Relevant bibliographies by topics / Crack Propagation Path

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Crack Propagation Path'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Crack Propagation Path"

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Lewicki, D. G., and R. Ballarini. "Effect of Rim Thickness on Gear Crack Propagation Path." Journal of Mechanical Design 119, no. 1 (1997): 88–95. http://dx.doi.org/10.1115/1.2828793.

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Analytical and experimental studies were performed to investigate the effect of rim thickness on gear tooth crack propagation. The goal was to determine whether cracks grew through gear teeth or through gear rims for various rim thicknesses. A finite element based computer program (FRANC, FRacture ANalysis Code) simulated gear tooth crack propagation. The analysis used principles of linear elastic fracture mechanics. Quarter-point, triangular elements were used at the crack tip to represent the stress singularity. The program had an automated crack propagation option in which cracks were grown numerically using an automated re-meshing scheme. Crack tip stress intensity factors were estimated to determine crack propagation direction. Gears with various backup ratios (rim thickness divided by tooth height) were tested to validate crack path predictions. Gear bending fatigue tests were performed in a spur gear fatigue rig. From both predictions and tests, gears with backup ratios of 3.3 and 1.0 produced tooth fractures while a backup ratio of 0.3 produced rim fractures. For a backup ratio of 0.5, the experiments produced rim fractures and the predictions produced both rim and tooth fractures, depending on the initial geometry of the crack.
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Chao, Xu, and Shang Lei Yang. "Analysis on Fatigue Crack Propagation and Fractography of A7075 Aluminum Alloy." Applied Mechanics and Materials 217-219 (November 2012): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.390.

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The fatigue fractography and surface of A7075 aluminum alloy was investigated by means of optical microscope, scanning electron microscope and technology of metallurgic replica. The results show that the fatigue crack generally initiated in the surface or near the surface of the sample area, such as hole and inclusion. The crack propagation regions under high stress amplitude was characterized by furrow and hollow, and obviously presented fine ripple vein. While lots of fatigue striations and sidesteps with the holes and secondary cracks generated in the crack propagation regions of low stress amplitude. Fatigue transient breaking area is a mixed fracture of brittle and ductile fracture. In the fatigue crack propagation stage, with the increasing of cycle times, secondary cracks gradually merged into primary crack on the path of crack propagation. The dislocation of crack tip,grain boundaries and different grain orientations have great influence on the path of crack growth, which can make cracks bending.
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Hosseini-Toudeshky, Hossein, Bijan Mohammadi, and Pooya Saniei. "Fatigue Multi-Cracks Growths in Plates Using J-Integral Approach with a Developed Home FEM Software." Key Engineering Materials 560 (July 2013): 61–70. http://dx.doi.org/10.4028/www.scientific.net/kem.560.61.

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In this paper multiple fatigue cracks propagation are simulated in two-dimensional plates. Since re-meshing the cracked bodies in each increment of crack extension is a time-consuming and complicated procedure, numerical simulation of mixed-mode crack propagation with FEM is a difficulty. For this purpose, a FEM software is programmed and mesh refinement in each increment of crack is performed by Delaunay Refinement Algorithm. Using different refinement methods, complex boundaries such as multiple cracks and discontinuities which are closed together are easily refined by this algorithm. Crack propagation path is predicted using domain form of J-integral. Modified tensile stress (MTS) criterion is used to predict the crack propagation path in each increment. Different numerical examples illustrate the validation and reliability of present software.
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Zhu, Chang Shun, Guo Lin Wang, Ping Ping Li, and Shang Wei Chen. "Crack-Propagating Direction of Tire Bead Rubber Determined by Jmax Criterion." Applied Mechanics and Materials 43 (December 2010): 628–32. http://dx.doi.org/10.4028/www.scientific.net/amm.43.628.

