Готові списки джерел за темами / Crack Propagation Analysis

Добірка наукової літератури з теми "Crack Propagation Analysis"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Crack Propagation Analysis"

1

Ballarini, R., and S. Muju. "Stability Analysis of Bridged Cracks in Brittle Matrix Composites." Journal of Engineering for Gas Turbines and Power 115, no. 1 (January 1, 1993): 127–38. http://dx.doi.org/10.1115/1.2906667.

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The bridging of matrix cracks by fibers is an important toughening mechanism in fiber-reinforced brittle matrix composites. This paper presents the results of a nonlinear finite element analysis of the Mode I propagation of a bridged matrix crack in a finite size specimen. The composite is modeled as an orthotropic continuum and the bridging due to the fibers is modeled as a distribution of tractions that resist crack opening. A critical stress intensity factor criterion is employed for matrix crack propagation, while a critical crack opening condition is used for fiber failure. The structural response of the specimen (load-deflection curves) as well as the stress intensity factor of the propagating crack is calculated for various constituent properties and specimen configurations for both tensile and bending loading. By controlling the length of the bridged crack, results are obtained that highlight the transition from stable to unstable behavior of the propagating crack.
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2

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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3

Sun, Yazhen, Ting Yan, Changyu Wu, Xiaofang Sun, Jinchang Wang, and Xuezhong Yuan. "Analysis of the Fatigue Crack Propagation Process of the Stress-Absorption Layer of Composite Pavement Based on Reliability." Applied Sciences 8, no. 11 (October 30, 2018): 2093. http://dx.doi.org/10.3390/app8112093.

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The stress-absorption layer in cement concrete pavement delays the development of reflection cracks and is good at fatigue resistance. Laboratory investigations of the anti-crack performance of the high viscous asphalt sand stress-absorption layer (HVASAL) and rubber asphalt stress-absorption layer (RASAL) were carried out by force-controlled fatigue crack propagation tests, for which three types of overlay structures with three types of pre-crack (i.e., the middle crack, the side crack, and the 45° inclined crack) were designed. A probability model was established to describe the propagation of the fatigue cracks. The fatigue crack propagation, the fatigue life, the crack propagation rate, and the crack propagation mechanism of the three types of overlay structure were compared and analyzed. The results show that the stress-absorption layers have good anti-crack fatigue performance, and that the RASAL is better than the HVASAL. The crack propagation patterns of the three types of overlay structure were found. In the double logarithmic coordinate, the curves of the three types of cracks are straight lines with different intercepts and slopes. The probability model quantifies the relationship between the crack propagation rate and ∆K. The influences of the three types of crack on the fatigue properties of the asphalt overlays are different.
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4

Zhu, Yong, Ray K. L. Su, and Qi Cai Yu. "Initial Crack Propagation Directions of Branched Crack under Tension with Finite Element Analysis." Advanced Materials Research 168-170 (December 2010): 2553–57. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2553.

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The initial crack propagation directions of branched cracks under tension are investigated. In this study, the material is assumed to be brittle and deformed linear elastically. The elastic stress fields and stress intensity factors are obtained by using finite element analysis method. Various parameters which including the lengths, the directions and the locations of branched cracks are investigated to study their effects on the crack initiation angles. Three kinds of crack propagation criteria are employed to obtain the crack initiation angles. The effects of crack propagation directions due to the use of different crack initiation criteria are studied and discussed in details.
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5

Li, De Jian, Fei Zhao, Run Jie Ma, Li Qiang Han, and Xiao Hu Wu. "Analysis of Cracking Processes of Sandstone in Rockburst Test." Applied Mechanics and Materials 256-259 (December 2012): 1052–59. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1052.

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High speed camera system is used to record crack propagation on rock surface during the lab rocburst experiment. This paper presents the specific analytical method of crack propagation with high speed images. Crack propagation types and directions are briefly described, and the lengths, growth rate and fractal dimension of cracks are calculated. The results show that the crack grows mainly along the horizontal line on the unloading surface, at a low speed before rockburst and reaches a very high speed abruptly near the burst point. The fractal dimensions demonstrated that the crack turns to be rough when rockburst happens. The study on the crack propagation is benefit to the understanding on the mechanism of rockburst.
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6

Liu, Ning, and Chun Sheng Zhang. "Numerical Analysis on Splitting Failure of Brittle Material." Advanced Materials Research 143-144 (October 2010): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.156.

