Abstract
The polymethyl methacrylate (PMMA) subjected to hygrothermal aging was applied to nanoindentation tests under different indentation strain rates. The influences of hygrothermal aging on the indentation behaviors of PMMA are discussed. Results show that the indentation elastic modulus and hardness decrease with increasing aging time. Furthermore, the indentation size effects (ISE) can be observed in aged PMMA specimens as they are sensitive to aging time as well as to the indentation strain rate. The quantitative analysis of ISE is proposed on the basis of shear transformation-mediated plasticity and was presented in our companion paper.
Highlights
Polymethyl methacrylate (PMMA) is extensively applied in different industrial areas, such as aircraft, automotive industries, and biomedical materials, for its excellent properties [1,2,3,4,5,6]
This paper aimed to study the indentation behavior of aged polymethyl methacrylate (PMMA)
This paper focuses on the experimental results of aged PMMA under indentation with different strain rates, and the related theoretical analysis and modeling are displayed in our companion paper
Summary
Polymethyl methacrylate (PMMA) is extensively applied in different industrial areas, such as aircraft, automotive industries, and biomedical materials, for its excellent properties [1,2,3,4,5,6]. For these widely used materials, mechanical strength is the first and foremost characteristic to ensure safety [7,8,9,10,11,12]. The mechanical behaviors of PMMA under combined stress states always differ to that under uniaxial loading because of the introduction of additional shear stress. The yielding and failure of PMMA are sensitive to shear stress, i.e., the introduced shear stress decreases its normal stress strength
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