Relevant bibliographies by topics / R-curve

Contents

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

Academic literature on the topic 'R-curve'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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Journal articles on the topic "R-curve"

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Ghadirdokht, A., and M. Heidari-Rarani. "Delamination R-curve behavior of curved composite laminates." Composites Part B: Engineering 175 (October 2019): 107139. http://dx.doi.org/10.1016/j.compositesb.2019.107139.

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Short, J. S., and D. W. Hoeppner. "R-curve thermodynamics revisited." International Journal of Fracture 45, no. 2 (1990): 145–57. http://dx.doi.org/10.1007/bf00037172.

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KAHRAMAN AKSOYAK, Ferdağ. "Quaternionic Bertrand curves according to type 2-quaternionic frame in $\mathbb{R}^{4}$." Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics 71, no. 2 (2022): 395–406. http://dx.doi.org/10.31801/cfsuasmas.991631.

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In this paper, we give some characterization of quaternionic Bertrand curves whose the torsion is non-zero but bitorsion is zero in $\mathbb{R}^{4}$ according to Type 2-Quaternionic Frame. One of the most important points in working on quaternionic curves is that given a curve in $\mathbb{R}^{4}$, the curve in $\mathbb{R}^{3}$ associated with this curve is determined individually. So, we obtain some relationships between quaternionic Bertrand curve $\alpha^{(4)}$ in $\mathbb{R}^{4}$ and its associated spatial quaternionic curve $\alpha$ in $\mathbb{R}^{3}$. Also, we support some theorems in th
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Farnsworth, David L. "Axes for symmetric convex curves." Mathematical Gazette 102, no. 553 (2018): 23–30. http://dx.doi.org/10.1017/mag.2018.4.

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Curves are given in polar coordinates (r, θ)by equations of the form r = f (θ), where for f (θ) > 0 all θ. Consider curves which are symmetric about the origin O, so that, f(θ + π) = f (θ) for all θ. For such a curve, its interior is the set {(r, θ) : 0 ≤ r ≤ f (θ)}. Further, assume that the curve is convex. Recall that a closed curve is convex if a line segment between any two of its points has no points exterior to the curve [1], [2, pp. 198-203]. We call these curves M-curves, because the curves are fundamental objects in Minkowski geometry, where they are called Minkowski circles or sim
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Sarkar, Debasish, Bikramjit Basu, Min Cheol Chu, and Seong Jai Cho. "R-curve behavior of Ti3SiC2." Ceramics International 33, no. 5 (2007): 789–93. http://dx.doi.org/10.1016/j.ceramint.2006.01.002.

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Echabbi, Nidal, and Amina Ouazzani Chahdi. "Direction Curves Associated with Darboux Vectors Fields and Their Characterizations." International Journal of Mathematics and Mathematical Sciences 2021 (November 22, 2021): 1–11. http://dx.doi.org/10.1155/2021/3814032.

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In this paper, we consider the Darboux frame of a curve α lying on an arbitrary regular surface and we use its unit osculator Darboux vector D ¯ o , unit rectifying Darboux vector D ¯ r , and unit normal Darboux vector D ¯ n to define some direction curves such as D ¯ o -direction curve, D ¯ r -direction curve, and D ¯ n -direction curve, respectively. We prove some relationships between α and these associated curves. Especially, the necessary and sufficient conditions for each direction curve to be a general helix, a spherical curve, and a curve with constant torsion are found. In addition to
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Gajdoš, Ľubomír, Martin Šperl, Jan Korouš, and Jiří Kuželka. "Evaluating the Suitability of the Gurson—Tvergaard—Needleman Plasticity Model for Crack Resistance Curve Analysis." Applied Sciences 14, no. 13 (2024): 5882. http://dx.doi.org/10.3390/app14135882.

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The operational safety of oil and gas storage units is crucial, as any potential imperfections or cracks in a container wall could result in fracture. The key parameter in ensuring the integrity of oil and gas storage units is their fracture toughness. For its determination, compact tension (CT) and single-edge notched bend (SENB) specimens are commonly used. However, these specimens may lead to unnecessary conservatism in safety assessments. Single-edge notched tension (SENT) specimens, on the other hand, could be a more acceptable substitute, as they are shown to lead to less conservatism. T
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Crasmareanu, Mircea. "A new generalization of Tzitzeica curves in arbitrary dimension." Annals of the Alexandru Ioan Cuza University - Mathematics 70, no. 1 (2024): 89–99. http://dx.doi.org/10.47743/anstim.2024.00007.

