3 edition of Three-dimensional measurements of fatigue crack closure found in the catalog.
Three-dimensional measurements of fatigue crack closure
|Statement||by S.K. Ray and A.F. Grandt, Jr.|
|Series||NASA-CR -- 173679., NASA contractor report -- NASA CR-173679.|
|Contributions||Grandt, A. F. 1945-, United States. National Aeronautics and Space Administration., Purdue University. School of Aeronautics and Astronautics.|
|The Physical Object|
Oct 02, · The study of fatigue is of major engineering importance because cracks occur more frequently than expected. The goal of this research is to be able to better predict fatigue crack growth (FCG) in Aluminum Alloy. Being able to accurately Cited by: 2. The effect of underloads is mostly quantified by the averaged effect on the fatigue crack growth rate, and the transient behavior is rarely investigated. The objective of this paper is to study the mechanisms behind the effect of underloads, periodic underloads, and underloads combined with blogorazzia.com: Fernando V. Antunes, Luís Paiva, Ricardo Branco, Luís P. Borrego.
Modeling of Three-Dimensional Effects on Fatigue Crack Closure Processes in Small-Scale Yielding View Section, 2. Fractographic Reassessment of the Significance of Fatigue Crack Closure. It has been used to explain the effects of stress ratio, 6 overloads, 7 short cracks 8 and specimen thickness. 9, 10 Crack closure has been determined using experimental, numerical or analytical approaches. 11 The T‐stress is another concept which has been used to explain the effect of specimen geometry. 12 The concept of partial crack Cited by:
The Hardcover of the Fracture Mechanics by Ted L. Anderson, T. L. Anderson | at Barnes & Noble. FREE Shipping on $35 or more! Expanded and updated coverage of crack closure and variable-amplitude fatigue Updated solutions manual. Closure Measurements Recently, S. Beretta been devoting also to other two fields of research: i) the application of DIC to the analysis of fatigue damage in TiAl alloys and the accurate measurements of crack closure in different conditions (HCF and LCF); ii) the fatigue of AM materials. The latter will be the topic of his lecture. Jean-Yves Buffière (France).
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Get this from a library. Three-dimensional measurements of fatigue crack closure. [S K Ray; A F Grandt; United States. National Aeronautics and Space Administration.; Purdue University.
School of Aeronautics and Astronautics.]. Get this from a library. Three-dimensional measurements of fatigue crack closure: semi-annual status report. [A F Grandt; Purdue University. School of Aeronautics and Astronautics.; United States. National Aeronautics and Space Administration.]. Fatigue crack closure has been studied by means of the finite element method for a long time.
Most work has been performed considering bi-dimensional models where the numerical methodology has. A comparison of two and three-dimensional analyses of fatigue crack closure. Plasticity-induced fatigue crack closure is an important mechanism in the reduction of the effective stress intensity factor range for a fatigue crack.
A calculation of the level of reduction would allow more accurate predictions of fatigue crack growth rate Cited by: Different methods of closure measurement and issues related to the identification of closure points are examined.
Based on compliance curves obtained from crack mouth clip gauges and near-tip strain gauges, a systematic assessment of closure measurements has been made by a variety of non-subjective blogorazzia.com by: Also considered are a statistical approach to crack closure determination, the crack closure behavior of surface cracks under pure bending, closure measurements on short fatigue cracks, and crack.
Open Library is an initiative of the Internet Archive, a (c)(3) non-profit, building a digital library of Internet sites and other cultural artifacts in digital blogorazzia.com projects include the Wayback Machine, blogorazzia.com and blogorazzia.com Fatigue Crack Plastic Zone Crack Growth Rate Fatigue Crack Growth Crack Closure These keywords were added by machine and not by the authors.
This process is experimental and the keywords may be updated as the learning algorithm improves. ANALYSES OF FATIGUE CRACK GROWTH AND CLOSURE NEAR THRESHOLD CONDITIONS FOR LARGE-CRACK BEHAVIOR J.
