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蠕变试验室的技术改造 被引量:1
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作者 徐梅泉 何伟康 +1 位作者 朱月梅 陶志高 《理化检验(物理分册)》 CAS 2002年第4期164-166,共3页
为保证试验质量 ,提高试验过程的自动化水平和试验数据的可靠性 ,对金属材料高温强度试验室三大系统 ,即温度监控系统、试验机杠杆自动调平系统和试验数据处理系统进行了技术改造 。
关键词 温度监控 自动调平 数据处理 技术改造 金属材料 高温强度试验室 蠕变试验室 远程控制
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Investigation of meso-failure behavior of rock under thermal-mechanical coupled effects based on high temperature SEM 被引量:7
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作者 ZUO JianPing XIE HePing ZHOU HongWei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第10期1855-1862,共8页
It is extremely important to study and understand the deformation behavior and strength characteristics of rocks under thermal-mechanical (TM) coupling effects. Failure behavior and strength characteristics of Pingd... It is extremely important to study and understand the deformation behavior and strength characteristics of rocks under thermal-mechanical (TM) coupling effects. Failure behavior and strength characteristics of Pingdingshan sandstone were investigated at room temperatures up to 300℃ in an internally heated apparatus and tensile load through meso-scale laboratory experiments in this work. 33 experiments have successfully been conducted for Pingdingshan sandstone. Experimental results indicated that the tensile strength increased slowly with temperatures from 25℃ to 100℃, and then sharply jumped from 100℃ to 150℃, and finally decreased slightly with temperatures from 150℃ to 300℃. And about 150℃ is the threshold temperature of strength and thermal cracking. At low temperatures (25℃-150℃), sandstone strength is determined by relatively weak clay cement. However, at higher temperatures (150℃-300℃), because of the strength enhancement of clay cement, sandstone strength is controlled by both mineral particles and clay cement. The effects of cement clay, micro-cracks closing, and thermal cracking were the possible reasons for our detailed analysis. In addition, the typical fracture position maps and nominal stress-strain curves indicated that the temperature had strong effects on the failure mechanism of sandstone. The fractograph implied that the dominant fracture mechanism tended to transform from brittle at low temperatures to ductile at high temperatures. 展开更多
关键词 SANDSTONE thermal-mechanical (TM) effects MESO-SCALE tensile strength thermal cracking FRACTOGRAPHY
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