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Author: S. Aihara Publisher: ISBN: Category : Cleavage fracture Languages : en Pages : 17
Book Description
Incorporation of micromechanistic criteria of failure to analytical or numerical crack tip stress and strain solutions, known as the RKR (Ritchie, Knott, and Rice) model, derives a certain relation between the fracture toughness and flow/fracture properties of materials. Based on the above analytical prediction, correlations between the fracture toughness and yield stress, cleavage fracture stress, and critical plastic strain of the materials have been investigated for cleavage and ductile fracture. Nine types of low carbon structural steel were tested that had various microstructures with yield strengths of 280 to 1110 MPa. Good correlations according to analytical predictions have been obtained for both cleavage and ductile fracture, and the possibility of quantitative prediction of the fracture toughness from a conventional round bar tensile test can be shown. Effects of metallurgical and mechanical factors on the fracture toughness, and temperature dependence of the fracture toughness, can be explained from their effects on the flow and fracture properties.
Author: S. Aihara Publisher: ISBN: Category : Cleavage fracture Languages : en Pages : 17
Book Description
Incorporation of micromechanistic criteria of failure to analytical or numerical crack tip stress and strain solutions, known as the RKR (Ritchie, Knott, and Rice) model, derives a certain relation between the fracture toughness and flow/fracture properties of materials. Based on the above analytical prediction, correlations between the fracture toughness and yield stress, cleavage fracture stress, and critical plastic strain of the materials have been investigated for cleavage and ductile fracture. Nine types of low carbon structural steel were tested that had various microstructures with yield strengths of 280 to 1110 MPa. Good correlations according to analytical predictions have been obtained for both cleavage and ductile fracture, and the possibility of quantitative prediction of the fracture toughness from a conventional round bar tensile test can be shown. Effects of metallurgical and mechanical factors on the fracture toughness, and temperature dependence of the fracture toughness, can be explained from their effects on the flow and fracture properties.
Author: J. P. Gudas Publisher: ASTM International ISBN: 0803112998 Category : Fracture mechanics Languages : en Pages : 615
Book Description
Papers from the 21st National Symposium on Fracture Mechanics, held in Annapolis, Md., June 1988, present new work in elastic-plastic fracture, dynamic fracture, transition fracture in steels, micromechanical aspects of the fracture process, computational mechanics, fracture mechanics testing, and a
Author: T. Ochiai Publisher: ISBN: Category : Brittle fracture Languages : en Pages : 34
Book Description
Fracture toughness properties of structural steels of 490-MPa strength class and weld metals under dynamic loading are studied in the light of the near crack tip stress fields. The loading rate in toughness tests range from 0.1 to 500 mm/s. The near-tip stress fields are analyzed by 3D-FEM considering the strain rate effect on the flow properties of materials. Temperature rise caused by high-speed plastic deformation is also included in the FE analysis. The critical CTOD at brittle fracture initiation decreases when increasing the loading rate. This is due to the elevation of a local stress near the crack tip. The local approach is applied to the dynamic fracture toughness evaluation. It is shown that the brittle fracture resistance evaluated in terms of the Weibull stress, an integrated stress over a highly stressed region near the crack tip, is a material property independent of the loading rate. Based on the Weibull stress fracture criterion, the dynamic fracture toughness can be predicted from static toughness results. An engineering procedure to estimate the loading rate effect on the fracture toughness is also presented.
Author: V. G. DeGiorgi Publisher: ISBN: Category : Languages : en Pages : 22
Book Description
Initiation of crack growth in ductile materials has long been a concern to the manufacturing and design community. The current analysis considers a definition of fracture at the continuum scale to determine the onset of fracture. The strain energy density associated with fracture at the continuum scale is used as the fracture criterion. The critical strain energy density and the scale invariant continuum stress-strain curve were determined from a hybrid computational-experimental analysis of the deformation of a series of tensile tests performed on cylindrical specimens of HY-100 steel. Computational simulation of fracture initiation in a compact specimen of HY-100 steel containing a crack was performed using two- and three-dimensional nonlinear finite element techniques and continuum toughness concepts. Predicted values of classical fracture toughness parameters are within 3.5 percent of experimentally determined values. Fracture, Strain energy, Damage criteria. (jes).
Author: S. Carassou Publisher: ISBN: Category : C-Mn steel Languages : en Pages : 10
Book Description
Fracture toughness testing of irradiated or aged materials is often limited due to the lack of available material. Subsize Charpy, small CT specimens or small punch test is generally used to overcome this limitation. In this paper, a method based on small notched tensile specimen testing is presented and used for evaluation of fracture toughness properties of a C-Mn steel with a large inclusions content. Specimens are cut in the radial and circumferential directions from a C-Mn steel pipe and tested at 100°C. The diameter of the smallest specimens is 3.6 mm. The average strain at fracture and finite elements simulation of the notched specimens are used to determine the critical values of a local ductile fracture criterion. These values are subsequently used in conjunction with finite element simulations to predict the fracture toughness of the material in different orientations. The predictions are compared with fracture toughness measured on 1⁄2 T, 1 T and 2 T-CT specimens.
Author: V. G. DeGiorgi Publisher: ISBN: Category : Languages : en Pages : 51
Book Description
Computational simulation of stable crack growth is an important aspect of structural integrity prediction. Modern alloy strength and ductility increase local material fracture toughness but simultaneously complicates stable crack growth predictions. Material modeling, material parameter identification, fracture criterion and numerical crack growth algorithms are issues which must be addressed for robust stable crack growth prediction. In this investigation, a series of finite element simulations were undertaken to investigate two-dimensional Mode I crack growth in a modified compact tension specimen geometry. Two different crack lengths were considered. HY-100 steel parameters, previously characterized for large strain deformation, were utilized. Additional material responses, based on the HY-100 nonlinear response but with different yield strengths and ductilities, were also considered to parametrically assess material effects on crack growth. (JES).
Author: E.E. Gdoutos Publisher: Springer Science & Business Media ISBN: 9400919565 Category : Science Languages : en Pages : 326
Book Description
It is difficult to do justice to fracture mechanics in a textbook, for the subject encompasses so many disciplines. A general survey of the field would serve no purpose other than give a collection of references. The present book by Professor E. E. Gdoutos is refreshing because it does not fall into the esoteric tradition of outlining equations and results. Basic ideas and underlying principles are clearly explained as to how they are used in application. The presentations are concise and each topic can be understood by advanced undergraduates in material science and continuum mechanics. The book is highly recommended not only as a text in fracture mechanics but also as a reference to those interested in the general aspects of failure analysis. In addition to providing an in-depth review of the analytical methods for evaluating the fundamental quantities used in linear elastic fracture mechanics, various criteria are discussed re:O. ecting their limitations and applications. Par ticular emphases are given to predicting crack initiation, subcritical growth and the onset of rapid fracture from a single criterion. Those models in which it is assumed that the crack extends from tip to tip rely on the specific surface energy concept. The differences in the global and energy states before and after crack extension were associated with the energy required to create a unit area of crack surface. Applications were limited by the requirement of self-similar crack growth.
Author: S. Aihara
Author: S. Aihara
Author: J. P. Gudas
Author: 
Author: 
Author: T. Ochiai
Author: V. G. DeGiorgi
Author: S. Carassou
Author: V. G. DeGiorgi
Author: 
Author: E.E. Gdoutos