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Анотація:
Realize the basic process of fracture analysis in ANSYS. The fore treatment program of crack propagation simulation is compiled by parameterization method of apdl. The calculation and analysis is automatic. ANSYS is well for simulating the structures which contain cracks and bugs. When the parameters are suitable, the propagation of cracks can be simulated well in ANSYS. The different phases of crack propagation are simulated. To compare with the results by theory, perfect the formation process and mechanism of splitting cracks.
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7

Chen, Zhong Hui, Jing Jing Feng, Li Li, and He Ping Xie. "Fracture Analysis on the Interface Crack of Concrete Gravity Dam." Key Engineering Materials 324-325 (November 2006): 267–70. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.267.

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Some numerical parameters-sensitivity analysis has been conducted to evaluate the stability and propagation of the interface cracks at heel of concrete gravity dam. In this paper, utilizing the software ANSYS to simulate the stress and displacement fields of the tip of the interface cracks between concrete gravity dam and foundation, the stress intensity factor (SIF) of the interface crack is analyzed using facture mechanics. Three impacting factors have been discussed, such as the crack length, the angle of crack, and the water height. Critical length and loads of interface crack propagation are obtained using composite fracture criteria. The results indicate that the coarse interface retards the propagation of interface crack, and redounds to stability of gravity dam. It is found that the interface crack often propagates alone the interface between dam and foundation, simultaneously the branch crack kinks to foundation at the specific condition.
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8

Gulzar, Mubashir. "Linear Analysis of Crack Propagation in a Solid Rocket Propellant." Applied Mechanics and Materials 229-231 (November 2012): 742–46. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.742.

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Анотація:
The Solid Rocket Propellant in its crude form is a rubber like material. This rubber like material performs very interestingly when used to study crack propagation. Blunting of crack tips occurred in the composite when the load is applied, which is generally non-linear phenomenon. The crack propagation analysis for such case is generally taken for double edge cracks but the presence of central cracks in the composites cannot be ignored. This trend is nonlinear and complex. In order to simplify things, optical grade polyurethane material is used instead. The polyurethane material we used for our experimental work was PSM-4. In this research work, an extensive study is made regarding crack propagation analysis using the basic principles of fracture mechanics and its different techniques for finding out the parameter necessary for tracing crack propagation. Mode 1 (Opening Mode) is considered for the central crack propagation analysis. The objectives set in this context are the determination of Stress Intensity Factor of central crack in the specimen using photoelastic experimental data and simulation of central crack in softwares (ANSYS, Pro-e). For this purpose a rectangular plate with Central Crack was used to be experimented upon using the techniques of Photoelasticity. A comparative analysis technique is adopted to compare the effectiveness of results from experiments as well as software simulations.
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9

Yuan, Duan Cai, Guo Jin Tang, Yong Jun Lei, and Shang Yang Meng. "Analysis of the Surface Cracks of Long Range Storage Solid Motor Grain." Key Engineering Materials 324-325 (November 2006): 93–96. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.93.

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The surface cracks are easy to occur in the solid missile motor grain. The solid missile motor grain with cracks is very dangerous when it is lunched, because the surface cracks might be propagation unstable when the internal pressure enters the surface cracks cavity. In order to analyze the surface crack of solid motor grain, with accelerated aging test, the variation law of mechanics properties of propellant in the storage period is obtained. Under internal pressure and axial acceleration loading, the three-dimension finite element models of the motor grain are established, three-dimension singular crack elements at the tips of surface cracks are established to simulate the cracks propagation. Along with the surface crack propagation, the stress intensity factors of the crack tips in different storage period are calculated to prejudge its stability respectively. The method and conclusions are available for using solid missile motor grain with surface cracks.
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10

Chen, Hao. "Instable Crack Propagation Analysis with PDS-FEM." Applied Mechanics and Materials 234 (November 2012): 53–58. http://dx.doi.org/10.4028/www.scientific.net/amm.234.53.

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This paper studies the stability of dynamic crack propagation in a homogeneous plate with 2 parallel cracks located in an anti-symmetric manner. PDS-FEM is extended to the dynamic setting, and a method to randomly generate unbiased mesh is developed. Monte-Carlo simulation is carried out to study the crack patterns. It is shown that a solution for low and high loading rate displacement loading condition is stable or instable, respectively, since the crack pattern loses anti-symmetricity for the latter boundary condition.
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Дисертації з теми "Crack Propagation Analysis"

1

胡思來 and See-loi Wu. "Numerical analysis of dynamic crack propagation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31208459.

