EFFECTS OF HEATING RATE ON THE THERMAL STRESS OF COMPOSITE PATCHES DURING CURING PROCESS

Abstract

Abstract: The heat-blanket thermal curing process of thermosetting resin matrix composite patch was simulated using the finite element method. The distribution and variation characteristics of temperature and thermal stress of the composite patch for different heating rates were analyzed, and the effects of heating rates on the residual thermal stress in the patch at different time points were studied. The results show that the thermal stress is mainly concentrated on the central region of the patch top surface and in its contact area with the mother plate during the heating stage, and the thermal stress in the internal area is higher than that at the patch top surface during the isothermal and cooling stage. The results also show that the faster the heating rate is, the faster the curing is. But, the greater the peak thermal stress is during the heating phase. And the value and distribution of thermal stress of the patch are independent of the heating rate during the isothermal and cooling stage. The results also indicate that the maximum value of the thermal stress appears at the end of the heating stage for the lower heating rate, while the maximum thermal stress appears near the end of the heating stage for higher heating rates. The research results provide the good numerical basis for selection of the heating rate to reduce the internal thermal stress and to control the delamination of the patch in the heating stage.

Key words: resin matrix composite, patch, heating rate, heat-blanket, curing process, thermal stress

CLC Number:

TB332

LI Shi-lin, CHEN Shu-xian, TIAN Qiu-shi, LIANG Zhen-yu. EFFECTS OF HEATING RATE ON THE THERMAL STRESS OF COMPOSITE PATCHES DURING CURING PROCESS[J]. Fiber Reinforced Plastics/Composites, 2018, 0(2): 58-65.

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