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为了研究平纹机织玻璃纤维复合材料SW200/LWR-2的面内压缩力学性能并建立其本构模型,对其进行了应变率为0.001 s-1、0.1 s-1、500 s-1,温度从-55℃到100℃范围内的面内压缩实验研究。动态压缩实验在SHPB装置上进行,通过波形整形器实现了恒定应变率加载,且经过验证试样两端应力平衡。实验结果表明,SW200/LWR-2复合材料性能具有明显的应变率敏感性及温度敏感性,其强度随着应变率的升高而增大,随着温度的升高而减小。对破坏后试样进行宏观及微观观察发现,准静态加载时试样为剪切破坏,伴随大量纤维束内脱粘和纤维拔出;动态加载时试样为剪切破坏与分层破坏并存,并出现大量碎屑,纤维束为整束剪断,束内脱粘受到抑制。根据损伤力学理论,建立了SW200/LWR-2复合材料应变率及温度相关面内压缩损伤统计本构模型,本构模型结果与实验结果吻合较好。
In order to study the in-plane compressive mechanical properties of plain woven glass fiber composites SW200 / LWR-2 and to establish its constitutive model, the strain rate was 0.001 s-1, 0.1 s-1,500 s-1, In-plane Compression Experimental Study from -55 ℃ to 100 ℃. Dynamic compression experiments were performed on a SHPB device. Constant strain rate loading was achieved with a waveform shaper, and the stress balance across the sample was verified. The experimental results show that SW200 / LWR-2 composites have obvious strain rate sensitivity and temperature sensitivity. The strength of SW200 / LWR-2 composites increases with the increase of strain rate and decreases with the increase of temperature. After macroscopic and microscopic observation of the damaged sample, it was found that the specimens were shear failure with quasi-static loading, with a large number of fiber bundles within the debonding and fiber pull-out; dynamic loading of the specimen for shear failure and delamination coexist, And a large number of debris, fiber bundle for the whole bundle shear, bundle debonding is inhibited. According to the theory of damage mechanics, a statistical constitutive model of strain rate and temperature-dependent in-plane compressive damage of SW200 / LWR-2 composites is established. The constitutive model results agree well with the experimental results.