Fracture-surface topography analysis （FRASTA） was successfully used to simulate the process of crack and calculate parameters of crack such as the crack opening angle （COA） and crack-tip opening angle （CTOA）. Bu...Fracture-surface topography analysis （FRASTA） was successfully used to simulate the process of crack and calculate parameters of crack such as the crack opening angle （COA） and crack-tip opening angle （CTOA）. But because the amount of calculation is large, errors are often made during the course of calculation. FRASTA simulation software, namely fracture surface analyst （FSA ） is developed and a series of center-cracked tension （CCT） and double edge notched （DEN） specimens of different materials with different sizes are tested, their fracture surfaces are scanned by non-contact 319 scanning system and the elevation data of the fracture surfaces is recorded. FSA used the recorded elevation data of fracture surfaces to simulate the process of crack based on the principle of FRASTA. Results show that FSA can accurately simulate the process and calculate the parameters of crack.展开更多
传统基于夏比冲击韧性的双曲线止裂控制模型对于高钢级管道已不再适用,对能源安全输送造成巨大威胁。裂纹尖端张开角(Crack Tip Opening Angle,CTOA)作为具有前景的止裂韧性参数,有望取代夏比冲击韧性形成新的止裂控制方法,但目前相关...传统基于夏比冲击韧性的双曲线止裂控制模型对于高钢级管道已不再适用,对能源安全输送造成巨大威胁。裂纹尖端张开角(Crack Tip Opening Angle,CTOA)作为具有前景的止裂韧性参数,有望取代夏比冲击韧性形成新的止裂控制方法,但目前相关研究缺乏足够的进展与验证。为此,围绕基于实验室试样的CTOA标准化测试、CTOA测试结果的可转移性、基于CTOA的止裂控制方法3个方面对国内外研究进展进行了综述与剖析,指出当前各项研究存在的争议与不足,分析了后续研究的重点方向,以期推动中国管道止裂控制领域的研究进程及管道建设事业的发展。展开更多
文摘介绍了一种新的裂纹尖端张开角 (CrackTipOpeningAngle ,简称CTOA)的计算方法。利用联盟管道的有关数据及有限元分析 ,拟合得出了高韧性管材 (CTOA) C 与Charpy冲击韧性CV 非线性段的经验公式 ;用管材Charpy冲击韧性CV 试验结果计算得到的 (CTOA) C 与用DWTT试验结果的经验公式计算得到的 (CTOA) C 非常吻合。这为高韧性管材 (CTOA) C 的计算提供了新的方法 ,可对天然气管道断裂控制计划的制定提供参考。
文摘Fracture-surface topography analysis （FRASTA） was successfully used to simulate the process of crack and calculate parameters of crack such as the crack opening angle （COA） and crack-tip opening angle （CTOA）. But because the amount of calculation is large, errors are often made during the course of calculation. FRASTA simulation software, namely fracture surface analyst （FSA ） is developed and a series of center-cracked tension （CCT） and double edge notched （DEN） specimens of different materials with different sizes are tested, their fracture surfaces are scanned by non-contact 319 scanning system and the elevation data of the fracture surfaces is recorded. FSA used the recorded elevation data of fracture surfaces to simulate the process of crack based on the principle of FRASTA. Results show that FSA can accurately simulate the process and calculate the parameters of crack.
文摘传统基于夏比冲击韧性的双曲线止裂控制模型对于高钢级管道已不再适用,对能源安全输送造成巨大威胁。裂纹尖端张开角(Crack Tip Opening Angle,CTOA)作为具有前景的止裂韧性参数,有望取代夏比冲击韧性形成新的止裂控制方法,但目前相关研究缺乏足够的进展与验证。为此,围绕基于实验室试样的CTOA标准化测试、CTOA测试结果的可转移性、基于CTOA的止裂控制方法3个方面对国内外研究进展进行了综述与剖析,指出当前各项研究存在的争议与不足,分析了后续研究的重点方向,以期推动中国管道止裂控制领域的研究进程及管道建设事业的发展。
