Inverse detection of constituent level elastic parameters of FRP composite panels with elastic boundaries using finite element model updating

Mishra, Asim; Chakraborty, Sushanta

doi:10.1016/j.oceaneng.2015.11.003

Cited by 25 publications

(22 citation statements)

References 45 publications

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“…where K r 0 e is the addition stiffness matrix caused by the pre-stress distribution, G is the strain transformation matrix, and S is the pre-stress transformation matrix. The transformation matrix S can be written as Substituting equations (9) and (10) into equation 8, then the differential function can be expressed as…”

Section: Pre-stress Modelmentioning

confidence: 99%

“…7,8 In the structural model updating, such as natural frequencies, mode shapes, and dynamic response parameters, are initially more interesting than the utilization of other parameters used in the structural model updating because such an approach allows a convenient model interpretation. 9,10 The structural model updating problem is essentially a structural optimization problem and it involves minimizing the given objective function under certain constraints condition, and it is necessary to define the corresponding optimization strategies in the structural model updating. [11][12][13] The pre-stress (initial stress) often exists in the structures before undertaking the external loading, which includes welding residual stress, structural manufacturing defects, material thermal effects, static loading, and so on, these types of pre-stress are defined as complex pre-stress.…”

Section: Introductionmentioning

confidence: 99%

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Structural model updating study in consideration of complex pre-stress distribution

Chen

Huang

Hong

2020

Journal of Low Frequency Noise, Vibration and Active Control

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In the present work, to improve the accuracy of the numerical model, the structural model updating problem is investigated in consideration of the influence of pre-stress. In order to eliminate the influence of complex pre-stress on the calculation scale and calculation precision for the continuous structures, the structural dynamic model updating is implemented by using the structural optimization strategy. The optimization function is established, in which the residual value of natural frequency parameter between the finite element model with/without complex pre-stress distribution is defined as objective function under certain constraints. Finally, the thin cylindrical shell structure with welding residual stress distribution, for example, the structural model updating is carried out, and the numerical results verify the feasibility and effectiveness of the proposed method.

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Section: Pre-stress Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural model updating study in consideration of complex pre-stress distribution

Chen

Huang

Hong

2020

Journal of Low Frequency Noise, Vibration and Active Control

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“…Sun et al [27] developed a strategy to identify the temperaturedependent properties of a thermoelastic structure in thermal environment taking into time-varying material properties and thermal stresses account. Mishra and Chakraborty [28,29] dealt with a modal analysis based inverse identification of material properties of fiber reinforced plastics composite plates with rotational flexibility at boundaries and panels having elastically restrained boundary from the experimental modal testing using finite element model updating.…”

Section: Introductionmentioning

confidence: 99%

Statistical Identification of Parameters for Damaged FGM Structures with Material Uncertainties in Thermal Environment

Guo

2018

Complexity

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Considering that the statistic numerical characteristics are often required in the probability-based damage identification and safety assessment of functionally graded material (FGM) structures, an stochastic model updating-based inverse computational method to identify the second-order statistics (means and variances) of material properties as well as distribution of constituents for damaged FGM structures with material uncertainties is presented by using measurable modal parameters of structures. The region truncation-based optimization method is employed to simplify the computational process in stochastic model updating. In order to implement the forward propagation of uncertainties required in the stochastic model updating and avoid large error resulting in the nonconvergence of the iteration process, an algorithm is proposed to compute the covariance between the modal parameters and the identified parameters for damaged FGM structures. The proposed method is illustrated by a numerically simulated damaged FGM beam with continuous spatial variation of material properties and verified by comparing with the Monte-Carlo simulation (MCS) method. The influences of the levels and sources of measured data uncertainties as well as the boundary conditions on the identification results are investigated. The numerical simulation results show the efficiency and effectiveness of the presented method for the identification of material parameter variability by using the measurable modal parameters of damaged FGM structures.Hindawi Complexity Volume 2018, Article ID 9034865, 21 pages https://doi.

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“…Chloride ions are a major cause of corrosion of steel in concrete, which governs the effective life of the structures and their maintenance costs [ 4 ]. The corrosion-resistant characteristic makes FRPs ideal for applications subjected to the chloride ion environment [ 5 , 6 ]. Due to the versatile applications of concrete structures, FRP-reinforced concrete members may often be exposed to wetting and drying cycles, deicing salts in cold climates, sea salts in hot–humid climates, and many other severe environments [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the durability of FRP composites is more complex than corrosion of steel reinforcement, because degradation of the material could depend both on the resin matrix and fibers and on their interface bond behavior [ 7 , 8 , 11 ]. Many previous studies have been conducted on the performance degradation of FRP-reinforced structures in a chloride-containing environment [ 4 , 5 , 6 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Durability of Basalt Fiber-Reinforced Polymer (BFRP) Sheets and the Epoxy Resin Matrix under a Wet–Dry Cyclic Condition in a Chloride-Containing Environment

Xie

Zhang

et al. 2017

Polymers

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Basalt fiber-reinforced polymer (BFRP) composites are receiving increasing attention as they represent a low-cost green source of raw materials. FRP composites have to face harsh environments, such as chloride ions in coastal marine environments or cold regions with salt deicing. The resistance of FRPs subjected to the above environments is critical for the safe design and application of BFRP composites. In the present paper, the long-term durability of BFRP sheets and the epoxy resin matrix in a wet-dry cyclic environment containing chloride ions was studied. The specimens of the BFRP sheet and epoxy resin matrix were exposed to alternative conditions of 8-h immersion in 3.5% NaCl solution at 40 • C and 16-h drying at 25 • C and 60% relative humidity (RH). The specimens were removed from the exposure chamber at the end of the 180th, 270th and 360th cycles of exposure and were analyzed for degradation with tensile tests, scanning electron microscopy (SEM) and void volume fractions. It was found that the tensile modulus of the BFRP sheet increased by 3.4%, and the tensile strength and ultimate strain decreased by 45% and 65%, respectively, after the 360th cycle of exposure. For the epoxy resin matrix, the tensile strength, tensile modulus and ultimate strain decreased by 27.8%, 3.2% and 64.8% after the 360th cycle of exposure, respectively. The results indicated that the degradation of the BFRP sheet was dominated by the damage of the interface between the basalt fiber and epoxy resin matrix. In addition, salt precipitate accelerated the fiber-matrix interfacial debonding, and hydrolysis of the epoxy resin matrix resulted in many voids, which accelerated the degradation of the BFRP sheet.

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Inverse detection of constituent level elastic parameters of FRP composite panels with elastic boundaries using finite element model updating

Cited by 25 publications

References 45 publications

Structural model updating study in consideration of complex pre-stress distribution

Structural model updating study in consideration of complex pre-stress distribution

Statistical Identification of Parameters for Damaged FGM Structures with Material Uncertainties in Thermal Environment

Long-Term Durability of Basalt Fiber-Reinforced Polymer (BFRP) Sheets and the Epoxy Resin Matrix under a Wet–Dry Cyclic Condition in a Chloride-Containing Environment

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