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2

Al-Falou, Ahmed Amir. "A theoretical analysis of crack propagation." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624858.

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Wu, See-loi. "Numerical analysis of dynamic crack propagation /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12354569.

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4

Perng, Jia-Der. "Analysis of crack propagation in asphalt concrete using a cohesive crack model." Connect to this title online, 1989. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1094737677.

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5

Tilbrook, Matthew Thomas Materials Science &amp Engineering Faculty of Science UNSW. "Fatigue crack propagation in functionally graded materials." Awarded by:University of New South Wales. Materials Science & Engineering, 2005. http://handle.unsw.edu.au/1959.4/21885.

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Анотація:
Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step infiltration technique. Compressed polyurethane foam was infiltrated with alumina slip. After foam burn-out and sintering, epoxy was infiltrated into the porous alumina body. Non-graded specimens with a range of compositions were produced, and elastic properties and fatigue behaviour were characterised. An increase in crack propagation resistance under cyclic loading was quantified via a novel analytical approach. A simulation platform was developed with the commercial FE package ANSYS. Material gradient was applied via nodal temperature definitions. Stress intensity factors were calculated from nodal displacements near the crack-tip. Deflection criteria were compared and the local symmetry criterion provided the most accurate and efficient predictions. An automated mesh-redefinition algorithm enabled incremental simulation of crack propagation. Effects of gradient and crack-geometry parameters on crack-tip stresses were investigated, along with influences of crack-shape, crack-bridging, residual stresses and plasticity. The model provided predictions and data analysis for experimental specimens. Fatigue cracks in graded specimens deflected due to elastic property mismatch, concordant with FE predictions. In other FGMs, thermal or plastic properties may dominate deflection behaviour. Weaker step-interfaces influenced crack paths in some specimens; otherwise effects of toughness variation and gradient steps on crack path were negligible. Crack shape has an influence, but this is secondary to that of elastic gradient. Cracks in FGM specimens initially experienced increase in fatigue resistance with crack-extension followed by sudden decreases at step-interfaces. Bridging had a notable effect on crack propagation resistance but not on crack path. Similarly, crack paths did not differ between monotonic and cyclic loading, although crack-extension effects did. Recommendations for analysis and optimisation strategies for other FGM systems are given. Experimental characterization of FGMs is important, rather than relying on theoretical models. Opportunities for optimization of graded structures are limited by the properties of the constituent materials and resultant general crack deflection behaviour.
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6

Nielsen, Kristin. "Crack Propagation in Cruciform Welded Joints : Study of Modern Analysis." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-145134.

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This thesis is investigating how the effective notch method can be used for fatigue assessment of welded joints.  The effective notch method is based on a finite element analysis where the joint is modeled with all notches fictitiously rounded with a radius of 1 mm. Analyses are performed on a cruciform fillet welded joint where parameters such as, load case, steel plate thickness and weld size, are varied. The achieved lifetime estimations are then compared to calculations with other fatigue assessment methods, linear elastic fracture mechanics and the nominal method. The goal is to draw conclusions about pros and cons of the effective notch method. The results are also compared to experimental fatigue tests performed on the same geometry. The results indicates that the effective notch method tends overestimating the lifetime, especially when the steel plate thickness is small. This leads to a non conservative method that is dangerous to use as guidance when designing. The estimations are though better when considering a toe crack then when considering a root crack. Due to a large scatter in experimental test results, it is hard to validate a fatigue assessment method in an absolute sense. That is also the case for the effective notch method, and more results from experimental fatigue tests are needed before the effective notch method can be fully used. For relative analysis, when variations of the same design needs to be compared, the effective notch can be a very powerful tool. This is because of the flexibility for different geometries that this method grants.
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7

Kim, Dong Sub. "Analysis of fatigue crack propagation behavior of a surface crack at fillet toe of tubular joints /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487668215808373.

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8

Blandford, Robert. "Characterization of fatigue crack propagation in AA 7075-T651." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-04092001-152127.

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9

Figiel, Lukasz. "Sensitivity Analysis of Interface Fatigue Crack Propagation in Elastic Composite Laminates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1102358246078-89903.

