Uncertainty quantification of relative acoustic nonlinearity parameter of guided waves for damage detection in composite structures

2015 ◽  
Author(s):  
Ming Hong ◽  
Zhu Mao ◽  
Michael D. Todd ◽  
Zhongqing Su ◽  
Xinlin Qing
Keyword(s):  
Damage Detection ◽  
Uncertainty Quantification ◽  
Composite Structures ◽  
Guided Waves ◽  
Nonlinearity Parameter ◽  
Acoustic Nonlinearity Parameter ◽  
Acoustic Nonlinearity

scholarly journals Numerical Simulation on Micro-damage Detection In CFRP Composites Based on Nonlinear Ultrasonic Guided Waves

2021 ◽  
Keyword(s):  
Damage Detection ◽  
Composite Structures ◽  
Guided Waves ◽  
Second Harmonic ◽  
Wave Mode ◽  
Guided Wave ◽  
Reinforced Plastics ◽  
Matrix Cracks ◽  
Nonlinear Ultrasonic ◽  
Contact Acoustic Nonlinearity

Abstract. Micro-damages such as pores, closed delamination/debonding and fiber/matrix cracks in carbon fiber reinforced plastics (CFRP) are vital factors towards the performance of composite structures, which could collapse if defects are not detected in advance. Nonlinear ultrasonic technologies, especially ones involving guided waves, have drawn increasing attention for their better sensitivity to early damages than linear acoustic ones. The combination of nonlinear acoustics and guided waves technique can promisingly provide considerable accuracy and efficiency for damage assessment and materials characterization. Herein, numerical simulations in terms of finite element method are conducted to investigate the feasibility of micro-damage detection in multi-layered CFRP plates using the second harmonic generation (SHG) of asymmetric Lamb guided wave mode. Contact acoustic nonlinearity (CAN) is introduced into the constitutive model of micro-damages in composites, which leads to the distinct SHG compared with material nonlinearity. The results suggest that the generated second order harmonics due to CAN could be received and adopted for early damage evaluation without matching the phase of the primary waves.

scholarly journals Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

2016 ◽  
Vol 41 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Edward Zorębski ◽  
Michał Zorębski ◽  
Marzena Dzida
Keyword(s):  
Ionic Liquid ◽  
Internal Pressure ◽  
Acoustic Impedance ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Thermodynamic Method ◽  
Nonlinearity Parameter ◽  
Molecular Liquids ◽  
Acoustic Nonlinearity Parameter ◽  
Acoustic Nonlinearity

Abstract The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.

Sign in / Sign up

Export Citation Format

Share Document