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Three-dimensional crack propagating path of tire bead rubber was the premise to study the crack propagation direction of bead. For this reason, Jmax Criterion was put forward. Utilized J integral maximum (Jmax) to determine the crack propagation direction of rubber. Calculated J-integral values of different preset directions by Abaqus built-in algorithm, obtained J (θ) curve which showed the Jmax and direction angle (θ) by fitting simulation data. Using Abaqus to set up two different crack model of bead rubber and simulate the crack propagation path, the results was consistent with the real crack propagation direction of specimen test, validated the applicability of Jmax Criterion..
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Wei, Rongbing, Renbing Wu, and Kun Zhou. "Fatigue crack propagation in heterogeneous materials under remote cyclic loading." Journal of Micromechanics and Molecular Physics 01, no. 01 (2016): 1650003. http://dx.doi.org/10.1142/s242491301650003x.

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A fatigue model for the analysis of crack propagation in heterogeneous materials is developed. The crack propagation is driven by cyclic loading and affected by the presence of neighboring inclusions which can have initial eigenstrains such as thermal strain and misfit strain. The static Semi-analytic solution obtained by Zhou et al. [2011a] is utilized to obtain the full stress filed and the stress intensity factors. In order to simulate the crack propagation in heterogeneous materials, the maximum hoop stress criterion is applied to predict crack propagation directions and the Paris-type law is employed to analyze the crack fatigue. Meanwhile, a zigzag crack path consisting of many small vertical and horizontal cracks models an arbitrary crack propagation path. The results show that material dissimilarity between the inclusion and matrix and the magnitude of cyclic loading could greatly influence the behaviors of crack propagation.
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Liu, Bang, Zheming Zhu, Ruifeng Liu, Lei Zhou, and Duanying Wan. "Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens." Shock and Vibration 2019 (May 20, 2019): 1–13. http://dx.doi.org/10.1155/2019/2308218.

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Radial cracks may exist around tunnel edge, and these cracks may propagate and weaken tunnel stability under nearby blasting operations. In order to study the blast-induced fracture behavior of radial cracks emanating from a tunnel spandrel, a tunnel model containing a spandrel crack (TMCSC) with different inclination angles was proposed in this paper. Crack propagation gauges (CPGs) and strain gauges were used in the experiments to measure crack initiation moment and propagation time. Finite difference models were established by using AUTODYN code to simulate crack propagation behavior and propagation path. ABAQUS code was used to calculate dynamic stress intensity factors (SIFs). The results show that (1) crack inclination angles affect crack initiation angles and crack propagation lengths significantly; (2) critical SIFs of both mode I and mode II decrease gradually with the increase of the crack propagation speed; (3) the dynamic energy release rates vary during crack propagation; and (4) there are “crack arrest points” on the crack propagation paths in which the crack propagation speed is very small.
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Sadeghipour, Keyanoush, George Baran, Hanqing Zhang, and Wei Wu. "Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers." Journal of Engineering Materials and Technology 125, no. 2 (2003): 97–106. http://dx.doi.org/10.1115/1.1543967.

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The propagation of a crack initiating at the surface was analyzed to simulate the fatigue wear behavior of glassy polymer materials. A crack in a material half plane was assumed to propagate along a predefined path as a result of contact loading by a cylinder sliding on the polymer surface. The crack path consisted of a vertical straight-line segment and a declined straight line originating at a branch point on the vertical crack segment. The stress intensity factors KI and KII along the crack path were computed by using finite element methods, and their values utilized in the Paris law to determine crack propagation rates. Because this process simulates surface pitting, component fatigue life is assumed to be proportional to the time needed for the propagating declined crack to intersect a neighboring vertical crack, a condition known to lead to pitting. This fatigue life is estimated by integrating the Paris law. Numerical results show that the branch point where the declined crack path originates can effectively hinder crack propagation, and that the rate limiting step in fatigue is crack propagation along a small segment of the declined crack near the branch point. Some important factors that affect the reliability of numerically predicted fatigue life cycles are discussed. Experimental crack propagation paths and lifetimes are shown.
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Aoki, Y., T. Matsuyama, Yasuji Oda, Kenji Higashida, and Hiroshi Noguchi. "Effects of Hydrogen Gas Environment on Non-Propagation Phenomena of a Type 304 Austenitic Stainless Steel." Key Engineering Materials 297-300 (November 2005): 927–32. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.927.

