Engineering and Technology Journal

Mathematical Model of Properties and Experimental Fatigue Investigation at Elevated Temperatures of Functionally Gradient Materials

Ziadoon M.R Al-hadrayi; Ahmed N. Al-Khazraji; Ahmed A. Shandookh

Volume 41, Issue 7 , July 2023, , Page 940-953

https://doi.org/10.30684/etj.2023.137509.1352

Abstract

Fatigue that occurs at elevated temperatures is called thermal fatigue. High temperatures and cycling loads cause thermal fatigue that can cause component failures. In this paper, induced ... Read More ... Fatigue that occurs at elevated temperatures is called thermal fatigue. High temperatures and cycling loads cause thermal fatigue that can cause component failures. In this paper, induced the mathematical models for functionally gradient materials and three models of functionally gradient materials (FGMs) manufactured by permanent casting were tested to predict their thermal fatigue life. FGMs have been tested to determine the effect of fatigue and temperature interactions. FGMs models were of FGM1, FGM2, and FGM3 respectively, with the following volume fractions and gradations: [100%Al-50%Al50%Zn-50%Zn50%Al-100%Zn], [100%Al-30%Zn70%Al-70%Zn30%Al-100%Zn] and [100%Al-70%Zn30%Al-30%Zn70%Al-100%Zn]. The experimental procedure presented the mechanical properties as modulus of elasticity at two levels of temperatures (80 oC, and 160 oC). Through the results of the tensile test at high temperatures, it was noted that the reduction percentage was high in the second type. This was especially for the yield strength value, where the percentage reached 43% at 160 °C. In the second type, the ultimate strength was affected more at 160 °C: the decrease percentage reached 33%, and the elastic modulus at the same temperature fell by 32%. The third type is the least affected at high temperatures, as the percentage of properties decrease at 160 °C reached 16, 17, and 16% for modulus of elasticity, ultimate strength, and yield strength, respectively. Fatigue strength is the most significant among the mechanical properties, where the highest value of the fatigue limit for the third type was experimentally 149.68 MPa. While the lowest value of fatigue strength was the second type, and at the same time, on the contrary, it was less affected at high temperatures, with a rate of 8%, which reached the decrease. The simulation results from the ANSYS program regarding fatigue at high temperatures were acceptable and gave reasonable variation ratios and were very close to the experimental results.

Nonlinear Finite Element Analysis of the Seismic Retrofitting of Existing Buildings

Shirin A. Abdulla; Mohammed J. Hamood; Mohammed A.E. Al Hamdani

Volume 39, Issue 6 , June 2021, , Page 915-927

https://doi.org/10.30684/etj.v39i6.1834

Abstract

Finite Element Analysis (FEA) is a helpful tool for finding solutions to civil engineering problems. In this paper, the numerical analysis was performed by simulating an experimental ... Read More ...

Behavior of Corbels Strengthened with Carbon Fiber Reinforced Polymers (CFRP) – Numerical Study

Sameh Badry Tobeia

Volume 32, Issue 10 , October 2014, , Page 2394-2407

https://doi.org/10.30684/etj.32.10A.7

Abstract

In this paper, a numerical modeling performed to study the effect of carbon fiber reinforced polymers (CFRP) as a shear strengthening of corbels. In this study a theoretical simulation ... Read More ...

Pulse Laser Parameters Effect on Tissue Thermal Damage Zone in Coagulation Process

Khalid Salem Shibib; Ayad Zwayen Mohammed; Kholood Hasan Salih

Volume 29, Issue 5 , March 2011, , Page 972-985

https://doi.org/10.30684/ etj.29.5.12

Abstract

Owed to wide use of pulsed lasers in a medical field, a deep understanding of their effects on the temperature increase in tissue and the subsequent tissue thermal damage in a coagulation ... Read More ...

Nonlinear Finite Element Analysis of Laterally Loaded Piles in Cohesive Sediments

Tahsin M. Toma

Volume 28, Issue 2 , January 2010, , Page 340-355

https://doi.org/10.30684/etj.28.2.12

Abstract

Laterally loaded single piles are usually analyzed by methods deriveddirectly from the classical beam on elastic foundation or Winkler soil model. Soilstrength is characterized using ... Read More ...

Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3

Mohammed Saeed. Waheed; Hassan Hamed. Abed

Volume 27, Issue 13 , September 2009, , Page 423-429

https://doi.org/10.30684/etj.27.13.19

Abstract

The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μmKeywordscomposite ... Read More ...

Analysis Up To Failure Of Straight And Horizontally Curved Composite Precast Beam And Cast-In-Place Slab With Partial Interaction

Husain M. Husain; Mohammed J. Hamood; Alaa Adnan Hafez

Volume 27, Issue 12 , September 2009, , Page 2277-2289

https://doi.org/10.30684/etj.27.12.4

Abstract

In this study, a nonlinear three-dimensional finite element analysis has beenused to predict the load-deflection behavior of horizontally curved compositebeams of concrete slab and ... Read More ...

Analysis Up To Failure of Straight and Horizontally Curved Composite Precast Beam and Cast-In-Place Slab with Partial Interaction

Husain M. Husain; Mohammed J. Hamood; Shaima; a Tariq Sakin

Volume 27, Issue 13 , September 2009, , Page 2509-2522

https://doi.org/10.30684/etj.27.13.18

Abstract

In this study, a nonlinear three dimensional finite element analysis has been used to conduct an analytical investigation on the behavior of curved in plan composite concrete-concrete ... Read More ...

Keywords = Finite element analysis

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