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Articles 1 - 7 of 7
Full-Text Articles in Mechanical Engineering
A Cell Model For Ductile Fracture With Applications, C. Fong Shih, Li Cheng, J. Faleskog, Xiaosheng Gao
A Cell Model For Ductile Fracture With Applications, C. Fong Shih, Li Cheng, J. Faleskog, Xiaosheng Gao
Dr. Xiaosheng Gao
No abstract provided.
Analysis Of Ductile To Cleavage Transition In Part-Through Cracks Using The Cell Model Incorporating Statistics, Xiaosheng Gao, J. Faleskog, C. Fong Shih
Analysis Of Ductile To Cleavage Transition In Part-Through Cracks Using The Cell Model Incorporating Statistics, Xiaosheng Gao, J. Faleskog, C. Fong Shih
Dr. Xiaosheng Gao
This paper describes an approach to study ductile/cleavage transition in ferritic steels using the methodology of a cell model for ductile tearing incorporating weakest link statistics. The model takes into account the constraint effects and puts no restriction on the extent of plastic deformation or amount of ductile tearing preceding cleavage failure. The parameters associated with the statistical model are calibrated using experimental cleavage fracture toughness data, and the effect of threshold stress on predicted cleavage fracture probability is investigated. The issue of two approaches to compute Weibull stress, the ‘history approach’ and the ‘current approach’, is also addressed. The …
A Mechanism-Based Approach For Predicting Ductile Fracture Of Metallic Alloys, Xiaosheng Gao
A Mechanism-Based Approach For Predicting Ductile Fracture Of Metallic Alloys, Xiaosheng Gao
Dr. Xiaosheng Gao
Ductile fracture in metallic alloys often follows a multi-step failure process involving void nucleation, growth and coalescence. Because of the difference in orders of magnitude between the size of the finite element needed to resolve the microscopic details and the size of the engineering structures, homogenized material models, which exhibits strain softening, are often used to simulate the crack propagation process. Various forms of porous plasticity models have been developed for this purpose. Calibration of these models requires the predicted macroscopic stress-strain response and void growth behavior of the representative material volume to match the results obtained from detailed finite …
Enabling And Understanding Failure Of Engineering Structures Using The Technique Of Cohesive Elements, H. Jiang, Xiaosheng Gao, T. S. Srivatsan
Enabling And Understanding Failure Of Engineering Structures Using The Technique Of Cohesive Elements, H. Jiang, Xiaosheng Gao, T. S. Srivatsan
Dr. Xiaosheng Gao
In this paper, we describe a cohesive zone model for the prediction of failure of engineering solids and/or structures. A damage evolution law is incorporated into a three-dimensional, exponential cohesive law to account for material degradation under the influence of cyclic loading. This cohesive zone model is implemented in the finite element software ABAQUS through a user defined subroutine. The irreversibility of the cohesive zone model is first verified and subsequently applied for studying cyclic crack growth in specimens experiencing different modes of fracture and/or failure. The crack growth behavior to include both crack initiation and crack propagation becomes a …
Numerical Modeling Of The Constraint Effects On Cleavage Fracture Toughness, Sunil Prakash, Xiaosheng Gao, T. S. Srivatsan
Numerical Modeling Of The Constraint Effects On Cleavage Fracture Toughness, Sunil Prakash, Xiaosheng Gao, T. S. Srivatsan
Dr. Xiaosheng Gao
Cleavage fracture has been an important subject for engineers primarily because of its catastrophic nature and consequences. Experimental studies of cleavage fracture did reveal a considerable amount of scatter and provided evidence of noticeable constraint effects. This did provide the motivation for the development of statistical-based and micromechanics-based methods in order to both study and analyze the problem. The Weibull stress model, which is based on the weakest link statistics, uses two parameters (m and σ u) to effectively describe the inherent distribution of the micro-scale cracks once plastic deformation has occurred and to concurrently define the relationship between the …
Analysis Of Loading Rate Effects On Cleavage Fracture Toughness Of Ferritic Steels, Xiaosheng Gao, Robert H. Dodds Jr.
Analysis Of Loading Rate Effects On Cleavage Fracture Toughness Of Ferritic Steels, Xiaosheng Gao, Robert H. Dodds Jr.
Dr. Xiaosheng Gao
No abstract provided.
The Third-Type Of Strain Aging And The Constitutive Modeling Of A Q235b Steel Over A Wide Range Of Temperatures And Strain Rates, Jianjun Wan, Wei-Guo Guo, Xiaosheng Gao, Jing Su
The Third-Type Of Strain Aging And The Constitutive Modeling Of A Q235b Steel Over A Wide Range Of Temperatures And Strain Rates, Jianjun Wan, Wei-Guo Guo, Xiaosheng Gao, Jing Su
Dr. Xiaosheng Gao
In this study, uniaxial compression experiments of a Q235B steel are conducted over the temperature range of 93–1173 K and the strain rate range of 0.001–7000 s−1. Through the mechanism analysis, an argument is made that the third-type of strain aging (the 3rd SA) effect, the Portevin–Le Chatelier (PLC) effect and the blue brittleness are different manifestations of the dynamic strain aging. Based on the experiment results, the characteristics of the 3rd SA effect are analyzed and a constitutive model is developed to describe the plastic behavior of the Q235B steel. The model accounts for the 3rd SA effect and …