The Damage Analysis of Usu Bridge under Static Load

2013 ◽  
Vol 671-674 ◽  
pp. 1064-1068
Author(s):  
Wei Gang Sun ◽  
Jian Hui Gao ◽  
Li Zhang
Keyword(s):  
Static Load ◽  
Damage Model ◽  
Main Beam ◽  
Damage Analysis ◽  
Finite Element Program ◽  
Extreme Wind ◽  
Element Program ◽  
Concrete Materials ◽  
Main Bridge

The Usu Bridge is single cable plane single tower cable-stayed bridge, the finite element program is used in this paper, the tensile、compression damage model of Concrete Materials is adopted, the damage of concrete structures of Usu main bridge under the combination of four kinds of static load is calculated, we get the damage distribution of the main tower and the main beam、the location of maximum damage and the effect of loading conditions, from which we find that the change of temperature has a greater impact on their damage and the role of the extreme wind has a greater impact on the main tower, thus we propose reasonable proposals on the construction and maintenance of the bridge.

Transferability of the Gurson Damage Model Parameters with Charpy and Tensile Tests with Different Constrain Level

2009 ◽  
Vol 65 ◽  
pp. 19-31
Author(s):  
Ruben Cuamatzi-Melendez ◽  
J.R. Yates
Keyword(s):  
Strain Rate ◽  
Damage Model ◽  
Rolling Direction ◽  
Fracture Initiation ◽  
Tensile Tests ◽  
Model Parameters ◽  
Gurson Model ◽  
Finite Element Program ◽  
Element Program ◽  
Gurson's Model

Little work has been published concerning the transferability of Gurson’s ductile damage model parameters in specimens tested at different strain rates and in the rolling direction of a Grade A ship plate steel. In order to investigate the transferability of the damage model parameters of Gurson’s model, tensile specimens with different constraint level and impact Charpy specimens were simulated to investigate the effect of the strain rate on the damage model parameters of Gurson model. The simulations were performed with the finite element program ABAQUS Explicit [1]. ABAQUS Explicit is ideally suited for the solution of complex nonlinear dynamic and quasi–static problems [2], especially those involving impact and other highly discontinuous events. ABAQUS Explicit supports not only stress–displacement analyses but also fully coupled transient dynamic temperature, displacement, acoustic and coupled acoustic–structural analyses. This makes the program very suitable for modelling fracture initiation and propagation. In ABAQUS Explicit, the element deletion technique is provided, so the damaged or dead elements are removed from the analysis once the failure criterion is locally reached. This simulates crack growth through the microstructure. It was found that the variation of the strain rate affects slightly the value of the damage model parameters of Gurson model.

The Response Analysis of Angle Tower Line System by Broken Lines

2015 ◽  
Vol 799-800 ◽  
pp. 1292-1294
Author(s):  
Li Qin ◽  
Wei Han ◽  
Wei Lin Peng
Keyword(s):  
Transmission Lines ◽  
System Model ◽  
Response Analysis ◽  
Design Specification ◽  
Finite Element Program ◽  
Line System ◽  
Element Program ◽  
Break Load ◽  
Tower System

The suddenly break makes the tension of tight lines rapid realease. The tower system will be subject to impact,but the design specification considers the break load only by static load.Beacuse of the angle between the sides of the transmission lines and the span changes, In order to solve this problem this paper uses the finite element program ANYSY/LS-DYNA to build tower and lines system model and analyse the dynamic response of corner tower system in role of lines breaking by the numerical simulation. The study has shown that the effect of the corner to the corer tower disconnected power respose can not be ignored.

A Material Model for Prediction of Fatigue Damage and Degradation of CFRP Materials

2017 ◽  
Vol 742 ◽  
pp. 740-744 ◽  
Author(s):  
Jörg Hohe ◽  
Monika Gall ◽  
Hannes Gauch ◽  
Sascha Fliegener ◽  
Zalkha Murni binti Abdul Hamid
Keyword(s):  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Material Model ◽  
Finite Element Program ◽  
Damage Evolution Equation ◽  
Brittle Damage ◽  
Linear Elastic ◽  
Element Program ◽  
Definition Of

Objective of the present study is the definition of a material model accounting for fatigue damage and degradation. The model is formulated as a brittle damage model in the otherwise linear elastic framework. A stress driven damage evolution equation is derived from microplasticity considerations. The model is implemented as a user-defined material model into a commercial finite element program. In a comparison with experimental data in the low cycle fatigue regime, a good agreement with the numerical prediction is obtained.

A MULTIPHASE ANALYSIS FOR ENVIRONMENTAL IMPACT ASSESSMENT WITH θ-STOCK FINITE ELEMENT PROGRAM

2010 ◽  
Vol 02 (01n02) ◽  
pp. 23-68 ◽  
Author(s):  
B. GATMIRI ◽  
S. HEMMATI ◽  
C. ARSON ◽  
E. AMIRZEHNI
Keyword(s):  
Finite Element ◽  
Thermal Loading ◽  
Damage Model ◽  
Degree Of Saturation ◽  
State Variables ◽  
Field Equations ◽  
Finite Element Program ◽  
Independent State ◽  
Brittle Rocks ◽  
Element Program