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Composite laminates are an important subject of modern technology and engineering. The most common mode of failure in these materials is probably interlaminar fracture (delamination). Delamination growth under applied fatigue loads usually leads to structural integrity loss of the composite laminate, and hence its catastrophic failure. It is known that several parameters can affect the fatigue fracture performance of laminates. These include the constituent material properties, composite geometry, fatigue load variables or environmental factors. The knowledge about effects of these parameters on fatigue delamination growth can lead to a better understanding of composite fatigue fracture behaviour. Effects of some of these parameters can be elucidated by undertaking appropriate sensitivity analysis combined with the finite element method (FEM) and related software. The purpose of this work was three-fold. The first goal was the elaboration and computational implementation of FEM-based numerical strategies for the sensitivity analysis of interface fatigue crack propagation in elastic composite laminates. The second goal of this work was the numerical determination and investigation of displacement and stress fields near the crack tip, contact pressures along crack surfaces, mixed mode angle, energy release rate and the number of cumulative fatigue cycles. The third aim of the present study was to use the developed strategies to evaluate numerically the sensitivity gradients of the total energy release rate and fatigue life with respect to design variables of the curved boron/epoxy-aluminium (B/Ep-Al) composite laminate in two different material configurations under cyclic shear of constant amplitude. This study provided novel strategies for undertaking sensitivity analysis of the delamination growth under fatigue loads for elastic composite laminates using the package ANSYS. The numerical results of the work shed more light on mechanisms of interfacial crack propagation under cyclic shear in the case of a curved B/Ep-Al composite laminate. Moreover, the outcome of the sensitivity gradients demonstrated some advantages for using the sensitivity analysis to pinpoint directions for the optimisation of fatigue fracture performance of elastic laminates. The strategies proposed in this work can be used to study the sensitivity of the interface fatigue crack propagation in other elastic laminates, if the crack propagates at the interface between the elastic and isotropic components. However, the strategies can be potentially extended to composites with interfacial cracks propagating between two non-isotropic constituents under a constant amplitude fatigue load. Finally, the strategies can also be used to undertake the sensitivity analysis of composite fatigue life with respect to variables of fatigue load.
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10

Echeverria, Molina Maria Ines. "Crack Analysis in Silicon Solar Cells." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4311.

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Solar cell business has been very critical and challenging since more efficient and low costs materials are required to decrease the costs and to increase the production yield for the amount of electrical energy converted from the Sun's energy. The silicon-based solar cell has proven to be the most efficient and cost-effective photovoltaic industrial device. However, the production cost of the solar cell increases due to the presence of cracks (internal as well as external) in the silicon wafer. The cracks of the wafer are monitored while fabricating the solar cell but the present monitoring techniques are not sufficient when trying to improve the manufacturing process of the solar cells. Attempts are made to understand the location of the cracks in single crystal and polycrystalline silicon solar cells, and analyze the impact of such cracks in the performance of the cell through Scanning Acoustic Microscopy (SAM) and Photoluminescence (PL) based techniques. The features of the solar cell based on single crystal and polycrystalline silicon through PL and SAM were investigated with focused ion beam (FIB) cross section and scanning electron microscopy (SEM). The results revealed that SAM could be a reliable method for visualization and understanding of cracks in the solar cells. The efficiency of a solar cell was calculated using the current (I) - voltage (V) characteristics before and after cracking of the cell. The efficiency reduction ranging from 3.69% to 14.73% for single crystal, and polycrystalline samples highlighted the importance of the use of crack monitoring techniques as well as imaging techniques. The aims of the research are to improve the manufacturing process of solar cells by locating and understanding the crack in single crystal and polycrystalline silicon based devices.
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Книги з теми "Crack Propagation Analysis"

1

A, Meyers C., Stinson H. C, and George C. Marshall Space Flight Center., eds. Comparison of two computer codes for crack growth analysis: NASCRAC versus NASA/FLAGRO. [Marshall Space Flight Center, Ala.]: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1989.

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2

Shimokawa, Toshiyuki. Analysis of fatigue fractographic data of a rod end housing using Monte Carlo simulation. Chofu, Tokyo: National Aerospace Laboratory, 1995.

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3

Mendelson, Alexander. Analysis of mixed-mode crack propagation using the boundary integral method. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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4

Shivakumar, K. N. Three-dimensional elastic-plastic analysis of shallow cracks in single-edge-crack-tension specimens. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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5

C, Newman J., and Langley Research Center, eds. Three-dimensional elastic-plastic analysis of shallow cracks in single-edge-crack-tension specimens. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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6

C, Newman J., and Langley Research Center, eds. Three-dimensional elastic-plastic analysis of shallow cracks in single-edge-crack-tension specimens. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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7

Kolkman, H. J. Microstructural and fractographic analysis of fatigue crack propagation in 2024-T351 and 2324-T39. Amsterdam: National Aerospace Laboratory, 1985.

