Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals

Mohammed, Arshed Abdulhamed; Haris, Sallehuddin Mohamed; Nuawi, Mohd. Zaki

doi:10.1016/j.ultras.2014.07.001

Cited by 4 publications

(9 citation statements)

References 33 publications

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“…36 Meanwhile, the sound-absorbing cotton enhances the absorption of the sound wave, which weakens the transmitted wave. 41 Similarly, it also caused better sound insulation in the biocomposites. The energy of the sound waves converts into heat via friction and resonance.…”

Section: Resultsmentioning

confidence: 98%

Mechanical and acoustical properties of polylactic acid based multilayer-structured foam biocomposites

Yao

Zhou

et al. 2016

Journal of Reinforced Plastics and Composites

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Polylactic acid (PLA) based multilayer-structured foam biocomposites were prepared in a three-step process. In step 1, PLA plastic particles mixed with hollow glass beads (HGB) and other additives were blended, pelletized, and foamed and turned into plies using compression moldings. During step 2, the plies were stacked alternately and glued together with glass-fiber cloth reinforced PLA interlayers. The result is a multilayer-structured ply. In step 3, environmental soundabsorbing cotton was spliced on both sides of the ply to obtain the desired foam biocomposites. Then, foam morphology, and both mechanical and acoustical properties of the plies were investigated using a scanning electron microscope, a universal testing machine and a multianalyzer system. Our experimental results indicate that the compressive strength and acoustical properties of the plies made during the first step perform best when the mass fraction of HGB is 15%. We then compared a ply made in the first step with the multilayer-structured ply made in the second step. We found that the mechanical and sound insulation properties became more uniform after the addition of a PLA layer. We also found that the sound-absorbing cotton improved sound insulation by about 30%. The biocomposites achieved the best mechanical and acoustical properties after careful consideration of several factors.

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Section: Resultsmentioning

confidence: 98%

Mechanical and acoustical properties of polylactic acid based multilayer-structured foam biocomposites

Yao

Zhou

et al. 2016

Journal of Reinforced Plastics and Composites

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“…Arshed et al [92,93] noted that there is a big difference between the standard values of E, according to ASTM from one side, and the values of E calculated from TOF tests, for a group of metals which are the refractory metals, from another side. To address this issue, Refs.…”

Section: Figurementioning

confidence: 99%

“…To address this issue, Refs. [92,93] provided a new relationship between pressure transmission coefficient (PTC) and E × ρ of the test specimen (TS) as shown in Equations ( 6)- (8) to calculate E for refractory and non-refractory metals:…”

Section: Figurementioning

confidence: 99%

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Role of Piezoelectric Elements in Finding the Mechanical Properties of Solid Industrial Materials

Mohammed

Haris²,

Nuawi³

2018

Applied Sciences

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Recent developments in ultrasonic material testing have increased the need to evaluate the current status of the different applications of piezoelectric elements (PEs). This research have reviewed state-of-the-art emerging new technology and the role of PEs in tests for a number of mechanical properties, such as creep, fracture toughness, hardness, and impact toughness, among others. In this field, importance is given to the following variables, namely, (a) values of the natural frequency to PEs, (b) type and dimensions of specimens, and (c) purpose of the tests. All these variables are listed in three tables to illustrate the nature of their differences in these kinds of tests. Furthermore, recent achievements in this field are emphasized in addition to the many important studies that highlight the role of PEs.

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“…This because these devices give correct results for normal materials such as Al, Fe, Zn.etc., however, for metals such as refractory metals, the results are incorrect 22 . Mohammed et al 24 succeeded in the calculation of the E for many metals and alloys, through finding a relationship between E × ρ and the pressure transmitted coefficient. Even though of this succeeding in finding E however, Mohammed et al 24 did not mention anything about the estimation of the YS and UTS for these metals, despite its importance.…”

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confidence: 99%

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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Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals

Cited by 4 publications

References 33 publications

Mechanical and acoustical properties of polylactic acid based multilayer-structured foam biocomposites

Mechanical and acoustical properties of polylactic acid based multilayer-structured foam biocomposites

Role of Piezoelectric Elements in Finding the Mechanical Properties of Solid Industrial Materials

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

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