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Locating the optimal microstructural state against dynamic perforation by evaluating the strain-rate dependences of strength and hardness
Wu, S. J.1,2; Qu, R. T.1,2,4; Liu, Z. C.3; Li, H. F.1,2; Wang, X. D.1; Tan, C. W.3; Zhang, P.1,2; Zhang, Z. F.1,2
Corresponding AuthorQu, R. T.(rtqu@nwpu.edu.cn) ; Tan, C. W.(tanchengwen@126.com) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
2021-06-01
Source PublicationINTERNATIONAL JOURNAL OF IMPACT ENGINEERING
ISSN0734-743X
Volume152Pages:13
AbstractIntense research efforts have been made to understand the variation of strength with strain rate, while the mechanisms governing the strain-rate dependence of hardness have been rarely studied. In this work, we conducted a comprehensive investigation on strength, hardness and failure mechanism of AISI 4340 steels with 4 different microstructural states in a wide range of loading rate. We found strain-rate hardening behavior in all 4 steels, while the degree of hardening, characterized by the normalized dynamic strength (NDS) or the normalized dynamic hardness (NDH), depends on not only materials but also loading modes. With the increase of material strength, the NDS significantly increases but the NDH decreases slightly. The inconsistency between the variations of NDS and NDH is because the hardness is governed by not only yield strength but strain-hardening ability. Although the yield strength increases as rising strain rate, the strain-hardening ability reduces obviously, particularly for high-strength materials due to shear softening under dynamic loading conditions, which also causes a transition from homogeneous deformation to shear fracture. The variations of NDS and NDH could reflect the trends for resisting not only the ductile perforation (strength limited) but also the shear plugging failure (toughness limited), allowing to propose a criterion for locating the optimal strength-toughness combination against dynamic perforation, which was further verified by the ballistic penetration testing results. Moreover, similar behaviors of NDS and NDH of various other alloys were also found, which may suggest the extensive applicability of the current approach.
KeywordDynamic hardness Dynamic strength Strain-rate hardening Dynamic perforation
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; LiaoNing Revitalization Talents Program
DOI10.1016/j.ijimpeng.2021.103856
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[51771205] ; LiaoNing Revitalization Talents Program[XLYC1808027]
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
WOS IDWOS:000633048500002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161864
Collection中国科学院金属研究所
Corresponding AuthorQu, R. T.; Tan, C. W.; Zhang, Z. F.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
4.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
Recommended Citation
GB/T 7714
Wu, S. J.,Qu, R. T.,Liu, Z. C.,et al. Locating the optimal microstructural state against dynamic perforation by evaluating the strain-rate dependences of strength and hardness[J]. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,2021,152:13.
APA Wu, S. J..,Qu, R. T..,Liu, Z. C..,Li, H. F..,Wang, X. D..,...&Zhang, Z. F..(2021).Locating the optimal microstructural state against dynamic perforation by evaluating the strain-rate dependences of strength and hardness.INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,152,13.
MLA Wu, S. J.,et al."Locating the optimal microstructural state against dynamic perforation by evaluating the strain-rate dependences of strength and hardness".INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 152(2021):13.
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