Quantification of delamination in a composite floor using a novel damage index

Mutlib, Nadom Khalifa; Baharom, Shahrizan

doi:10.1080/10589759.2018.1484919

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…This study used acoustic waves to calculate E, YS, and UTS required to draw the stress–strain curve which is one of the aims of this study, where this study can serve in many applications of the non-destructive evaluation applications 11 , 12 such as testing the strength of pipeline 3 and boiler tubes 13 , which face difficulty in testing directly by using normal tensile tests. Many studies have tried to consider this technique (the acoustic wave’s tests) in recent years, though there was always a margin of miss-match between the predicted and actual values.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the ultimate tensile strength and yield strength for the pure metals and alloys by using the acoustic wave properties

Mohammed

Haris

Azzawi

2020

Sci Rep

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in this paper, the acoustic impedance property has been employed to predict the ultimate tensile strength (UtS) and yield strength (YS) of pure metals and alloys. novel algorithms were developed, depending on three experimentally measured parameters, and programmed in a MAtLAB code. the measured parameters are longitudinal wave velocity of the metal, density, and crystal structure. 19-samples were considered in the study and divided into 3-groups according to their crystal structure; 7-FCC, 6-BCC, and 6-HCB. X-ray diffraction was used to examine the crystal structure of each sample of each group, while longitudinal wave velocity and metals' density were measured experimentally. A comparison between mechanical properties predicted by the model and the AStM standards was done to investigate the validity of the model. furthermore, predicted stress-strain curves were compared with corresponding curves in the pieces literature as an additional validation check. the results revealed the excellence of the model with 85-99% prediction accuracy. The study also proved that if metals are grouped according to their crystal structure, a relation between UtS, YS, and modulus of elasticity (E) properties and wave pressure transmission coefficient (Tr) could be formulated. In recent years, many studies tried to estimate the yield stress (YS) and ultimate tensile strength (UTS) of metals and alloys without using tensile tests 1,2. succeeded in test YS and UTS, for steel alloys only by using a small punch test. Also, Palkovic et al. 3 evaluated YS and toughness for steel pipelines by using non-destructive evaluation. Kancaa et al. 4 used genetic expression programming to predict YS and UTS for cold-rolled steel. All these studies and others remained limited in steel and its alloys. In another hand, many resources focused on the tensile resistance of materials and any other material properties related to this resistance. The tensile resistance of any material, such as the fabric or any other material at room temperature depends on two things. The first is the type of material made from, and the other is the shape of the spun of this material 5,6. The same thing is for the pure metals, where the resistance of the metals depends on the crystal structure and some of the mechanical properties. In fact, the crystal structure and grain boundary types play a decisive role in the distinct slip mode of crystalline materials 7 ; therefore it has an essential role in micro deformation mode. Many studies such as 8,9 focused on the effect of microstructure grain sizes on the flow of stress to explain the mechanism of deformation during the tensile test, therefore Tanga et al. 8 used pure metals such as Fe, Cu, and Ti to illustration this mechanism. This study provides another point of view to study and draw the behavior of pure metals and alloys, where, it focused on crystal structure as a parameter of grain size and grain boundary types then related it with acoustic impedance (Z = ρ × C L), Ys and UTS. On the other hand, the important properti...

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Section: Introductionmentioning

confidence: 99%

“…applications 11,12 such as testing the strength of pipeline 3 and boiler tubes 13 , which face difficulty in testing directly by using normal tensile tests. Many studies have tried to consider this technique (the acoustic wave's tests) in recent years, though there was always a margin of miss-match between the predicted and actual values.…”

mentioning

confidence: 99%