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We generalize the notion of a Tzitzeica curve r in the nth dimension by using the constant ratio of the αth power of the Wronskians W(r′) of the derivative curve r′ and the βth power of the Wronskian W(r) of the original curve. In this context, the powers α and β may be seen as control parameters whose interplay determine special classes of (α, β)-Tzitzeica curves. Our paper is intended to be example–oriented and, therefore, several intriguing, new families of generalized Tzitzeica curves in the nth dimension, such as the power and exponential curves, are introduced and discussed in detail. In
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Jiang, Zhengwen, Shui Wan, Thomas Keller, Zhi Fang, and Anastasios P. Vassilopoulos. "Influence of curved delamination front on R-curve of DCB specimen." Composite Structures 227 (November 2019): 111311. http://dx.doi.org/10.1016/j.compstruct.2019.111311.

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Wolfenden, A., HS Pearson, and DE McCabe. "R-Curve Round-Robin Program for ASTM Recommended Practice for R-Curve Determination (E 561)." Journal of Testing and Evaluation 14, no. 4 (1986): 191. http://dx.doi.org/10.1520/jte11261j.

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Dissertations / Theses on the topic "R-curve"

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Dourado, Nuno Miguel. "R-Curve behaviour and size effect of a quasibrittle material : wood." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13734/document.

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Ce travail concerne des expériences mécaniques, des analyses numériques et des modélisations analytiques de la rupture cohésives (Mode I), vis-à-vis de l’étude du comportement mis en évidence par la courbe de Résistance (Courbe-R) et l’effet d’échelle de structures entaillées en bois massif. Des expériences de fissuration sont combinées à des analyses numériques pour déterminer les propriétés de rupture au moyen d’une procédure appelée Théorie de la Mécanique de la Rupture Linéaire Élastique équivalente (TMRLE), basée sur la complaisance de la structure. La courbe-R, obtenue à partir des expér
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Dourado, Nuno Miguel Moura Marcelo de Valentin Gérard. "R-Curve behaviour and size effect of a quasibrittle material wood /." S. l. : S. l. : Bordeaux 1 ; Universidade do Porto (Portugal), 2008. http://ori-oai.u-bordeaux1.fr/pdf/2008/DOURADO_NUNO_2008.pdf.

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Thèse de doctorat : Sciences physiques et de l'ingénieur. Mécanique : Bordeaux 1 : 2008. Thèse de doctorat : Sciences physiques et de l'ingénieur. Mécanique : Universidade do Porto (Portugal) : 2008.<br>Titre provenant de l'écran-titre.
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Bernardini, Chiara. "Un risultato di h-principle per curve a curvatura costante in R^n." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21250/.

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Oggetto di questa tesi è mostrare che ogni curva liscia immersa nello spazio euclideo n-dimensionale, può essere deformata in una curva con curvatura costante, mediante una perturbazione arbitrariamente piccola della curva iniziale e delle sue rette tangenti. Tale valore costante della curvatura deve essere maggiore o uguale del massimo della curvatura della curva iniziale, e si dimostra che tale limite inferiore è ottimale. Questo significa che le curve lisce di curvatura costante, soddisfano, secondo la terminologia di Gromov, il `relative C^1-dense h-principle' nello spazio delle curve imme
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Cheung, C. M. S. "The R-curve approach for the fracture assessment of an aluminium alloy bridge." Thesis, Swansea University, 2001. https://cronfa.swan.ac.uk/Record/cronfa42424.

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A result of fatigue testing on a full scale aluminium alloy bridge, which is used by the military for temporary crossings, showed an unexpected increase in fracture resistance, compared with its plane strain K[IC]. This increase was due to a combination of low constraint and large stable crack extension in the bridge components. Previous work had attributed the increase to the loss of constraint alone, but the present work shows stable cracking is equally important. The effect of stable cracking in the bridge alloy was first examined experimentally in large 25mm thick 3PB specimens which were
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Heinrich, Benedikt [Verfasser], and Heinrich von [Akademischer Betreuer] Weizsäcker. "Curve interactions in R^2: An analytical and stochastical approach / Benedikt Heinrich. Betreuer: Heinrich von Weizsäcker." Kaiserslautern : Technische Universität Kaiserslautern, 2013. http://d-nb.info/1044294183/34.

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Colafemea, Angelo Antonio. "Modelamento numérico da técnica de normalização linear para determinação de curvas J-R." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-20092016-115454/.

