### Abstract

Refractory metals have attracted increasing interest in recent years because of their use in many high-temperature applications. However, the characteristics of these metals calculated using loaded tests (such as tensile strength tests) differ considerably from those calculated using one of the most famous methods in NDT which is called time of flying of the wave (TOF).The present study presents two solutions based on calculating the pressure transmission coefficient (PTC) of the transmitted wave between the test sample and magnesium metal. The first is based on the development of a highly accurate algorithm that lowers the cost by determining the acoustic impedance of the test specimen to calculating mechanical properties. Up to 26 theoretical tests were done (10 of these tests for refractory materials) according to their known mechanical properties to verify the accuracy of the algorithm. The convergence in results ranged from 92% to 99%. The second solution was designed to solve the same problem for specimens with a thickness of less than 1 mm. Eight experimental tests were done (five using refractory materials) to verify the accuracy of the second solution, with the convergence in the results ranging from 94% to 97%. The relationships of the V_{rms} measured from the oscilloscope with the PTC and with the Fourier transform spectrum were derived. The results of this research were closer to the standard mechanical properties for refractory metals compared with several recent acoustic tests.

Original language | English |
---|---|

Pages (from-to) | 133-140 |

Number of pages | 8 |

Journal | Ultrasonics |

Volume | 55 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2015 |

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### Keywords

- Elastic modulus
- Pressure transmission coefficient
- Refractory metals and their alloys

### ASJC Scopus subject areas

- Acoustics and Ultrasonics

### Cite this

**Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals.** / Mohammed, Arshed Abdulhamed; Mohamed Haris, Sallehuddin; Nuawi, Mohd. Zaki.

Research output: Contribution to journal › Article

*Ultrasonics*, vol. 55, no. 1, pp. 133-140. https://doi.org/10.1016/j.ultras.2014.07.001

}

TY - JOUR

T1 - Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals

AU - Mohammed, Arshed Abdulhamed

AU - Mohamed Haris, Sallehuddin

AU - Nuawi, Mohd. Zaki

PY - 2015

Y1 - 2015

N2 - Refractory metals have attracted increasing interest in recent years because of their use in many high-temperature applications. However, the characteristics of these metals calculated using loaded tests (such as tensile strength tests) differ considerably from those calculated using one of the most famous methods in NDT which is called time of flying of the wave (TOF).The present study presents two solutions based on calculating the pressure transmission coefficient (PTC) of the transmitted wave between the test sample and magnesium metal. The first is based on the development of a highly accurate algorithm that lowers the cost by determining the acoustic impedance of the test specimen to calculating mechanical properties. Up to 26 theoretical tests were done (10 of these tests for refractory materials) according to their known mechanical properties to verify the accuracy of the algorithm. The convergence in results ranged from 92% to 99%. The second solution was designed to solve the same problem for specimens with a thickness of less than 1 mm. Eight experimental tests were done (five using refractory materials) to verify the accuracy of the second solution, with the convergence in the results ranging from 94% to 97%. The relationships of the Vrms measured from the oscilloscope with the PTC and with the Fourier transform spectrum were derived. The results of this research were closer to the standard mechanical properties for refractory metals compared with several recent acoustic tests.

AB - Refractory metals have attracted increasing interest in recent years because of their use in many high-temperature applications. However, the characteristics of these metals calculated using loaded tests (such as tensile strength tests) differ considerably from those calculated using one of the most famous methods in NDT which is called time of flying of the wave (TOF).The present study presents two solutions based on calculating the pressure transmission coefficient (PTC) of the transmitted wave between the test sample and magnesium metal. The first is based on the development of a highly accurate algorithm that lowers the cost by determining the acoustic impedance of the test specimen to calculating mechanical properties. Up to 26 theoretical tests were done (10 of these tests for refractory materials) according to their known mechanical properties to verify the accuracy of the algorithm. The convergence in results ranged from 92% to 99%. The second solution was designed to solve the same problem for specimens with a thickness of less than 1 mm. Eight experimental tests were done (five using refractory materials) to verify the accuracy of the second solution, with the convergence in the results ranging from 94% to 97%. The relationships of the Vrms measured from the oscilloscope with the PTC and with the Fourier transform spectrum were derived. The results of this research were closer to the standard mechanical properties for refractory metals compared with several recent acoustic tests.

KW - Elastic modulus

KW - Pressure transmission coefficient

KW - Refractory metals and their alloys

UR - http://www.scopus.com/inward/record.url?scp=84922717307&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922717307&partnerID=8YFLogxK

U2 - 10.1016/j.ultras.2014.07.001

DO - 10.1016/j.ultras.2014.07.001

M3 - Article

AN - SCOPUS:84922717307

VL - 55

SP - 133

EP - 140

JO - Ultrasonics

JF - Ultrasonics

SN - 0041-624X

IS - 1

ER -