Journal
ENGINEERING FRACTURE MECHANICS
Volume 274, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2022.108781
Keywords
Damage model; Dynamic fracture; High strain rate; Ductile to brittle transition; Ti6Al4V
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Funding
- National Natural Science Foundation of China [52175420]
- Shandong Provincial Science Foundation for Excellent Young Scholars [2022HWYQ-059]
- Youth Talent Support Project of the Chinese Association for Science and Technology [YESS20210009]
- Taishan Scholar Program of Shandong Province [tsqn202103015]
- Fundamental Research Funds for the Central Universities [2021JCG009]
- Qilu Young Scholar Program of Shandong University
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This paper investigates the dynamic deformation and fracture mechanisms of Ti6Al4V over a wide strain rate range. A new rate-dependent material damage law is proposed, and the research shows the importance of developing appropriate damage evolution law to improve prediction accuracy of material deformation and guarantee structural design safety, especially for dynamic loading components.
Material damage and fracture behavior are affected by loading rates. This paper aims to investigate dynamic deformation and fracture mechanisms of Ti6Al4V over a wide strain rate range from quasi-static to 104 /s. A high strain rate test apparatus is developed and a new ratedependent material damage law is proposed. The damage energy of Ti6Al4V keeps nearly constant at the strain rate lower than 10 /s, while it declines dramatically under the strain rate high than 103 /s. Ductile to brittle transition of Ti6Al4V occurs at the strain rate of 16,000 /s, which leads to the transition of material fracture mechanism from adiabatic shear to embrittlement fracture. The research proves that developing appropriate damage evolution law is important to improve prediction accuracy of material deformation and guarantee structural design safety especially for dynamic loading components.
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