In the THM modeling of multiphase medium, the coupling effects of skeleton, suction, and temperature have been integrated via the concept of state surfaces of void ratio and degree of saturation. Based on proposed formulation, a fully coupled numerical model for the behavior of soil deformation, water flow, air flow, heat flow in unsaturated soil has been developed and integrated in a finite element code θ-Stock by the first author. This program is conceived with this idea that it will be able to analyze the response of a soil in different states of humidity to mechanical, thermal loading, and also damage phenomena. Damage model is dedicated to unsaturated brittle rocks. It mixes phenomenological and micromechanical concepts and is formulated based on the use of independent state variables. The expression of the liquid permeability is modified in order to represent the influence of fracturing on interstitial fluid flows. The final matrix form of established field equations of the proposed model for unsaturated case has been encoded for this particular purpose, in a finite element program which had been developed for dry and saturated soils previously.

scholarly journals Characteristics of Creep Damage for 60 Sn-40 Pb Solder Material

1999 ◽  
Vol 123 (3) ◽  
pp. 278-283 ◽  
Author(s):  
Y. Wei ◽  
C. L. Chow ◽  
H. E. Fang ◽  
M. K. Neilsen
Keyword(s):  
Damage Mechanics ◽  
Evolution Equations ◽  
Damage Model ◽  
Creep Damage ◽  
General Purpose ◽  
Tensile Creep ◽  
Finite Element Program ◽  
Solder Material ◽  
Phase Size ◽  
Element Program

This paper presents a viscoplasticity model taking into account the effects of change in grain or phase size and damage on the characterization of creep damage in 60 Sn-40 Pb solder. Based on the theory of damage mechanics, a two-scalar damage model is developed for isotropic materials by introducing the free energy equivalence principle. The damage evolution equations are derived in terms of the damage energy release rates. In addition, a failure criterion is developed based on the postulation that a material element is said to have ruptured when the equivalent damage accumulated in the element reaches a critical value. The damage coupled viscoplasticity model is discretized and coded in a general-purpose finite element program known as ABAQUS through its user-defined material subroutine UMAT. To illustrate the application of the model, several example cases are introduced to analyze, both numerically and experimentally, the tensile creep behaviors of the material at three stress levels. The model is then applied to predict the deformation of a notched specimen under monotonic tension at room temperature (22°C). The results demonstrate that the proposed model can successfully predict the viscoplastic behavior of the solder material.

scholarly journals Effect of Multi-Axial Stress State on the Deformation Path in Tube Flaring Process By Necking Instability Criteria

2021 ◽  
Author(s):  
Bruno Buchmayr ◽  
Alireza Omidvar
Keyword(s):  
Stress State ◽  
Axial Stress ◽  
Damage Model ◽  
Biaxial Stress ◽  
Finite Element Program ◽  
Damage Models ◽  
Biaxial Stress State ◽  
Conical Die ◽  
Tube Flaring ◽  
Element Program

Abstract Various parts for automotive, appliance and oil industry are pro- duced from tubes that are assembled and welded. For gaining the best weight savings, durability and cost reasons (energy saving, production cost, etc) the formability of the tubular materials is very important. The overall success of deformation process heavily depends on the incoming tubular material proper- ties. In this work, formability of tubular steels is experimentally characterized and with the development of a numerical model the effect of biaxial stress state has been investigated. An experimental method has been developed to characterize the importance of multi-axial stress state on the formability of tubes. This requires the deformation in form of flaring of the tubular samples through a conical die. Damage strains are determined with the help of Hill-Swift Sheet Metal Forming Criteria and a plot of main strains occurring during the tube flaring test, after variation of the die-angle and friction coefficient has been resulted. Experimental results were then entered into the damage models of finite element program DEFORMTM-PC PRO and used to calibrate the damage model for formability so that a sizable variation of range of multiaxial state of stress could be produced. The results showed that with increasing the stress multiaxiality of tubular steels, the damage strain was reduced. This indicates that the proposed method could be used of benefit in quality control in the production of tubes specially in the monitoring and controlling of tubes production such as tube rolling, welding and annealing.

Investigation on Opening Sizes and Influencing Factors of the Connection with Opening on Beam Web of Steel Frames

2014 ◽  
Vol 8 (1) ◽  
pp. 9-13
Author(s):  
Li Bin
Keyword(s):  
Finite Element ◽  
Theoretical Basis ◽  
Static Load ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Engineering Practice ◽  
Static Loads ◽  
Finite Element Program ◽  
Element Program ◽  
The Web

The connection with opening on beam web is analyzed by Finite Element Program ABAQOUS. The optimal opening sizes and location are determined under the static loads. The factors to influence the formation of plastic hinge in beams and columns withstand static load are considered. Conclusions are drawn that the formation position is not only related with the web height h, but also with flange width b. The result provides us with a theoretical basis for specific engineering practice.

Space Stability Analysis of Inclined Thin-Walled Steel Box Ribs

2014 ◽  
Vol 578-579 ◽  
pp. 954-959
Author(s):  
Hua Jun Ma ◽  
Xin Chong Chen
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Buckling Analysis ◽  
Finite Element Program ◽  
Stability Performance ◽  
Out Of Plane ◽  
Calculation Results ◽  
Element Program ◽  
Thin Walled ◽  
Main Bridge

Main bridge of Nanning Bridge is taken as Research Object. Using the finite element program ANSYS, space finite element model of an arch bridge with two inclined thin-walled steel box ribs is build, stability safety factor of the bridge is calculated, eigenvalue buckling analysis and non-linear buckling analysis of inclined thin-walled ribs are carried out, and stability performance is discussed. The result shows that stability problems of this bridge mainly occur on the ribs and are out-of-plane buckling in general, and horizontal loads have greater influences on out-of-plane buckling. The calculation results can provide parameters for construction, health detection and maintenance in the operational phase of the bridge.

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