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Journal articles on the topic 'Dynamic temperature strain'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Hu, Zhiqiang, and Kaikun Wang. "Evolution of Dynamic Recrystallization in 5CrNiMoV Steel during Hot Forming." Advances in Materials Science and Engineering 2020 (January 9, 2020): 1–13. http://dx.doi.org/10.1155/2020/4732683.

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The dynamic recrystallization (DRX) behavior of 5CrNiMoV steel was investigated through hot compression at temperatures of 830–1230°C and strain rates of 0.001–10 s−1. From the experimental results, most true stress-strain curves showed the typical nature of DRX that a single peak was reached at low strains followed by a decrease of stress and a steady state finally at relatively high strains. The constitutive behavior of 5CrNiMoV steel was analyzed to deduce the operative deformation mechanisms, and the correlation between flow stress, temperature, and strain rate was expressed as a sine hype

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2

Mardoukhi, Ahmad, Jari Rämö, Taina Vuoristo, Amandine Roth, Mikko Hokka, and Veli-Tapani Kuokkala. "Effects of microstructure on the dynamic strain aging of ferriticpearlitic steels at high strain rates." EPJ Web of Conferences 183 (2018): 03009. http://dx.doi.org/10.1051/epjconf/201818303009.

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This paper presents an experimental study of the effects of dynamic strain aging on the mechanical behavior of selected high carbon and chromium-manganese steels in dynamic loading condition. In ferritic-pearlitic steels, the dynamic strain aging is typically caused by carbon, nitrogen, and possibly some other small solute atoms. Therefore, the thermomechanical treatments affect strongly how strong the dynamic strain aging effect is and at what temperature and strain rate regions the maximum effect is observed. In this work, we present results of the high temperature dynamic compression tests

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3

Luo, Fei, Cong Cai, Zhan Yuan Zhu, and Ling Zhi Cui. "The Effect of Negative Temperatures of Frozen Clay on Dynamic Strain Amplitude." Applied Mechanics and Materials 405-408 (September 2013): 2492–97. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2492.

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Authors studied variation characteristics of dynamic strain amplitude of frozen clay with different temperatures by MTS-810 vibration tri-axial material testing machine. Results show that the variability is carried by instrument errors, operation errors, and so on. The average values are used to eliminate the variability of test results. With the increasing of the load levels, dynamic strain amplitude increases gradually. Negative temperature has a lager influence on the variation characteristics of dynamic strain amplitude, however, the influence is smaller when temperature above freeze point

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4

Zhao, Enlai, Enyuan Wang, and Haopeng Chen. "Experiments on the Coal Measures Sandstone’s Dynamic Mechanical Parameter Characteristics under the Combined Action of Temperature and Dynamic Load." Applied Sciences 13, no. 24 (2023): 13125. http://dx.doi.org/10.3390/app132413125.

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This paper conducts impact dynamics experiments on coal measures sandstone in a deep mine via the established dynamic load and temperature split Hopkinson pressure bar (SHPB) experimental system. Firstly, the experimental conditions for the impact dynamics of fine sandstone were determined, with temperatures of 18, 40, 60, 80, and 100 °C, an axial static load range of 1–9 MPa, and a preset bullet incidence velocity of 1.0–5.0 m/s. Secondly, based on the analysis of the basic parameters and physical composition, the dynamic stress and strain responses of fine sandstone under different experimen

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5

Wang, Chun Yan, Hai Qun Qi, Kun Wu, and Ming Yi Zheng. "Deformation Behavior of ZK60 Magnesium Alloy at Elevated Temperature." Materials Science Forum 788 (April 2014): 93–97. http://dx.doi.org/10.4028/www.scientific.net/msf.788.93.

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The high temperature compressive tests of squeeze casting ZK60 magnesium alloy in the testing temperature range of 523-723K and strain rate range of 0.001-10s-1 were performed on Gleeble-1500D thermal simulator testing machine. Optical microscopy was performed to elaborate on the dynamic recrystallization (DRX) grain growth. TEM observation indicated that the mechanical twinning, dislocation slip, and dynamic recrystallization are the materials typical deformation features. Variations of flow behavior with deformation temperature as well as strain rate were analyzed. Analysis of the flowing de

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6

Long, M. J., H. H. Zhang, X. H. Yang, W. Guo, S. Y. Ai, and D. F. Chen. "Study on dynamic recrystallization of ultra-high strength 22MnB5 steel during hot rolling." Journal of Physics: Conference Series 2635, no. 1 (2023): 012022. http://dx.doi.org/10.1088/1742-6596/2635/1/012022.

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Abstract The effect of deformation temperature and strain rate on the recrystallization behavior of ultra-high strength hot formed 22MnB5 steel was systematically studied by isothermal compression experiments, and the microstructure was characterized and analyzed. The results show that the peak stress and peak strain of 22MnB5 steel decrease with increasing deformation temperature and increase with increasing strain rate. The dynamic recrystallization of 22MnB5 steel is more sensitive to temperature and less affected by strain rate. The recrystallization behavior is significant during isotherm

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7

Zhou, Ping, Wei Guo Guo, and Hai Hui Wu. "Plastic Flow Stress and Constitutive Model for H96 Brass Alloy." Applied Mechanics and Materials 782 (August 2015): 130–36. http://dx.doi.org/10.4028/www.scientific.net/amm.782.130.

