A coupled elastic-plastic damage model for the mechanical behavior of three-dimensional (3D) braided composites

2018 ◽  
Vol 157 ◽  
pp. 86-98 ◽  
Author(s):  
Jingran Ge ◽  
Chunwang He ◽  
Jun Liang ◽  
Yanfei Chen ◽  
Daining Fang
Keyword(s):  
Mechanical Behavior ◽  
Damage Model ◽  
Three Dimensional ◽  
Braided Composites ◽  
Elastic Plastic ◽  
3D Braided Composites ◽  
Plastic Damage

A multiscale elasto-plastic damage model for the nonlinear behavior of 3D braided composites

2019 ◽  
Vol 171 ◽  
pp. 21-33 ◽  
Author(s):  
Chunwang He ◽  
Jingran Ge ◽  
Dexing Qi ◽  
Jiaying Gao ◽  
Yanfei Chen ◽  
...  
Keyword(s):  
Damage Model ◽  
Nonlinear Behavior ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Plastic Damage

Research on Fabricating Technology of Three Dimensional Integrated Braided Composite I Beam

2010 ◽  
Vol 136 ◽  
pp. 59-63 ◽  
Author(s):  
X.Y. Pei ◽  
Jia Lu Li
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Research Result ◽  
Three Dimensional ◽  
Void Content ◽  
Braided Composites ◽  
Braided Composite ◽  
Transfer Molding ◽  
3D Braided Composites

In this paper the fabricating technology of three dimensional (3D) integrated braided composite I beam is researched, including: braiding technology of 3D braided I beam preform, the orientation of fiber-tow in the I beam preform, the optimizing of process parameters of resin transfer molding (RTM) for 3D braided composite I beam, and the design of mould for consolidation of composite I beam. The quality of 3D braided composites is good analyzed by ultrasonic A-scan, void content calculation and microscope observation. The research result will provide a good way for designing and fabricating high performance 3D integrated braided composite components with irregular cross section.

Multi-Axial Concrete Models for Nonlinear Analysis

2014 ◽  
Vol 1065-1069 ◽  
pp. 2099-2103
Author(s):  
Hu Qi ◽  
Yun Gui Li
Keyword(s):  
Constitutive Model ◽  
Nonlinear Analysis ◽  
Damage Model ◽  
Nonlinear Characteristic ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Plastic Damage ◽  
Damage Constitutive Model

The most widely used multi-axial concrete models including elastic-plastic model and elastic plastic damage model are expounded and it is recognized that the elastic plastic damage model is more reasonable to reflect nonlinear characteristic of concrete. The development and application of elastic plastic damage model is comprehensively appraised and a practical elastic plastic damage constitutive model is established. Finally the dynamic trend of constitutive model of concrete development is introduced.

Algorithm Design of Four-Step Three-Dimensional Braided Composite Structures in Matlab Environment

2013 ◽  
Vol 365-366 ◽  
pp. 1144-1147
Author(s):  
Chao Deng ◽  
Jian Jun Jiang ◽  
Liang Chao Fang
Keyword(s):  
Composite Structures ◽  
Algorithm Design ◽  
Three Dimensional ◽  
The Internet ◽  
3D Display ◽  
Braided Composites ◽  
Design Quality ◽  
3D Braided Composites ◽  
Geometric Simulation ◽  
Moving Process

For solving the problem of the geometric simulation of 3D braided composites, taking four-step rectangular 3D braided fabrics as an example, and based on the analysis of yarn moving regulation, the mathematical models between the braiding technique parameters and the geometric structures is established. By taking UG as the 3D display platform and MATLAB as the control core, 3D geometric simulation of the pre-modeling entity is realized. Such a simulation enables the users to observe the braid spatial structure and braiding moving process intuitively and modify them dynamically on the Internet. With this method, the design quality and efficiency of products will be raised remarkably.

Experimental Research on Low-Velocity Impact Properties of 3D Braided Composites

2010 ◽  
Vol 97-101 ◽  
pp. 1741-1744
Author(s):  
Qi Jia ◽  
Ya Nan Jiao
Keyword(s):  
Three Dimensional ◽  
Low Velocity Impact ◽  
Braided Composites ◽  
Low Velocity ◽  
Impact Properties ◽  
Damage Area ◽  
3D Braided Composites ◽  
Glass Fiber Reinforced ◽  
Braiding Angle ◽  
The Impact

This research dealt with the impact properties of glass fiber reinforced composites manufactured from different structures of three-dimensional braided preforms. Three different architectures of the braid structures, 4-Direction, 5-Direction and 6-Direction, were investigated together with three further various braiding angles of each architecture. The effect of architecture and braiding angle parameters upon the impact was examined. Damage morphology of the impacted materials was characterized. It has been found that the parameters affected the damage resistance and tolerance of composites evidently. 6-Directional composites showed higher impact toughness than the others with same braiding angle. Failure of the specimens with small damage area revealed the brittle characteristic of 3D braided composite.

A Coupled Elastic-Plastic Damage Model for Rock Material

2014 ◽  
Vol 488-489 ◽  
pp. 799-802
Author(s):  
Hong Jie Chen ◽  
Wei Ya Xu ◽  
Ru Bin Wang ◽  
Wei Wang
Keyword(s):  
Damage Mechanics ◽  
Damage Model ◽  
Confining Pressure ◽  
Damage Mechanism ◽  
Coupling Model ◽  
Internal Variable ◽  
Elastic Plastic ◽  
Softening Behavior ◽  
Plastic Damage ◽  
Damage Constitutive Model

With complex mechanics character and under the action of compression and tension in tri-direction, rock will show coupled plastic-damage mechanism as its basic character. Phenomenological coupled elastic-plastic-damage constitutive model with internal variable is proposed based on thermal mechanics theory, elastic law and macro damage mechanics. Numerical experiments on this model and analyze the model character. The result shows that the coupling model could realize rocks softening behavior brought about by damage and strength enlargement caused by confining pressure increasing.

A Practical Elastic Plastic Damage Model for Concrete

2011 ◽  
Vol 243-249 ◽  
pp. 313-318 ◽  
Author(s):  
Hu Qi ◽  
Yun Gui Li ◽  
Xi Lin Lu
Keyword(s):  
Stress State ◽  
Damage Mechanics ◽  
Hydrostatic Stress ◽  
Axial Stress ◽  
Stress Component ◽  
Damage Model ◽  
Continuum Damage Mechanics ◽  
Deviatoric Stress ◽  
Elastic Plastic ◽  
Plastic Damage

In this paper, an elastic plastic damage model is presented based on the combined use of elastic plastic constitutive equations along with continuum damage mechanics. A tensile and a compressive damage variable are adopted to describe the different responses of concrete under tension and compression, respectively. The Helmholtz Free Energy is decomposed into hydrostatic stress component and deviatoric stress components. The hydrostatic stress component is neglected and the deviatoric stress component is amended according to stress state, resulting in a more accurate description of the concrete’s response under multi-axial stress state. Finally, through several numerical simulations it is proved that the proposed model has the capability of simulating typical nonlinear performances of concrete material.

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