Crack layer (CL) theory has the advantage of capturing the physics of slow crack growth (SCG) and simulating various scenarios of SCG in thermoplastics. However, lack of knowledge regarding the dependency of CL input parameters on loading conditions and time limits the use of CL theory in predicting the lifespan of materials subject to brittle fracture. In this study, CL theory with variable average process zone (PZ) boundary traction (σclose) and characteristic time for PZ degradation (t∗) is applied to fatigue tests with various loading conditions in order to observe discontinuous SCG. Using simulations, experimental results are achieved by changing two CL parameters, thereby establishing these two parameters as the key factors affecting SCG for various types of applied loads. In addition, the specific relationships between these two parameters and fatigue loading conditions are obtained. These obtained relationships may be beneficial for practical use of CL theory to estimate the SCG processes as well as their lifespan under various fatigue conditions.
Bibliographical noteFunding Information:
This work was supported by the Nuclear Research and Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Ministry of Trade, Industry and Energy of Korea (No. 20141510101640 ). The authors also would like to thank for financial supports from Korea University .
- Crack layer theory
- High density polyethylene
- Slow crack growth
ASJC Scopus subject areas
- Modelling and Simulation
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering