Modeling, characterization and parametric identification of low velocity impact behavior of time-dependent hyper-viscoelastic sandwich panels

2017 ◽  
Vol 233 (4) ◽  
pp. 622-636
Author(s):  
Soroush Sadeghnejad ◽  
Yousef Taraz Jamshidi ◽  
Reza Mirzaeifar ◽  
Mojtaba Sadighi
Keyword(s):  
Finite Element ◽  
Sandwich Panels ◽  
Deep Understanding ◽  
Material Behavior ◽  
Time Dependent ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Velocity Impact ◽  
Elastomeric Foams

Accurate and deep understanding of the mechanical and physical behavior of sandwich panels with soft elastomeric foams, e.g. cellular solids, such as ethylene vinyl acetate is a key task in designing these structures, and also optimizing their mechanical behavior. The main objective of the present research is to present an applicable method to determine the non-linear hyper-viscoelastic response of elastomeric sandwich panels to low velocity impact loadings, by presenting an applied method. A combination of experimental results and finite element analysis, in conjunction with optimization method is used to determine the hyper-viscoelastic behavior of the studied sandwich panels. The suggested combinational approach can replace the time-consuming and expensive creep and/or relaxation experiments. A relatively simple approach is proposed to identify time-dependent viscoelastic material behavior of elastomeric foams. The calibrated finite element model is utilized to perform a set of parametric studies and the effect of various material properties is studied on the low velocity impact response of sandwich plates.

scholarly journals Simulation of Low Velocity Impact on Composite Hemispherical Shell

2014 ◽  
Vol 564 ◽  
pp. 406-411
Author(s):  
Parnia Zakikhani ◽  
R. Zahari ◽  
Mohamed Thariq Hameed Sultan
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Experimental Testing ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Element Analysis ◽  
Velocity Impact ◽  
Hemispherical Shell ◽  
The Impact

Impact simulation with finite element analysis is an appropriate manner to reduce the cost and time taken to carry out an experimental testing on a component. In this study, the impact behavior of the composite hemispherical shell induced by low velocity impact is simulated in ABAQUS software with finite element method. To predict the responses of Kevlar fabric/polyester, glass fabric/polyester and carbon fabric/polyester in the form of a hemisphere, once as one layer and then as a three-layered composite under applied force by an anvil. The sequences of layers are changed, to investigate and compare the occurred alternations in the amount of energy absorption, impact force and specific energy absorption (SEA). The comparison of results showed that the highest and the lowest quantity of energy absorption and SEA belong to Carbon/Glass/Kevlar (CGK) and Kevlar/Carbon/Glass (KCG) respectively.

Accuracy and Computational Efficiency of Finite Element Models for Low Velocity Impact on Composite Structures Subject to Progressive Damage and Delamination1

2015 ◽  
Vol 10 (6) ◽  
Author(s):  
Ahmed H. A. Ibrahim ◽  
Ahmet S. Yigit
Keyword(s):  
Finite Element ◽  
Computational Efficiency ◽  
Composite Structures ◽  
Material Behavior ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Contact Modeling ◽  
Velocity Impact ◽  
Composite Damage

There has been growing interest to use composites in load carrying structures where high strength and light weight are of major concern, e.g., oil industry (offshore structures and platforms, pipe systems, and tubings), sports equipment, automobiles, and aircraft industries. Despite extensive research in the last two decades, mechanical behavior of composite structures subject to contact and impact loading is still not well understood. It is well known that composites are highly vulnerable to various modes of failure and damage due to impact by foreign objects. Such impact events are not only dependent on the material behavior but also on the dynamics of the structure. Finite element (FE) packages are capable of simulating impact response of composite structures subject to impact. It requires extensive training and in-depth knowledge to obtain an adequate FE model with proper impact response prediction and acceptable computational efficiency. Limited FE models have the ability to capture composite damage due to impact when internal delamination or fiber/matrix failures are present. Severe nonlinearities are encountered during FE analysis to capture composite damage progression or material degradation. This work investigates different FE modeling approaches by analyzing their prediction of force–time history and force–indentation curve occurring in composite plates as a result of low velocity impact. The objective is to provide guidelines on selecting the most appropriate approach for a given impact situation. Moreover, a computationally efficient approach in contact modeling is presented. The proposed approach yields better computation efficiency for contact modeling on both isotropic and composite materials.

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