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高速侵彻时,弹靶之间发生强烈的局部作用,引起弹体头部发生质量侵蚀,从而影响弹体的侵彻性能。在弹体侵彻过程中,混凝土中的骨料对弹体的质量侵蚀有显著影响。本文通过对高速侵彻混凝土弹体的质量侵蚀实验数据进行分析,进一步分析讨论了混凝土骨料对弹体质量侵蚀的影响。将混凝土靶体视为骨料和砂浆基质混合的二相复合材料,引入混凝土骨料的体积分数χ和骨料的剪切强度τ1代替骨料的莫氏硬度H,给出无量纲骨料修正因子β,建立了修正的弹体质量损失工程模型。模型预测结果与现有的实验数据符合得很好,更准确地表征了混凝土骨料对弹体质量损失的影响。 相似文献
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In this work, a soliton mode-locked erbium-doped fiber laser(EDFL) with a high-quality molecular beam epitaxy(MBE)-grown topological insulator(TI) Bi_2Se_3 saturable absorber(SA) is reported. To fabricate the SA device, a 16-layer Bi_2Se_3 film was grown successfully on a 100 μm thick SiO_2 substrate and sandwiched directly between two fiber ferrules. The TI-SA had a saturable absorption of 1.12% and a saturable influence of 160 MW/cm~2.After inserting the TI-SA into the unidirectional ring-cavity EDFL, self-starting mode-locked soliton pulse trains were obtained at a fundamental repetition rate of 19.352 MHz. The output central wavelength, pulse energy,pulse duration, and signal to noise ratio of the radio frequency spectrum were 1530 nm,18.5 p J, 1.08 ps, and 60d Bm, respectively. These results demonstrate that the MBE technique could provide a controllable and repeatable method for the fabrication of identical high-quality TI-SAs, which is critically important for ultra-fast pulse generation. 相似文献
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