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To explore the thermo-mechanical response of H96 brass alloy, the quasi-static (universal-testing machine) and dynamic (the split Hopkinson pressure bar apparatus) uniaxial compression experiments have been performed under the temperatures from 293 K to 873 K and the strain rates from 0.001 s-1 to 6000 s-1, and the strains over 60% are obtained. Results show that, H96 brass alloy has strong strain hardening behavior, and it becomes weaker with the increasing temperature. In addition, this alloy is sensitive to strain rates; and, it has temperature sensitivity, the dynamic strain aging occurs a

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8

Xiao, Jing, Iram Raza Ahmad, and D. W. Shu. "Dynamic behavior and constitutive modeling of magnesium alloys AZ91D and AZ31B under high strain rate compressive loading." Modern Physics Letters B 28, no. 08 (2014): 1450063. http://dx.doi.org/10.1142/s0217984914500638.

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The dynamic stress–strain characteristics of magnesium alloys have not been sufficiently studied experimentally. Thus, the present work investigated compressive dynamic stress–strain characteristics of two representative magnesium alloys: AZ91D and AZ31B at high strain rates and elevated temperatures. In order to use the stress–strain characteristics in numerical simulations to predict the impact response of components, the stress–strain characteristics must be modeled. The most common approach is to use accepted constitutive laws. The results from the experimental study of the response of mag

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9

ARAMOTO, TEPPEI, HIROSHI TACHIYA, AKIYOSHI HORI, AKIHIRO HOJO, and YUSUKE MIYAZAKI. "DYNAMIC TENSILE AND COMPRESSIVE STRESS-STRAIN CHARACTERISTICS OF MAGNESIUM ALLOYS AT ELEVATED TEMPERATURES." International Journal of Modern Physics B 22, no. 09n11 (2008): 1135–40. http://dx.doi.org/10.1142/s0217979208046438.

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The dynamic stress-strain characteristics of magnesium alloys have not been clarified sufficiently. Thus, the study investigated both the compressive and tensile dynamic stress-strain characteristics of representative magnesium alloys: AZ61A-F, ZK60A-T5 and AZ31B-F at wide strain rate and temperature ranges. About the strain rate dependency, the dynamic stresses are higher than the static ones under both compressive and tensile loads at elevated temperatures; however the dynamic stress-strain relations change slightly in the dynamic strain rate range. Thus, the magnesium alloys has little stra

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10

Ping, Qi, Mingjing Wu, Pu Yuan, Haipeng Su, and Huan Zhang. "Dynamic Splitting Experimental Study on Sandstone at Actual High Temperatures under Different Loading Rates." Shock and Vibration 2020 (June 22, 2020): 1–12. http://dx.doi.org/10.1155/2020/8867102.

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The tensile failure of rocks is a common failure mode in rock engineering. Many studies have been conducted on the tensile strength and failure mode of rocks after high-temperature treatment under dynamic loading. However, research on the effects of high temperature on the dynamic splitting tensile characteristics of sandstone at actual high temperatures is lacking. To investigate the dynamic tensile characteristics of rocks at actual high temperatures, split Hopkinson pressure bar (SHPB) test apparatus and high-temperature environment box were used to perform dynamic splitting tensile tests u

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11

Liu, Chuan Xiong, Yu Long Li, Bing Hou, Wei Guo Guo, and Jin Long Zou. "Dynamic Compressive Behavior of Concrete at High Temperatures." Advanced Materials Research 217-218 (March 2011): 1811–16. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1811.

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For investigating the effect of temperature on the dynamic properties of concrete material, tests for cylindrical concrete specimens at 23°C ~ 800°C were carried out by using Split Hopkinson Pressure Bar (SHPB) apparatus, and the strain rates ranged from 30/s to 220/s. Effects of temperature and strain-rate on the dynamic behavior of concrete were analyzed. The results show that: above 4000C, the dynamic compressive strength of concrete decreases with increasing temperature, and the enhancements of strain-rates on the compressive strength of concrete depend significantly on temperatures. Moreo

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12

Krumphals, Friedrich, Zeng Gao, Hassan Zamani, Stefan Mitsche, Norbert Enzinger, and Christof Sommitsch. "Physical and Numerical Simulations of the Microstructure Evolution in AA6082 during Friction Stir Processing by Means of Hot Torsion and FEM." Materials Science Forum 762 (July 2013): 590–95. http://dx.doi.org/10.4028/www.scientific.net/msf.762.590.

