The Consequences of Material Nonlinearity on the Axisymmetric Flexural Vibration Measurements for Estimating the Dynamic Elastic Modulus of Damaged Cement Based Materials

Abstract

Elastic modulus measurements are often required to evaluate the structural performance or to estimate the damage in cement-based materials. The axisymmetric flexural vibration (AFV) of a thick circular disk is a test method that can be used to estimate the dynamic elastic modulus of cement-based materials. Cement-based materials are inherently nonlinear materials and their nonlinearity increases with damage. The main objectives of this paper are to investigate the consequences of material nonlinearity on the AFV measurements, and to understand the implications of the change of material nonlinearity with damage on these measurements. In this work, experimental measurements are performed on mortar specimens damaged by freeze-thaw. Acoustic emission is used as a benchmark method to monitor and quantify the damage.

Linear and nonlinear resonant ultrasonic techniques applied to assess delayed ettringite formation on concrete samples

“…Still, the need for new physical parameters that provide further information on the mechanical performance of concrete upon DEF has been claimed in several study reviews [9][10][11]. In recent years, the evaluation of the nonlinear mechanical behavior through resonant experiments has been satisfactorily applied to assess different durability distresses in concrete, such as alkali-silica reaction [12][13][14] freezing-thawing damage [15][16][17], thermal damage [18,19], and carbonation [20,21]. The evaluation of the nonlinear properties of concrete upon the development of DEF has seldom been studied.…”

Deep learning surrogate interacting Markov chain Monte Carlo based full wave inversion scheme for properties of materials quantification

“…Tomography techniques are valuable and widely used in engineering, geoscience and medical sciences. Examples of such tomography based techniques include, Infrared Thermography [1,2], Electrical Impedance Tomography [3][4][5][6][7][8][9], Electrical Capacitance Tomography [10,11], radar acoustics and Radiography [12,13], X-Ray Computed Tomography [14][15][16], and stress wave based tomography [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among these methods, stress wave-based methods are attractive since they can provide information about the mechanical properties of materials and structures.…”