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复合材料修理区域的超声检测
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作者 刘雨 夏张松 +1 位作者 宫兆斌 赵志鹏 《无损检测》 CAS 2024年第10期81-87,共7页
为了检验碳纤维增强聚合物基复合材料(CFRP)修理质量并对修理区分层等缺陷进行检测,制作了3种不同工艺[高温固化预浸料(PL2+PA2)修理、中温固化预浸料(PL1+PA1)修理、湿铺层(WF1+WR1)修理]的模拟修理试件,然后采用超声检测法对修理区进... 为了检验碳纤维增强聚合物基复合材料(CFRP)修理质量并对修理区分层等缺陷进行检测,制作了3种不同工艺[高温固化预浸料(PL2+PA2)修理、中温固化预浸料(PL1+PA1)修理、湿铺层(WF1+WR1)修理]的模拟修理试件,然后采用超声检测法对修理区进行检测评估,分别采用直探头、水浸点聚焦探头和滚轮探头对CFRP层压板修理区进行A扫描、B扫描和C扫描成像检测,最后对复合材料板进行拉伸破坏试验。试验结果表明,超声检测可以用来检测复合材料修理区域的分层缺陷;使用湿铺层修理(WF1+WR1)工艺修理的区域在超声检测时的声能吸收最小,其声学性能和原材料性能更接近,有利于超声检测;使用中温固化预浸料修理(PL1+PA1)工艺并采用小的挖补斜率时,材料强度恢复得更好。 展开更多
关键词 复合材料 修理区域 超声检测 声能吸收 滚轮探头
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A Metapopulation Model with Patches Distributed in Two Geographical Scales
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作者 Vanderlei Manica Jacques Aveline Loureiro da Silva 《Journal of Mechanics Engineering and Automation》 2014年第4期284-290,共7页
We propose a metapopulation model with two geographical scales. In a regional scale, the model describes the dynamics of a collection of habitats connected by migratory movements. In a local scale, we consider some gr... We propose a metapopulation model with two geographical scales. In a regional scale, the model describes the dynamics of a collection of habitats connected by migratory movements. In a local scale, we consider some granularity within each habitat, in the sense that each habitat is itself a collection of patches linked by dispersal. The whole ensemble can be seen as a metapopulation composed by local metapopulations. We analyze the synchronization of the model in the two geographical scales. We present an analytic criterion for synchronization where only the habitats in the regional scale evolve with the same dynamics. Through numerical simulations, we discuss the different synchronization modes. It depends on how the individuals are distributed in the local patches that compose a habitat after migration takes place in the regional scale. 展开更多
关键词 METAPOPULATION distribution matrix Lyapunov number.
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