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TiC颗粒强化钛基复合材料的强度评估 被引量:7
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作者 张廷杰 曾泉浦 +1 位作者 毛小南 张小明 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 1999年第5期265-268,共4页
根据TiC颗粒强化铁基复合材料的显微组织观察,按照复相材料的强化理论估计了TiC增强体粒子的加入对钛基体的模量强化和基体强化作用,接材料屈服准则估计了复合材料的屈服强度共同试验结果进行了比较。
关键词 钛基 复合材料 屈服强度 模量强化 碳化硅
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拉压性能不同金属材料的非经典塑性本构理论及实验研究 被引量:3
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作者 吕桂英 张泽华 《力学学报》 EI CSCD 北大核心 1989年第S1期70-77,共8页
本文首次在拉压性能不同金属材料中发展了平均应力敏感和塑性体积变化的非经典塑性本构理论,从理论和实验两个方面比较深入、系统和全面地探讨了拉压性能不同的金属材料的塑性体积变化、屈服、强化和流动等塑性行为,建立了一套完整的本... 本文首次在拉压性能不同金属材料中发展了平均应力敏感和塑性体积变化的非经典塑性本构理论,从理论和实验两个方面比较深入、系统和全面地探讨了拉压性能不同的金属材料的塑性体积变化、屈服、强化和流动等塑性行为,建立了一套完整的本构方程。根据本文对铝硅合金ZLl05和球墨铸铁的实验结果给出了各种应力状态下强化曲线的经验公式, 比较合理地解决了塑性强化模量应依应力状态的变化规律问题。将本文的本构模型与实验结果比较, 两者十分吻合。 展开更多
关键词 非经典塑性本构方程 平均应力 塑性体积变化 塑性强化模量
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Stress evolution of deep surrounding rock under characteristics of bi-modulus and strength drop 被引量:5
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作者 CHEN Shao-jie ZHAO Zeng-hui +1 位作者 FENG Fan ZHANG Ming-zhong 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期680-692,共13页
Aiming at the circular chamber under uniform stress field in deep energy storage and mining,analytical solutions of stress and plastic zone of the surrounding rock under different far-field stress and internal pressur... Aiming at the circular chamber under uniform stress field in deep energy storage and mining,analytical solutions of stress and plastic zone of the surrounding rock under different far-field stress and internal pressure were derived based on bi-modulus theory and the elastic-brittle-ideal plastic constitutive model.Evolution trend of the elasticplastic stress and plastic region with different elastic constant ratios and residual strength coefficients were analyzed in details.Results revealed that when the internal pressure was small,the three-direction principal stress was compressive stress and the stress field distribution of the surrounding rock was not affected by the moduli difference.The obtained solution was consistent with the solution from the elastic-brittle plastic drop model under the equal modulus theory.On the other hand,when the internal pressure was large,the tangential stress was changed.The surrounding rock can be divided into three zones,i.e.,tensile plastic zone(TPZ),tensile elastic zone(TEZ)and compressive elastic zone(CEZ).The tensile and compressive dual modulus had significant influence on the demarcation point between TEZ and CEZ.In addition,the strength drop and the dual modulus characteristic had a coupling effect on the stress distribution in the surrounding rock.The related achievements further enrich the theory of deep rock mechanics. 展开更多
关键词 deep surrounding rock bi-modulus strength drop stress evolution
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Evaluation of straightening capacity of plate roll straightener 被引量:1
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作者 王勇勤 刘志芳 严兴春 《Journal of Central South University》 SCIE EI CAS 2012年第9期2477-2481,共5页
Straightening machine is widely used for improving the quality of the defective mild steel plates.In general,the capacity of straightening machine is affected by material properties,the initial shape of the incoming p... Straightening machine is widely used for improving the quality of the defective mild steel plates.In general,the capacity of straightening machine is affected by material properties,the initial shape of the incoming plate and the plastic ratio.The mechanics model describing the capacity of the machine was developed.The deviation of the straightening capacity curves was studied.Then,the presented model was evaluated by comparative study to filed production data.Finally,the influences of overstretch,straightening speed,strengthening coefficient,elastic modulus,width of the plate on the straightening capacity were studied.It is convenient to determine whether the plate can be straightened or not by a series of straightening capacity curves.The straightening speed,width of the plate and elastic modulus of the material are more sensitive to the straightening capacity than the strengthening coefficient. 展开更多
关键词 plastic ratio straightening capacity strengthening factor PLATE
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Simplification and improvement of prediction model for elastic modulus of particulate reinforced metal matrix composite