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8

S, Dawicke D., Newman J. C, and Langley Research Center, eds. Orientation effects on the measurement and analysis of critical CTOA in an aluminum alloy sheet. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1994.

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9

United States. National Aeronautics and Space Administration., ed. Determination of stress intensity factor distributions for "interface" cracks in incompressible, dissimilar materials: Summary report : reporting period - 8/15/94 - 12/31/97 : grant no. NAG-1-1622-Supl. 1-5*. [Washington, DC: National Aeronautics and Space Administration, 1997.

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10

Kitamura, Takayuki. Stochastic modeling of crack initiation and short-crack growth under creep and creep-fatigue conditions. [Washington, D.C.]: NASA, 1989.

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Частини книг з теми "Crack Propagation Analysis"

1

Hills, D. A., and D. Nowell. "Analysis of crack propagation." In Solid Mechanics and Its Applications, 169–93. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8281-0_8.

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Raghav, Mahendra Singh, Amandeep Singh, and Shivdayal Patel. "Crack Propagation Analysis of Spur Gear." In Lecture Notes in Mechanical Engineering, 413–25. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4208-2_30.

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3

Galanis, Konstantinos P., and Vassilios J. Papazoglou. "Crack Propagation in Naval Aluminum Panels." In Experimental Analysis of Nano and Engineering Materials and Structures, 207–8. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_102.

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4

Tardif, Nicolas, Michel Coret, and Alain Combescure. "Instable Crack Propagation at High Temperature." In Experimental Analysis of Nano and Engineering Materials and Structures, 231–32. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_114.

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Olzak, M., J. Stupnicki, and R. Wójcik. "Analysis of crack front propagation in contact." In Residual Stress in Rails, 45–62. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1787-6_3.

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6

Ozakgul, Kadir, Ozden Caglayan, Ovunc Tezer, and Erdogan Uzgider. "Crack Propagation Analysis of New Galata Bridge." In Experimental and Applied Mechanics, Volume 6, 471–78. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9792-0_73.

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7

Ohmura, Etsuji, Takashi Okazaki, Keiichi Kishi, Toshio Kobayashi, Masahiro Nakamura, Satoshi Kubo, and Komei Okatsu. "Crack Propagation Analysis in Underwater Laser Drilling." In Materials with Complex Behaviour II, 715–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22700-4_45.

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Osaki, Hiroaki, Hitoshi Matsubara, and Genki Yagawa. "3D Crack Propagation Analysis Using Free Mesh Method." In Computational Methods in Engineering & Science, 201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-48260-4_47.

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Chen, Jing Xi, Guang Zhang, Hua Zhang, and Yali Guan. "Monitoring Analysis for the Velocity of Crack Propagation." In Advances in Fracture and Damage Mechanics VI, 353–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.353.

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Valliappan, S., and V. Murti. "Partial Energy Absorbing Boundary for Dynamic Crack Propagation." In Transient/Dynamic Analysis and Constitutive Laws for Engineering Materials, 67–74. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3655-3_6.

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Тези доповідей конференцій з теми "Crack Propagation Analysis"

1

Doi, Hiroaki, and Kisaburo Azuma. "Simulation on Propagation and Coalescence of Fatigue Crack by Automatic Three-Dimensional Finite Element Crack Propagation System." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63151.

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Verification analyses of the CRACK-FEM developed to predict the propagation of age-related cracks detected in complicated-shaped components of nuclear power plants are presented. Four fatigue crack propagation tests for plate specimens with one and two initial surface cracks subjected to cyclic tensile and bending load respectively are simulated using the CRACK-FEM, and the analysis results are compared with the experimental data of the tests in literature. For the specimens with one crack, the relation between the number of load cycles and the crack size obtained by the analyses agrees with the experimental data. For the specimens with two cracks, the analysis results until the crack coalescence and the timing of the crack coalescence obtained by the analyses agree with the experimental data. In tensile fatigue test for specimen with two cracks, the relation between the number of load cycles and the crack size after the crack coalescence obtained by the analysis almost agrees with the experimental data, although a little difference of analysis from the experimental data is seen. However, in bending fatigue test for specimen with two cracks, the analysis results for all the number of load cycles show good agreement with the experimental data.
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Kunaporn, Chalitphan, Mahendra Singh, Mayuresh Patil, and Rakesh Kapania. "Random Crack Propagation Analysis of a Beam with a Crack." In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
18th AIAA/ASME/AHS Adaptive Structures Conference
12th. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-2940.