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In order to investigate the hydrogen gas effect on non-propagation phenomena of a type 304 austenitic stainless steel, fatigue tests with in-situ observation using a Scanning Laser Microscope were performed in air, in 0.18MPa hydrogen gas and in 0.18MPa nitrogen gas. A nonpropagating crack was observed during the fatigue test in air. At almost the same stress level of non-propagating in air, non-propagating cracks were also observed in fatigue tests in hydrogen and in nitrogen. Stress level of the non-propagation is not sufficiently different in the three environments. However, the process up to non-propagation differs from each other, for example, the crack path and debris.
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Sakane, Masao, Kazuhiro Itoh, Yutaka Tsukada, and Kenji Terada. "Crack Propagation Behavior at Sn37Pb-Copper Interface in Low Cycle Fatigue." Key Engineering Materials 353-358 (September 2007): 2962–65. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2962.

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This paper studies the crack propagation at Sn37Pb-copper interface in push-pull low cycle fatigue. Bonded specimens of Sn37Pb and copper having notch holes with different distances from the interface were fatigued at 313K and the crack propagation paths were observed. Cracks propagated at the interface when the notch hole was near the interface but propagated in the solder when the notch hole was away from the interface. The propagation rate of the interfacial crack was faster than that of non-interface crack. The crack path and crack propagation rate of the two types of cracks were discussed in relation to J integral range calculated by finite element method.
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Kim, Hyo Jin, Sang Ho Lee, and Moon Kyum Kim. "Prediction of Crack Propagation under Dynamic Loading Conditions by Using the Enhanced Point Collocation Meshfree Method." Key Engineering Materials 324-325 (November 2006): 1059–62. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1059.

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An efficient and accurate numerical program with enhanced point collocation meshfree method is developed to simulate crack propagation under dynamic loading conditions. The enhanced meshfree method with point collocation formulation and derivative approximation in solids is presented. This study also presents the crack propagation criterion and computation of propagating direction, and the total structure of the numerical program named PCMDYC(Point Collocation Meshfree method for DYnamic Crack propagation). Several examples of crack propagation under dynamic loads are analyzed to simulate the arbitrary crack propagation under dynamic loads. The results show that PCMDYC predicts the propagating path of crack under dynamic loading conditions accurately and robustly.
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Dissertations / Theses on the topic "Crack Propagation Path"

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田中, 啓介, Keisuke TANAKA, 義明 秋庭 та ін. "繰返しねじり・引張複合荷重下での予き裂からの疲労き裂進展経路の予測". 日本機械学会, 2005. http://hdl.handle.net/2237/9131.

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來海, 博央, Hirohisa KIMACHI, 拓. 田中 та ін. "長繊維強化プラスチックスにおける巨視的モードⅠ負荷を受ける層間き裂の進展経路". 日本機械学会, 2000. http://hdl.handle.net/2237/9168.

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Hejman, Ulf. "On initiation of chemically assisted crack growth and crack propagation paths of branching cracks in polycarbonate." Licentiate thesis, Malmö högskola, Teknik och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-7790.

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Stress corrosion, SC, in some cases gives rise to stress corrosion cracking, SCC, which differs from purely stress intensity driven cracks in many aspects. They initiate and grow under the influence of an aggressive environment in a stressed substrate. They grow at low load and may branch. The phenomenon of SCC is very complex, both the initiation phase and crack extension itself of SCC is seemingly associated with arbitrariness due to the many unknown factors controlling the process. Such factors could be concentration of species in the environment, stress, stress concentration, electrical conditions, mass transport, and so on.In the present thesis, chemically assisted crack initiation and growth is studied with special focus on the initiation and branching of cracks. Polycarbonate plates are used as substrates subjected to an acetone environment. Experimental procedures for examining initiation and branching in polycarbonate are presented. An optical microscope is employed to study the substrate.The attack at initiation is quantified from pits found on the surface, and pits that act as origin for cracks is identified and the distribution is analysed. A growth criterion for surface cracks is formulated from the observations, and it is used to numerically simulate crack growth. The cracks are seen to coalesce, and this phenomenon is studied in detail. Branching sites of cracks growing in the bulk of polycarbonate are inspected at the sample surface. It is found that the total width of the crack branches are approximately the same as the width of the original crack. Also, angles of the branches are studied. Further, for comparison the crack growth in the bulk is simulated using a moving boundary problem based algorithm and similar behaviour of crack branching is found.
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Berge-Gras, Rébécca. "Analyse expérimentale de la propagation de fissures dans des tôles minces en al-li par méthodes de champs." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00716429.

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Ce travail porte sur des essais de traction réalisés sur des éprouvettes d'aluminium lithium entaillées, avec des observations in-situ du champ de déformations.La réduction de consommation de carburant est actuellement une priorité pour l'aviation. Les alliages d' Al-Li sont d'excellents candidats pour réduire le poids des avions puisqu'ils combinent de très bonnes propriétés mécaniques avec une densité inférieure à celle des alliages conventionnels. Cependant, les propriétés mécaniques de ces matériaux sont fortement anisotropes, et il est essentiel de contrôler ce phénomène afin d'utiliser le matériel à bon escient. À cette fin, il est nécessaire d'avoir le maximum d'informations sur le matériau tant sur ses propriétés microstructurales (taille et forme des grains...) que mécaniques (élasticité, module de Young, résistance à la fissuration ...). Mais la connaissance de ces propriétés mécaniques globales n'est pas suffisante pour maximiser la résistance à la fissuration (critique dans l'application aéronautique). Dans ce contexte, ce travail vise à quantifier l'influence de la microstructure locale (orientation et la taille des grains) sur la fissuration.La propagation des fissures dans des tôles d'épaisseur 2 mm a été analysée. Les essais de traction ont été effectués sur des échantillons entaillés avec observation in-situ du champ de déplacement.Ainsi, la méthode de la grille a été adaptée pour déterminer de grandes déformations dans les grains. Le champ de déplacement a été caractérisée par la déformation d'une grille croisée collée (pas 30 um), et les paramètres affectant la qualité des résultats (résolution et résolution spatiale) ont été optimisés. Afin de compenser le mouvement du corps rigide, un nouveau système automatique d'acquisition d'image conduisant à de petites déformations entre chaque image a été développé. Une nouvelle méthode d'extraction de phase a été instauré, permettant un déroulage temporel de la phase.
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Ke, Chien-Chung, and 柯建仲. "Crack Propagation Path Modeling of Anisotropic Rocks Using the Boundary Element Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/85834637292043052498.

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博士<br>國立成功大學<br>資源工程學系碩博士班<br>95<br>Rock masses in nature contain numerous discontinuities as cracks, joints, cleavages, beddings and even faults etc. Deformation and failure of a rock mass is largely dependent on the presence of geological discontinuities such as cracks and faults. In the cracked material, the stress intensity factors (SIFs) at crack tips, which govern the crack propagation and are associated with the strength of the materials, are strongly affected by crack inclination angle, orientation of anisotropy. This study presents the development of a unified numerical framework based on the boundary element method (BEM) for modeling crack propagation behavior in anisotropic rocks. In this study, a new formulation of the BEM, based on the relative displacements at the crack tip, is used to determine the mixed mode SIFs of isotropic and anisotropic rocks. The new BEM formulation is such that the displacement integral equation is only collocated on the outside boundary and the traction integral equation is only collocated on one side of the crack surface. A decoupling technique can be used to determine the mixed mode SIFs of isotropic and anisotropic rocks based on the relative displacements at the crack tip. Numerical examples for the determination of the mixed mode SIFs for anisotropic rocks with different crack inclination angle, crack length, and degree of material anisotropy are presented. A systematic procedure for determining fracture toughness of an anisotropic marble using the diametral compressive test (Brazilian test) with a central crack on the discs is presented. Additionally, a novel formulation to increase the accuracy in Stress Intensity Factor (SIF) calculations using Boundary Element Method (BEM) is applied to determine the stress intensity factors and the fracture toughness of anisotropic rocks under mixed-mode loading. The marble with clear white-black foliation from Hualien (in eastern Taiwan), was selected for the Brazilian tests. Diametral loading was conducted on the Cracked Straight Through Brazilian Disc (CSTBD) specimens to evaluate their fracture toughness. In addition, a new fracture criterion was developed to predict pure mode I, pure mode II or mixed mode I-II fracture toughness of the anisotropic marble. The new fracture criterion of anisotropic marble is based on the examination of mode I, mode II and mixed mode I-II fracture toughness for different crack angles and anisotropic orientation. In this study, the BEM formulation combined with the maximum circumferential stress criterion was used to predict the crack initiation angles and to simulate the crack propagation paths. To demonstrate the proposed BEM procedure to predict crack propagation in anisotropic rocks, the propagation path in CSTBD specimen was numerically predicted and compared with the actual laboratory observations. Good agreement is found between the two approaches. It is therefore concluded that the proposed BEM procedure can accurately simulate the process of crack propagation for anisotropic rocks. This study also presents a fracture propagation analysis for simulating the process of slope failure. Unlike the conventional slope stability analysis, the failure mode or the failure plane does not need to pre-defined. The development of the simulating failure surface is subjected to the fracture propagation under mixed mode constraints.
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Books on the topic "Crack Propagation Path"