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A reproduction of the conditions occurring during friction stir processing, where a fine grained structure according to the process parameters rpm, transverse speed and pressure develops is the main focus in the present work. To physically simulate such a friction stir process, hot torsion tests at constant temperatures were carried out in a Gleeble ® 3800 machine at different strains and strain rates. The specimens were immediately water quenched after hot deformation to avoid any static recrystallization. The microstructure was investigated to characterize the grain size evolution and misori

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13

Dang, Kexin, Kehuan Wang, and Gang Liu. "Dynamic Softening and Hardening Behavior and the Micro-Mechanism of a TC31 High Temperature Titanium Alloy Sheet within Hot Deformation." Materials 14, no. 21 (2021): 6515. http://dx.doi.org/10.3390/ma14216515.

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TC31 is a new type of α+β dual phase high temperature titanium alloy, which has a high specific strength and creep resistance at temperatures from 650 °C to 700 °C. It has become one of the competitive candidates for the skin and air inlet components of hypersonic aircraft. However, it is very difficult to obtain the best forming windows for TC31 and to form the corresponding complex thin-walled components. In this paper, high temperature tensile tests were carried out at temperatures ranging from 850 °C to 1000 °C and strain rates ranging from 0.001 s−1 to 0.1 s−1, and the microstructures bef

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14

Hu, Hai Tao, Feng Zhao, Ying Gang Miao, Tao Suo, Qiong Deng, and Yu Long Li. "Dynamic Deformation Behavior of ECAPed AZ31 Magnesium Alloy." Applied Mechanics and Materials 566 (June 2014): 104–9. http://dx.doi.org/10.4028/www.scientific.net/amm.566.104.

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Equal channel angular pressing (ECAP) has been widely used for grain refinement in many alloys. In this article, the major emphasis was on the effect of grain size, temperature and strain rate on dynamic behavior of ECAPed AZ31. The dynamic mechanical properties of 6 pass and 8 pass ECAPed AZ31 were tested by split hopkinson pressing bar (SHPB) at wide temperatures range. At dynamic loading conditions, the ECAPed AZ31 shows strong strain hardening properties. The strain hardening rates decrease due to more slip systems’ opening with the increase of temperature. With the grain refinement, the f

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15

Matougui, Nedjoua, David Piot, Mohamed Lamine Fares, Frank Montheillet, and John Joseph Jonas. "The Avrami Kinetics of Dynamic Recrystallization in Nickel-Niobium Alloys." Materials Science Forum 941 (December 2018): 2264–69. http://dx.doi.org/10.4028/www.scientific.net/msf.941.2264.

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The flow curves determined on a series of Ni-Nb alloys are analysed. Six alloys containing Ni–0.01, 0.1, 1, 2, 5 and 10 wt. % Nb with pure Ni were tested in torsion at various strain rates within the hot forging temperature range. Under these conditions, large strains were attained, which permitted steady state flow to take place. The double-differentiation method is employed to define the critical strain for the initiation of DRX, leading to the evaluation of the strain hardening and dynamic recovery parameters. The relations obtained are compared to ones determined earlier using a least squa

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16

Perez-Martin, M. J., J. K. Holmen, S. Thomesen, O. S. Hopperstad, and T. Børvik. "Dynamic Behaviour of a High-Strength Structural Steel at Low Temperatures." Journal of Dynamic Behavior of Materials 5, no. 3 (2019): 241–50. http://dx.doi.org/10.1007/s40870-019-00206-x.

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Abstract The main objective of this experimental study is to determine the effect of low temperatures on the mechanical behaviour of Strenx 960 Plus high-strength structural steel at different strain rates and stress triaxialities. For this purpose, a comprehensive experimental campaign was designed to characterise the material at a wide range of temperatures and loading rates. The stress triaxiality was varied by testing specimens with different geometry. First, to determine the ductile-to-brittle transition temperature, instrumented Charpy V-notch impact tests were carried out at a range of

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17

Zhang, You Jing, Hong Nian Cai, Xing Wang Cheng, and Shuang Zan Zhao. "Dynamic Deformation Response of G33 Steel under High Temperature." Applied Mechanics and Materials 782 (August 2015): 61–70. http://dx.doi.org/10.4028/www.scientific.net/amm.782.61.

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The high temperature deformation and fracture behavior of ultra-high strength G33 steel under high strain rate compression are investigated by means of a split Hopkinson p ressure bar. Impact tests are performed at strain rates of 1000/s and 2200/s and at temperatures ranging from 25°C to 700°C. The SEM and TEM techniques are also used to analyze the microstructure evolution of the adiabatic shear band (ASB) and fracture characteristics of the deformed specimens at high temperature. The experimental results indicate that the flow stress of G33 steel is significantly dependent on temperatures a

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18

Yang, Shu Yu, Qiang Song Wang, Guo Liang Xie, Dong Mei Liu, and Fang Liu. "Thermal Deformation Behavior and Critical Conditions of Dynamic Recrystallization of QCr0.8 Alloy." Materials Science Forum 944 (January 2019): 38–45. http://dx.doi.org/10.4028/www.scientific.net/msf.944.38.

