Structural phenomenon based theoretical model of concrete tensile behavior at different stress-strain conditions

2021 ◽  
Vol 33 ◽  
pp. 101594
Author(s):  
I. Iskhakov ◽  
Y. Ribakov
Keyword(s):  
Theoretical Model ◽  
Tensile Behavior ◽  
Stress Strain

Theoretical model for the study of the tensile behavior of FRCM reinforcements

2020 ◽  
Vol 236 ◽  
pp. 117617 ◽  
Author(s):  
Ernesto Grande ◽  
Gabriele Milani ◽  
Maura Imbimbo
Keyword(s):  
Theoretical Model ◽  
Tensile Behavior

A Model to Predict the Effect of Pre-Strain on the Fracture Toughness of Line Pipe Steel

2002 ◽  
Author(s):  
Andrew Cosham ◽  
Naoto Hagiwara ◽  
Naoki Fukuda ◽  
Tomoki Masuda
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Theoretical Model ◽  
Plastic Strain ◽  
Ductile Fracture ◽  
Experimental Studies ◽  
Uniaxial Tensile ◽  
Stress Strain ◽  
Line Pipe ◽  
Strained Material

New and existing pipelines can be subjected to high plastic strains. Denting a pipeline causes permanent plastic deformation. Onshore pipelines subject to subsidence, frost heave or earthquake loading can experience significant plastic strain during service. Offshore pipelines that are reeled prior to laying, or are laid in deep water, or are operating at high temperatures and high pressures, can experience significant plastic strain both prior to, and during, service. Experimental studies have indicated that pre-strain (permanent plastic deformation) has a detrimental effect on the fracture toughness of steel; it reduces the resistance to crack initiation, reduces the resistance to crack growth, and increases the transition temperature. Consequently, there is a need for a thorough understanding of the effect of pre-strain on the fracture toughness of line pipe. Accordingly, a theoretical model for predicting the effect of tensile pre-strain on the ductile fracture toughness has been developed using the local approach. The effect of pre-strain is expressed in terms of an equation for the ratio of the fracture toughness of the pre-strained material to that of the virgin (not pre-strained) material. The model indicates that the effect of tensile pre-strain on the material’s fracture toughness can be characterised in terms of the effect of pre-strain on the stress-strain characteristics of the material, the critical fracture strain for a stress state corresponding to that during pre-strain, and several parameters that relate to the conditions for ductile fracture (or cleavage fracture). The implications of the model are that it may be possible to estimate the reduction in toughness caused by pre-strain simply from a full stress-strain curve of the virgin material. The model has been validated against the results of crack tip opening displacement (CTOD) tests conducted by Tokyo Gas on two line pipe steels subject to uniaxial tensile pre-strain. It is shown that the predictions and trends of the theoretical model are in broad agreement with the test results.

CAD/CAE for stress–strain properties of multifilament twisted yarns

2016 ◽  
Vol 87 (6) ◽  
pp. 657-668 ◽  
Author(s):  
Keartisak Sriprateep ◽  
Erik LJ Bohez
Keyword(s):  
Computer Aided Design ◽  
Maximum Stress ◽  
Tensile Behavior ◽  
Assembly Model ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Filament Assembly ◽  
Computer Aided ◽  
Aided Design ◽  
Good Agreement

A method is presented for modeling the tensile behavior of multifilament twisted yarns. A filament assembly model and a computer-aided design/computer-aided engineering (CAD/CAE) approach are proposed for the tensile analysis. The geometry of the twisted yarn and the nonlinear filament properties were considered. The finite element method (FEM) and large deformation effects were applied for computation of the stress–extension curves. Ideal yarn structures of five layers with different twist angles were simulated to predict the tensile behavior of each filament and each layer. The stress acting on the filaments after yarn extension could be directly analyzed by the FEM. The stress distribution in the filaments showed that the highest stress regions were located at the filament in the center of the yarn and decreased slightly to the yarn surface. The stress–extensions of the filaments were converted to yarn tensile behavior that is shown in terms of the maximum and average stress–extension curves. The results of this prediction model were compared with the stress–strain curves of high-tenacity rayon yarn and the energy method. The maximum stress–extension curves showed very good agreement with experimental results and are more accurate than those obtained by previous methods.

scholarly journals Characterization and Modeling of Tensile Behavior of Ceramic Woven Fabric Composites

