What the Textbooks Won't Teach You About Interactive Composite Failure Criteria

2008 ◽  
pp. 413-413-24
Author(s):  
LJ Hart-Smith
Keyword(s):  
Failure Criteria ◽  
Composite Failure

Structural design and analysis of CFRP boom for concrete pump truck

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940033 ◽  
Author(s):  
Sang-Jin Lee ◽  
Il-Sup Chung ◽  
Sung-Youl Bae
Keyword(s):  
Structural Design ◽  
Static Load ◽  
Equivalent Stress ◽  
Failure Criteria ◽  
Steel Component ◽  
Fiber Failure ◽  
Composite Failure ◽  
Reinforced Plastic ◽  
Concrete Pump Truck ◽  
Concrete Pump

This research presents structural design and analysis results of applying a composite boom structure on a Concrete Pump Truck (CPT). Carbon Fiber Reinforced Plastic (CFRP) is used to complete the structural design of the end boom to reduce the weight of the CPT. The weight of the newly designed end boom is reduced by 32% compared to the original steel component. Structural analysis is accomplished by applying static load combinations of self-weight of the boom and the weights of the pipes, the concrete and the drain hose. The results show that the tip deflection is reduced by 30% compared to the conventional end boom. Also, equivalent stress is considerably lower than the conventional design. Composite failure evaluation of the CFRP end boom is conducted by post-processing the stress results using Puck’s failure criteria. The evaluation results show that the design criteria are met on the static load of the pump truck. Specifically, it is expected that fiber failure and inter fiber failure of the boom do not occur under loading conditions according to the design evaluation results.

Analysis of Drop-Fall Damage Failure of Composite Cylinder

2011 ◽  
Vol 480-481 ◽  
pp. 113-116
Author(s):  
Ying Tie ◽  
Cheng Li ◽  
Ping Xu
Keyword(s):  
Structural Damage ◽  
Failure Criteria ◽  
Composite Cylinder ◽  
Dynamic Impact ◽  
Composite Failure ◽  
Axial Tensile ◽  
The Moment ◽  
Hoop Stresses ◽  
The Impact ◽  
Composite Cylinders

Based failure criteria of composite materials structural damage and simulation of finite element dynamic impact, the drop process and damage failure of composite cylinder are calculated and analysed. For composite cylinders with different wind angles falling from a height, the stresses of internal points during the impact process are obtained. Based on the value of the process stress, the failure of the cylinder is analysed. The results show that at the moment when the cylinder bounces back after impacted with the ground, the stress and strain reaches to the maximum. The maximum hoop stresses are at cylinder mouth and cylinder bottom which collide with ground. Maximum axial tensile stresses are at the central body of cylinder. The stress distribution of 13 degrees fiber angle of cylinder is slightly less than that of 25 degree. By Tsai-Wu composite failure criterion, there is no failure of the composite cylinder.

Structural Optimization of Laminated Composite Blade Using Particle Swarm Optimization

2012 ◽  
Author(s):  
H. Li ◽  
K. Chandrashekhara
Keyword(s):  
Particle Swarm Optimization ◽  
Particle Swarm ◽  
Laminated Composite ◽  
Failure Criteria ◽  
Blade Design ◽  
Loading Conditions ◽  
Swarm Optimization ◽  
Composite Failure ◽  
Composite Blade ◽  
Discrete Pso

Composite blades working underwater experience complicated loading conditions. Robust design of a composite blade for hydrokinetic applications should satisfy varying loading conditions and conservative failure evaluations. Blade manufacturing using composites requires extensive optimization studies in terms of composite materials, number of layers, stacking sequences, ply thickness and orientation. In the current study, particle swarm optimization (PSO) technique is adopted to conduct composite lay-up optimization for the turbine blade. Layer numbers, ply thickness and ply orientations are optimized using standard PSO (SPSO) to minimize weight. Composite failure criteria are applied using finite element method to generate the most conservative blade design. Based on the blade lay-up design with minimized weight, stacking sequence of the blade lay-up was optimized to maximum safety factor of the designed blade using permutation discrete PSO (PDPSO). To improve the efficiency of the algorithm, the concepts of valid/invalid exchange, and memory checking were introduced into PDPSO. Meanwhile, another discrete PSO using partially mapped crossover (PMX) technique was used to validate the simulation results optimized by PDPSO. A final composite blade design with minimized weight and maximized load-carrying capacity was presented.

Validation of the Quadratic Composite Failure Criteria with Out-of-Plane Shear Terms

2002 ◽  
Vol 36 (15) ◽  
pp. 1879-1888 ◽  
Author(s):  
Steven Huybrechts ◽  
Arup Maji ◽  
Jennifer Lao ◽  
Peter Wegner ◽  
Troy Meink
Keyword(s):  
Failure Criteria ◽  
Plane Shear ◽  
Composite Failure ◽  
Out Of Plane

scholarly journals Development of PMC Numerical Model for Soil and Stone Mixture

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Zhili Sui ◽  
Zhaoguang Li ◽  
Yanhua Gao ◽  
Yuan Li ◽  
Yiwu Zheng ◽  
...  
Keyword(s):  
Shear Failure ◽  
Numerical Solutions ◽  
Physical And Mechanical Properties ◽  
Failure Criteria ◽  
Model Verification ◽  
Triaxial Tests ◽  
Strength Analysis ◽  
Flow Rule ◽  
True Triaxial ◽  
Composite Failure

Soil and stone mixture is widely distributed in China, and its physical and mechanical properties are complex, which has a significant impact on geotechnical engineering. Usually soil and stone mixture shows anisotropic features along or perpendicular to the direction of settled layers, and the strength will be significantly affected by intermediate principal stress. True triaxial tests were carried on, Paul–Mohr–Coulomb (PMC) failure criterion was used for the strength analysis in soil-stone mixture, and related parameters of PMC model were obtained. A user-defined PMC numerical constitutive model was developed for FLAC3D. Composite failure criteria of shear failure and tension cut-off were applied for numerical analysis, and nonassociated flow rule was proposed based on the Mohr–Coulomb model. Verification modelling was applied as well, and deviation between analytical and numerical solutions in strains of X direction, Y direction, and Z direction was 1.0013, 1.0003, and 1.002, respectively.

A failure criterion revision method for composite materials

2020 ◽  
pp. 096739112093966
Author(s):  
Ju Qiu ◽  
Ion Stiharu
Keyword(s):  
Composite Materials ◽  
Failure Mechanism ◽  
Failure Criterion ◽  
Failure Surface ◽  
Failure Criteria ◽  
Higher Order ◽  
Composite Failure ◽  
Failure Function ◽  
Material Behaviors

Failure criterion predictions often have substantial errors due to the complexity of failure mechanism or different material behaviors, especially composite failure. In this study, an example of delamination is employed to demonstrate the general failure criterion revision of composites. In the present research, the failure function can be raised to a higher order, and also be reduced to a lower one, by fitting the exponents of failure criterion. This method can be easily used to describe the observed, experimented, or computed data, particularly with no law or no rules. Further, the importance of this exponent revision is amplified when the failure surface becomes more complicated. The proposed approach is also to define and calculate the failure criteria of multiplying laminates.

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