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作者 王文明 《Journal of Chongqing University》 CAS 2006年第4期187-192,共6页
In this paper, we proposed a five-zone model to predict the elastic modulus of particulate reinforced metal matrix composite. We simplified the calculation by ignoring structural parameters including particulate shape... In this paper, we proposed a five-zone model to predict the elastic modulus of particulate reinforced metal matrix composite. We simplified the calculation by ignoring structural parameters including particulate shape, arrangement pattern and dimensional variance mode which have no obvious influence on the elastic modulus of a composite, and improved the precision of the method by stressing the interaction of interfaces with pariculates and maxtrix of the composite. The five- zone model can reflect effects of interface modulus on elastic modulus of composite. It overcomes limitations of expressions of rigidity mixed law and flexibility mixed law. The original idea of five zone model is to put forward the particulate/interface interactive zone and matrix/interface interactive zone. By organically integrating the rigidity mixed law and flexibility mixed law, the model can predict the engineering elastic constant of a composite effectively. 展开更多
关键词 particulate reinforced metal matrix composite elastic modulus prediction model five-zone model
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Effects of oxidation treatment on properties of SiO_(2f)/SiO_2-BN composites 被引量:1
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作者 LI Duan ZHANG Chang-rui +4 位作者 LI Bin CAO Feng WANG Si-qing YANG Bei LIU Kun 《Journal of Central South University》 SCIE EI CAS 2012年第1期30-35,共6页
The silica fiber reinforced silica and boron nitride-based composites (SiO2f/SiO2-BN) were prepared firstly via the sol-gel method and then the urea route, and the effects of oxidation treatment on the component, st... The silica fiber reinforced silica and boron nitride-based composites (SiO2f/SiO2-BN) were prepared firstly via the sol-gel method and then the urea route, and the effects of oxidation treatment on the component, structure, mechanical and dielectric properties of the composites were investigated. The results show that the oxidation treatment at 450 ℃ will not impair the structure of boron nitride, and carbon is the main impurity with the excessive urea. The density of SiO2f/SiO2-BN composites is 1.81 g/cm3, and the flexural strength and elastic modulus are 113.9 MPa and 36.5 GPa, respectively. After oxidation treatment, the density varies to 1.80 g/cm3, and the flexural strength and elastic modulus are decreased to 58.9 MPa and 9.4 GPa, respectively. The mechanical properties of the composites are severely damaged, but they still exhibit a good toughness. The composites show excellent dielectric properties with the dielectric constant and loss tangent being 3.22 and 0.003 9, respectively, which indicates that the oxidation treatment is ineffective to improve the dielectric properties of SiOzf/SiO2-BN composites. 展开更多
关键词 RADOME boron nitride urea route COMPOSITES oxidation treatment wave-transparent structure mechanical properties dielectric properties
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Neuro-fuzzy systems in determining light weight concrete strength
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作者 Seyed Vahid RAZAVI TOSEE Mehdi NIKOO 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第10期2906-2914,共9页
The adaptive neuro-fuzzy inference systems(ANFIS)are widely used in the concrete technology.In this research,the compressive strength of light weight concrete was determined.To this end,the scoria percentage and curin... The adaptive neuro-fuzzy inference systems(ANFIS)are widely used in the concrete technology.In this research,the compressive strength of light weight concrete was determined.To this end,the scoria percentage and curing day variables were used as the input parameters,and compressive strength and tensile strength were used as the output parameters.In addition,100 patterns were used,70%of which were used for training and 30%were used for testing.To assess the precision of the neuro-fuzzy system,it was compared using two linear regression models.The comparisons were carried out in the training and testing phases.Research results revealed that the neuro-fuzzy systems model offers more potential,flexibility,and precision than the statistical models. 展开更多
关键词 neuro-fuzzy systems compressive strength light weight concrete linear regression model
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