Short-pulse fracture mechanics

Shockey, D. A.; Erlich, D. C.; Kalthoff, J. F.; Homma, Hiroomi

doi:10.1016/0013-7944(86)90195-5

Cited by 36 publications

(25 citation statements)

References 7 publications

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“…Results of short pulse experiments reported in [153][154][155][156][157] have lead to the conclusion that for short crack lengths the stress amplitude o-0 for crack instability decreases with increasing crack length, which is in agreement with quasi-static formulation, i.e. (9.3) This occurs for relatively long pulses.…”

Section: Pulse Loading Of An Isolated Crocksupporting

confidence: 67%

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Crack Dynamics in Metallic Materials

Klepaczko¹

1990

CISM International Centre for Mechanical Sciences

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Le spese di stampa di questo volwne sono in parte coperte da contributi del Consiglio N azionale delle Ricerche. This volwne contains 286 illustrations.This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. ISBN 978-3-211-82226-5 ISBN 978-3-7091-2824-4 (eBook) DOI 10.1007/978-3-7091-2824 © 1990 by Springer-Verlag Wien Originally published by CISM, Udine in 1990. Springer-Verlag WienIn order to make this volwne available as economically and as rapidly as possible the authors' typescripts have been reproduced in their original forms. This method unfortunately has its typographical limitations but it is hoped that they in no way distract the reader. Dynamic (inertia and strain rate) effects influence crack growth processess if the applied loading rate is sufficiently high or if the crack tip moves with a speed that is a significant fraction of the wave velocities. In the paper basic results as well as solutions to boundary value problems incorporating dynamic effects are discussed. The integral expression for the energy flow to a moving crack tip is derived and related path-area integrals are discussed. It is shown that these quantities are non-trivial only if the energy density behaves as O(rlll). The ]-integral emerges as a special case of the general formulations. For linear dynamic problems a line integral defined in the Laplace transform space is introduced. The asymptotic field of a crack growing dynamically in a linear elastic material is derived and the stress-intensity factors are defined. K 1 -solutions are discussed for a number of problems involving both stationary cracks under dynamic loading as well as moving tips. Asymptotic solutions are given for both stationary and moving tips in different non-linear materials with either rate-independent or rate-dependent elasto-plastic behaviour. These solutions provide the basis for a discussion of dynamic crack growth criteria. Finally, some aspects on numerical modelling of dynamic crack problems are briefly discussed. PREFACE

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Section: Pulse Loading Of An Isolated Crocksupporting

confidence: 67%

“…9.3. This type of experiment was first pursued by Shockey et al [153,154] and later by Buchar [156]. Both schemes of loading are shown in Fig.…”

Section: Pulse Loading Of An Isolated Crockmentioning

confidence: 98%

Crack Dynamics in Metallic Materials

Klepaczko¹

1990

CISM International Centre for Mechanical Sciences

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“…However, this maximum stress intensity criterion was not able to explain the experimental results having short-pulse loads performed by Shockey and Curran (1973) and Shockey et al (1986). Though evaluated as unstable under dynamic loads based on maximum stress intensity criterion, cracks above a certain crack size propagated but small ones remained stable.…”

Section: Introductionmentioning

confidence: 54%

“…Kalthoff and Shockey (1977) explained these results by analyzing the early time stress intensity histories experienced by cracks of different lengths under stress pulses of different durations and proposed that, "for instability to occur, the dynamic stress intensity factor must exceed the fracture toughness for a certain minimum time (called as minimum time criterion)". With this criterion, Shockey et al (1986) interpreted the experimental data for various materials including epoxy, aluminum, and steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of loading rate on dynamic fracture initiation toughness of brittle materials

Kim

Chao

2007

Int J Fract

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Numerical simulation is carried out to investigate the effect of loading rate on dynamic fracture initiation toughness including the crack-tip constraint. Finite element analyses are performed for a single edge cracked plate whose crack surface is subjected to uniform pressure with various loading rate. The first three terms in the Williams' asymptotic series solution is utilized to characterize the crack-tip stress field under dynamic loads. The coefficient of the third term in Williams' solution, A 3 , was utilized as a crack tip constraint parameter. Numerical results demonstrate that (a) the dynamic crack tip opening stress field is well represented by the three term solution at various loading rate, (b) the loading rate can be reflected by the constraint, and (c) the constraint A 3 decreases with increasing loading rate. To predict the dynamic fracture initiation toughness, a failure criterion based on the attainment of a critical opening stress at a critical distance ahead of the crack tip is assumed. Using this failure criterion with the constraint parameter, A 3 , fracture initiation toughness is determined and in agreement with available experimental data for Homalite-100 material at various loading rate.

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“…In the second case, when the fracture is excited by short load pulses with time shapes close to the delta function, threshold amplitude, K d I is usually significantly less than K I C (ex. Atroshenko et al 2002;Shokey et al 1986). This reasoning shows that the dynamic fracture toughness, K d I , is not an intrinsic characteristic of a material and that usage of critical stress intensity factor criterion (K I (t) ≥ K d I ) to describe dynamic fracture initiation cannot be universally correct.…”

Section: Discussionmentioning

confidence: 97%

Application of incubation time approach to simulate dynamic crack propagation

Bratov

Petrov

2007

Int J Fract

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The incubation time criterion for dynamic fracture is applied to simulate dynamic crack propagation. Being incorporated into ANSYS finite element package, this criterion is used to simulate the classical dynamic fracture experiments of Ravi-Chandar and Knauss on dynamic crack propagation in Homalite-100. In these experiments a plate with a cut simulating the crack was loaded by an intense pressure pulse applied on the faces of the cut. The load consisted of two consequent trapezoidal pulses. This, in the experimental conditions used by Ravi-Chandar and Knauss, resulted in a crack initiation, propagation, arrest and reinitiation. Dependence of the crack length on time was measured in those experiments. The results for crack propagation obtained by FEM modelling are in agreement with experimental measurements of crack length histories. This result shows the applicability of the incubation time approach to describe the initiation, propagation and arrest of dynamically loaded cracks.

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Short-pulse fracture mechanics

Cited by 36 publications

References 7 publications

Crack Dynamics in Metallic Materials

Crack Dynamics in Metallic Materials

Effect of loading rate on dynamic fracture initiation toughness of brittle materials

Application of incubation time approach to simulate dynamic crack propagation

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