Determining Crack Initiation Fracture Toughness and Crack Initiation Length Using Ae and Dic Approach for Hdpe Materials

28 Pages Posted: 6 Jan 2025

See all articles by Yue Zhang

Yue Zhang

Shijiazhuang Tiedao University

Sixiang Liang

Shijiazhuang Tiedao University

Wenjie Feng

Shijiazhuang Tiedao University

Jingbo Duan

Shijiazhuang Tiedao University

Abstract

Fracture toughness JIC is a crucial indicator for characterizing the ability of materials to prevent crack propagation. For high density polyethylene (HDPE), multi-specimen method is generally adopted to construct crack resistance (J-R) curve following ASTM D6068. The polymer community has suggested J0.2 at 0.2 mm of crack growth from J-R curve as crack-initiation toughness, while the dilemma is still faced in experimentally observing crack initiation. This paper attempts to develop a single-specimen method to measure JIC, as well as crack initiation length. The method requires acoustic emission (AE) technique to determine crack initiation, and digital image correlation (DIC) technique to provide displacement and strain information for J-integral calculation. The accuracy of JIC was validated by comparison of J0.2 and FE simulation. Average crack initiation length was evaluated by inverting JIC on J-R curve. Research results show that, within loading rate from 0.1 mm/min to 3.0 mm/min, crack initiation length decreases from 0.1965 mm to 0.1932 mm, and JIC shows slightly decreasing tendency while J0.2 varies oppositely, therefore, using 0.2 mm extension as crack initiation will overestimate fracture toughness at higher loading speed. When the variation of loading rate is not significant, JIC can be approximated as constant as 19.9 kJ/m2.

Keywords: Fracture toughness, crack initiation length, J-integral, acoustic emission, Digital image correlation, J-R curve

Suggested Citation

Zhang, Yue and Liang, Sixiang and Feng, Wenjie and Duan, Jingbo, Determining Crack Initiation Fracture Toughness and Crack Initiation Length Using Ae and Dic Approach for Hdpe Materials. Available at SSRN: https://ssrn.com/abstract=5084739 or http://dx.doi.org/10.2139/ssrn.5084739

Yue Zhang

Shijiazhuang Tiedao University ( email )

China

Sixiang Liang

Shijiazhuang Tiedao University ( email )

China

Wenjie Feng (Contact Author)

Shijiazhuang Tiedao University ( email )

China

Jingbo Duan

Shijiazhuang Tiedao University ( email )

China

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
13
Abstract Views
159
PlumX Metrics