Newman, Jr. NASA Langley Research Center Hampton, Virginia USA ABSTRACT A plasticity-induced crack-closure model was used to study fatigue crack growth and closure in thin T3 aluminum alloy under constant-R and constant-Kmax threshold. In this work, a brief background for both the two-dimensional and the three-dimensional image correlation methods is provided.
Results from two projects, one using 2-D image correlation for crack closure measurements during fatigue and another using 3-D image correlation to measure surface deformations in large cracked panels, are blogorazzia.com by: 9. May 19, · Three Dimensional Simulation of Near-Threshold Fatigue Crack Growth for the K-Decreasing Test Method Banavara R.
Seshadri National Institute of Aerospace Stephen W. Smith NASA Langley Research Center John A. Newman NASA Langley Research Center Richard G.
Pettit FractureLab E08 Fatigue and Fracture Committee Meeting May 19Anaheim, CA. The effects of simple load excursions on fatigue crack growth and crack closure measurements in aluminum alloy T are presented.
The crack closure loads were measured local to the crack tip in 6-mm and mm-thick specimens, using an Elbert type gage for measuring crack-tip opening.
An elastic-plastic finite element model and high resolution experimental measurements of growing fatigue cracks are employed in partnership to investigate the relationship between crack closure, near-tip deformation behavior, and remote load-displacement measurements.
The model focuses on plasticity. The crack closure phenomenon has attracted great attention in the prediction of fatigue crack growth. The finite element analysis of fatigue crack growth has been conducted by many researchers mainly emphasized on the technique implementation of the simulation.
In this paper the behavior of plasticity induced fatigue crack closure was analyzed by the elastic-plastic finite element method for Cited by: 2. “Three-Dimensional Measurements of Fatigue Crack Opening and Closure,” Basic Questions in Fatigue: Volume II, ASTM STPR.P.
Wei and R.P. Gangloff, eds., American Society for Testing and Materials, (with S.K. Ray and A.F. Grandt). Books. Investigation of fatigue crack closure using multiscale image correlation experiments J. Carrolla, C. Efstathioua, Adding to the ambiguity is the fact that crack closure is three-dimensional in nature because of constraint condition vari- gued that surface crack closure measurements at the crack tip overestimate the crack closure blogorazzia.com by: Failure analysis and fatigue life prediction are necessary and critical for engineering structural materials.
In this paper, a general methodology is proposed to predict fatigue life of smooth and circular-hole specimens, in which the crack closure model and equivalent initial flaw size (EIFS) concept are employed. Different effects of crack closure on small crack growth region and long crack Cited by: 7.
Although details of the mechanisms of crack closure and their implications to fatigue crack growth have remained controversial since Elber’s definition, this topic has been the focus of considerable experimental and theoretical research over the last four blogorazzia.com: A Varvani-Farahani, D L Chen.
STP Mechanics of Fatigue Crack Closure J. Newman, Jr. and Wolf Elber, editors # ASTM Closure Measurements on Short Fatigue Cracks—JOO-JIN LEE AND WILLIAM N.
SHARPE, JR. Three-Dimensional Aspects of Fatigue Crack Closure in Surface Flaws in. Mar 01, · Read "Crack growth and closure behaviour of surface cracks under pure bending loading, International Journal of Fatigue" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
In the fatigue growth simulation of the type 2 test, crack closure was predicted when the crack was small through a negative value of KImin. As the crack grew longer, KImin became positive and the crack opened. If closure free material data were used, then a conservative numerical fatigue life was obtained.P-texture effect on the fatigue crack propagation (FCP) resistance in an Al-Cu-Mg alloy containing a small amount of Ag, is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron back scattering diffraction (EBSD).Cited by: 2.A Unified Elastic-Plastic Model for Fatigue Crack Growth at Notches Including Crack Closure Effects an algorithm for the description of the crack opening and closure behavior and approximation formulas were developed for the as well as the complete concept, were verified by experiments and two- and three-dimensional elastic and elastic Cited by: 6.