Structural Technology Evaluation and Analysis Program (STEAP). Delivery Order 0046: Multiscale Modeling of Composite Structures Subjected to Cyclic Loading

2012 ◽  
Author(s):  
Caglar Oskay
Keyword(s):  
Cyclic Loading ◽  
Multiscale Modeling ◽  
Composite Structures ◽  
Technology Evaluation ◽  
Analysis Program

Analysis the characteristic of energy and damage of coal-rock composite structure under cycle loading

2021 ◽  
Author(s):  
Tan Li ◽  
Guangbo Chen ◽  
Zhongcheng Qin ◽  
Qinghai Li
Keyword(s):  
Cyclic Loading ◽  
Elastic Energy ◽  
Composite Structure ◽  
Calculation Method ◽  
Composite Structures ◽  
Damage Variable ◽  
Dissipated Energy ◽  
Height Ratio ◽  
Coal Rock ◽  
The Stability

Abstract The stability of coal-rock composite structures is of great significance to coal mine safety production. To study the stability and deformation failure characteristics of the coal-rock composite structure, the uniaxial cyclic loading tests of the coal-rock composite structures with different coal-rock height ratios were carried out. Lithology and coal-rock height ratio play an important role in the energy dissipation of coal-rock composite structures. The higher the coal-rock height ratio, the greater the average elastic energy and dissipated energy produced per cycle of coal-rock composite structures, the smaller the total elastic energy and dissipated energy produced in the process of cyclic loading. Based on the difference of damage variables calculated by dissipative energy method and acoustic emission method, a more sensitive joint calculation method for calculating damage variable was proposed. The joint damage variable calculation method can more accurately and sensitively reflect the damage of coal-rock composite structure under cyclic loading. The macroscopic crack first appears in the coal specimen in the coal-rock composite structure, the degree of broken coal specimens in the composite structure is inversely proportional to the coal-rock height ratio. The strength and deformation characteristics of the coal-rock composite structure are mainly affected by coal sample in the composite structure.

Multiscale atomistic modeling of fracture subjected to cyclic loading

2016 ◽  
Vol 01 (03n04) ◽  
pp. 1640009
Author(s):  
James D. Lee ◽  
Kerlin P. Robert
Keyword(s):  
Cyclic Loading ◽  
Multiscale Modeling ◽  
Temperature Effects ◽  
Temperature Gradients ◽  
Length Scale ◽  
Atomistic Modeling ◽  
Established Fact

It is an established fact that multiscale modeling is an effective way of studying materials over a realistic length scale. In this work, we demonstrate the use of sequential and concurrent multiscale modeling to study the effect of cyclic loading on both the atomic and continuum regions, of graphene, a material which comes with its own set of unique properties. Moreover, to further strengthen this work, we have studied the temperature effects during the cyclic loading, by analyzing the effect of loading and varying temperature gradients.

Preliminary Design of Tubular Composite Structures Using Netting Theory and Composite Degradation Factors

1995 ◽  
Vol 117 (4) ◽  
pp. 390-394 ◽  
Author(s):  
B. W. Tew
Keyword(s):  
Corrosion Resistance ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Composite Structures ◽  
High Strength ◽  
Preliminary Design ◽  
Light Weight ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Design Calculations

Tubular products and process vessels built using fiber-reinforced composite materials provide significant advantages in applications that require corrosion resistance, high strength, and light weight. A design approach based on netting theory is presented which enables engineers to develop preliminary structural designs for these structures using composite materials. The integration of creep, cyclic loading, and environmental degradation factors into initial design calculations is also discussed and illustrated.

scholarly journals Multiscale modeling of the deformation and failure of composite structures

2018 ◽  
Author(s):  
A. E. Burov ◽  
O. G. Burova
Keyword(s):  
Multiscale Modeling ◽  
Composite Structures ◽  
Deformation And Failure

Multiscale Modeling for the Long-Term Behavior of Laminated Composite Structures

AIAA Journal ◽  
2005 ◽  
Vol 43 (8) ◽  
pp. 1815-1822 ◽  
Author(s):  
Anastasia Muliana ◽  
Rami Haj-Ali
Keyword(s):  
Multiscale Modeling ◽  
Composite Structures ◽  
Laminated Composite ◽  
Laminated Composite Structures ◽  
Long Term Behavior

scholarly journals An efficient multiscale modeling framework for nonlinear analyses of composite structures

2018 ◽  
Author(s):  
DC Pham
Keyword(s):  
Multiscale Modeling ◽  
Composite Structures ◽  
Failure Modes ◽  
Global Analysis ◽  
Material Point ◽  
Multiscale Methods ◽  
Local Approach ◽  
Modeling Framework ◽  
Gauss Point ◽  
Load Increment

Traditional multiscale modeling methods of composite structures are based on the global-local approach whereby the global analysis of structures are first performed to determine potential damage regions, followed by local analyses at those regions to identify detailed damage patterns and failure modes. Such an approach does not take into account the localized effects of critical regions on the global analysis and may become less accurate in general. To address better the behavior of local regions on multiscale analyses, homogenization-based multiscale methods are applied. For each load increment, the global problem is solved simultaneously with one Representative Volume Element (RVE) equilibrium problem for each Gauss point of the global mesh. This approach is successful to capture the local behavior at each material point; however, it is computationally expensive since the RVE is called at all the Gauss points in the global model for each load increment. We develop an efficient multiscale modeling method whereby the RVE analyses are only called at specialized locations by multiscale elements and run parallel with the global analysis. The constitutive models of multiscale elements are defined in a user-defined element subroutine (UEL) where stiffnesses of the multiscale elements are unknown at the beginning of the analysis. They can only be obtained by performing a series of RVE analyses for each set of loads received from the global analysis. The advantage of the proposed method is that the stiffnesses of the multiscale elements are directly computed from the RVE analyses and keep updated for each global load increment. The nested multiscale modeling is implemented by Python script and highly capable for nonlinear analysis of composite structures.

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