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In this paper, the flow stresses, the constitutive equation, processing map and the critical conditions of dynamic recrystallization (DRX) of the hot forged QCr0.8 alloy are studied by hot compressive test in the 750-900°C temperature and 0.01-10s-1 strain rate ranges using Gleeble-1500D thermo-mechanical simulator. The compression reduction of thermal compression deformation is 50%. The results show that the thermal deformation temperatures and strain rates have a significant effect on the high temperature deformation behavior of the alloy. The higher the temperature, the smaller the strain r

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19

Zhou, Jiayu, Zhaodong Xia, Dongfang Ma, and Huanran Wang. "Study of Dynamic Failure Behavior of a Type of PC/ABS Composite." Materials 17, no. 8 (2024): 1728. http://dx.doi.org/10.3390/ma17081728.

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PC/ABS composites are commonly used in airbag covers. In this paper, uniaxial tensile experiments of a PC/ABS composite at different temperatures and strain rates were conducted. The results showed that the temperature and loading rate affect the mechanical properties of the PC/ABS composite. As the temperature increases, the yield stress decreases and the strain at the moment of fracture increases, but the strain rate at the same temperature has a relatively small effect on the mechanical properties, which are similar to ductile materials. The experimental results were applied to the Abaqus m

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20

Mirone, Giuseppe, and Raffaele Barbagallo. "Modelling the influence of strain and strain rate on the thermal softening during dynamic loading of ductile metals." EPJ Web of Conferences 250 (2021): 02003. http://dx.doi.org/10.1051/epjconf/202125002003.

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Although the combined effect of strain rate and temperature on the behaviour of metals is widely recognized, no universally accepted viewpoints are available about the physical phenomena. Experiments on a highly ductile A2-70 steel, performed at moderate dynamic rates (10 s-1) and different initial temperatures (20 to 150 °C), are firstly aimed here at assessing whether the thermal softening previously verified at static rates on the same steel is also suitable for describing now the mixed effect of dynamic rates and consequent variable temperatures, or further contributions to the thermal sof

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21

Zhu, Zhi-Wu, Yue Ma, Hai-Dong Zhang, Wei-Dong Song, and Yuan-Chao Gan. "Evaluation of thermal effects and strain-rate sensitivity in frozen soil." Thermal Science 18, no. 5 (2014): 1631–36. http://dx.doi.org/10.2298/tsci1405631z.

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Temperature variation is one important factor that affects the dynamic mechanical properties of frozen soil under impact loading. Thermal damage is a collective phenomenon that can be caused by temperature variation. This paper investigates the effects of thermal damage on strain course. A split Hopkinson pressure bar was employed to investigate the dynamic mechanical characteristics of frozen soil at different temperatures and different strain rates. The stress-strain curves were obtained under impact loading. The compressive strength of frozen soil showed a negative temperature sensitivity a

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22

Tong, Ying, Guo Zheng Quan, Gang Luo, and Jie Zhou. "A Study on the Flow Behavior of 42CrMo Steel under Hot Compression by Thermal Physical Simulations." Advanced Materials Research 108-111 (May 2010): 494–99. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.494.

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This work was focused on the compressive deformation behavior of 42CrMo steel at temperatures from 1123K to 1348K and strain rates from 0.01s-1 to 10s-1 on a Gleeble-1500 thermo-simulation machine. The true stress-strain curves tested exhibit peak stresses at small strains, after them the flow stresses decrease monotonically until high strains, showing a dynamic flow softening. And the stress level decreases with increasing deformation temperature and decreasing strain rate. The values of strain hardening exponent n, and the strain rate sensitivity exponent m were calculated the method of mult

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23

Zhu, Zhan Yuan, Shi Jun Chen, Qiong Lin Li, Li Na Wang, and Feng Zhang. "Experimental Study of the Accumulation Dynamic Residual Strain of Ice under Rail Traffic Loading." Applied Mechanics and Materials 178-181 (May 2012): 1410–16. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1410.

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Based on dynamic tri-axial test at low temperature, deformation behavior of ice is studied under stepped axial cyclic loading. Time history curves of residual strain of ice are investigated under different negative temperatures and frequencies. Conclusions can be drawn as follows: dynamic residual strain rate increases with the increasing of stress ratio and frequency, while decreases with the decreasing of temperature. According to test data, power function is brought forward to fit the relation between stress ratio, negative temperature, frequency and dynamic residual strain rate. Then, the

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24

Ping, Qi, Chuanliang Zhang, Haipeng Su, and Hao Zhang. "Experimental Study on Dynamic Mechanical Properties and Energy Evolution Characteristics of Limestone Specimens Subjected to High Temperature." Advances in Civil Engineering 2020 (June 9, 2020): 1–12. http://dx.doi.org/10.1155/2020/8875568.

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To study the effect of high temperature on the dynamic mechanical properties and energy evolution characteristic of limestone specimens, the basic physical parameters of limestone specimens that cool naturally after experiencing high temperatures of room temperature (25°C), 200°C, 400°C, and 600°C were tested. In addition, compression tests with 6 impact loading conditions were conducted using SHPB device. The changes of basic physical properties of limestone before and after temperature were analyzed, and the relationship among dynamic characteristic parameters, energy evolution characteristi

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25

Li, Dong, Wei-Dong Zeng, Hao-Yuan Ma, Jian-Wei Xu, and Xiao-Bo Liang. "Evolution of Lamellar O Phase During Hot Compression in Ti₂AlNb-Based Alloy." Science of Advanced Materials 14, no. 4 (2022): 682–89. http://dx.doi.org/10.1166/sam.2022.4292.