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Lewicki, David G. Effect of rim thickness on gear crack propagation path. National Aeronautics and Space Administration, 1996.

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Lewicki, David G. Effect of rim thickness on gear crack propagation path. National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Crack Propagation Path"

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Dally, Tim, Carola Bilgen, Marek Werner, and Kerstin Weinberg. "Cohesive Elements or Phase-Field Fracture: Which Method Is Better for Dynamic Fracture Analyses?" In Modeling and Simulation in Engineering - Selected Problems. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92180.

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Numerical techniques to simulate crack propagation can roughly be divided into sharp and diffuse interface methods. Two prominent approaches to quantitative dynamic fracture analysis are compared here. Specifically, an adaptive cohesive element technique and a phase-field fracture approach are applied to simulate Hopkinson bar experiments on the fracture toughness of high-performance concrete. The experimental results are validated numerically in the sense of an inverse analysis. Both methods allow predictive numerical simulations of crack growth with an a priori unknown path and determine the related material parameter in a quantitative manner. Reliability, precision, and numerical costs differ however.
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"Critical combination of tensile and shear stresses causing the crack propagation path in brittle clays subjected to uniaxial compression." In Advances in Unsaturated Soils. CRC Press, 2013. http://dx.doi.org/10.1201/b14393-57.

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Sheibani, Farrokh, and Jon Olso. "Stress Intensity Factor Determination for Three-Dimensional Crack Using the Displacement Discontinuity Method with Applications to Hydraulic Fracture Height Growth and Non- Planar Propagation Paths." In Effective and Sustainable Hydraulic Fracturing. InTech, 2013. http://dx.doi.org/10.5772/56308.

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"predicting the permissible external loading that a diamond-coated cutting tool can withstand without premature de-bonding. 3.1.6. Wear mechanisms. The failure of CVD diamond-coated inserts during machining can be in the form of flaking (interfacial failure) or abrasive wear (gradual cohesive failure) [22]. Ideally, a test of superb adhesion is when the diamond coating fully deteriorates by wear rather than flaking. Flaking will occur primarily due to poor adhesion between the diamond coating and the carbide substrate [6]. Therefore, flaking is clearly undesirable because the benefit of using a diamond coating is lost, except for the chip breaking assistance of faceted diamond crystals at the rake surface [29, 75]. If the adhesion strength of the CVD diamond coating is sufficient to withstand the machining stresses, then the abrasive action between the workpiece material and the diamond coating becomes the primary failure mechanism. Unless the CVD diamond coating is polished, a two-step wear mechanism is ex­ pected to occur. The first step is caused by the initial high surface roughness of the CVD diamond coating in which crack initiation occurs at the surface. The mecha­ nism that describes such behavior was proposed by Gunnars and Alahelisten [56]. They described a three-zone wear model as shown in Fig. 6. In this model, the role of residual stresses becomes significant in controlling crack propagation from the surface to the interface that could lead to interface failure (flaking). As outlined earlier, the high total compressive residual stress present in CVD diamond coatings on carbide inserts was assumed to be biaxial and oriented parallel to the interface. Wear starts to occur at the surface, which, because of geometry, allows stress to relax. A crack is more likely to initiate at protruding grains in zone I and propa­ gate preferentially along the (111) easy cleavage planes of diamond. The geometry at deeper depths, however, prevents the compressive residual stress from relaxing. Therefore, as the crack propagates deeper in the coating, it encounters higher com­ pressive stresses that cause the cracks to redirect their paths deviating from cleavage planes to a direction parallel to the interface in region II. The high compressive stress now causes cracks to propagate fast parallel to the interface resulting in a smooth surface in region III. Due to the smoother surface, fewer asperities will be present and it becomes harder to nucleate cracks." In Adhesion Aspects of Thin Films, Volume 1. CRC Press, 2014. http://dx.doi.org/10.1201/b11971-20.

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Conference papers on the topic "Crack Propagation Path"

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Yang, Xiaoyu, Stéphane Marie, and Clémentine Jacquemoud. "Cleavage Crack Path Prediction in a PWR Vessel Steel." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28418.

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Cleavage crack propagation has been tested for three different geometries of Compact Tensile (CT) specimens: CT25, CT50 and extended CT25 (CT25 with CT50 width) (Figure 3). The experimental results show that the crack paths are straight for CT25 and CT50, but they are unstable and curved for extended CT specimens (Figure 5 to 7). Numerical computation had been performed by extended finite element method (XFEM) in CAST3M software. 2D modeling was used in order to predict the crack path. The analysis was based on a local non-linear dynamic approach with a RKR fracture stress criterion depending on temperature and strain rate. In order to simulate the curvature of the cracks path, a statistical effect was introduced in the model to take into account the spatial distribution of cleavage initiators, which is the characteristic of cleavage fracture. At each step of propagation during the modeling, the direction was randomly chosen, according to a uniform defects distribution. The numerical results show a good agreement with experience. The different crack paths were curved in extended CT25, but remained almost straight in CT25 and CT50 specimens, despite of the instability introduced in the modeling in the propagation direction. These results show that the statistics of micro-defects can induce, jointly with the geometry of specimen, a large scatter of crack propagation paths.
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Mukai, Minoru, Kenji Hirohata, Hiroyuki Takahashi, Takashi Kawakami, and Kuniaki Takahashi. "Damage Path Simulation of Solder Joints in QFP." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73297.

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Fatigue life prediction of solder joints is one of the most important areas of research in the development of reliable electronic packages. Recent trends in electronic package development indicate a shift toward smaller solder joints and larger package sizes, and temperature changes under field conditions are also becoming greater. Since reliability design of solder joints has become severer, the estimation of the crack propagation is becoming important like the estimation of the crack initiation. In the present study, a new method of estimating the crack propagation, which is based on finite element analysis without geometrical crack model, was examined, in order to ensure suitability for practical use in electronic package design. On the basis of a damage model assumed for Sn-37Pb solder, the new method called ‘damage path simulation’ was verified for solder joints in QFP (Quad Flat Package). In the case of solder joints of the gull-wing type, fatigue cracks are commonly initiated from the upper surface of the solder fillet, and propagated in the vicinity of the interface with the outer lead. It was clear that the extension of the damage path showed good agreement with the behavior of crack propagation observed in the actual thermal cycle tests. Damage path extension from a pointed end of outer lead is also simulated simultaneously with that from the upper surface of the solder fillet, and both damage paths were finally combined at a gap between outer lead and printed circuit board. The advantage of the present method is especially evident when the fatigue cracks were initiated from two or more regions. From the results of this study, it was concluded that the estimation of the crack propagation in solder joints based on the present method is satisfactory for engineering purposes.
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Jelaska, Damir T., Srecko Glodez, and Srdjan Podrug. "Numerical Modelling of the Crack Propagation Path at Gear Tooth Root." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48026.

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A numerical model for determination of service life of gears in regard to bending fatigue in a gear tooth root is presented. The Coffin-Manson relationship is used to determine the number of stress cycles Ni required for the fatigue crack initiation, where it is assumed that the initial crack is located at the point of the largest stresses in a gear tooth root. The simply Paris equation is then used for the further simulation of the fatigue crack growth, where required material parameters have been determined previously by the appropriate test specimens. The functional relationship between the stress intensity factor and crack length K = f(a), which is needed for determination of the required number of loading cycles Np for a crack propagation from the initial to the critical length, is obtained numerically. The total number of stress cycles N for the final failure to occur is then a sum N = Ni + Np. Although some influences were not taken into account in the computational simulations, the presented model seems to be very suitable for determination of service life of gears because numerical procedures used here are much faster and cheaper if compared with the experimental testing.
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Bousquet, Amaury, Stéphane Marie, and Philippe Bompard. "Cleavage Crack Propagation and Arrest in a Nuclear Pressure Vessel Steel." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78174.

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The integrity assessment of Reactor Pressure Vessels, mainly based on crack initiation, can be completed by studying crack propagation and arrest. Whereas engineering approaches do not take into account dynamic effects, these effects are important in unstable cleavage crack propagation, arrest and possible propagation re-initiation events. This study deals with physical mechanisms of cleavage crack propagation and numerical computations related to brittle fracture in the framework of local approach to fracture. Experiments were carried out on thin CT 25 specimens made of 16MND5 PWR vessel steel at five temperatures (−150°C, −125°C, −100°C, −75°C, −50°C). Two kinds of crack path, straight or branching path, were observed. Branching cracks appear for the highest critical loadings at initiation, that increase the elastic stored energy and the effect of plasticity. The elastic-viscoplastic behavior of the ferritic steel was studied up to a strain rate of 104 s−1 and taken into account in the numerical simulations. The eXtended Finite Element Method (X-FEM) was used in CAST3M FE software to model crack propagation. Numerical computations combine a local non linear dynamic approach with a RKR type fracture stress criterion. The different physical micro-mechanisms, involved in cleavage fracture, were examined by the means of SEM fracture surface analyses at different temperatures and strain rates for the two kinds of crack path. The links of the critical fracture stress with both temperature and strain rate for straight crack path as well as analyses of branching crack phenomena were considered by the means of Scanning Electron Microscopy (SEM) fracture surface analyses, 3D quantitative optical microscopy and FE computations in order to aim at a robust physical justification of the propagation model which has already been developed at CEA in the frame of the B. Prabel PhD.
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Kim, Won Beom. "Effect of stop hole on stress intensity factor in crack propagation path." In INTERNATIONAL CONFERENCE ON CIVIL, MECHANICAL AND MATERIAL ENGINEERING: ICCMME 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5041417.

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Yamamoto, Masato, Takayuki Kitamura, and Takashi Ogata. "Effect of Microscopic Inhomogeneity on Creep-Fatigue Crack Propagation of Transversally Loaded Directionally Solidified Superalloy." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/creep2007-26467.

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Directionally solidified superalloy, which has elongated large grains, is used for a gas-turbine blade because of its high creep strength. Since the grain size is not small enough in comparison with the size of component and crack, the inhomogeneous microstructure strongly affects the crack propagation behavior. The aim of this research is to clarify the microstructural effect in the creep-fatigue under a transverse load. The experiment reveals characteristic crack path and fluctuation of crack propagation rate in detail. Several intergranular sub-cracks initiated ahead of the tip of main crack occasionally connect with each other and form a complicated crack path. The deformation near the crack tip during a loading cycle is highly dependent on the local grain boundary network, grain shape, and crack shape. The magnitude of da/dN is correlated fairly well with that of local deformation in the vicinity of crack tip. This suggests that the stress field near the crack tip governs the crack propagation.
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Zhu, Ming-Liang, Fu-Zhen Xuan, Guo-Zhen Wang, and Zheng-Dong Wang. "Research on Microstructure Dependence of Near-Threshold Fatigue Crack Propagation by Combined Analyses of Fracture Surface and Fatigue Crack Growth Path." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77448.

