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通过试验的方法研究了双马来酰亚胺树脂浇注体及碳纤维增强树脂基复合材料单向层合板在不同温度下的静态力学性能,并讨论了温度对材料力学行为的影响,最后对材料断口形貌进行了分析.试验结果表明:纯树脂浇注体拉伸、压缩性能受温度影响比较明显,且拉、压性能不同.对于拉伸性能,相对室温均值(20℃),160℃环境下模量均值及强度均值降幅分别为31.73%,44.71%,200℃时又分别下降了21.15%,20.37%;对于压缩性能,相对室温均值,160℃下模量及强度均值分别下降了26.67%,44.40%,而200℃时继续下降了6.66%,12.40%.层合板的纵向拉伸性能受温度影响较小,在200℃内,纵向模量与强度最大变幅分别为2.82%和2.53%,且材料断口从室温下的“毛刷”状变为了沿轴向劈断.材料的横向及面内剪切性能受温度影响较大,且应力-应变曲线存在明显非线性,但横向试件断口平整、面内剪切试件无明显紧缩现象,即均表现为脆性断裂特征.另外,相对室温均值,在160℃时,横向及面内切变模量分别下降约32.96%,41.25%,强度分别下降约15.83%,30.96%;在200℃时,横向及面内剪切性能继续下降,模量降幅为16.83%,22.52%,强度降幅12.24%,11.01%.
The static mechanical properties of the bi-maleimide resin cast and carbon fiber reinforced resin-based unidirectional laminates at different temperatures were studied through experiments. The effect of temperature on the mechanical behavior of the material was also discussed. Finally, The results show that the tensile and compressive properties of the pure resin castings are obviously affected by the temperature, and the tensile and compressive properties are different. For the tensile properties, the relative average room temperature (20 ℃), 160 ℃ The mean value and the mean value of the intensity decreased by 31.73% and 44.71% respectively, and decreased by 21.15% and 20.37% respectively at 200 ℃. For the compressive properties, the average value of modulus and strength decreased by 26.67% and 44.40 respectively at 160 ℃ %, While it decreased by 6.66% and 12.40% respectively at 200 ℃. The longitudinal tensile properties of the laminate were less affected by the temperature. The maximum modulus and the maximum strength of the laminate were 2.82% and 2.53% respectively at 200 ℃ The fracture of the material changes from “brush” shape at room temperature to axial splitting. The transverse and in-plane shear properties of the material are greatly affected by temperature, and the stress-strain curve has obvious nonlinearity. However, Fracture smooth, in-plane shear specimen unknown In addition, at 160 ℃, the transverse and in-plane shear modulus decreased by about 32.96% and 41.25%, respectively, and their intensities decreased by about 15.83% and 30.96%, respectively; at At 200 ℃, the transverse and in-plane shear properties continue to decline. The modulus decreases are 16.83% and 22.52% respectively, and the strength decreases by 12.24% and 11.01% respectively.