Transient thermal fracture investigation of a cracked functionally graded layer via Guyer-Krumhansl model

• Published in: Engineering fracture mechanics 2024-10, Vol.309, p.110407, Article 110407
• Main Authors: Yang, Wenzhi, Gao, Ruchao, Cui, Yi, Chen, Zengtao
• Format: Article
• Language: English
• Subjects: Functionally graded material; Guyer-Krumhansl model; Integral transform; Singular integral equation; Stress intensity factor
• ISSN: 0013-7944
• DOI: 10.1016/j.engfracmech.2024.110407

•The functionally graded layer with a central crack is considered.•The Guyer-Krumhansl model is employed to analyze the unclassical thermoelastic responses.•The effects of thermal lagging time and nonlocal length on the transient thermoelastic responses are examined. Recent experimental evidence proves the Guyer-Krumhansl (G-K) model’s capability of predicting the nonclassical transient heat transfer process in heterogeneous composites. The objective of this article is to explore the dynamic thermal and fracture behaviors of a cracked orthotropic functionally graded material (FGM) layer subject to abrupt thermal shocks via the G-K equation. The thermal and elastic governing equations determined by the G-K model are transformed into the singular integral equations, which are calculated numerically to assess the non-Fourier transient temperatures and the resultant dynamic thermal stress intensity factors. Parametric comparisons are carried out for the effects of the non-Fourier thermal lagging time and thermal nonlocal length on the transient thermoelastic responses. The findings would benefit the applications of unconventional heat conduction theories and shed light on the scientific understanding of FGM’s fracture behaviors.