A rate-dependent model and its user subroutine for cohesive element method to investigate propagation and branching behavior of dynamic brittle crack

2021 ◽  
Vol 136 ◽  
pp. 104233
Author(s):  
Shen Wang ◽  
Dongyin Li ◽  
Zhenhua Li ◽  
Jinzhao Liu ◽  
Shuang Gong ◽  
...  
Keyword(s):  
Cohesive Element ◽  
Brittle Crack ◽  
Rate Dependent ◽  
User Subroutine ◽  
Dependent Model ◽  
Element Method

Parameter Sensitivity in Numerical Modelling of Ice-Structure Interaction With Cohesive Element Method

2016 ◽  
Author(s):  
Dianshi Feng ◽  
Sze Dai Pang ◽  
Jin Zhang
Keyword(s):  
Element Model ◽  
Offshore Structures ◽  
Parameter Sensitivity ◽  
The Arctic ◽  
Cohesive Element ◽  
Structure Interaction ◽  
Marine Structure ◽  
Ice Loads ◽  
The Stability ◽  
Element Method

The increasing marine activities in the Arctic has resulted in a growing demand for reliable structural designs in this region. Ice loads are a major concern to the designer of a marine structure in the arctic, and are often the principal factor that governs the structural design [Palmer and Croasdale, 2013]. With the rapid advancement in computational power, numerical method is becoming a useful tool for design of offshore structures subjected to ice actions. Cohesive element method (CEM), a method which has been widely utilized to simulate fracture in various materials ranging from metals to ceramics and composites as well as bi-material systems, has been recently applied to predict ice-structure interactions. Although it shows promising future for further applications, there are also some challenging issues like high mesh dependency, large variation in cohesive properties etc., yet to be resolved. In this study, a 3D finite element model with the use of CEM was developed in LS-DYNA for simulating ice-structure interaction. The stability of the model was investigated and a parameter sensitivity analysis was carried out for a better understanding of how each material parameter affects the simulation results.

scholarly journals A hybrid embedded cohesive element method for predicting matrix cracking in composites

2016 ◽  
Vol 136 ◽  
pp. 554-565 ◽  
Author(s):  
Mathew W. Joosten ◽  
Matthew Dingle ◽  
Adrian Mouritz ◽  
Akbar A. Khatibi ◽  
Steven Agius ◽  
...  
Keyword(s):  
Matrix Cracking ◽  
Cohesive Element ◽  
Element Method

Evaluation of interfacial properties in SiC composites using an improved cohesive element method

2018 ◽  
Vol 29 (2) ◽  
Author(s):  
Hang Zang ◽  
Xing-Qing Cao ◽  
Chao-Hui He ◽  
Zhi-Sheng Huang ◽  
Yong-Hong Li
Keyword(s):  
Interfacial Properties ◽  
Cohesive Element ◽  
Sic Composites ◽  
Element Method

A strain-rate dependent model for crack growth

1992 ◽  
pp. 109-119 ◽  
Author(s):  
G. E. Papakaliatakis ◽  
E. E. Gdoutos ◽  
E. Tzanaki
Keyword(s):  
Strain Rate ◽  
Crack Growth ◽  
Rate Dependent ◽  
Dependent Model

scholarly journals Simulation of Ice-Propeller Collision with Cohesive Element Method

2019 ◽  
Vol 7 (10) ◽  
pp. 349 ◽  
Author(s):  
Zhou ◽  
Wang ◽  
Diao ◽  
Ding ◽  
Yu ◽  
...  
Keyword(s):  
Rotational Speed ◽  
Constitutive Law ◽  
Impact Loads ◽  
Cohesive Element ◽  
Ice Loads ◽  
Ice Floes ◽  
The Time Domain ◽  
Contact Position ◽  
The Impact ◽  
Element Method

The existence of ice in ice-covered waters may cause damage to the propeller of polar ships, especially when massive ice floes are submerged around the hull. This paper aims to simulate an interaction process of a direct ice collision with a propeller based on the cohesive element method. A constitutive law is applied to model the ice material. The model of ice material is validated against model test results. The resulting impact loads acting on the contact surfaces and the corresponding ice block velocity are calculated in the time domain. The ice crushing, shearing and fracture failures are reproduced in the simulation. The convergence study with three meshing sizes of ice block is performed. To carry out a parametric study, five parameters are selected for analysis. These parameters are composed of rotational speed, direction of the propeller, initial speed of the ice block, contact position, and area between the ice and the propeller. The results show that the ice loads are affected by the five factors significantly. Ice loads tend to increase by decreasing the rotational speed, increasing the initial ice speed and the contact area, and changing the rotational direction from clockwise to counterclockwise. The effect of the contact position on the impact loads is relatively complex, depending on rotational speeds of the propeller.

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