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The dynamic spheroidization behavior of Ti2AlNb-based alloy with O lamellae during isothermal hot compression was investigated. The aspect ratio of lamellar O phase decreased at higher compression temperatures and lower strain rates, and more kinked or spherical O phases appeared. The results indicated that deformation conditions have a considerable effect on dynamic spheroidization behavior of Ti–22Al–25Nb alloy, and the correlation between spheroidization fraction and strain follows a Avrami-type sigmoid model. The strains for starting (εc) and finishing (εf) of the dynamic spheroidization d

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26

Ahmad, Iram R., Xiao Jing, and Dong W. Shu. "Effect of Temperature on the Dynamic Compressive Properties of Magnesium Alloy AZ91D." Key Engineering Materials 535-536 (January 2013): 133–36. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.133.

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Lightweight materials are getting more and more attraction towards their use in automobiles, planes, protective structures, electronics and supports for numerous benefits ranging from reduction in fuel consumption in vehicles to lighter and stronger in protective structures. For efficient use of materials in applications where they are subjected to unusual higher sudden loads and varying temperatures, it is necessary to know their accurate response under such conditions. Magnesium alloys due to low density, high specific strength, high specific stiffness and damping capacity have been in use f

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27

Huang, Zhen Yi, Fu Qiang Chen, and Ping Wang. "High-Temperature Deformation Characteristics of a SA516GR70 Vessel Steel." Advanced Materials Research 652-654 (January 2013): 1471–77. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1471.

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The single-directional and single-pass compression test were conducted on SA516GR70 vessel steel by a Gleeble-3500 thermal-mechanical simulator with the parameters of 800-1100 oC and 0.01-5 s-1. The influence of deformation temperatures and strain rates on the flow stress and the evolution of dynamic recrystallization of the observed steel were investigated. The results showed that the work hardening, dynamic recovery and dynamic recrystallization softening processes might be occurred successively or simultaneously with the strain increasing. The flow stress-strain curves for the compressed st

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28

Wang, Chun Yan, Kun Wu, and Ming Yi Zheng. "Compressive Deformation of ZK60 Magnesium Alloy at Elevated Temperature." Key Engineering Materials 353-358 (September 2007): 631–34. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.631.

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The high temperature compressive tests of squeeze casting ZK60 magnesium alloy with temperatures of 573-723K and strain rate in the range of 0.001-1s-1 were performed on Gleeble-1500D thermal simulator testing machine. Optical microscopy was performed to elaborate on the dynamic recrystallization (DRX) grain growth. TEM findings indicate that mechanical twinning, dislocation slip, and dynamic recrystallization are the materials typical deformation features. Variations of flow behavior with deformation temperature as well as strain rate were analyzed. Analysis of the flow behavior and microstru

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29

Wu, Horng Yu, Feng Jun Zhu, Chui Hung Chiu, Hsu Cheng Liu, and Cheng Tao Wu. "Flow Behavior and Microstructural Evolution of 316 Stainless Steel under Hot Compression." Advanced Materials Research 677 (March 2013): 188–91. http://dx.doi.org/10.4028/www.scientific.net/amr.677.188.

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Hot deformation characteristics of 316 stainless steel were investigated at elevated temperatures. Hot compressive tests were carried out in the temperature and strain rate ranges from 900 to 1100 °C and 1 × 10−1 to 1 s–1, respectively. Correlation between the flow behavior and the microstructural evolution was analyzed. The flow behavior showed that the softening mechanisms were related to the dynamic recovery (DRV), dynamic recrystallization (DRX), and grain growth. Flow behavior analyses and microstructural observations indicated that DRV was the major softening mechanism at high strain rat

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30

Guo, Wei Guo. "Dynamic Strain Aging during the Plastic Flow of Metals." Key Engineering Materials 340-341 (June 2007): 823–28. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.823.

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In the present paper, in order to better understand the third type “dynamic strain aging” occurring during the plastic flow of metals, the uniaxial compressive experimental data ever obtained in University of California, San Diego using an Instron servo-hydraulic testing machine and the Hopkinson technique are systematically analysed. These experimental data cover the plastic flow stress of several fcc, hcp, bcc polycrystalline materials and several alloys at a broad range of temperatures (77K – 1,100K) and strain rates (0.001/s – 10,000/s). In analysis, the appearing region of the “dynamic st

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31

Hao, Shi Ming, Jing Pei Xie, Li Ben Li, Ai Qin Wang, Wen Yan Wang, and Ji Wen Li. "Hot Deformation Behaviors and Microstructure Evolution of SiCp/Al Composites." Materials Science Forum 849 (March 2016): 430–35. http://dx.doi.org/10.4028/www.scientific.net/msf.849.430.

