The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Weihong Zhang - One of the best experts on this subject based on the ideXlab platform.
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finite element simulation of pmma aircraft windshield against bird strike by using a rate and temperature dependent nonlinear viscoelastic constitutive model
Composite Structures, 2014Co-Authors: Jun Wang, Weihong ZhangAbstract:In this study, a nonlinear viscoelastic constitutive model including the rate and temperature effect is developed to describe the mechanical behavior of polymethylmethacrylate (PMMA) material under high speed impact loading. Based on the updated Lagrangian approach, the incremented form of the constitutive model is deduced using the updated Kirchhoff stress tensors and strain tensors. Then this model is implemented with a user subroutine into the explicit dynamic finite element program LS-DYNA to simulate the dynamic behaviors of PMMA aircraft windshield under high speed bird strike. Numerical results are validated against experimental data and further investigations are carried out to study the influence of environmental temperature, impact location on windshield and bird impact velocity.
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fe analysis of dynamic response of aircraft windshield against bird impact
International Journal of Aerospace Engineering, 2013Co-Authors: Uzair Ahmed Dar, Weihong ZhangAbstract:Bird impact poses serious threats to military and civilian aircrafts as they lead to fatal structural damage to critical aircraft components. The exposed aircraft components such as Windshields, radomes, leading edges, engine structure, and blades are vulnerable to bird strikes. Windshield is the frontal part of cockpit and more susceptible to bird impact. In the present study, finite element (FE) simulations were performed to assess the dynamic response of windshield against high velocity bird impact. Numerical simulations were performed by developing nonlinear FE model in commercially available explicit FE solver AUTODYN. An elastic-plastic material model coupled with maximum principal strain failure criterion was implemented to model the impact response of windshield. Numerical model was validated with published experimental results and further employed to investigate the influence of various parameters on dynamic behavior of windshield. The parameters include the mass, shape, and velocity of bird, angle of impact, and impact location. On the basis of numerical results, the critical bird velocity and failure locations on windshield were also determined. The results show that these parameters have strong influence on impact response of windshield, and bird velocity and impact angle were amongst the most critical factors to be considered in windshield design.
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high speed bird impact analysis of aircraft windshield by using a nonlinear viscoelastic model
Applied Mechanics and Materials, 2013Co-Authors: Ahmed Uzair, Jun Wang, Weihong ZhangAbstract:In this study, a numerical model was established to predict the dynamic response of PMMA based polymeric aircraft windshield against high speed bird impact. A detailed nonlinear viscoelastic constitutive model with tensile failure criterion was used to predict the damage and failure of windshield structure. The numerical model was implemented by employing user defined material subroutine (UMAT) in explicit finite element (FE) solver LS-DYNA 3D. Numerical results were validated against experimental data and further investigations were carried out to study the influence of increased bird velocity and impact location on windshield. On the basis of numerical results, the limiting bird velocity and critical impact location on windshield were determined. The study will help to optimize the design of Windshields against high speed bird strikes.
Yibing Li - One of the best experts on this subject based on the ideXlab platform.
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energy absorption mechanism of polyvinyl butyral laminated windshield subjected to head impact experiment and numerical simulations
International Journal of Impact Engineering, 2016Co-Authors: Tingni Xu, Xiaoqing Xu, Yan Wang, Yibing LiAbstract:Abstract In this paper, both experiments and numerical simulations are conducted to investigate the energy absorption mechanism of Polyvinyl butyral (PVB) laminated windshield. Firstly, a set of experiments on windshield upon headform impact are conducted at various impact velocities (6.6 m/s–11.2 m/s) and angles (60°–90°). The energy absorption process of windshield under different impact speeds and angles are investigated. In the meantime, a finite element (FE) model representing the impact process between human head and windshield is set up and validated by experiment results. The influences of PVB interlayer properties (thickness, Young's modulus and yield stress) on the energy absorption capabilities of windshield are studied by an evaluation of maximum contact force and head injury criterion (HIC). Results indicate that PVB interlayer plays a significant role in windshield energy absorption and can be improved with respect to windshield safety design.
