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T300/LD2复合材料在热循环时产生滞后环并留下很大的残留应变。本文对T300/LD2试样在热循环时产生滞后环和残留应变的原因进行分析和探讨。实验结果表明,基体在热循环时大量的塑性变形是产生滞后环和残留应变的主要原因,并通过在界面预设不同应力和缩短热循环温度区间来研究界面应力状态和热循环温度区间跟热循环时滞后环和残留应变之间的关系。提出了改善残留应变和滞后的方法(1)尽量减少复合材料的使用环境中的温度变化,(2)根据材料的使用环境,经过各种预处理使复合材料在工作时基体处于弹性变形状态,(3)提高基体的屈服强 度。
The T300 / LD2 composite creates a hysteresis loop during thermal cycling and leaves a large residual strain. In this paper, the causes of the hysteresis loop and residual strain of T300 / LD2 sample during thermal cycling are analyzed and discussed. The experimental results show that a large amount of plastic deformation of the substrate during thermal cycling is the main reason for the generation of hysteresis loop and residual strain. The interface stress state and the thermal cycling temperature range are studied by presetting different stresses at the interface and shortening the thermal cycling temperature range Relationship between post-lag ring and residual strain. (1) Minimize the temperature change in the environment of the composite material; (2) According to the environment of the material, after a variety of pretreatments, the matrix in the composite material is in an elastic deformation state, (3) to improve the yield strength of the substrate.