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In order to explore the compressive properties of aluminium matrix composite reinforced with middle content SiC particles, hot compression behavior of 30%SiCp/2024A1 composite was investigated using Gleeble-1500 system at a temperatures range from 350 to 500°C and strain rates from 0.01 to 10 s−1. The associated structural changes were studied by OM, SEM and TEM observations. The results show that the true stress–true strain curves exhibited a peak stress at a small strain (<0.1), after which the flow stresses decreased monotonically until high strains, showing a dynamic flow softening. The

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32

Huang, Guang Jie, Ling Yun Wang, Guang Sheng Huang, and Fu Sheng Pan. "Dynamic Recrystallization and Microstructure Evolution in AZ31 Magnesium Alloy during Thermomechanical Processing." Materials Science Forum 488-489 (July 2005): 215–18. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.215.

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The deformation behavior of AZ31 magnesium alloy has been investigated by isothermal compression at temperatures between 573-723K and at constant strain rates ranging from 10-3 -1s-1. It is shown that the form of flow stress curves is very sensitive to temperature and strain rate. In the experimental domain studied, the flow stresses are modeled using a power law with an average activation energy of 145.16 kJ/mol, and dynamic recrystallization (DRX) occurs. The critical strain for DRX is determined by analysis of flow stress curves. The ratio of the critical strain to the peak strain falls in

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33

Jonas, John J., Chiradeep Ghosh, and Vladimir V. Basabe. "Dynamic Transformation during Simulated Hot Rolling." Materials Science Forum 762 (July 2013): 1–8. http://dx.doi.org/10.4028/www.scientific.net/msf.762.1.

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High temperature flow curves were evaluated on two Nb steels in both compression and torsion and at a series of temperatures and strain rates. The critical strains for the initiation of dynamic transformation (DT) were determined by the double differentiation method. These are shown to be distinctly lower than those associated with dynamic recrystallization (DRX). It is also evident that the compression critical strains for both DT and DRX are lower than the equivalent torsion critical strains. Mean flow stresses (MFSs) were calculated by integration from the flow curves. When plotted against

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34

Xiong, L. X. "Uniaxial Dynamic Mechanical Properties Of Tunnel Lining Concrete Under Moderate-Low Strain Rate After High Temperature." Archives of Civil Engineering 61, no. 2 (2015): 35–52. http://dx.doi.org/10.1515/ace-2015-0013.

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AbstractTo investigate the mechanical properties of tunnel lining concrete under different moderate-low strain rates after high temperatures, uniaxial compression tests in association with ultrasonic tests were performed. Test results show that the ultrasonic wave velocity and mass loss of concrete specimen begin to sharply drop after high temperatures of 600 °C and 400 °C, respectively, at the strain rates of 10-5s-1 to 10-2s-1. The compressive strength and elastic modulus of specimen increase with increasing strain rate after the same temperature, but it is difficult to obtain an evident cha

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35

Luo, Hai Wen, Xu Dong Fang, Rui Zhen Wang, and Zhan Yin Diao. "Characteristics of Dynamic Recrystallization during Hot Deformation for High Nitrogen Stainless Steels." Materials Science Forum 715-716 (April 2012): 115–21. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.115.

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Dynamic recrystallization was studied for the stainless steels with nitrogen contents of 0.56% to 1.08% during hot deformation at temperatures of 900~1200 with strain rates ranging from 0.003 to 42 s-1. It was found that flow stress could increase remarkably with increasing nitrogen content. Flow curves during the deformation by 0.1~42/s at temperatures of 900~1200°C show a single peak, indicating the occurrence of dynamic recrystallization during deformation. The peak strain seems to decrease with increasing N content, suggesting that higher content of N facilitates dynamic recrystallization.

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Liu, Shuaiyang, Aiqin Wang, and Jingpei Xie. "Effect of Deformation Temperature, Strain Rate and Strain on the Strain Hardening Exponent of Copper/Aluminum Laminated Composites." Advanced Composites Letters 27, no. 4 (2018): 096369351802700. http://dx.doi.org/10.1177/096369351802700401.

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In order to investigate the strain hardening behaviour of Cu/Al laminated composites, isothermal compression tests were conducted in the temperature range of 300–450 °C and stain rate range of 0.01–1 s−1. Based on the experimental data, stain hardening exponent n was calculated to evaluate the strain hardening ability of Cu/Al laminated composites during the deformation process. The results show that deformation temperature, strain rate, strain and laminated structure are all responsible for the evolution of flow stress during the isothermal compression. The highly non-linear character of Ln σ

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Jonas, John J., and Vladimir V. Basabe. "Ferrite Formation Above the Ae₃ in a Medium-Carbon Steel." Solid State Phenomena 172-174 (June 2011): 372–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.372.

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A 0.45% C steel was deformed in torsion over the temperature range 762-872°C in a 5%H2-Argas atmosphere. Strains of 0.25-3.0 were applied at a strain rate of ε.= 4 s-1. The experimental parameters were varied in order to study the effects of strain and temperature on the formation of ferrite by dynamic transformation (DT) at temperatures above the Ae3. The critical strain for ferrite formation by DT was about 0.2 and its volume fraction increased with strain. The average ferrite grain sizes were about 1 to 2 µm and were fairly independent of temperature. It was observed that the deformation-in

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Chen, Hui Qin, Xiao Dong Zhao, Yue Sheng Chai, and Chun Xiao Cao. "Recovery and Recrystallization during Thermo-Mechanical Processing of Ti-6.5Al-1.5Zr-3.5Mo-0.3Si Alloy." Materials Science Forum 783-786 (May 2014): 549–55. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.549.

