• Title/Summary/Keyword: Mechanical properties

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The Prediction and Control of Plate Mechanical Properties By the Analysis of Temperature History on ROT in Hot Strip Mill (열연 권취중 냉각이력 해석을 통한 재질예측 및 제어기술 개발)

  • Lee, J.H.;Kim, H.J.;Kim, Jae-Bu;Im, Y.R.;Lee, J.K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.111-113
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    • 2007
  • The Mechanical properties of steel in hot strip mill were associated with the alloy composition, plastic deformation, cooling history and so on. In the case of the same alloy composition and deformation conditions, cooling history on ROT (run out table) is the main factor in affecting mechanical properties of steel, especially, in carbon steel. On ROT, the steel undergoes under various kinds of cooling conditions such as radiation, convection by air, water and wetting zone. The coiling temperature (CT) of the steel is also important factor in affecting mechanical properties. But with the same CT, the mechanical properties of steel can be different because the temperature history of cooling is more important factor than CT itself. In this study, we have studied the relations between temperature history and mechanical properties of steel and then the predicted mechanical properties have compared with the measured values.

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Effect of Annealing Cycle of the Steel Sheet in the Mechanical Properties (박판의 풀림 사이클이 기계적 성질에 미치는 영향)

  • 김순경;이승수;전언찬
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.7
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    • pp.69-77
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    • 1998
  • Development on the mechanical properties of steel sheet for the automobile body panel is very important in the BAF(Batch annealing furnace) annealing process. Because of the heat treatment method in the BAF, mechanical properties were decided on the heat treatment method of the coil. So, we tested on the development of mechanical properties according to heat treatment method at the annealing furnace using the In atmospheric gas($H_2$ : 75%, $N_2$ : 25%) and the HNx atmospheric gas($H_2$ : 5%, $N_2$ : 95%) We confirmed the following characteristics, mechanical properties were changed under the influence of the annealing cycle and the atmospheric gas. And, we have some result according to heat treatment method. Elongation of the mechanical properties in the HNx BAF is higher than the Ax BAF. But tensile strength and hardness is higher than the HNx BAF.

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Effect of Cooling Rate on the Prediction of Mechanical Properties of Al Alloys (알루미늄 합금 주물의 냉각 속도에 따른 기계적 성질 예측)

  • Dong, Quan-Zhi;Cho, In-Sung;Hwang, Ho-Young
    • Journal of Korea Foundry Society
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    • v.32 no.5
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    • pp.225-230
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    • 2012
  • In this study, a more practical and simulation approach which can predict the mechanical properties of aluminum alloys is proposed. First, cooling rate, micro-structure, and mechanical properties of casting product were measured through casting experiment. The relation between cooling rate and SDAS decrease exponentially and the linearly decreasing relation exist between SDAS and mechanical properties. Then, the cooling rate was calculated by casting process simulation and the mechanical properties were predicted by using the relations that were derived through experiment. Experimentally measured mechanical properties and predicted values by simulation were in the range of relatively small difference. The mechanical properties of various Al alloys are expected to be predicted by the casting process simulation before actual casting.

Studies on the Correlation between Mechanical Properties and Ultrasonic Parameters of Aging 1Cr-1Mo-0.25V Steel

  • Seok Chang-Sung;Kim Jeong-Pyo
    • Journal of Mechanical Science and Technology
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    • v.19 no.2
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    • pp.487-495
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    • 2005
  • Mechanical properties of in-service facilities are required to evaluate the integrity of power plants and chemical plants. Non-destructive technique can be used to evaluate the mechanical properties. To investigate the mechanical properties using ultrasonic technique, the four classes of thermally aged specimens were prepared using an artificially accelerated aging method. Ultrasonic tests, tensile tests, fracture toughness tests, and hardness tests were performed for the specimens. Then the mechanical properties were compared with ultrasonic parameters such as attenuation and non-linear parameter. From the investigation, we confirm that the ultrasonic parameter can be used to evaluate the mechanical properties.

Statistical variations in the impact resistance and mechanical properties of polypropylene fiber reinforced self-compacting concrete

  • Mastali, M.;Dalvand, A.;Fakharifar, M.
    • Computers and Concrete
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    • v.18 no.1
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    • pp.113-137
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    • 2016
  • Extensive experimental studies on remarkable mechanical properties Polypropylene Fibre Reinforced Self-compacting Concrete (PFRSCC) have been executed, including different fibre volume fractions of Polypropylene fibers (0.25%, 0.5%, 0.75%, and 1%) and different water to cement ratios (0.21, 0.34, 0.38, and 0.41). The experimental program was carried out by using two hundred and sixteen specimens to obtain the impact resistance and mechanical properties of PFRSCC materials, considering compressive strength, splitting tensile strength, and flexural strength. Statistical and analytical studies have been mainly focused on experimental data to correlate of mechanical properties of PFRSCC materials. Statistical results revealed that compressive, splitting tensile, and flexural strengths as well as impact resistance follow the normal distribution. Moreover, to correlate mechanical properties based on acquired test results, linear and nonlinear equations were developed among mechanical properties and impact resistance of PFRSCC materials.