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Neste trabalho os resultados da metodologia de normalização de E. D. Reese e K. H. Schwalbe para a obtenção de curvas J-R, são comparadas com aquelas obtidas pela tradicional Técnica de Variação de Flexibilidade Elástica. Ambos os métodos foram aplicados à um aço de grau nuclear A508-CL3A, quando vários corpos-de-prova miniaturizados 0.394TC[S], foram testados em temperaturas típicas de operação de vasos de pressão nuclear. Corpos-de-prova miniaturizados formam tratados termicamente tentando simular o comportamento exibido pelos aços estruturais quando submetidos à diferentes níveis de exposiç
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Zúñiga, Munizaga Andrés Jahir. "Entire solutions to the inhomogeneous allen-cahn equation in R^2, with a transition on a noncompact curve." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/111186.

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Ingeniero Civil Matemático<br>Este trabajo de memoria de título presenta un estudio de la ecuación de perturbación singular de Allen-Cahn con inhomogeneidad: \begin{equation}\ep^2\div\left(a(x)\cdot\nabla_{x}u(x)\right)+a(x)f(u(x))=0,\quad\text{ en }\quad\R^2 \label{AllenCahnEq}\end{equation} donde $\varepsilon>0$ es un parámetro pequeño, $a(x)$ es un potencial uniformemente positivo y suave, que induce una forma de medir distancias para puntos en $\R^2$, y $f$ es la nolinealidad dada por $f(u)=u-u^3$. El estudio aborda la construcción de soluciones enteras de~\eqref{AllenCahnEq}, bajo la co
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Pásztor, Bálint. "Analýza přežití v R." Master's thesis, Vysoká škola ekonomická v Praze, 2015. http://www.nusl.cz/ntk/nusl-202126.

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Survival analysis is a statistical discipline that analyzes the time to occurrence of certain events. The aim of this thesis is to describe the possibilities of survival analysis in the environment of statistical software R. Theoretical knowledge is applied to real data, parametric and nonparametric estimates of survival functions are evaluated by different methods and compared with each other. In the section focusing on nonparametric models Kaplan-Meier and Nelson-Aalen functions are described. Among the parametric estimates there were included well-known probability distributions, survival f
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Dzugan, Jan. "Crack lengths calculation by unloading compliance technique for Charpy size specimens." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29077.

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The problems with the crack length determination by the unloading compliance method are well known for Charpy size specimens. The final crack lengths calculated for bent specimens do not fulfil ASTM 1820 accuracy requirements. Therefore some investigations have been performed to resolve this problem. In those studies it was considered that measured compliance should be corrected for various factors, but satisfying results were not attained. In the presented work the problem was attacked from the other side, the measured specimen compliance was taken as a correct value and what had to be adjust
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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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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.
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Books on the topic "R-curve"

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1938-, Bradt R. C., and International Symposium on the Fracture Mechanics of Ceramics (5th : 1991 : Nagoya, Japan), eds. Composites, R-curve behavior, and fatigue. Plenum Press, 1992.

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Orange, Thomas W. Method and models for R-Curve instability calculations. National Aeronautics and Space Administration, 1988.

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Orange, Thomas W. Method and models for R-Curve instability calculations. National Aeronautics and Space Administration, 1988.

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Orange, Thomas W. Method and models for R-Curve instability calculations. National Aeronautics and Space Administration, 1988.

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Orange, Thomas W. Estimating the R-Curve from residual strength data. National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Orange, Thomas W. Estimating the R-Curve from residual strength data. National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Center, Langley Research, ed. Multi-lab comparison of R-curve methodologies: Alloy 2024-T3. National Aeronautics and Space Administration, Langley Research Center, 1994.

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Center, Langley Research, ed. Multi-lab comparison of R-curve methodologies: Alloy 2024-T3. National Aeronautics and Space Administration, Langley Research Center, 1994.

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Bradt, R. C. Fracture Mechanics of Ceramics: Composites, R-Curve Behavior, and Fatigue. Springer US, 1992.

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U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering., University of Tennessee Knoxville, and Oak Ridge National Laboratory, eds. Extrapolation of the J-R curve for predicting reactor vessel integrity. Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1992.

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Book chapters on the topic "R-curve"

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Munz, Dietrich, and Theo Fett. "R-Curve Behaviour." In Ceramics. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58407-7_4.

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Pinkall, Ulrich, and Oliver Gross. "Parallel Normal Fields." In Compact Textbooks in Mathematics. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-39838-4_4.

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AbstractFor curves $$\gamma \colon [a,b] \to \mathbb {R}^n$$ γ : [ a , b ] → ℝ n there is an analog $$\kappa \colon [a,b] \to \mathbb {R}^{n-1}$$ κ : [ a , b ] → ℝ n − 1 of the curvature function of a plane curve. In the context of unit speed curves, this function $$\kappa $$ κ determines $$\gamma $$ γ up to an orientation-preserving rigid motion of $$\mathbb {R}^n$$ ℝ n . Before we can define $$\kappa $$ κ , we have to study parallel normal vector fields along a curve in $$\mathbb {R}^n$$ ℝ n .
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Steinbrech, Rolf W. "R-Curve Behavior of Ceramics." In Fracture Mechanics of Ceramics. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3350-4_14.

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Sakai, M., and M. Inagaki. "R-Curve Behavior of Ceramic Materials." In Sintering ’87. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_134.

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McCabe, D. E. "COD Concepts in R-Curve Testing." In The Crack Tip Opening Displacement in Elastic-Plastic Fracture Mechanics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82818-8_5.

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Pinkall, Ulrich, and Oliver Gross. "Curves in $$\mathbb {R}^2$$." In Compact Textbooks in Mathematics. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-39838-4_3.

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AbstractCurves in the plane $$\mathbb {R}^2$$ ℝ 2 are special in several respects: For a closed plane curve $$\gamma $$ γ an enclosed area $$\mathcal {A}(\gamma )$$ A ( γ ) can be defined, providing another geometric functional in addition to length and bending energy.
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Pinkall, Ulrich, and Oliver Gross. "Curves in $$\mathbb {R}^3$$." In Compact Textbooks in Mathematics. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-39838-4_5.

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AbstractFor a closed curve $$\gamma \colon [a,b]\to \mathbb {R}^3$$ γ : [ a , b ] → ℝ 3 with unit tangent field T, we can use a parallel normal vector field to transport a normal vector $$W_a\in T(a)^\perp $$ W a ∈ T ( a ) ⊥ at the starting point of $$\gamma $$ γ to a normal vector $$W_b\in T(b)^\perp $$ W b ∈ T ( b ) ⊥ at the end point.
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Pinkall, Ulrich, and Oliver Gross. "Surfaces and Riemannian Geometry." In Compact Textbooks in Mathematics. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-39838-4_6.

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AbstractThe most simple quantity of a one-dimensional curve $$\gamma \colon [a,b]\to \mathbb {R}^n$$ γ : [ a , b ] → ℝ n is its speed $$|\gamma '|\colon [a,b]\to \mathbb {R}$$ | γ ′ | : [ a , b ] → ℝ .
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Lube, T. "A Knoop-Indentation Method for R-Curve Determination." In Fracture Mechanics of Ceramics. Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-4019-6_34.

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Machado e Costa, Francisco, and Ana Cristina Braga. "Adjusting ROC Curve for Covariates with AROC R Package." In Computational Science and Its Applications – ICCSA 2020. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58808-3_15.

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Conference papers on the topic "R-curve"

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Miyachi, Kazuhiro, and Takashi Yajima. "Quantitative Evaluation of the Effect of Corrosion on the Fatigue Strength of High-Strength Galvanized Steel Wires." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.1606.

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&lt;p&gt;This study investigated the correlation between the ",rust color distribution rate", and ",fatigue strength", of high-strength galvanized steel wires used in cable-supported bridges. Corroded wires were prepared through accelerated corrosion test. The distribution of red rust affecting fatigue strength was quantified using digital image color analysis, revealing that the corroded wires had red rust rates of 27 ± 8% (R=27%) and 55 ± 8% (R=55%). Fatigue tests revealed that corrosion reduced the S-N curve slopes (m) from 4.3 to 4.2 (R=27%) and 3.8 (R=55%), corresponding to fatigue streng
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KOROTKIY, V. A., E. A. USMANOVA, and L. I. KHMAROVA. "CUBIC FERGUSON CURVE ON A PLANE." In GRAPHICON 2024. Omsk State Technical University, 2024. http://dx.doi.org/10.25206/978-5-8149-3873-2-2024-741-746.

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The paper proposes graph analytic algorithms for constructing a flat parameterized cubic curve passing through preset initial and end points R 1, R 2 with unit tangent vectors T1, T2 specified at these points. The tangent vectors and modules of the first vector derivatives w 1, w 2 at points R 1, R 2 are considered as control elements of the constructed curve shape. Incidence and tangency { R 1, R 2, T1, T2} conditions are supplemented by the condition of obtaining a preset curvature at the initial or end point of the curve. The paper solves two problems: 1) constructing the Ferguson curves wi
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Hojo, Kiminobu, Kazutoshi Ohoto, and Itaru Muroya. "J Resistance Curve Estimation of Inhomogeneous CT Specimen." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22047.