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In this investigation, microstructure evolution of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy during thermo-mechanical processing at temperatures in beta single-phase and alpha+beta two-phase fields was studied. Microstructure analyses indicate that: (1) in the beta single-phase field, dynamic recovery accompanied by geometric dynamic recrystallization at large strains takes place dominantly within elongated large prior beta grains with serrate grain boundaries during deformation at higher temperatures and lower strain rates; and discontinuous dynamic recrystallization occurs along elongated small prior

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Ping, Qi, Dezhi Qi, Qi Diao, Chuanliang Zhang, Qi Gao, and Yulin Wu. "Experimental Study on Physical and Dynamic Mechanical Properties of Temperature-Water Coupled Sandstone." Shock and Vibration 2021 (August 2, 2021): 1–12. http://dx.doi.org/10.1155/2021/6568436.

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In order to study the influence characteristics of water bath at different temperatures on rock physical and dynamic mechanical properties, a total of 15 groups of temperature-water bath treatment were carried out on coal mine roadway sandstone at 25°C∼95°C, and the basic physical parameters were tested. The impact compression test was carried out using the split Hopkinson pressure bar (SHPB) device. The results show that, with the increase of water bath temperature, the particle gap on the specimen surface increases. The volume, mass, and density of the specimens all increased with the increa

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Pang, Wei Wei, Guang Cai Zhang, Ai Guo Xu, and Ping Zhang. "Dynamic Fracture of Ductile Metals at High Strain Rate." Advanced Materials Research 790 (September 2013): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.790.65.

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Dynamic fracture of ductile metals at different strain rates and temperatures is studied via molecular dynamic simulations. The results show that both increase of temperature and decrease of strain rate reduce the yield strength, but the stress-strain curves separate prior to yield point at different temperatures. Both increase of temperature and strain rate shorten the duration of the stage of dislocation nucleation and slip. The stress-strain curves for various materials indicate that void nucleation needs not only lower yield strength but also lower fault energy. After the yield point, init

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Wang, Shiyu, Lihua Wen, Jinyou Xiao, Ming Lei, Xiao Hou, and Jun Liang. "The Out-of-Plane Compression Response of Woven Thermoplastic Composites: Effects of Strain Rates and Temperature." Polymers 13, no. 2 (2021): 264. http://dx.doi.org/10.3390/polym13020264.

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The dynamic mechanical response of high-performance thermoplastic composites over a wide range of strain rates is a challenging research topic for extreme environmental survivability in the field of aerospace engineering. This paper investigates the evolution of the dynamic properties of woven thermoplastic composites with strain rate and damage process at elevated temperatures. Out-of-plane dynamic-compression tests of glass-fiber (GF)- and carbon-fiber (CF)-reinforced polyphenylene sulfide (PPS) composites were performed using a split Hopkinson pressure bar (SHPB). Results showed that thermo

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Gordopolov, Yury A., Nail G. Zaripov, and Larissa V. Gordopolova. "Self-Propagating High-Temperature Synthesis, Dynamic/Quasi-Static Densification, and Superplasticity of Ceramics." Advances in Science and Technology 45 (October 2006): 933–38. http://dx.doi.org/10.4028/www.scientific.net/ast.45.933.

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The microstructure evolution during high-temperature deformation at (a) high strain rates and low strains (dynamic densification, shock compression) and (b) low strain rates and high strains (quasi-static densification, superplastic regime) was studied. Off-stoichiometric titanium carbide was selected as a testing system. The results demonstrate that high-temperature deformation in a broad range of strain rates provides means for controlling the microstructure of titanium carbide. By varying deformation conditions, one can obtain materials differing in microstructure and chemical composition,

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Huang, Xi Cheng, Wen Jun Hu, Yi Xia Yan, et al. "Temperature and Rate-Dependent Constitutive Relationship for Vanadium Alloy V-5Cr-5Ti and Failure Modes." Applied Mechanics and Materials 44-47 (December 2010): 2336–40. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2336.

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In this work the static and dynamic properties of vanadium alloy V-5Cr-5Ti over a wide range of temperature from 20 to 1000 degree at strain rates ranged from 10-4/s~103/s were studied experimentally under uniaxial quasi-static tension with MTS universal testing machine, uniaxial dynamic compression and tension with split Hopkinson bar system with temperature control. The stress-strain curves of V-5Cr-5Ti at various temperatures and various strain rates were obtained. Experimental data show that V-5Cr-5Ti behaves strain-rate sensitive and temperature dependent, for instance the material parame

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Lee, Woei-Shyan, Tao-Hsing Chen, Chi-Feng Lin, and Wen-Zhen Luo. "Dynamic Mechanical Response of Biomedical 316L Stainless Steel as Function of Strain Rate and Temperature." Bioinorganic Chemistry and Applications 2011 (2011): 1–13. http://dx.doi.org/10.1155/2011/173782.