Mechanical Properties of the Apple Flesh According to the Specimen Size

  • Kim, M.S.
    • Agricultural and Biosystems Engineering
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    • v.1 no.1
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    • pp.43-48
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    • 2000
  • Mechanical properties of the apple flesh were tested with compression test apparatus constructed by this study. The computer program was developed for measuring mechanical properties, and analyzing data obtained from the study. Compression tests on the apple flesh were performed at four levels of specimen diameter, three levels of specimen length, and at constant loading rate(25mm/min). Five replications were made at each treatment combination. Effect of specimen size on the mechanical properties of the apple flesh was investigated.

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A Study on the Estimating the Mechanical Properties of Three-Layer Particleboard (3층(層) 파티클보드의 기계적(機械的) 성질(性質) 예측(豫測)에 관(關)한 연구(硏究))

  • Park, Hee-Jun;Lee, Phil-Woo;Chung, Ju-Sang
    • Journal of the Korean Wood Science and Technology
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    • v.21 no.4
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    • pp.64-72
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    • 1993
  • Mechanical properties of 15 mm thick, three-layer particleboard were studied by varying resin content, specific gravity, mat moisture content, pressing time and pressing temperature. Based on the results of the study, Multiple regression models were developed to estimate the mechanical properties of three-layer particleboard. The results of this study showed the mechanical properties of particleboard were highly related with resin content. specific gravity and mat moisture content in decending order. The mechanical properties were able to estimated as the linear function of resin content and specific gravity. However, the effects of change in mat moisture content on the mechanical properties showed a non-linear pattern. The mechanical properties curves over mat moisture content reached peaks at 15 %, and then decreased at 18 % and 21 % of mat moisture contents. On the other hand, the effects of pressing time and pressing temperature on the mechanical properties of particleboard were not significant.

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Study on the Mechanical Properties of Laser Welded AZ31 Magnesium Alloy (AZ31 마그네슘 합금 레이저 용접부의 기계적 성질에 관한 연구)

  • Lee, M.Y.;Jeong, B.H.;Jeong, S.M.;Park, H.J.
    • Laser Solutions
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    • v.9 no.1
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    • pp.25-29
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    • 2006
  • This study aimed to investigate the change of mechanical properties with the rolling direction and shielding condition during laser welding of AZ31 magnesium alloy. AZ31 magnesium alloy sheets of 1mm thickness were welded using a continuous wave Nd:YAG laser with and without Ar shielding gas. The effect of Ar shielding gas and rolling direction on the mechanical properties were investigated using Vickers hardness, transverse-weld tensile. Porosity in the weld metals was investigated using an optical microscope. The experimental results showed that mechanical properties of AZ31 magnesium alloy laser welds were upgraded compared to those of base metal. Mechanical properties of AZ31 magnesium alloy laser welds were not substantially changed when Ar shielding gas was supplied.

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Effect of the Coarse Aggregate Volume by High Temperature Mechanical Properties of Ultra High Strength Concrete (굵은골재의 용적이 초고강도 콘크리트의 고온역학적특성에 미치는 영향)

  • Hwang, Eui-Chul;Kim, Gyu-Yong;Choe, Gyeong-Cheol;Yoon, Min-Ho;Lee, Bo-Kyeong;Kim, Jung-Hyun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.67-68
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    • 2015
  • Recently, usage of ultra-high strengh concrete(UHSC) have been increased. Concrete has been recognized as a material which is resistant to high temperatures, but chemicophysical property of concrete is changed by the high temperature. So, mechanical properties of concrete may be reduced. Therefore, this study evaluated effect of the coarse Aggregate volume by high temperature mechanical properties of UHSC. Residual mechanical properties are evaluated under fine aggregate ratio 40,60% and 500℃ temperature on UHSC of W/B 15, 20%. As result, residual mechanical properties of UHSC are high by lower coarse aggregate volume.

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Effect of Phosphorous Acid Concentration on Mechanical Properties of Ni-P Electrodeposits (니켈-인 도금 층의 기계적 성질에 미치는 아인산 농도의 영향)

  • Kang, Soo Young;Yang, Seung gi;Hwang, Woon suk
    • Journal of the Korean institute of surface engineering
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    • v.48 no.3
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    • pp.100-104
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    • 2015
  • The nickel alloys gets a great deal of attention due to their good mechanical, chemical and magnetic properties. Especially Ni-P alloy systems are very attractive due to their good corrosion resistance and the wear resistance in important technological applications. In this study, the effects of phosphorus acid concentration in plating solution on composition of Ni-P alloy coatings were studied. The Ni-P electrodeposits of the various P contents were investigated in order to understand effect of the composition on mechanical properties of Ni-P electrodeposits. The mechanical properties of electrodeposits increased as the P content in electrodeposits increase. The results of mechanical properties were explained by grain size and P solid solution effect. The effects of heat treatment on mechanical properties of Ni-P alloy coatings were also studied.