastic zones, tunneling (or crack front curving), etc. During experiment a substantial amount of tunneling is observed, the extent of which increases as the extension progresses in both mode I and mixed mode. The tunneling reduces as ao/w increases. The crack extends initially almost along a straight line at an angle with the initial crack in a mixed mode. The maximum load is observed to be as high as 1.6 times the initiation load in the whole range examined. From the finite element study it is seen that, in a mixed mode, the J-integral at the onset of extension is the lowest compared with the values at the later stages. The plastic zone size grows as the stable extension progresses; the growth is approximately the maximum along the crack extension line. The direction of initial crack extension in a mixed mode can be predicted through an elastic finite element analysis and using the criterion of maximum tangential principal stress. The study also indicates that the load-displacement diagram associated with a mixed mode stable crack growth can be predicted reasonably accurately using the criterion of crack opening angle.

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Initial Experimental Investigation of Tearing Instability Theory

Cited by 39 publications

References 0 publications

Strain hardening and stable tearing effects in fitness-for-service assessment :

Strain hardening and stable tearing effects in fitness-for-service assessment :

An Experimental Evaluation of Tearing Instability Using the Compact Specimen

Experimental and finite element study on stable crack growth in three point bending

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