Size-dependent fracture behavior of Guiting limestone under mixed mode loading

The use of cement concrete as a stronger and more durable material than asphalt concrete in construction of the pavements has been increased during the past decades. This review paper investigates the effect of various input variables for the design of continuously reinforced concrete pavements. A literature review is prepared based on the efforts performed by many researchers to investigate the effect of different factors including temperature change, shrinkage, material properties of the concrete, and concrete slab/ subbase bond properties on the displacements and stresses in the concrete slab. It is found that the important role of concrete slab/ subbase bond strength has not been investigated properly as compared to other input variables.

Section: Fracture Criteria For Bonded Structuresmentioning

confidence: 99%

Factors influencing stresses and movements in continuously reinforced concrete pavements – A review

Mirsayar¹,

Zollinger²

2018

“…Many criteria are used to understand the fracture behavior of materials under mixed mode I/II loading conditions such as maximum tangential stress (Erdogan & Shi, 1963), minimum strain energy density (Sih & Macdonald, 1974), maximum energy release rate (Hussain, 1974;Nuismer, 1975) and maximum tangential strain (Chang, 1981). Numerous experimental and numerical analyses were performed and various types of specimens (Arcan et al, 1978;Richard & Benitz, 1983;Mirsayar, 2014;Akbardoost, 2014;Akbardoost et al, 2014;Abd-Elhady, 2013;Aliha et al, 2015aAliha et al, , b, 2016a were introduced by researchers and used in experimental analyses. Stress intensity factor, SIF, for crack surfaces under opening mode in a linearelastic solid can be determined by extrapolations-based methods or energy-based methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of mixed mode I/II stress intensity factors of edge slant cracked plates

Fayed¹

2017

Mixed mode I/II stress intensity factors of an edge slant-cracked plate under tensile loading were assessed. A two-dimensional finite element analysis was employed using ABAQUS. Various crack lengths and angles were analyzed. The effect of the crack location at the plate edge was also examined. Crack initiation angles were calculated. In general, modes I and II stress intensity factor increase with increasing crack length. However, the rate of increase in mode I SIF decreases with increasing the main crack angle. The results showed that stress intensity factors decreased ad the crack mouth approaches the edge mid line. The crack location becomes more significant as the crack length increases. The angle of first cracking depends on crack length, location, and angle.

“…Several test specimens and fracture models have been used in the past for investigating the mixed mode tensile-shear fracture behaviour of brittle materials (e.g. Akbardoost et al, 2014;, 2014Ayatollahi & Aliha, 2009;Aliha et al, 2012;Ayatollahi et al, 2011b). One of the most important theories in the context of brittle fracture of engineering components is certainly the strain energy density (SED) criterion.…”

Section: Introductionmentioning

confidence: 99%

Review of local strain energy density theory for the fracture assessment of V-notches under mixed mode loading

Ayatollahi¹,

Berto²,

Campagnolo³

et al. 2017

The present work summarizes some recent experimental, theoretical and numerical results on brittle fracture of isostatic polycrystalline graphite. The analyses have been carried out on Vnotched samples under mixed mode (I+II), torsion and compression loading, considering various combinations of the notch tip radius, opening angle and notch tilt angle. The static strength of the considered specimens is assessed through an approach based on the strain energy density averaged over a control volume. The center of the control volume is located on the notch edge, where the principal stress reaches its maximum value. The correct orientation is obtained by a rigid rotation of the crescent-shaped volume while the size depends on the fracture toughness and the ultimate strength of the material. This methodology has been already used in the literature to analyze U-and V-shaped notches subject to mode I loading with very good results and advantages with respect to classic approaches. The results reported in this new work show, also under mixed mode loading conditions, good agreement between experimental data and theoretical predictions.