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Tanaka, S., S. Okazawa, and H. Okada. "Crack Propagation Analysis using Wavelet Galerkin Method." In 9th International Conference On Analysis of Discontinues Deformation: New Developments and Applications. Singapore: Research Publishing Services, 2009. http://dx.doi.org/10.3850/9789810844554-0108.

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Cui, Wei, and Jianjun Wang. "Probabilistic Analysis of Gas Turbine Disk Multi-Crack Propagation." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45439.

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An approach of predicting probabilistic life of multi-source surface crack growth problem is described in the paper. Multi-source circumferential surface cracks occur occasionally on aircraft engine turbine disk. A serious of semi-elliptical cracks which located in a certain radius but different circumferential position on turbine disk was caused by low-cycle fatigue. The residual life should be predicted according to the damage tolerance design theory. A typical turbine disk was studied as a numerical example by using finite element method. The existing experimental result in literature shows that the surface crack propagates faster on circumferential direction than on axial direction, and the surface cracks are going to merge on circumferential direction, which made the multi-crack a closed ring crack. The experiment shows that the multi-cracks would merge into a 2/3 circle crack after certain number cycles which agrees the numerical simulation. Then the crack model was reasonable simplified to axial direction 2-D crack problem in meridian plane of turbine disk. This 2-D axisymmetric simplification significantly reduces the probabilistic analysis computational time. The randomness of materials, load and geometric imperfection is considered in sensitivity analysis by using response surface method. Then the probabilistic life is predicted by considering the major random variables of initial crack length and engine speed. The probabilistic life analysis result is also compared with the existing experimental results.
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Minnebo, Hans, Marc Duflot, and Eric Wyart. "Crack Initiation and Propagation as Part of Engineering Design." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82032.

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This article deals with the interest of the analysis of cracks in order to improve analysis design. Mainly oriented around the linear elastic fracture mechanics and fatigue crack propagation, it will also address some issues in non-linear fracture mechanics and crack insertion.
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Mao, Wengang, Jingxia Yue, Da Wu, Luis De Gracia, and Naoki Osawa. "Uncertainties of Crack Propagation Analysis in Ship Structures." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54226.

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Fatigue cracks can be observed quite frequently on today’s ocean crossing vessels. To ensure the safety of ship structures sailing in the sea, it is important to know the residual fatigue life of these damaged ship structures. In this case, the fracture mechanics theory is often employed to estimate how fast these cracks can propagate along ship structures. However, large uncertainties are always associated with the crack prediction and residual fatigue life analysis. In this study, two uncertainties sources will be investigated, i.e. the reliability of encountered wave environments connected with shipload determinations and different fracture estimation methods for crack propagation analysis. Firstly, different available codes based on fracture mechanic theory are used to compute the stress intensity factor related parameters for crack propagation analysis. The analysis is carried out for both 2D and 3D cases of some typical ship structural details. The comparison is presented to illustrate the uncertainties of crack propagation analysis related with different codes. Furthermore, it is assumed that the structural details will undertake dynamic loading from a containership operated in the North Atlantic. A statistical wave model is used to generate wave environments along recorded ship routes for different years. The uncertainties of crack growth analysis related with encountered weather environments is also investigated in the study. The comparison of these two uncertainties indicated the requirement of further development for the fracture mechanics theory and associated numerical codes, as well as the reliable life-cycle encountered weather environments.
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Santos, Dexter Delos, Jefferson Talledo, and Mark Renier Santos. "Package Failure Understanding Through Crack Propagation Analysis." In 2022 IEEE 24th Electronics Packaging Technology Conference (EPTC). IEEE, 2022. http://dx.doi.org/10.1109/eptc56328.2022.10013304.

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Kim, Donghyun, Andrew Mawer, Glenn Y. Masada, and Tess J. Moon. "Modeling and Analysis of Crack Growth in SnPb and SnAgCu Solder Joints in PBGA Packages: Part II — Crack Propagation." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43237.

