Investigation on brittle-ductile transition of PMMA mode-II fracture using time-temperature superposition principle. (1st October 2022)

• Record Type: Journal Article
• Authors: Yao, Chengbin; Xia, Yan; Zhu, Zhongmeng; Yang, Zhuoran; Chen, Kang; Jiang, Han
• Is Part Of: Engineering fracture mechanics. Volume 273(2022)
• Publication Date: 2022-10-01
• Subjects: Mode-II fracture -- Brittle-ductile transition -- Time-temperature superposition principle -- PMMA; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2022.108733
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Time-temperature superposition approach is utilized to investigate PMMA mode-II fracture. Critical brittle-ductile transition (BDT) rates/temperatures are predicted by KJC / KIIC master curves. The BDT state of shear fracture under complex condition can be predicted from limited test conditions. Abstract: The rate-temperature dependent brittle-ductile transition (BDT) behavior of PMMA (polymethyl methacrylate) mode-II fracture was investigated through tensile-loading shear fracture (TLSF) tests. The dimensionless ratio KJC /KIIC was chosen as the index to identify the brittle/ductile state. Assuming the fracture property to be viscosity-dominated, the time-temperature superposition principle based on the Arrhenius equation was adopted. The master curves of KJC /KIIC in a wide range of loading rate and temperature were constructed with the experimental data obtained under limited test conditions. With the derived critical BDT band from the master curve, the BDT state of PMMA's fracture under complex loading conditions was successfully predicted and experimentally validated. The results are helpful to describe the BDT behavior and provide an equivalent approach to investigate the mode-II fracture which can substantially save the experimental cost and time.