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Near-threshold fatigue crack growth behavior was investigated in a newly developed steel 25Cr2NiMo1V with different heat treatments to meet different property requirements of high-pressure (HP) and low-pressure (LP) parts in the combined steam turbine rotor. The load-shedding method was adopted in the near-threshold fatigue crack growth experiment at room temperature with a constant load ratio of 0.1. Combined analyses of crack surface and fatigue crack growth path were carried out to identify the dominant crack growth mechanisms in both HP and LP. Results show that in the threshold regime, fatigue crack growth resistance of the HP is clearly superior to that of LP and hence shows strongly dependence on the microstructure of 25Cr2NiMo1V. The distributed bainitic microstructures and larger prior austenite grain size in HP result in more tortuous crack propagation path than that in LP. Compared with ferritic blocks in HP, the tempered martensitic laths in LP do not play a dominate role in stopping the fatigue crack advance.
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8

Gao, Feng, Jianping Jing, Janine Johnson, Frank Z. Liang, Richard L. Williams, and Jianmin Qu. "Loading Direction Versus Crack Propagation Path in a Lead-Free Single Solder Joint Sample." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68099.

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In this paper, single solder joints (SSJs) were subjected to moderate speed loading (5mm/sec) in different directions, from pure tensile, mixed mode to pure shear. Fracture surfaces from different loading directions were examined both experimentally and numerically. It is observed that intermetallic compound (IMC) is formed between the solder alloy and the Cu pad, and failure typically occurs at or near the solder/IMC/Cu interfaces on the board side. Pure tensile loading typically leads to interfacial fracture along the IMC/Cu interface. Mixed mode loading usually results in a mixture of interfacial and cohesive failure with crack propagating in a zigzag fashion between the solder/IMC interface and the solder alloy. Loading with higher shear component tends to result in more cohesive failure of the solder alloy near the solder/IMC interface. Under pure shear loading, failure is almost always cohesive within the solder alloy near the solder/IMC interface.
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Hutchison, Emily K., Philippa L. Moore, and Warren P. Bath. "SENT Stable Tearing Crack Path Deviation and its Influence on J." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45480.

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Crack path deviation in Single Edge Notch Tension (SENT) specimens, and its influence on the determination of J, has been investigated as part of the development of a new British Standard for SENT testing, BS 8571 [1]. Crack path deviation by angles up to 50° have been observed during stable tearing in parent material SENT specimens. This paper investigates the effect of crack path deviation on the measured fracture toughness, and offers a correction formula when crack path deviation invalidates the default standard J equations. Mixed mode effects in crack path deviation are also investigated. A parametric study using finite element analysis has been carried out to compare the value of J calculated using standard equations (which assume a straight crack propagation path) with the value of J calculated using the contour integral method for different levels of crack path deviation. Crack path deviation from the initial crack plane resulted in a non-conservative estimate of fracture toughness using the standard equations. This means that any SENT test exhibiting crack path deviation may need to be discarded, wasting valuable test specimens. Instead, a correction factor has been developed to adjust the calculated value of J if path deviation is observed.
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Eriksson, Robert, and Krishna Praveen Jonnalagadda. "A Study on Crack Configurations in Thermal Barrier Coatings." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63610.

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Spallation of thermal barrier coatings subjected to thermal fatigue occurs through cracking in or close to the metal–ceramic interface. To better match an experimentally observed damage progression curve with initially slow crack growth followed by rapid crack growth, a multitude of crack paths were modeled in a finite element analysis. Comparisons with experimental data enabled the most likely crack path to be identified. It was shown that the most likely failure type for the studied TBC system was crack initiation from pre-existing defects in the thermal barrier coating which propagated into the interface, leading to spallation. The results were used to fit a crack propagation model.
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