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Part II of this paper describes an experimental and analytical study of crack propagation in SnPb and SnAgCu solder joints in 357-PBGA packages exposed to 30-minute thermal cycles of 0 to 100°C. Experimental results show that cracks propagate faster at the package interface than at the board interface; secondary cracks from at the package interface, but grow much slower than the primary cracks; and crack growth rates in SnPb joints are about 50% larger than in SnAgCu joints. A crack propagation model, developed using the fracture mechanics approach, calculates the energy release rate at the crack tip. Using this rate and experimental crack length data, crack propagation rates were computed. Simulation results show the effects of solder type and aging conditions on crack propagation rates and the effects of the number of cracks in a joint on crack propagation life.
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Aihara, Shuji, Kazuki Shibanuma, Yasuhito Imai, Taishi Fujishiro, and Takuya Hara. "Evaluation on Dependence of Ductile Crack Propagation Resistance on Crack Velocity." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90637.

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Plastic strains were measured near a propagating ductile crack in drop-weight tear tests (DWTT). Plastic work evaluated from the plastic strains agreed with crack propagation energy evaluated from dynamic load versus displacement curve. Furthermore, plastic strains were measured near a propagating ductile crack in a full-scale burst tested pipes. Plastic work of the burst pipe was found to be much larger than that of the DWTT. Values of the plastic work of the DWTT and the burst pipe were plotted against crack velocity to construct crack resistance curve. Reason to the increased crack resistance with crack velocity was understood as a dependence of plastic strain distribution on crack velocity by elasto-plastic dymanic finite element analysis.
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Wang, Donghui, Qingna Zeng, Fenggang Zang, and Yixiong Zhang. "Vibration Propagation Analysis of Periodic Pipeline With Crack Defects." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-60988.

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Abstract In this paper, the vibration propagation characteristic is investigated for periodic composite pipeline with crack damage. A novel modified transfer matrix method (TMM) is developed to investigate transverse Band Gap structures (BGs) considering fluid structure interaction, and validated by frequency response function (FRF) for finite period. Field transfer matrix is developed for straight pipeline conveying fluid, and point transfer matrix is derived for circumferential cracks damage based on spring hinge model, which could estimate the equivalent rotational stiffness by local flexibility coefficient method. It’s demonstrated that the existence of small crack damage has negligible effect on BGs, while severe crack damage has significant influence on vibration propagation even it only exists in a single cell. Meanwhile, the difference of FRF between cracked and perfect pipeline provides new idea in diagnosing the crack status. The influence of crack damage on BGs is mainly attributed to the equivalent rotational stiffness. Location of crack damage could affect the stiffness ratio of composite pipeline, and result in the change of original BGs. This study enriches the theoretical TMM for pipeline systems vibration with crack damage, and provides some reference for the stability design of periodic pipeline structures.
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Звіти організацій з теми "Crack Propagation Analysis"

1

Blumenthal, Saul, and Prem Goel. Fatigue Crack Propagation: Probabilistic Modeling and Statistical Analysis. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada195885.

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Malik. L51877 Crack Arrest Toughness to Avoid Dynamic Ductile Fracture in Gas Transmission Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2001. http://dx.doi.org/10.55274/r0010192.

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Design against long ductile fracture propagation in gas pipelines involves an analysis of the balance between driving force, derived from the gas pressure, and the fracture resistance of the material. Initially, the shelf energy in the Charpy test was successfully used as a measure of fracture propagation resistance. As material strength, pipe diameter and operating pressures increased and required greater fracture propagation resistance, the limitations of the Charpy energy approach became increasingly apparent. This limitation for modern steels is due to the fact that the Charpy test involves significant energy absorption contributions from processes not related to fracture propagation. If an energy-balance approach is to be maintained, and if material resistance is to be measured in a fairly simple laboratory notch bend test (e.g. Charpy or drop-weight tear), the problem reduces to the isolation of the propagation energy absorption per unit of crack advance. To resolve crack propagation energy, a novel modification was evaluated for both Charpy and DWTT specimens by employing a back-slot including a snug fitting shim to replace the removed material. In most cases, this modification was effective in curtailing the load-displacement trace when the propagating crack interacted with the slot on the backside of the specimen. It is also noted that this approach did not affect the initial portion of the load-displacement history and thus allowed crack propagation energies to be resolved.
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Hair. L52003 Application of the Crack Layer Theory for Understanding and Modeling of SCC in High Pressure. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2003. http://dx.doi.org/10.55274/r0010893.