Yong Peng - One of the best experts on this subject based on the ideXlab platform.
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finite element modeling of crash test behavior for windshield laminated glass
International Journal of Impact Engineering, 2013Co-Authors: Yong Peng, Jikuang Yang, Caroline Deck, Remy WillingerAbstract:The objective of the present study is to investigate the mechanical behavior of windshield laminated glass in the case of a pedestrian's head impact. Windshield FE models were set up using different combinations for the modeling of glass and PVB, with various connection types and two mesh sizes (5 mm and 10 mm). Each windshield model was impacted with a standard adult headform impactor in an LS-DYNA simulation environment, and the results were compared with the experimental data reported in the literature. The results indicated that the behavior of the windshield model with a double-layered shell of glass and PVB and a tied element connection support test results from previous studies. Furthermore, the influence of glass fracture stress on the same windshield model was investigated, and the cracked area and the peak value of the headform's linear acceleration were determined by the critical fracture stress. It was observed that a 50-MPa fracture stress in the glass best p!
Tingni Xu - One of the best experts on this subject based on the ideXlab platform.
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energy absorption mechanism of polyvinyl butyral laminated windshield subjected to head impact experiment and numerical simulations
International Journal of Impact Engineering, 2016Co-Authors: Tingni Xu, Xiaoqing Xu, Yan Wang, Yibing LiAbstract:Abstract In this paper, both experiments and numerical simulations are conducted to investigate the energy absorption mechanism of Polyvinyl butyral (PVB) laminated windshield. Firstly, a set of experiments on windshield upon headform impact are conducted at various impact velocities (6.6 m/s–11.2 m/s) and angles (60°–90°). The energy absorption process of windshield under different impact speeds and angles are investigated. In the meantime, a finite element (FE) model representing the impact process between human head and windshield is set up and validated by experiment results. The influences of PVB interlayer properties (thickness, Young's modulus and yield stress) on the energy absorption capabilities of windshield are studied by an evaluation of maximum contact force and head injury criterion (HIC). Results indicate that PVB interlayer plays a significant role in windshield energy absorption and can be improved with respect to windshield safety design.
Jun Wang - One of the best experts on this subject based on the ideXlab platform.
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finite element simulation of pmma aircraft windshield against bird strike by using a rate and temperature dependent nonlinear viscoelastic constitutive model
Composite Structures, 2014Co-Authors: Jun Wang, Weihong ZhangAbstract:In this study, a nonlinear viscoelastic constitutive model including the rate and temperature effect is developed to describe the mechanical behavior of polymethylmethacrylate (PMMA) material under high speed impact loading. Based on the updated Lagrangian approach, the incremented form of the constitutive model is deduced using the updated Kirchhoff stress tensors and strain tensors. Then this model is implemented with a user subroutine into the explicit dynamic finite element program LS-DYNA to simulate the dynamic behaviors of PMMA aircraft windshield under high speed bird strike. Numerical results are validated against experimental data and further investigations are carried out to study the influence of environmental temperature, impact location on windshield and bird impact velocity.
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high speed bird impact analysis of aircraft windshield by using a nonlinear viscoelastic model
Applied Mechanics and Materials, 2013Co-Authors: Ahmed Uzair, Jun Wang, Weihong ZhangAbstract:In this study, a numerical model was established to predict the dynamic response of PMMA based polymeric aircraft windshield against high speed bird impact. A detailed nonlinear viscoelastic constitutive model with tensile failure criterion was used to predict the damage and failure of windshield structure. The numerical model was implemented by employing user defined material subroutine (UMAT) in explicit finite element (FE) solver LS-DYNA 3D. Numerical results were validated against experimental data and further investigations were carried out to study the influence of increased bird velocity and impact location on windshield. On the basis of numerical results, the limiting bird velocity and critical impact location on windshield were determined. The study will help to optimize the design of Windshields against high speed bird strikes.
