This work investigates the effect of the pre-firing temperature of andalusite aggregate(5-3 mm)on the conversion of andalusite,the volume stability,the thermal shock resistance and the slag resistance of Al2O3-SiC-C c...This work investigates the effect of the pre-firing temperature of andalusite aggregate(5-3 mm)on the conversion of andalusite,the volume stability,the thermal shock resistance and the slag resistance of Al2O3-SiC-C castables.The results show that the volume stability and the thermal shock resistance of the castables could be adjusted at different pre-firing temperatures of andalusite aggregates.There was no noticeable difference in the slag resistance between the specimens without andalusite and those with andalusite aggregate pre-fired at different temperatures.展开更多
预应变损伤及火灾高温对钢材力学性能的影响关乎钢结构的安全性。针对Q690D高强钢研究了预应变损伤高温耦合作用对其力学性能和破坏形态的影响,提出相应的非线性应力应变模型。试验采用两阶段试验方法(预应变损伤试验及高温试验、拉伸...预应变损伤及火灾高温对钢材力学性能的影响关乎钢结构的安全性。针对Q690D高强钢研究了预应变损伤高温耦合作用对其力学性能和破坏形态的影响,提出相应的非线性应力应变模型。试验采用两阶段试验方法(预应变损伤试验及高温试验、拉伸断裂准静态试验),并结合扫描电子显微镜(scanning electron microscope,SEM)分析微观断裂机理。试验结果表明,预应变损伤及高温氧化产生的应变时效导致钢材塑性变形能力下降,断裂形式以韧性断裂为主,并表现出准解理断裂特征。基于改进的Ramberg-Osgood本构模型,构建可描述高强钢在预应变损伤与高温耦合作用下的三阶段非线性应力应变模型,其中包含弹性变形阶段到塑性变形初始阶段、应变硬化阶段、颈缩阶段模型参数的确定。经验证,基于试验结果建立的应力应变模型与试验曲线吻合良好。展开更多
基金the National Natural Science Foundation of China (51572244 and U1604252, 51672255) for the financial supportpartly co-financed by Imerys Aluminates
文摘This work investigates the effect of the pre-firing temperature of andalusite aggregate(5-3 mm)on the conversion of andalusite,the volume stability,the thermal shock resistance and the slag resistance of Al2O3-SiC-C castables.The results show that the volume stability and the thermal shock resistance of the castables could be adjusted at different pre-firing temperatures of andalusite aggregates.There was no noticeable difference in the slag resistance between the specimens without andalusite and those with andalusite aggregate pre-fired at different temperatures.
文摘预应变损伤及火灾高温对钢材力学性能的影响关乎钢结构的安全性。针对Q690D高强钢研究了预应变损伤高温耦合作用对其力学性能和破坏形态的影响,提出相应的非线性应力应变模型。试验采用两阶段试验方法(预应变损伤试验及高温试验、拉伸断裂准静态试验),并结合扫描电子显微镜(scanning electron microscope,SEM)分析微观断裂机理。试验结果表明,预应变损伤及高温氧化产生的应变时效导致钢材塑性变形能力下降,断裂形式以韧性断裂为主,并表现出准解理断裂特征。基于改进的Ramberg-Osgood本构模型,构建可描述高强钢在预应变损伤与高温耦合作用下的三阶段非线性应力应变模型,其中包含弹性变形阶段到塑性变形初始阶段、应变硬化阶段、颈缩阶段模型参数的确定。经验证,基于试验结果建立的应力应变模型与试验曲线吻合良好。
