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通过室温(20℃)及高温(180℃)静态拉伸及拉-拉疲劳试验,获得了2.5维树脂基机织复合材料在不同温度下的力学性能及拉-拉疲劳寿命。基于宏观试验,探讨了材料在静载及拉-拉疲劳载荷作用下的破坏模式和失效机理,对比了材料在疲劳载荷作用后的剩余强度与静强度的关系,之后分析了温度对材料静态力学性能及疲劳寿命的影响。结果表明:在20~180℃温度范围内材料的纬向模量对温度不敏感,但纬向强度及疲劳寿命随温度的升高而显著下降。在高温高应力水平(高于80%静强度)下材料的纬向疲劳寿命非常短(小于104次循环),但当应力水平仅下降2%后,材料的纬向疲劳寿命趋于106次循环。另外,高温下材料的剩余强度大于高温静强度。
The mechanical properties and pull-pull fatigue life of 2.5-dimensional resin-based woven composites at different temperatures were obtained by static tensile test and pull-pull fatigue test at room temperature (20 ℃) and high temperature (180 ℃) Based on the macroscopic test, the failure mode and failure mechanism of the material under static load and pull-pull fatigue load are discussed. The relationship between residual strength and static strength of the material after fatigue loading is compared. Then the influence of temperature on the static mechanics Effect of performance and fatigue life. The results show that in the temperature range of 20 ~ 180 ℃, the weft modulus of the material is not sensitive to temperature, but the weft strength and fatigue life decrease obviously with the increase of temperature. The latitudinal fatigue life of the material is very short (less than 104 cycles) at high temperature and high stress levels (above 80% static strength), but the latitudinal fatigue life of the material tends to 106 cycles after only a 2% reduction in stress level . In addition, the residual strength of the material at high temperature is greater than the static strength of high temperature.