Discussion on essences of static resistance of two types of material  under penetration

CHENG Yihao; WANG Mingyang; WANG Derong; SONG Chunming; YUE  Songlin; TAN Yizhong

doi:10.11883/bzycj-2019-0443

Volume 40 Issue 6

Jun. 2020

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Article Navigation > Explosion And Shock Waves > 2020 > 40(6): 061101

CHENG Yihao, WANG Mingyang, WANG Derong, SONG Chunming, YUE Songlin, TAN Yizhong. Discussion on essences of static resistance of two types of material under penetration[J]. Explosion And Shock Waves, 2020, 40(6): 061101. doi: 10.11883/bzycj-2019-0443

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CHENG Yihao, WANG Mingyang, WANG Derong, SONG Chunming, YUE Songlin, TAN Yizhong. Discussion on essences of static resistance of two types of material under penetration[J]. Explosion And Shock Waves, 2020, 40(6): 061101. doi: 10.11883/bzycj-2019-0443

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Discussion on essences of static resistance of two types of material under penetration

doi: 10.11883/bzycj-2019-0443

1.
National Defense Engineering College, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Field Engineering College, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
3.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2019-11-19
Rev Recd Date: 2019-12-27

Available Online: 2020-04-25

Publish Date: 2020-06-01

Abstract

Abstract

Based on cavity expansion theories, the very essences of static target resistance, i.e. R_t of plastic and brittle materials are discussed by comparing the difference of dynamic behaviors in near region of penetration, and some suggestions about applications of brittle materials for penetration are given. The summary of discussion is shown as follows. Firstly, R_t is the mean and time-averaged stress on the cross section of the projectile, which is the resistance of target materials in solid state against local cavity expanding. The specific value of R_t varies withphysical and mechanical properties of materials, penetration models, impact velocity and other factors, and thus is not an intrinsic property of material. Secondly, for the non-deformable projectile penetrating plastic materials, static cavity expansion theory is proper to predict R_t. For semi-hydrodynamic penetration cases, the results of static cavity expansion theory should be modified. Thirdly, R_t of brittle materials mainly depends on fractured materials, while it is weakly related to intact materials and not completely positively related to uniaxial compressive strength of intact materials. If penetration velocity is relatively low, the strengthening effect of R_t of brittle materials by penetration velocity increasing should be considered in terms of internal-friction. If penetration velocity is high enough, the intrinsic and constant resistance of brittle materials is realized, which is named as dynamic hardness. Fourthly, the key measures to increase R_t of brittle materials are to reduce the amplitude of hoop tensile stress following the peak compressive stress, to lower the crack velocity of materials and to restrain the fragmentation degree of materials. These can be solved by increasing external confining pressure and intensifying the tensile strength and fracture toughness of materials. Furthermore, it is suggested that the dynamic properties of fractured materials should be emphasized to increase the precision of numerical calculations of brittle materials under penetration.
- penetration,
- plastic material,
- brittle material,
- static target resistance,
- Hugoniot elastic limit,
- dynamic hardness

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References

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