1991 ◽  
Author(s):  
Wen-Shyong Kuo ◽  
Wennei Y. Chen ◽  
Azar Parvizi-Majidi ◽  
Tsu-Wei Chou
Keyword(s):  
Tensile Behavior ◽  
Woven Fabric ◽  
Stress Strain ◽  
Closed Form Solutions ◽  
Transverse Cracking ◽  
Strain Relation ◽  
Stress Strain Relation ◽  
Fabric Composites ◽  
Fiber Bundle Model ◽  
Composite Stiffness

This paper examines the tensile behavior of SiC/SiC fabric composites. In the characterization effort, the stress-strain relation and damage evolution are studied with a series of loading and unloading tensile test experiments. The stress-strain relation is linear in response to the initial loading and becomes nonlinear when loading exceeds the proportional limit. Transverse cracking has been observed to be a dominant damage mode governing the nonlinear deformation. The damage is initiated at the inter-tow pores where fiber yarns cross over each other. In the modeling work, the analysis is based upon a fiber bundle model, in which fiber undulation in the warp and fill directions and gaps among fiber yarns have been taken into account. Two limiting cases of fabric stacking arrangements are studied. Closed form solutions are obtained for the composite stiffness and Poisson’s ratio. Transverse cracking in the composite is discussed by applying a constant failure strain criterion.

High-temperature constitutive model for three-dimensional needled C/C-SiC composite under tensile loading

2016 ◽  
Vol 51 (18) ◽  
pp. 2619-2629 ◽  
Author(s):  
Junbo Xie ◽  
Guodong Fang ◽  
Zhen Chen ◽  
Jun Liang
Keyword(s):  
High Temperature ◽  
Constitutive Model ◽  
Three Dimensional ◽  
Tensile Load ◽  
Tensile Loading ◽  
Testing Temperature ◽  
Tensile Behavior ◽  
Effect Of Temperature ◽  
Stress Strain ◽  
Nonlinear Stress

Tensile experiments of three-dimensional needled C/C-SiC composite from room temperature to 1800℃ were performed to investigate tensile behavior. The damage characteristics and macroscopic mechanical behavior of the composite are relevant to the testing temperature and off-axis angles of the tensile loading. The tensile strength increased while the modulus decreased with the increase of temperature. A high-temperature nonlinear constitutive model was established to analyze the nonlinear stress–strain relationship of the composite. Plastic strain accumulation and stiffness degeneration were described by the plasticity and damage theories. The effect of temperature on the tensile behavior of the composite was particularly considered in this model by introducing a thermal damage variable. The proposed constitutive model can predict the stress–strain behavior of the material subjected to different off-axis tensile load, and at different temperatures. Fairly good agreement was achieved between the predicted and experimental results.

Simulating the Mechanical Properties of a Yarn Based on the Properties and Arrangement of its Fibers Part II: Results of Simulations

1997 ◽  
Vol 67 (5) ◽  
pp. 342-347 ◽  
Author(s):  
Lieva Van Langenhove
Keyword(s):  
Mechanical Properties ◽  
Theoretical Model ◽  
Coefficient Of Friction ◽  
Stress Strain ◽  
Fiber Property ◽  
The Coefficient Of Friction ◽  
Predicted Values

Part I established a theoretical model that was able to predict the stress-strain and torque-strain curves of a yarn. This second part evaluates the model. The influence of fiber and yarn parameters on the predicted values is also discussed. The most critical fiber property is the coefficient of friction.

Simulating the Mechanical Properties of a Yarn Based on the Properties and Arrangement of its Fibers: Part III: Practical Measurements

1997 ◽  
Vol 67 (6) ◽  
pp. 406-412 ◽  
Author(s):  
Lieva Van Langenhove
Keyword(s):  
Mechanical Properties ◽  
Theoretical Model ◽  
Confidence Interval ◽  
Experimental Work ◽  
Stress Strain ◽  
Statistical Confidence ◽  
Input Parameters

Parts I and II explain and evaluate a theoretical model that can predict the stress-strain and torque-strain curves of a yarn. Part III discusses the results of the experimental work on input parameters, that is, properties and arrangement of the fibers in the yarn. When appropriate values are taken for fiber and yarn parameters, the predicted and measured values correspond within the statistical confidence interval.

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