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In order to obtain the fracture toughness curve of inhomogeneous CT specimens, a simplified J-R curve estimation method has been proposed. To verify the applicability of this method, the fracture toughness test and the finite element analysis has been conducted. In overmatching case (mismatch ratio M = 2.2), the conventional ASTM standard’s J-R curve exceeded the J-R curve from the FE analysis in the plane strain condition by over 20%. On the other hand, the simplified J-R curve was located between J-R curves from the FE analyses in plane strain and plane stress condition. In undermatching cas
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Aram, Zainab, and Seyed Kamaledin Setarehdan. "R-R interval simulation based on power spectrum curve fitting." In 2013 20th Iranian Conference on Biomedical Engineering (ICBME). IEEE, 2013. http://dx.doi.org/10.1109/icbme.2013.6782206.

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Zhu, Xian-Kui, and Poh-Sang Lam. "Deformation Versus Modified J-Integral Resistance Curves for Ductile Materials." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78729.

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The J-integral resistance curve (or J-R curve) has been widely used as material property in fracture mechanics methods for structural integrity assessment. ASTM E1820 provides the standard fracture toughness test methods to measure JIc and J-R curves. The conventional J-R curve utilizes the J-integral parameter proposed by Rice [1] based on the deformation theory of plasticity. Due to crack-tip constraint effect, J-R curves of a material depend on specimen size, geometry type and crack length. In order to obtain size-independent resistance curves, Ernst [11] introduced a modified J-integral or
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Zhu, Xian-Kui, Tom McGaughy, Fabian Orth, and Jon Jennings. "Review of Low-Constraint Fracture Resistance Testing With SENT Specimens." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24281.

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Fracture resistance is an important material property and characterized by a J-integral resistance curve (J-R curve) or a crack-tip opening displacement (CTOD) resistance curve. ASTM standard specimens with deep cracks are subject to bending dominant forces, leading to high crack-tip constraint conditions and conservative fracture resistance curves. Actual cracks occurring in line pipes and welds are often shallow ones dominated by tensile forces, resulting in low constraint conditions. Shallow cracks have been shown to generate elevated fracture resistance curves in comparison to standard dee
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Tandon, Samarth, Ming Gao, Ravi Krishnamurthy, Richard Kania, and Gabriela Rosca. "Estimating J-R Curve From CVN Upper Shelf Energy and its Application." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64618.

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Accuracy in predictions of burst pressures for cracks in pipelines has significant impact on the pipeline integrity management decisions. One of the fracture mechanics models used for failure pressure prediction is API 579 Level 3 FAD ductile tearing instability analysis that requires J-R curves, i.e., crack resistance curves, for the assessment. However, J-R curves are usually unavailable for most pipelines. To overcome this technical barrier, efforts have been made to estimate the J-R curve indirectly from commonly available toughness data, such as the Charpy V-notched Impact Energy CVN valu
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Zhu, Xian-Kui, Sebastian Cravero, and Claudio Ruggieri. "Determination of J-R Curve for X60 Pipeline Steel Using SENT Specimens and Normalization Method." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78089.

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The normalization method is adopted in this paper to determine J-R curves for X60 pipeline steel using single-edge notched tension (SENT) specimens. A resistance curve procedure associated with the normalization method is developed to estimate crack extension, calculate crack growth corrected J-integral and generate a J-R curve directly using load-displacement data from a single test on SENT specimens. Based on experimental data for a typical pin-loaded SENT specimen, J-R curve for X60 pipeline steel is obtained by the normalization method and the conventional elastic unloading compliance meth
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Zhu, Xian-Kui, and Brian N. Leis. "Application of Constraint Corrected J-R Curves to Fracture Analysis of Pipelines." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71202.

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Fracture properties of API X80 pipeline steel have been developed using a set of single edge notched bend (SENB) and single edge notched tension (SENT) specimens with shallow and deep cracks to generate different crack-tip constraint levels. The test data show that the J-R curves for X80 pipeline steel are strongly constraint dependent. To facilitate transfer of the experimental J-R curves to those for actual cracked components, like flawed pipeline, constraint corrected J-R curves are developed. The two-parameter J-A2 formulation is adopted to quantify constraint effect on the crack-tip field
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Thorwald, Greg, and Ken Bagnoli. "Adjusted J-R Toughness Curve for Pipes Using J-A2 Crack Constraint of CT Specimens and 3D Crack Meshes." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93683.

