Inelastic Deformation and Fatigue Damage of Composite under Multiaxial Loading

1991 ◽  
pp. 675-694 ◽  
Author(s):  
S. Murakami ◽  
Y. Kanagawa ◽  
T. Ishida ◽  
E. Tsushima
Keyword(s):  
Fatigue Damage ◽  
Inelastic Deformation ◽  
Multiaxial Loading

A stress invariant based criterion to estimate fatigue damage under multiaxial loading

2008 ◽  
Vol 30 (9) ◽  
pp. 1646-1658 ◽  
Author(s):  
A CRISTOFORI ◽  
L SUSMEL ◽  
R TOVO
Keyword(s):  
Fatigue Damage ◽  
Multiaxial Loading ◽  
Stress Invariant

scholarly journals Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the Model formulation of Concrete based on Strain Life Approach

2019 ◽  
Author(s):  
Indra Yadav ◽  
Kamal Bahadur Thapa
Keyword(s):  
Fatigue Damage ◽  
Residual Strain ◽  
Inelastic Deformation ◽  
Evaluation Model ◽  
Strain Curve ◽  
Fatigue Loading ◽  
Vital Role ◽  
Evolution Model ◽  
Stiffness Degradation ◽  
The Impact

Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the modeling of concrete plays a vital role in the evolution material behaviour which is heterogeneous and anisotropic in nature. In this paper, the Level-S nonlinear fatigue strain curve, fatigue modulus curve, residual strain curve of concrete in compression, tension, flexure and torsional fatigue loading were proposed using strain life approach. The parameters such as physical meaning, the ranges, and the impact on the shape of the curve were discussed. Then, the evolution model of fatigue modulus was established based on the fatigue strain evolution model, fatigue modulus evaluation model, residual strain evaluation model, secondary strain evaluation model. The hypothesis of fatigue modulus is inversely related with the fatigue strain amplitude. The fatigue evolution of concrete damages the bond between material grains, changed the orientation of structure of molecules and affects the elastic properties resulting in the reduction of material stiffness and modulus by utilizing strain life analysis, regarding stiffness degradation and inelastic deformation by formation of microcracking, macro cracking, cracking which is heterogeneous and anisotropic in nature . This paper presents the Fatigue Strain Life Model and analyses of fatigue strain, fatigue modulus and damage parameters of concrete which is capable of predicting stiffness degradation, inelastic deformation, strength reduction under fatigue loading. Hence, the obtainable results were compared with experimental results for the validation of the proposed model.

scholarly journals Strain based approach in fatigue damage modeling of brittle material-application to concrete

2019 ◽  
Vol 2 (1) ◽  
pp. 49-60
Author(s):  
Indra Narayan Yadav
Keyword(s):  
Fatigue Damage ◽  
Brittle Material ◽  
Inelastic Deformation ◽  
Damage Mechanics ◽  
Fatigue Loading ◽  
Biaxial Stress ◽  
Stiffness Degradation ◽  
Experimental Result ◽  
Variable Theory ◽  
Strain Space

Due to very good compressive strength of concrete, it is used widely in all over the world during three decades. The Formulation of Concrete is through combination of Cement, stone aggregate, sand and water according to their design mix based on the ultimate strength required for the structural component. The Mixing of concrete is as mortar, the layer of cement, sand and water is wrapped around the aggregate. When the load is applied to the concrete, the weaker zone i.e. mortar of cement, sand is weaker than stone aggregate, damage by formulation of crack before crack in aggregate. The Damage behavior of Concrete is thus to be analyzed according to their fatigue behavior. Strain Based approach in Fatigue Damage Modelling of Brittle Material in Concrete is presented to describe the behavior and failure of con-crete by utilizing Damage Mechanics approach. Stiffness degradation and inelastic deformation are the essential features of concrete that develop due tothe formation of multitude of microcracks in the fatigue environment. Microcracking, which is anisotropic in nature, destroys the bond between material grains, and affects the elastic properties resulting in the reduction of material stiffness in elastic as well as plastic stage. This paper presents an anisotropic fatigue damage model for plain concrete subjected to cyclic tension. The model is developed, in strain space, using the general framework of internal variable theory of continuum thermodynamics and Damage Mechanics. It is argued that within the damage surface of given strain states the unloadingreloading cycles (fatigue loading) stimulate the nucleation and growth microcracks in concrete, which will result in stiffness degradation and inelastic deformation, and hence material is termed as damaged. Damage is reflected through the fourthorder stiffness tensor involving a damage parameter whose increment is governed by the consistency equation associated with a cycle dependent damage surface in strain space. The model is capable of predicting stiffness degradation, inelastic deformation and strength reduction under fatigue loading and compared against experimental result. By increasing the number of loading cycles, the strength of concrete gradually decreases and the limit surface is allowed to contract and form new curves representing residual strengths. The magnitude of loading, load range, and the load path are known to influence the fatigue life and hence are addressed in this formulation. In this paper, a strength softening function is proposed in order to address the re-duction in the strength of concrete due to fatigue. Separate softening functions are also proposed to account for the deformation characteristics in concrete under cyclic loading. Numerical simula-tions predicted by the model in both uniaxial and biaxial stress paths show a good correlation with the experimental data available in the literature.

scholarly journals Fatigue damage assessment of particle-reinforced metal matrix composite materials under uniaxial & multiaxial loading conditions

2021 ◽  
Author(s):  
Christopher E Sutton
Keyword(s):  
Composite Materials ◽  
Metal Matrix Composite ◽  
Fatigue Damage ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Damage Assessment ◽  
Multiaxial Loading ◽  
Loading Conditions

Fatigue damage assessment of particle-reinforced metal matrix composite materials under uniaxial & multiaxial loading conditions

Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*

2006 ◽  
Vol 48 (3) ◽  
pp. 80-84
Author(s):  
Klemens Rother ◽  
Tomas Nicak ◽  
Eckart Weiß ◽  
Jürgen Rudolph ◽  
Benedikt Postberg
Keyword(s):  
Fatigue Damage ◽  
Multiaxial Loading ◽  
Weld Seams
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