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HomeFracture/Failure Simulation of cohesive fatigue in Abaqus with subroutine
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Simulation of cohesive fatigue in Abaqus with subroutine

€ 280

In this training package, cohesive fatigue based on Khoramishad’s model has been implemented in the USDFLD subroutine and used on a single joint connection

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Description

Simulation of cohesive fatigue in Abaqus with subroutine

Since the fatigue of cohesive is not presented as an option in the Abaqus software, it is necessary to write a subroutine to implement this behavior. In this training package, cohesive fatigue based on Khoramishad’s model has been implemented in the VUSDFLD subroutine and used on a single joint connection. Finally, the subroutine is written line-by-line and implemented on the model.FLD subroutine.

It should be mentioned the cohesive damage, as well as the damage’s progression, are both well explained. It is notable that we also considered increasing damage and applied the Benzeggagh-Kenane Fracture Criterion connection.

In this model, a reliable numerical damage model has been developed for bonded joints under a fatigue load that depends only on the adhesive system and not on the joint configuration. A bilinear tensile-separation description of a cohesive zone model was used to simulate progressive damage in bonded joints. Additionally, a strain-based fatigue damage model was integrated with the cohesive zone model to simulate the deleterious influence of fatigue loading on bonded joints. To obtain the parameters of the damage model and validate the methodology, carefully planned experimental tests on coupons cut from a bonded panel and separately fabricated single lap joints were undertaken.

 

Lesson-1: Theory of cohesive fatigue based on article

  • Where can we use cohesive behavior? Different methods to simulate cohesive behavior. Limitations to simulate cohesive behavior in different methods Traction-separation formula for cohesive behavior Damage initiation criteria for cohesive in traction-separation law Criteria of progressive damage behavior in cohesive materials Usage Limitation of element-based cohesive modeling Element based method for cohesive material in continuum element Element based method for cohesive material in traction-separation law Settings for initial thickness of cohesive with traction-separation law Different types of cohesive elements Outputs for cohesive element Viscous regulation for cohesive element Usage limitation of surface-based method for cohesive modeling Element-based method vs surface-based method
  • Workshop 1: Simulation Single Lap joint under tension Problem description How to define traction-separation elastic behavior for cohesive elements What is the procedure to model cohesive via element based method How to define damage initiation based on QUADS damage How to apply initial thickness settings How to assemble cohesive parts and other parts How to define outputs for cohesive elements Settings in different module for cohesive behavior definition Cohesive element settings in mesh module How to see the result of damage initiation for cohesive materials Plot damage initiation criterion vs time for critical element Plot damage parameter vs time for critical element Plot stress vs strain for critical element
  • Workshop 2: Simulation of masonry wall in Abaqus Problem Description Settings to solve convergence problem in implicit solver Settings to remove element in visualization module Suitable method to simulate cohesive behavior between bricks and masonry wall Suitable method to simulate cohesive behavior between bricks and masonry wall How to define Concrete damage plasticity behavior(CDP) Using mass scale to increase simulation speed Output settings for cohesive surface behavior Settings to define cohesive behavior via surface-based method in explicit solver How to apply pressure when equivalent force in known
  • Workshop 3: Debonding behavior of a double cantilever beam Problem description Settings to define cohesive behavior via surface-based method in implicit solver Plot force vs displacement in debonding of DCB(double cantilever beam) How to model damage initiation and progressive damage for cohesive in surface-based method

Lesson-2: Writing subroutine for cohesive fatigue

  • Providing equation of elastic behavior of adhesive materials
  • Providing the damage initiation and progressive damage equations of adhesive materials based on energy criteria
  • Subroutine explanation line by line
  • subroutine Implementation in simple joint
  • Validation of the results by comparison with Abaqus simulation

Workshop: Cohesive Fatigue analysis of two AL specimens in the adhesive single lap joint

  • Problem description
  • Input for subrouitne in Abaqus GUI
  • How to create fatigue cycles in each step in GUI?
  • Discussion about results
  • How to omit damaged cohesive element in a single lap joint?
Additional information
Included

.cae, .inp, .jnl, .odb

Tutorial video duration

+1000 Minutes

language

English

Level

Intermediate

Package Type

Package For Professionals

Software version

Applicable to all versions

Subtitle

English

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SKU: AA6805-1-1 Categories: Civil Engineering, Cohesive, Fatigue, Fracture/Failure, Mechanical Enginerring, Subroutine
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