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Abstract The objective of this paper is to use two-parameter fracture mechanics to adjust a material J-R resistance curve (i.e. toughness) from the test specimen geometry to the cracked component geometry. As most plant equipment is designed and operated on the “upper shelf”, a ductile tearing analysis may give a more realistic assessment of flaw tolerance. In most cases, tearing curves are derived from specimen geometries that ensure a high degree of constraint, e.g., SENB and CT Therefore, there can be significant benefit in accounting for constraint differences between the specimen geometry
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Reports on the topic "R-curve"

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Grutzik, Scott Joseph, Kevin Strong, and Steve Xunhu Dai. Investigation of R-Curve Behavior in Glass Ceramic Materials. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1568986.

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Mangin, Christophe. R-Curve Behavior for Silicon Carbide Whisker Reinforced Aluminum Oxide Composites. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada233958.

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Du, Han. Applied Longitudinal Data Analysis in R and SPSS. Instats Inc., 2024. http://dx.doi.org/10.61700/kdliyn5fqb7tr1173.

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Longitudinal data facilitates exploring intra-individual change over time and differences across people in these changes. This workshop equips participants with essential skills to analyze data and report results of longitudinal research effectively, with all worked exercises completed using R and SPSS. The workshop will explore techniques including multilevel modeling, latent growth curve models, cross-lagged models, longitudinal mediation models, longitudinal dyadic models, and other models.
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Clowers, Logan N., Alberto Esteban Linares, and Xiang Chen. Technical Manual for Automated J-R Curve Analysis Program Based on the ASTM E1820-18 Normalization Method. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1484983.

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Singh, J. P., C. Y. Chu, C. Murphy, and D. Singh. Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10185016.

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Shim, D. J., Gery Wilkowski, Mohammed Uddin, Sureshkumar Kalyanam, and P. Mincer. PR-276-094509-R01 Develop Fracture Initiation Criteria for High-Strength Steel Line Pipe Phase II. Pipeline Research Council International, Inc. (PRCI), 2013. http://dx.doi.org/10.55274/r0010072.

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This report summarizes the major findings from a PRCI Project on developing fracture initiation criteria for axial flaws (both through-wall and surface flaws) in high-strength line-pipe materials. This work was originally done on the basis to see if improvements were needed for higher-grade steels, but interestingly there were several outcomes that affect predictions for all piping steels. One of the outcomes of this work is a new correlation between Charpy USE and J-R curve for high-strength materials. Although it is based on limited data, it was demonstrated that there is significant differe
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Eason, E. D., and E. E. Nelson. Improved model for predicting J-R curves from charpy data: Final report. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6301451.

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Alwan, Iktimal, Dennis D. Spencer, and Rafeed Alkawadri. Comparison of Machine Learning Algorithms in Sensorimotor Functional Mapping. Progress in Neurobiology, 2023. http://dx.doi.org/10.60124/j.pneuro.2023.30.03.

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Objective: To compare the performance of popular machine learning algorithms (ML) in mapping the sensorimotor cortex (SM) and identifying the anterior lip of the central sulcus (CS). Methods: We evaluated support vector machines (SVMs), random forest (RF), decision trees (DT), single layer perceptron (SLP), and multilayer perceptron (MLP) against standard logistic regression (LR) to identify the SM cortex employing validated features from six-minute of NREM sleep icEEG data and applying standard common hyperparameters and 10-fold cross-validation. Each algorithm was tested using vetted feature
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Zyphur, Michael. Longitudinal SEM in R: Latent Growth and Cross-Lagged Panel Models. Instats Inc., 2022. http://dx.doi.org/10.61700/0cgexcmkbt2w4469.

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This seminar introduces longitudinal panel data models in Lavaan using SEM, including latent growth models (i.e., latent curve or latent trajectory models) and cross-lagged panel models (i.e., panel vector autoregression) with random and fixed effects, including the random intercept cross-lagged panel model (RI-CLPM) to assess time-varying and stable relationships. Short-run and long-run effects will be covered and methods for assessing them provided. An official Instats certificate of completion is provided at the conclusion of the seminar. For European PhD students, the seminar offers 2 ECTS
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Joyce, J., and E. Hackett. Extension and extrapolation of J-R curves and their application to the low upper shelf toughness issue. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5876140.

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