摘要
The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a wide range of film/coating materials with different ratios in term of the Young’s modulus and yield strength were examined, namely different values of Ef/Esand Yf/Es.Based on these scaling relationships, the substrate effects on indentation response and deformed surface profile of residual imprint are given. Furthermore, the scaling relationship among the work of indentation, reduced elastic modulus and hardness has been found. It is found that the ratio of the indentation hardness to measurement of substrate elastic modulus could be used to characterize the wear resistance of film/coating materials. In addition, a novel method to acquire the intrinsic hardness and elastic modulus of film/coating materials is proposed combined with the well-known 10% critical indentation depth rule, which avoids the error caused by estimating the contact area. This work could be contributed for characterizing the mechanical properties of film/coating materials at micro-and nanoscale.
基金
the National Science Fund for Distinguished Young Scholars(Grant No.51925504)
the National Key R&D Program of China(Grant No.2018YFF01012400)
the National Science and Technology Innovation Leading Academic(Ten Thousand Talent Program)
the National Defense Science and Technology Bureau Project(Grant No.JSJL2018110A001)
the Pre-research of Equipment of the General Armaments Department(Grant No.41422050301)
the Graduate Innovation Fund of Jilin University(Grant No.101832020CX103)。