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A stochastic features of SCC colony, such as corrosion pit distribution, SC crack initiation from the pits and SC crack aspect ratio, SC crack cluster formation, SC cluster interaction and instability, are observed and characterized. A concept of a single crack equivalent to a cluster of cracks is introduced to simplify computational work on clusters evolution and instability. Various criteria of equivalence for different stages of clusters evolution are discussed. An accelerated test with a number of accelerating factors has been designed and performed for simulation of individual SC crack growth. Corrosion products at each stage of single crack propagation are investigated by means of Raman and FTIR analysis. The crack layer theory is adopted for modeling of SC crack growth. It provides the formalism for modeling of the effect of such processes as electro-chemical reactions, hydrogen embrittlement, and mechanical loading rates on crack growth rate. Finally, a computer simulation of SC crack growth was performed and validated by the available set of experimental data.
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Hanson and McNealy. PR-366-083506-R01 Guidelines for In Situ Characterization of Cracks. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2010. http://dx.doi.org/10.55274/r0010736.

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The purpose of this project was to establish a practical metallographic protocol to distinguish between high pH SCC and near-neutral pH SCC in the ditch. The protocol addresses how to distinguish the crack propagation modes. In addition, the protocol addresses procedures for preparation of sample location areas for analysis through the use of mechanical, electrical, and chemical means considering the quality of results, ease of use, portability, and reliability.
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Bruce. L52090 Near-Neutral pH SCC - Dormancy and Re-Initiation of Stress Corrosion Cracks. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 2003. http://dx.doi.org/10.55274/r0011360.

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The objective of this research project was to identify the environmental, metallurgical, and mechanical conditions that lead to dormancy and re-initiation of previously dormant stress corrosion cracks. These parameters would assist pipeline operators in mitigating near-neutral pH SCC on their systems, and allocating resources for pipeline maintenance. Unload-reload transients were found to increase the crack growth rate in the majority of the experiments and to re-initiate dormant stress corrosion cracks in several cases. On the other hand, there was no consistent effect of the presence or magnitude of overloads on crack growth behavior. The simulated hydrostatic tests had relatively little effect on the crack velocities for near dormant conditions, but consistently inhibited subsequent crack growth for actively growing cracks. The results of analyses of the data and modeling suggest that the R ratio (ratio of minimum to maximum pressure) and frequency of pressure fluctuations on an operating pipeline can be used as a tool to rank segments of pipelines base on the mechanical driving force for propagation of near neutral pH SCC. The concept of a critical crack tip strain rate, which can be related to the R ratio and frequency, also can be used to reasonably predict whether a given set of loading conditions will lead to dormancy.
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Rudland. L52245 Improvements to the Two Curve Ductile Fracture Model - Soil-Elastic and Plastic Contributions. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2007. http://dx.doi.org/10.55274/r0010625.

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The most commonly used fracture analyses procedure for the prediction of minimum arrest toughness and fracture speed for axially running cracks in line pipe materials for natural gas transmission pipeline applications is the Battelle Two-Curve approach. This analysis procedure incorporates the gas-decompression behavior with the fracture toughness of the pipe material to predict the minimum Charpy energy required for crack arrest. For this model, the effect of backfill on the propagating crack fracture speeds is lumped into one empirically based �backfill coefficient,� which does not distinguish different soil types or strengths. This report provides a better understanding of soil behavior and its affect on the fracture speed of running axial flaws in buried line pipe materials. The results from this program are combined with other full-scale experimental data in developing a modification to the treatment of backfill in the Battelle Two-Curve approach for calculating minimum arrest toughness. This first major improvement to the Battelle Two-Curve approach is incorporated into a computer code called PIPE-DFRAC.
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Beavers and Gerst. GRI-00-8717 Effect of Soil Constituents on Near Neutral pH SCC Propagation. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), February 2005. http://dx.doi.org/10.55274/r0011249.

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The objectives of the research were to verify the preliminary observation from the previous TCPL research that some soils contain constituents that promote near-neutral pH SCC and to identify possible constituents. Crack growth tests were performed on samples of susceptible line pipe steel in two of the most potent cracking soils from a previous research project performed for TransCanada Pipelines, followed by analyses of the soil/electrolyte environments at the completion of the tests.� Corrosion potential and corrosion rate measurements also were performed on specimens of the line pipe steel in the electrolytes.
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