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A split Hopkinson pressure bar is used to investigate the dynamic mechanical properties of biomedical 316L stainless steel under strain rates ranging from 1 × 103 s-1to 5 × 103 s-1and temperatures between25∘Cand800∘C. The results indicate that the flow stress, work-hardening rate, strain rate sensitivity, and thermal activation energy are all significantly dependent on the strain, strain rate, and temperature. For a constant temperature, the flow stress, work-hardening rate, and strain rate sensitivity increase with increasing strain rate, while the thermal activation energy decreases. Catastr

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Chandran, Sarath, Wenqi Liu, Junhe Lian, Sebastian Münstermann, and Patricia Verleysen. "Dynamic strain aging in DP1000: Effect of temperature and strain rate." Materials Science and Engineering: A 832 (January 2022): 142509. http://dx.doi.org/10.1016/j.msea.2021.142509.

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Wu, Peng, Lianying Zhang, Xianbiao Mao, et al. "Coupling Effect of Strain Rate and Freeze-Thaw Temperature on Dynamic Mechanical Properties and Fractal Characteristic of Saturated Yellow Sandstone." Geofluids 2021 (September 26, 2021): 1–14. http://dx.doi.org/10.1155/2021/7511467.

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Strain rate is not only an important influence factor for deformation property but also an important parameter for analyzing the dynamic mechanical behavior of rock material. In this study, the dynamic compressive mechanical properties of saturated yellow sandstone at four strain rates and six freeze-thaw temperatures are investigated by using the SHPB test system. The coupling effect of strain rate and freeze-thaw temperatures on the mechanical parameters of rock material are discussed in detail, and the relationship formula of peak strain and dissipated energy with strain rate and freeze-tha

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Zhang, Changming, Anle Mu, Yun Wang, and Hui Zhang. "Study on Dynamic Mechanical Properties and Constitutive Model Construction of TC18 Titanium Alloy." Metals 10, no. 1 (2019): 44. http://dx.doi.org/10.3390/met10010044.

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In order to investigate the static and dynamic mechanical properties of TC18 titanium alloy, the quasi-static stress–strain curve of TC18 titanium alloy under room temperature was obtained by DNS 100 electronic universal testing machine (Changchun Institute of Mechanical Science Co., Ltd., Changchun, China). Meanwhile, the flow stress–strain curves under different temperatures and strain rates are analyzed by split Hopkinson pressure bar (SHPB) device with synchronous assembly system. On the basis of the two experimental data, the JC constitutive model under the combined action of high tempera

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Chen, Tao-Hsing, Chih-Kai Tsai, and Te-Hua Fang. "Dynamic Shear Characteristic and Fracture Feature of Inconel 690 Alloy under Different High Strain Rates and Temperatures." Advances in Materials Science and Engineering 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/382503.

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The high strain shear rate behaviour of Inconel 690 alloy was investigated by using the split Hopkinson torsional bar. The shear strain rates were tested at 900 s−1, 1900 s−1, and 2600 s−1and at temperatures of −100°C, 25°C, and 300°C, respectively. It was found that the dynamic shear behaviour of Inconel 690 alloy was sensitive to strain rate and temperature. The fracture shear strain increased with increasing strain rate and temperature. In addition, the strain rate sensitivity was increased with increasing strain and strain rate but decreased with increasing temperature. Finally, the fractu

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Peng, Shuai, Zhenpeng Yu, Qi Zhao, et al. "Research on Dynamic Compressive Performance and Failure Mechanism Analysis of Concrete after High Temperature and Rapid Cooling." Materials 15, no. 13 (2022): 4642. http://dx.doi.org/10.3390/ma15134642.

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To investigate the dynamic compressive properties of concrete after high temperature and rapid cooling, an experimental study was carried out by considering five temperatures and four strain rates. The coupling effect of high temperature and strain rate on concrete damage morphology and mechanical parameters was comparatively analyzed. The main conclusions are as follows: the compressive damage morphology of concrete is affected by strain rate development trends of significant variability under different temperature conditions. As the strain rate increases, the compressive stress and elastic m

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Xia, Yu Feng, Shuai Long, Tian-Yu Wang, and Jia Zhao. "A Study at the Workability of Ultra-High Strength Steel Sheet by Processing Maps on the Basis of DMM." High Temperature Materials and Processes 36, no. 7 (2017): 657–67. http://dx.doi.org/10.1515/htmp-2016-0006.

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AbstractThe hot workability of the ultra-high strength steel BR1500HS has been investigated by processing maps. A series of hot deformation tensile tests were carried out on a Gleeble-3500 thermal simulator in the deformation temperature range of 773–1,223 K and strain rate range of 0.01–10 s–1. The obtained flow stress curves reveal that the peak stress increases with the rising of strain rate and decreases with the rising of temperature. Based on dynamic materials model (DMM), the processing maps at the strains of 0.05, 0.10 and 0.15 were developed, and the optimum hot working conditions wer

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