Engineering Fracture Mechanics

article

An experimental and computational investigation of crack growth initiation in three-point bend fracture specimens

V. G. Degiorgi, P. Matic

Engineering Fracture Mechanics > 1995 > 50 > 1 > 1-9

An experimental and computational study of HY-100 steel three-point bend fracture specimens was performed. Two specimens were considered in the experimental portion of the study, differing with respect to thickness and the presence of side grooves. Plane stress and plane strain finite element analyses of the specimens were conducted to assess the relative role of constraint on load vs crack opening...

article

Fundamental formulas of dynamic stress intensity factors of mode III for a propagating crack in a strip

Huang Bo

Engineering Fracture Mechanics > 1995 > 50 > 1 > 61-64

Using a new single complex function, this paper gives a general solution for a semi-infinite moving crack in a strip, supposing that the surfaces of the crack are subjected to an arbitrary self-equilibrium distributed anti-plane shear stress and other boundaries are clamped. This solution can reduce to a static solution.

article

The high strain fatigue behavior of lead-containing copper alloys

T. S. Srivatsan

Engineering Fracture Mechanics > 1995 > 50 > 1 > 85-101

In this paper, the influence of alloy composition on microstructure, cyclic stress response, cyclic strain resistance, low-cycle fatigue life and cyclic fracture behavior of lead-containing copper alloys is presented. Alloy composition, that is, lead content, was observed to have an influence on the size and distribution of lead globules in the copper matrix. Lead content was found to have a profound...

article

Fracture mechanics of the angled elliptic crack under uniaxial tension

Hsien-Yang Yeh

Engineering Fracture Mechanics > 1995 > 50 > 1 > 103-110

The behavior of the polymethylmethacrylate (PMMA) plate with an elliptic crack under uniaxial tensile stress is investigated. The direction of fracture propagation and the critical stress which causes the fracture initiation are predicted and compared with experimental data available in the literature. The Yeh-Stratton criterion is applied to the said problem in the form of the maximum principal...

article

Crack propagation in prestressed plates

M. Farshad, P. Flüeler

Engineering Fracture Mechanics > 1995 > 50 > 1 > 41-50

In this paper, a theoretical study of steady state crack propagation in thin elastic prestressed plates is carried out. For this purpose, a second-order theory of initially stressed plates in the plane stress mode is used; this theory incorporates the second-order effects arising from the local rotations. The dynamic stress field in the vicinity of crack tip is analytically determined. The analytical...

article

An algorithm and a computer program for the three-term asymptotic expansion of elastic-plastic crack tip stress and displacement fields

G. P. Nikishkov

Engineering Fracture Mechanics > 1995 > 50 > 1 > 65-83

Study of stress and displacement fields in the microstructurally significant region near the tip of a crack in an elastic-plastic body is important for establishing multi-parameter fracture criteria. A mathematical tool for such study is a multi-term asymptotic expansion of crack tip fields. This paper presents a methodology and a FORTRAN program for the determination of three-term asymptotic stress...

article

Boundary element analysis of thermally stressed interface cracks

D. Katsareas, N. Anifantis

Engineering Fracture Mechanics > 1995 > 50 > 1 > 51-60

Steady-state thermal stress intensity factors in infinite two-dimensional interfacially cracked bimaterials are evaluated using the boundary element method. The singular behavior of temperature and displacement fields in the vicinity of the crack tip is modelled through special crack tip elements, while the transformation of domain integrals to equivalent boundary integrals, combined with the multi-domain...

article

Frictional contact of an arc crack in an isotropic homogeneous material due to uniaxial loading

Ru-Min Chao, Ming-Ying Rau

Engineering Fracture Mechanics > 1995 > 50 > 1 > 121-130

In this paper we continue the work of Chao and Laws [Q. Jl Mech. appl. Math. 45(4), 629-640 (1992)] and study the partial contact problem of an arc crack in an infinite isotropic elastic solid under uniaxial loading at infinity. We extend the analysis to include the effect of friction on the crack surfaces and consider the contact crack surfaces in slip and no-slip contact conditions. Formulation...

article

Damage mechanics models for brittle microcracking solids based on three-dimensional mesoscopic simulations

Yutaka Toi, Takanori Kiyosue

Engineering Fracture Mechanics > 1995 > 50 > 1 > 11-27

Fracture behaviors of brittle polycrystalline solids such as ceramic materials are deeply related to microcracking. Continuum damage mechanics is considered a powerful theoretical framework to deal with brittle microcracking solids. However, it is fairly difficult to obtain analytically, as well as experimentally, evolution equations for microcracking and reduced elastic compliances of microcracked...

article

The asymptotic study of fatigue crack growth based on damage mechanics

Zhao Jun, Zhang Xing

Engineering Fracture Mechanics > 1995 > 50 > 1 > 131-141

In order to evaluate the mechanical behaviour around a growing fatigue crack tip for plane stress of mode I, the asymptotic governing equations and their boundary conditions are formulated by the light of damage mechanics. A series of examples are studied numerically to obtain the orders of stress, strain and damage, the distributions of the stress and damage field, and the contour of the process...

article

On the formation of near-tip microcracking and associated toughening effects

S. X. Gong

Engineering Fracture Mechanics > 1995 > 50 > 1 > 29-39

Based upon the concept of microcrack precursor nucleation, a micromechanics model is proposed to study the formation of near-tip microcracking and consequent toughening effects. Analytical expressions are derived for the microcrack density distribution and the size and shape of the microcracking zone. The concept of a saturated inner zone with constant microcrack density follows as a natural consequence...

article

Process zone fracture criteria for crack tips

D. Radaj, S. Zhang

Engineering Fracture Mechanics > 1995 > 50 > 1 > 111-120

The further development of the local stress, strain or energy density criteria is considered necessary in respect of the crack initiation in a process zone outside the original crack or slit tip. Specific criteria are proposed for brittle and ductile crack initiation. The relevant limit value formulae are developed and the results shown for superimposed K _I - and K _I _I -loading...

article

Dependence of the fatigue limit of rail steels on stress intensity factor near inclusions

C. D. Liu, M. N. Bassim, S. St. Lawrence

Engineering Fracture Mechanics > 1995 > 50 > 2 > 301-307

The fatigue limits of four rail steels were evaluated with multiple specimens under bending. Inclusion volume and average size were quantitatively measured using an image analyzer in an attempt to correlate these parameters with the fatigue limit. However, no direct relationship was found between the fatigue limits and the elongated inclusion content and average size. Hence, the stress intensity...

article

Fractal characterization of some fracture phenomena

Weisheng Lei, Bingsen Chen

Engineering Fracture Mechanics > 1995 > 50 > 2 > 149-155

Fractal descriptions of critical crack extension force, crack branching and crack propagation speed were proposed in this investigation to show the incompatibility of linear fracture mechanics with fractal dimensionality.

article

Investigation of main-micro crack interaction problems in a unidirectional fibre reinforced composite

Yi-Heng Chen, Norio Hasebe

Engineering Fracture Mechanics > 1995 > 50 > 2 > 283-293

The elastic interaction between a main crack and an inclined micro crack in a unidirectional fibre reinforced composite is studied. The Fredholm integral method and the pseudo-traction method proposed in isotropic cases are extended to treat the main-micro crack problems in orthotropic cases. The influence of orthotropic material constants on the interaction effect, i.e. the amplification effect...

article

Investigation of EEF properties for a crack in a plane orthotropic elastic solid with purely imaginary characteristic roots

Yi-Heng Chen, Norio Hasebe

Engineering Fracture Mechanics > 1995 > 50 > 2 > 249-259

The properties of the eigenfunction expansion form for a semi-infinite crack in a plane orthotropic elastic body with purely imaginary characteristic roots are studied in detail. The difficulties in performing Bueckner's integral with two complex arguments are overcome and the expected explicit function representations for the integral are derived. It is found that the pseudo-orthogonal property...

article

Fracture initiation outside the slit tip

D. Radaj, S. Zhang

Engineering Fracture Mechanics > 1995 > 50 > 2 > 309-310

Fracture initiation outside the slit tip is predicted using the Erdogan-Sih tangential stress criterion in the case of the double strip model subjected to counter-bending moments, whereas the Neuber hypothesis fails in the considered case.

article

An EPFM analysis of crack initiation, stable growth and instability

G. S. Wang

Engineering Fracture Mechanics > 1995 > 50 > 2 > 261-282

An elastic-plastic fracture mechanics (EPFM) procedure has been developed to analyse the crack initiation, stable growth and instability in the plane stress condition. The procedure is based on the Dugdale-Barenblatt strip yield model, but modified for the strain hardening and stable crack growth under monotonic loading. The crack opening angle (CTOA) is used as the crack growth criterion in the...

article

An analytical study of J-integral estimation formula for a straight-through cracked three-point bend round beam specimen

Wang Qizhi

Engineering Fracture Mechanics > 1995 > 50 > 2 > 143-148

In this paper, the elastic deflection formula for a straight-through cracked three-point bend round beam is derived using an analytical method. If the crack tip plastic zone or fracture process zone is localized near the crack, its effect on the load line deflection can be considered through proper modification of the crack length in the elastic deflection formula, a functional form of the plastic...

article

A method for fracture toughness testing cylinder material

J. T. Evans, G. Kotsikos, R. F. Robey

Engineering Fracture Mechanics > 1995 > 50 > 2 > 295-300

A method of testing cylinder wall material based on the compact tension specimen design is described. The test requires the manufacture of a special loading fixture which can be used in a conventional testing machine. The test differs from the test using the well-known C-shape specimen because fracture propagating in the direction of the cylinder axis is simulated in the new test. With this geometry...

INFONA - science communication portal

Engineering Fracture Mechanics

An experimental and computational investigation of crack growth initiation in three-point bend fracture specimens

Fundamental formulas of dynamic stress intensity factors of mode III for a propagating crack in a strip

The high strain fatigue behavior of lead-containing copper alloys

Fracture mechanics of the angled elliptic crack under uniaxial tension

Crack propagation in prestressed plates

An algorithm and a computer program for the three-term asymptotic expansion of elastic-plastic crack tip stress and displacement fields

Boundary element analysis of thermally stressed interface cracks

Frictional contact of an arc crack in an isotropic homogeneous material due to uniaxial loading

Damage mechanics models for brittle microcracking solids based on three-dimensional mesoscopic simulations

The asymptotic study of fatigue crack growth based on damage mechanics

On the formation of near-tip microcracking and associated toughening effects

Process zone fracture criteria for crack tips

Dependence of the fatigue limit of rail steels on stress intensity factor near inclusions

Fractal characterization of some fracture phenomena

Investigation of main-micro crack interaction problems in a unidirectional fibre reinforced composite

Investigation of EEF properties for a crack in a plane orthotropic elastic solid with purely imaginary characteristic roots

Fracture initiation outside the slit tip

An EPFM analysis of crack initiation, stable growth and instability

An analytical study of J-integral estimation formula for a straight-through cracked three-point bend round beam specimen

A method for fracture toughness testing cylinder material

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